OA19598A - Composition and threaded joint for pipes provided with lubricating coating film layer that is formed from said composition. - Google Patents
Composition and threaded joint for pipes provided with lubricating coating film layer that is formed from said composition. Download PDFInfo
- Publication number
- OA19598A OA19598A OA1202000140 OA19598A OA 19598 A OA19598 A OA 19598A OA 1202000140 OA1202000140 OA 1202000140 OA 19598 A OA19598 A OA 19598A
- Authority
- OA
- OAPI
- Prior art keywords
- composition
- coating layer
- pipes
- métal
- tubes
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 169
- 239000011248 coating agent Substances 0.000 title claims description 47
- 238000000576 coating method Methods 0.000 title claims description 47
- 230000001050 lubricating Effects 0.000 title description 2
- 239000000314 lubricant Substances 0.000 claims abstract description 178
- 239000011247 coating layer Substances 0.000 claims abstract description 142
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000010410 layer Substances 0.000 claims abstract description 61
- -1 basic metal salt Chemical class 0.000 claims abstract description 49
- 239000000344 soap Substances 0.000 claims abstract description 25
- 238000007747 plating Methods 0.000 claims description 79
- 239000000126 substance Substances 0.000 claims description 52
- 238000006243 chemical reaction Methods 0.000 claims description 42
- 239000000843 powder Substances 0.000 claims description 41
- 239000003960 organic solvent Substances 0.000 claims description 16
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 14
- 238000005422 blasting Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910002804 graphite Inorganic materials 0.000 claims description 11
- 239000010439 graphite Substances 0.000 claims description 11
- 238000005554 pickling Methods 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 239000011780 sodium chloride Substances 0.000 abstract description 3
- 229910052728 basic metal Inorganic materials 0.000 abstract 1
- 239000001993 wax Substances 0.000 description 44
- 238000000227 grinding Methods 0.000 description 30
- 239000011575 calcium Substances 0.000 description 28
- 239000010452 phosphate Substances 0.000 description 25
- 238000005507 spraying Methods 0.000 description 25
- NBIIXXVUZAFLBC-UHFFFAOYSA-K [O-]P([O-])([O-])=O Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 24
- LPXPTNMVRIOKMN-UHFFFAOYSA-M Sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 22
- LRXTYHSAJDENHV-UHFFFAOYSA-H Zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 22
- 229910000165 zinc phosphate Inorganic materials 0.000 description 22
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- 229910045601 alloy Inorganic materials 0.000 description 19
- 239000000956 alloy Substances 0.000 description 19
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 19
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 17
- 239000000243 solution Substances 0.000 description 17
- 239000002585 base Substances 0.000 description 16
- 235000019271 petrolatum Nutrition 0.000 description 16
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Inorganic materials [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 16
- LSNNMFCWUKXFEE-UHFFFAOYSA-L Sulphite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 15
- 239000000654 additive Substances 0.000 description 15
- 238000009713 electroplating Methods 0.000 description 15
- 239000002904 solvent Substances 0.000 description 15
- 239000012188 paraffin wax Substances 0.000 description 14
- 150000001875 compounds Chemical class 0.000 description 13
- 239000010949 copper Substances 0.000 description 13
- 239000002245 particle Substances 0.000 description 13
- WUKWITHWXAAZEY-UHFFFAOYSA-L Calcium fluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 12
- 238000001816 cooling Methods 0.000 description 12
- 238000005755 formation reaction Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 239000004519 grease Substances 0.000 description 11
- 230000000996 additive Effects 0.000 description 10
- 230000001808 coupling Effects 0.000 description 10
- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
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- 235000014113 dietary fatty acids Nutrition 0.000 description 9
- 239000000194 fatty acid Substances 0.000 description 9
- 150000004665 fatty acids Chemical class 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- 230000003746 surface roughness Effects 0.000 description 9
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- 229910007614 Zn—Ni Inorganic materials 0.000 description 8
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- 239000011651 chromium Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000003513 alkali Substances 0.000 description 7
- 229910001634 calcium fluoride Inorganic materials 0.000 description 7
- 230000005484 gravity Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- 235000019198 oils Nutrition 0.000 description 7
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 7
- QIQXTHQIDYTFRH-UHFFFAOYSA-N Stearic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000523 sample Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 229940056345 Tums Drugs 0.000 description 5
- 229910001297 Zn alloy Inorganic materials 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- UKMSUNONTOPOIO-UHFFFAOYSA-N Behenic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 4
- DPUOLQHDNGRHBS-KTKRTIGZSA-N Erucic acid Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(O)=O DPUOLQHDNGRHBS-KTKRTIGZSA-N 0.000 description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N Lauric acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 4
- QZZGJDVWLFXDLK-UHFFFAOYSA-N Lignoceric acid Chemical compound CCCCCCCCCCCCCCCCCCCCCCCC(O)=O QZZGJDVWLFXDLK-UHFFFAOYSA-N 0.000 description 4
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Chemical compound CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 4
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N Oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N Palmitic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 4
- YGSDEFSMJLZEOE-UHFFFAOYSA-N Salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 4
- 229910052788 barium Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 229910017755 Cu-Sn Inorganic materials 0.000 description 3
- 229910017927 Cu—Sn Inorganic materials 0.000 description 3
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 3
- 150000001342 alkaline earth metals Chemical class 0.000 description 3
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium(0) Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000001747 exhibiting Effects 0.000 description 3
- 235000019197 fats Nutrition 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 239000011133 lead Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000004200 microcrystalline wax Substances 0.000 description 3
- 235000019808 microcrystalline wax Nutrition 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000006011 modification reaction Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 235000019809 paraffin wax Nutrition 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 229960001860 salicylate Drugs 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- PTFCDOFLOPIGGS-UHFFFAOYSA-N zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 3
- WCOXQTXVACYMLM-UHFFFAOYSA-N 2,3-bis(12-hydroxyoctadecanoyloxy)propyl 12-hydroxyoctadecanoate Chemical compound CCCCCCC(O)CCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCC(O)CCCCCC)COC(=O)CCCCCCCCCCC(O)CCCCCC WCOXQTXVACYMLM-UHFFFAOYSA-N 0.000 description 2
- VKOBVWXKNCXXDE-UHFFFAOYSA-N Arachidic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- 235000021357 Behenic acid Nutrition 0.000 description 2
- UJZJSFZBAKDUFC-UHFFFAOYSA-N Bismuth sulfide Chemical compound [S-2].[S-2].[S-2].[BiH3+3].[BiH3+3] UJZJSFZBAKDUFC-UHFFFAOYSA-N 0.000 description 2
- 229940073532 Candelilla Wax Drugs 0.000 description 2
- ZQPPMHVWECSIRJ-MDZDMXLPSA-N Elaidic acid Chemical compound CCCCCCCC\C=C\CCCCCCCC(O)=O ZQPPMHVWECSIRJ-MDZDMXLPSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N HF Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- IUJAMGNYPWYUPM-UHFFFAOYSA-N Hentriacontane Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC IUJAMGNYPWYUPM-UHFFFAOYSA-N 0.000 description 2
- 239000005639 Lauric acid Substances 0.000 description 2
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- CWQXQMHSOZUFJS-UHFFFAOYSA-N Molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 2
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- PZNSFCLAULLKQX-UHFFFAOYSA-N N#B Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 239000005642 Oleic acid Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 235000019482 Palm oil Nutrition 0.000 description 2
- 235000021314 Palmitic acid Nutrition 0.000 description 2
- 239000004264 Petrolatum Substances 0.000 description 2
- 229940066842 Petrolatum Drugs 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004698 Polyethylene (PE) Substances 0.000 description 2
- 235000019484 Rapeseed oil Nutrition 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 229910020994 Sn-Zn Inorganic materials 0.000 description 2
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
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- SZHOJFHSIKHZHA-UHFFFAOYSA-N Tridecylic acid Chemical compound CCCCCCCCCCCCC(O)=O SZHOJFHSIKHZHA-UHFFFAOYSA-N 0.000 description 2
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N Tungsten(IV) sulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 2
- 210000002268 Wool Anatomy 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- HJJOHHHEKFECQI-UHFFFAOYSA-N aluminum;phosphite Chemical compound [Al+3].[O-]P([O-])[O-] HJJOHHHEKFECQI-UHFFFAOYSA-N 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
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- 125000003118 aryl group Chemical group 0.000 description 2
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- JOSWYUNQBRPBDN-UHFFFAOYSA-P Ammonium dichromate Chemical compound [NH4+].[NH4+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O JOSWYUNQBRPBDN-UHFFFAOYSA-P 0.000 description 1
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- ZQKXQUJXLSSJCH-UHFFFAOYSA-N Melamine cyanurate Chemical compound NC1=NC(N)=NC(N)=N1.O=C1NC(=O)NC(=O)N1 ZQKXQUJXLSSJCH-UHFFFAOYSA-N 0.000 description 1
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- 238000007598 dipping method Methods 0.000 description 1
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- 238000004898 kneading Methods 0.000 description 1
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- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical compound C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 description 1
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- 230000001264 neutralization Effects 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N o-xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical group 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229960003629 potassium salicylate Drugs 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910052904 quartz Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 150000003873 salicylate salts Chemical class 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- NESLWCLHZZISNB-UHFFFAOYSA-M sodium phenolate Chemical compound [Na+].[O-]C1=CC=CC=C1 NESLWCLHZZISNB-UHFFFAOYSA-M 0.000 description 1
- 229960004025 sodium salicylate Drugs 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 235000019385 spermaceti wax Nutrition 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 150000003871 sulfonates Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 150000004764 thiosulfuric acid derivatives Chemical class 0.000 description 1
- 229910001432 tin ion Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 230000021037 unidirectional conjugation Effects 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Abstract
This invention provides a composition, and a threaded connection for pipes or tubes (1) that includes a lubricant coating layer (21) formed from the composition. The composition according to the present embodiment is a composition for forming a lubricant coating layer (21) on a threaded connection for pipes or tubes (1), and contains Cr203, a metal soap, a wax and a basic metal salt of an aromatic organic acid. The threaded connection for pipes or tubes (1) according to the present embodiment includes a pin (5) and a box (8). The pin (5) and the box (8) each include a contact surface including a threaded portion (4), (7) and an unthreaded metal contact portion. The threaded connection for pipes or tubes (1) includes, as an outermost layer, a lubricant coating layer (21) formed from the aforementioned composition on at least one of the contact surfaces of the pin (5) and the box (8).
Description
DESCRIPTION
TITLE OF INVENTION
COMPOSITION, AND THREADED JOINT FOR PIPES PROVIDED WITH LUBRICATING COATING FILM THAT IS FORMED FROM SAID COMPOSITION
TECHNICAL FIELD
The présent invention relates to a composition, in particular a composition for forming a lubricant coating layer to be used in a threaded connection for oil country tubular goods, and also relates to a threaded connection for pipes or tubes that includes a lubricant coating layer formed from the composition.
BACKGROUND ART
Oil well pipes are used for drilling of oil fields and natural gas fields. Oil well pipes are formed by coupling a plurality of steel pipes in accordance with the depth of the well. Connection of steel pipes can be carried out by fastening threaded connection for pipes or tubes formed at ends of the two steel pipes. When trouble occurs during the course of operations until an oil well is completed or after completion of an oil well, oil country tubular goods may be repeatedly lifted and loosened to inspect the thread faces and the like thereof, and thereafter refastened and lowered for re-use.
The threaded connection for pipes or tubes includes a pin and a box. The pin includes a male threaded portion formed in the outer peripheral surface at the end of the pipe. The box
-2includes a female threaded portion formed in the inner peripheral surface at the end of the pipe. The pin and the box may also include an unthreaded métal contact portion. The threaded portions and unthreaded métal contact portions of the pin and the box repeatedly expérience strong friction during fastening and loosening of the pipes. If these portions are not sufficiently résistant to friction, galling (unrepairable seizure) will occur during repeated fastening and loosening. Thus, it is necessary that threaded connection for pipes or tubes hâve sufficient résistance to friction, i.e., excellent galling résistance.
Heretofore, heavy metal-containing compound greases, referred to as dopes, hâve been used to improve the galling résistance. Application of a compound grease to the surface of a threaded connection for pipes or tubes can improve the galling résistance of the threaded connection for pipes or tubes. However, heavy metals contained in compound greases, such as Pb, Zn, and Cu, may affect the environment. For this reason, the development of a composition for forming a lubricant coating layer to be used in a threaded connection for pipes or tubes which does not use a compound grease is desired.
International Application Publication No. WO2009/057754 (Patent Literature 1) and International Application Publication No. WO2014/024755 (Patent Literature 2) propose a lubricant coating layer excellent in galling résistance even without using a compound grease, and a composition for forming a lubricant coating layer.
The lubricant coating layer described in Patent Literature 1 includes one of or both of
- 3 rosin and calcium fluoride, and a métal soap, a wax and a basic métal sait of an aromatic organic acid. It is described in Patent Literature l that, as a resuit, the lubricant coating layer is excellent in anti-galling, gas tightness and anti-rust properties.
A composition for forming a lubricant coating layer on a tube-like threaded connection described in Patent Literature 2 contains melamine cyanurate and a basic métal sait of an aromatic organic acid, and one or more types selected from the group consisting of a pine resinbased material, a wax, a métal soap and a lubricant powder. It is described in Patent Literature 2 that, as a resuit, the obtained lubricant coating layer is excellent in anti-galling, gas tightness and anti-rust properties.
CITATION LIST
PATENT LITERATURE
Patent Literature l : International Application Publication No. WO2009/057754
Patent Literature 2: International Application Publication No. WO2014/024755
SUMMARY OF INVENTION
TECHNICAL PROBLEM
In this connection, the threaded portions and unthreaded métal contact portions of the pin and box include métal seal portions and shoulder portions. During fastening of a threaded connection for pipes or tubes that has an unthreaded métal contact portion, the shoulder portions of the pin and box corne in contact with each other. Torque that arises at that time is called
-4shouldering torque. During fastening of a threaded connection for pipes or tubes, after the shouldering torque is reached, fastening is continued until fastening is completed. By this means, the gas tightness of the threaded connection for pipes or tubes is enhanced. If fastening proceeds further, métal constituting at least one of the pin and the box starts to undergo a plastic deformation. The torque at such time is referred to as yield torque.
The torque when fastening is completed (hereunder, referred to as fastening torque) is set so that a sufficient seal interfacial pressure is obtained irrespective of the size of the thread interférence amount. If there is a sufficient différence between the shouldering torque and the yield torque (hereunder, this différence is referred to as torque on shoulder résistance ΔΤ'), the range of the fastening torque widens. As a resuit, the fastening torque is adjusted easily. Therefore, it is necessary that a threaded connection for pipes or tubes has both the aforementioned galling résistance and a high torque on shoulder résistance ΔΤ', that is, high over-torque performance. This similarly applies with respect to a threaded connection for pipes or tubes which does not hâve an unthreaded métal contact portion (particularly, a shoulder portion). Even when a threaded connection for pipes or tubes does not hâve a shoulder portion, if high torque is maintained at a time of high interfacial pressure, it will be easy to adjust the fastening torque.
An objective of the présent invention is to provide a composition for obtaining a threaded connection for pipes or tubes having excellent galling résistance and high over-torque performance, and also a threaded connection for pipes or tubes which includes a lubricant
- 5 coating layer formed from the composition and which has excellent galling résistance and high over-torque performance.
SOLUTION TO PROBLEM
The composition according to the présent embodiment is a composition for forming a lubricant coating layer on a threaded connection for pipes or tubes, the composition containing Cr2O3, a métal soap, a wax and a basic métal sait of an aromatic organic acid.
The threaded connection for pipes or tubes according to the présent embodiment is a threaded connection that is for pipes or tubes and that includes a pin and a box. The pin and the box each include a contact surface that includes a threaded portion and an unthreaded métal contact portion. The threaded connection for pipes or tubes includes, as an outermost layer, a lubricant coating layer that is formed from the aforementioned composition on at least one of the contact surfaces of the pin and the box.
ADVANTAGEOUS EFFECTS OF INVENTION
A threaded connection for pipes or tubes according to the présent embodiment includes a lubricant coating layer. A composition for forming the aforementioned lubricant coating layer contains Cr2O3. Therefore, the threaded connection for pipes or tubes according to the présent embodiment exhibits excellent galling résistance even when fastening is repeated. In addition, the threaded connection for pipes or tubes according to the présent embodiment exhibits high over-torque performance.
- 6 BRIEF DESCRIPTION OF DRAWINGS
[FIG. I] FIG. I is a graph illustrating the relation between the number of tums of a threaded connection for pipes or tubes that has a shoulder portion and the torque.
[FIG. 2] FIG. 2 is a graph illustrating the relation between the Cr2O3 content in a composition for forming a lubricant coating layer and over-torque performance.
[FIG. 3] FIG. 3 is a graph illustrating the relation between the Cr2O3 content in a composition for forming a lubricant coating layer and galling résistance.
[FIG. 4] FIG. 4 is a diagram illustrating a configuration of a threaded connection for pipes or tubes according to the présent embodiment.
[FIG. 5] FIG. 5 is a cross-sectional view of the threaded connection for pipes or tubes according to the présent embodiment.
[FIG. 6] FIG. 6 is a cross-sectional view of a contact surface of the threaded connection for pipes or tubes according to the présent embodiment.
[FIG. 7] FIG. 7 is a graph for describing torque on shoulder résistance ΔΤ' in an example.
DESCRIPTION OF EMBODIMENTS
The présent embodiment will be described in detail below with reference to the drawings. The same reference symbols will be used throughout the drawings to refer to the same or like parts, and description thereof will not be repeated.
The présent inventors conducted various studies regarding the relation between a composition for forming a lubricant coating layer for a threaded connection for pipes or tubes, a
-7 threaded connection for pipes or tubes, and galling résistance and over-torque performance. As a resuit, the présent inventors obtained the following findings.
[Over-torque Performance]
During fastening of Steel pipes to each other, the optimal torque to end the fastening is detennined in advance. FIG. 1 is a graph illustrating the relation between the number of turns of threaded connections for pipes or tubes and the torque during fastening of threaded connections for pipes or tubes that hâve a shoulder portion. Referring to FIG. 1, fastening of the threaded connections for pipes or tubes initially increases the torque in proportion to the number of tums. The rate of increase in the torque at such time is low. As fastening continues, the shoulder portions corne in contact with each other. The torque at such time is referred to as shouldering torque. After the shouldering torque is reached, when fastening is continued, the torque again increases in proportion to the number of tums. The rate of increase in the torque at such time is high. The fastening is completed at a time point at which the torque reaches a predetermined numerical value (fastening torque). If the torque during fastening reaches the fastening torque, the métal seal portions interfère with each other with an appropriate interfacial pressure. In this case, the gas tightness of the threaded connections for pipes or tubes increases.
If fastening is further continued after the fastening torque is reached, the torque becomes too high. If the torque becomes too high, a part of the pin and the box undergoes a plastic deformation. The torque at such time is referred to as yield torque. When the torque on shoulder résistance ΔΤ' which is the différence between the shouldering torque and the yield
- 8 torque is large, a margin can be provided with respect to the range of the fastening torque. As a resuit, it is easy to adjust the fastening torque. Therefore, a higher value for the torque on shoulder résistance AT' is préférable. In the présent description, the term over-torque performance is high means the torque on shoulder résistance ΔΤ' is high.
In order to raise the torque on shoulder résistance AT', it is effective to decrease the shouldering torque or to increase the yield torque. Therefore, it is considered that causing hard particles to be contained in a composition for forming a lubricant coating layer (hereinafter, also referred to simply as composition) will increase the yield torque at a time of high interfacial pressure. As a resuit, it is considered that the torque on shoulder résistance AT' will increase.
However, as the resuit of investigations and studies conducted by the présent inventors, the présent inventors found that even though hard particles were simply contained in a composition, a high torque on shoulder résistance AT' was not obtained. For example, although CaF2 is a hard particle, as shown in an example described later, a high torque on shoulder résistance ΔΤ' could not be obtained when using CaF2.
Therefore, the présent inventors conducted fùrther studies of various kinds and discovered that a high torque on shoulder résistance ΔΤ' is obtained by containing Cr2O3 in a composition.
FIG. 2 is a graph illustrating the relation between the Cr2Û3 content in a composition and over-torque performance. FIG. 2 was obtained by means of an example that is described later.
-9Note that, the over-torque performance was determined as a relative value with respect to the torque on shoulder résistance ΔΤ of Test No. 8 where a dope according to the API (American Petroleum Institute) standards is used instead of a lubricant coating layer is taken as a reference (100). The symbol of white circle O in FIG. 2 dénotés the over-torque performance for an example in which a lubricant coating layer was formed. The symbol of white triangle in FIG. 2 dénotés the over-torque performance when the dope according to the API standards was used instead of a lubricant coating layer.
Based on FIG. 2, it is shown that when C^Oj is contained, the over-torque performance is more than 100. In other words, when C^Cb is contained, high over-torque performance is obtained.
[Galling Résistance]
The présent inventors further discovered that, by causing a suitable amount of Cr2O3 to be contained in the composition, the galling résistance also increases, and not just the over-torque performance.
FIG. 3 is a graph illustrating the relation between the Cr2O3 content in a composition and the galling résistance. FIG. 3 was obtained by means of an example described later. The ordinate in FIG. 3 represents the number of times of fastening completed without the occurrence of either of unrepairable galling at a threaded portion and galling at a métal seal portion.
- ΙΟFIG. 3 shows that, when a suitable amount of Cr2O3 is contained in the composition, the number of times fastening can be performed is more than 10 times. In other words, when a suitable amount of Cr2O3 is contained in the composition, high galling résistance is obtained.
A composition according to the présent embodiment completed based on the above fmdings is a composition for forming a lubricant coating layer in a threaded connection for pipes or tubes, the composition containing Cr2O3, a métal soap, a wax and a basic métal sait of an aromatic organic acid.
In the composition according to the présent embodiment, in mass percent based on the total amount of non-volatile components, preferably the Cr2O3 content is from 1 to 20%, the métal soap content is from 2 to 30%, the wax content is from 2 to 30%, and the basic métal sait of the aromatic organic acid content is from 20 to 70%.
In this case, the over-torque performance and galling résistance further increase.
The composition according to the présent embodiment may also contain a lubricant powder.
In a case where the composition according to the présent embodiment contains a lubricant powder, in mass percent based on the total amount of non-volatile components, the lubricant powder content is preferably from 0.5 to 20%.
- H Preferably, the aforementioned lubricant powder is one or more types selected from a group consisting of graphite and polytetrafluoroethylene.
The composition according to the présent embodiment may also contain a volatile organic solvent.
A threaded connection for pipes or tubes according to the présent embodiment is a threaded connection that is for pipes or tubes and that includes a pin and a box. The pin and the box each include a contact surface that includes a threaded portion and an unthreaded métal contact portion. The threaded connection for pipes or tubes includes, as an outermost layer, a lubricant coating layer that is formed from the aforementioned composition on at least one of the contact surfaces of the pin and the box.
The threaded connection for pipes or tubes according to the présent embodiment may include a métal plating layer between at least one of the contact surfaces of the pin and the box, and the lubricant coating layer.
The threaded connection for pipes or tubes according to the présent embodiment may include, below the lubricant coating layer, a Chemical conversion treatment coating having a surface that contacts the lubricant coating layer.
- 12 In the threaded connection for pipes or tubes according to the présent embodiment, a surface that contacts the lubricant coating layer may be subjected to a blasting treatment. Further, in the threaded connection for pipes or tubes according to the présent embodiment, a surface that contacts the lubricant coating layer may be subjected to pickling.
In the threaded connection for pipes or tubes according to the présent embodiment, the contact surface may further include an unthreaded métal contact portion.
Hereunder, the composition, and the threaded connection for pipes or tubes including a lubricant coating layer formed from the composition according to the présent embodiment will be described in detail.
[Threaded connection 1 for pipes or tubes]
The threaded connection 1 for pipes or tubes includes a pin 5 and a box 8. FIG. 4 is a diagram illustrating a configuration of the threaded connection for pipes or tubes according to the présent embodiment. A threaded connection 1 for pipes or tubes includes a Steel pipe 2 and a coupling 3. The pin 5 is formed at each end of the Steel pipe 2 and the pin 5 includes a male threaded portion 4 in its outer surface. The box 8 is formed at each end of the coupling 3 and the box 8 includes a female threaded portion 7 in its inner surface. By fastening the pin 5 and box 8 together, the coupling 3 is attached to the end of the Steel pipe 2. Although not illustrated in the drawings, a pin 5 of the Steel pipe 2 and a box 8 of the coupling 3 that are not coupled to a mating member may hâve a protector (not illustrated) attached thereto for protecting their
- 13 threaded portions.
A typical threaded connection l for pipes or tubes is of the coupling type like the one illustrated in FIG. 4, which includes the Steel pipe 2 and the coupling 3. Also known is a threaded connection 1 for pipes or tubes of the intégral type, in which one end of a Steel pipe 2 is in the form of a pin 5 and the other end thereof is in the form of a box 8, with no coupling used. The threaded connection 1 for pipes or tubes of the présent embodiment may be employed either as a coupling type threaded connection or as an intégral type threaded connection.
The pin 5 and the box 8 include a contact surface that includes a threaded portion and an unthreaded métal contact portion. FIG. 5 is a cross-sectional view of the threaded connection 1 for pipes or tubes according to the présent embodiment. The pin 5 includes the male threaded portion 4 and the unthreaded métal contact portion. The unthreaded métal contact portion of the pin 5 is formed at the tip end of the pin 5 and includes a métal seal portion 10 and a shoulder portion 11. The box 8 includes the female threaded portion 7 and the métal contact portion. The unthreaded métal contact portion of the box 8 is formed at the tip end of the box 8 and includes a métal seal portion 13 and a shoulder portion 12. The portion at which the pin 5 and the box 8 corne into contact with each other when they are fastened together is referred to as the contact surface. Specifically, when the pin 5 and the box 8 hâve been fastened to each other, the two shoulder portions (shoulder portions 11 and 12) corne into contact with each other, and so do the two métal seal portions (métal seal portions 10 and 13) and the two threaded portions (male threaded portion 4 and female threaded portion 7). That is, the contact surface includes the shoulder portion, the métal seal portion and the threaded portion.
Although not illustrated in the drawings, in some cases a contact surface of the threaded connection 1 for pipes or tubes may not hâve an unthreaded métal contact portion. In such a case, the contact surface of the threaded connection 1 for pipes or tubes includes a threaded portion. Specifically, the pin 5 includes the male threaded portion 4. The box 8 includes the female threaded portion 7.
[Lubricant Coating Layer 21]
In the threaded connection 1 for pipes or tubes, at least one of the pin 5 and box 8 includes a lubricant coating layer 21 on its contact surface. FIG. 6 is a cross-sectional view of a contact surface of the threaded connection 1 for pipes or tubes according to the présent embodiment. A lubricant coating layer 21 is formed by, as described in a production method that is mentioned later, applying a composition for forming the lubricant coating layer 21 to at least one of the contact surfaces of the pin 5 and the box 8, and drying the composition.
[Composition for Forming Lubricant Coating Layer 21]
The composition for forming the lubricant coating layer 21 contains Cr2O3, a métal soap, a wax and a basic métal sait of an aromatic organic acid. Therefore, the lubricant coating layer 21 also contains Cr2Û3, a métal soap, a wax and a basic métal sait of an aromatic organic acid. The composition may either be a composition of a solventless type (i.e., including the abovedescribed components only) or be a composition of a solvent type in which the components are
- 15 dissolved in a solvent. In the case of a composition of a solvent type, the mass percentage of each component refers to a mass percentage of the component relative to the total amount of non-volatile components in the composition (the total mass of ail components excluding the solvent contained in the composition) as being 100%. That is, the content of each component in the composition and the content of each component in the lubricant coating layer 21 are equal to each other.
Hereunder, each component in the composition will be described in detail. Unless specifically stated otherwise, the Symbol % in relation to each component means mass percent based on a total amount of non-volatile components in the composition. In the présent embodiment the term non-volatile components means ail components other than a solvent that are contained in the composition. The term non-volatile components refers to, for example, Cr?O3, a métal soap, a wax and a basic métal sait of an aromatic organic acid. The respective components can each be independently selected, and a selected combination does not produce any new effect.
[Cr2O3]
Cr2O3 is also referred to as chromium oxide (III). Cr2O3 is an inorganic compound. The formula weight of Cr2O3 is 151.99. Cr2O3 is obtained by thermal décomposition of ammonium dichromate (ammonium bichromate). Cr2O2 becomes a dark-green crystal with a metallic luster by sublimation and purification. Cr2O3 is very stable, and is harder than quartz. Cr2O3 does not hâve toxicity and is not hazardous.
As described above, if Cr2O3 is contained in the composition, the over-torque performance increases. Further, if Cr2O3 is contained in the composition, the galling résistance also increases.
The Cr2O3 content in the lubricant coating layer 21 is preferably from 1 to 20% in mass percent based on the total amount of non-volatile components in the composition. When the Cr2O3 content is 1% or more, sufficient over-torque performance is obtained. When the Cr2O3 content is not more than 20%, a décliné in the strength of the coating can be suppressed. Furthermore, if the Cr2O3 content is not more than 20%, an increase in friction is suppressed, and high galling résistance can be maintained. The lower limit of the Cr2O3 content is more preferably 5 mass%, further preferably is 7 mass%, and further preferably is 10 mass%. The upper limit of the Cr2O3 content is more preferably 18 mass%, and further preferably is 15 mass%.
Cr2O3, for example, is a dark green particle. A préférable particle size of Cr2O3 is 45 pm or less. From the viewpoint of uniform dispersibility, a particle size of 10 pm or less is more préférable. The particle size is the arithmetic mean value of an effective particle size distribution obtained by particle size distribution measurement performed by a laser diffraction and scattering method (for example, using the SALD sériés manufactured by SHIMADZU).
The Cr2O3 is, for example, chromium oxide (III) manufactured by Wako Pure Chemical
Industries, Ltd.
[Metal Soap]
A métal soap is a sait of a fatty acid with a métal other than an alkali métal. By containing a métal soap, the galling résistance and anti-rust properties of the lubricant coating layer 21 improve.
From the viewpoint of lubricity and anti-rust properties, it is préférable that the fatty acid of the métal soap be a fatty acid having 12 to 30 carbon atoms. The fatty acid may be either a saturated fatty acid or an unsaturated fatty acid. The fatty acid is a mixed fatty acid or a single compound. The mixed fatty acid, for example, is derived from natural fat and oil such as beef tallow, lard, wool fat, palm oil, rapeseed oil, and coconut oil. The fatty acid that is a single compound is, for example, lauric acid, tridecylic acid, myristic acid, palmitic acid, lanopalmitic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, arachic acid, behenic acid, erucic acid, lignoceric acid, lanoceric acid, sulfonic acid, salicylic acid, and carboxylic acid.
Examples of the métal of the métal soap include calcium, alkaline earth metals and zinc. A calcium sait is préférable as the type of métal sait. The sait may be either a neutral sait or a basic sait.
That is, the métal soap includes, for example, a sait of one or more types of fatty acid selected from a group consisting of beef tallow, lard, wool fat, palm oil, rapeseed oil, coconut oil, lauric acid, tridecylic acid, myristic acid, palmitic acid, lanopalmitic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, arachic acid, behenic acid, erucic acid, lignoceric acid, lanoceric
- 18acid, sulfonic acid, salicylic acid and carboxylic acid with one or more types of métal selected from a group consisting of calcium, alkaline earth metals and zinc.
The content of the métal soap in the composition is preferably from 2 to 30% in mass percent based on the total amount of non-volatile components in the composition. When the content of the métal soap is 2% or more, the galling résistance and anti-rust properties of the lubricant coating layer 21 can be sufficiently enhanced. When the content is not more than 30%, the necessary adhesion properties and strength of the lubricant coating layer 21 are sufficiently obtained. A fùrther préférable lower limit of the content of the métal soap is 4%, and more preferably is 10%. A fùrther préférable upper limit of the content of the métal soap is 19%, and more preferably is 17%.
[Wax]
The tenu wax refers to an organic substance which is solid at normal température and becomes liquid when heated. The wax is one or more types selected from a group consisting of animal wax, vegetable wax, minerai wax, and synthetic wax. Examples of the animal wax include beeswax and spermaceti wax. Examples of the vegetable wax include Japan wax, camauba wax, candelilla wax and rice wax. Examples of the minerai wax include paraffin wax, microcrystalline wax, petrolatum, montan wax, ozocerite and ceresin. Examples ofthe synthetic wax include oxidized wax, polyethylene wax, Fischer-Tropsch wax, amide wax and hydrogenated castor oil (castor wax). Preferably, the wax is paraffin wax having a molecular weight of 150 to 500.
- 19That is, the wax is, for example, one or more types of wax selected from a group consisting of beeswax, spennaceti wax, Japan wax, camauba wax, candelilla wax, rice wax, paraffin wax, microcrystalline wax, petrolatum, montan wax, ozocerite, ceresin, oxidized wax, polyethylene wax, Fischer-Tropsch wax, amide wax and hydrogenated castor oil (castor wax).
Preferably, the wax is one or more types of wax selected from a group consisting of paraffin wax, microcrystalline wax and oxidized wax.
The wax reduces the friction and increases the galling résistance of the lubricant coating layer 21. The wax also reduces the flowability of the lubricant coating layer 21, and increases the strength of the lubricant coating layer 21.
The content of the wax in the composition is preferably from 2 to 30% in mass percent based on the total amount of non-volatile components in the composition. When the wax content is 2% or more, the aforementioned effects can be sufficiently obtained. When the content is not more than 30%, the necessary adhesion properties and strength of the lubricant coating layer 21 are sufficiently obtained. A further préférable lower limit of the wax content is 5%, and more preferably is 10%. A further préférable upper limit of the wax content is 20%, and more preferably is 15%.
[Basic Métal Sait of Aromatic Organic Acid]
The basic métal sait of an aromatic organic acid is a sait constituted by an aromatic
-20organic acid and a surplus alkali (alkali métal or alkaline earth métal). The basic métal sait of an aromatic organic acid, for example, is a substance which is présent in a grease form or semisolid form at normal température. In the basic métal sait of an aromatic organic acid, a surplus content of alkali is dispersed in oil as a métal sait of colloïdal fine particles.
An anticorrosion property of the composition is significantly increased by containing a basic métal sait of an aromatic organic acid therein. In addition, by containing a basic métal sait of an aromatic organic acid, the galling résistance of the lubricant coating layer 21 also increases. The reason these effects are obtained is that, because the basic métal sait of an aromatic organic acid is présent in a colloïdal fine particle state, surplus métal salts are physically adsorbed, or chemically adsorbed by organic acid groups.
Examples of the métal sait of an aromatic organic acid include basic sulfonates, basic salicylates, basic phenates and basic carboxylates.
The alkali that constitutes a cation portion of the basic métal sait of an aromatic organic acid is, for example, one or more types of alkali selected from a group consisting of alkali metals and alkaline earth metals. The alkali is preferably an alkaline earth métal, and further preferably is one or more types selected from a group consisting of calcium, barium and magnésium.
That is, the basic métal sait of an aromatic organic acid is, for example, one or more types
-21 of métal sait selected from a group consisting of basic sodium sulfonate, basic potassium sulfonate, basic magnésium sulfonate, basic calcium sulfonate, basic barium sulfonate, basic sodium salicylate, basic potassium salicylate, basic magnésium salicylate, basic calcium salicylate, basic barium salicylate, basic sodium phenate, basic potassium phenate, basic magnésium phenate, basic calcium phenate, basic barium phenate, basic sodium carboxylate, basic potassium carboxylate, basic magnésium carboxylate, basic calcium carboxylate and basic barium carboxylate.
The higher that a base number of the basic métal sait of an aromatic organic acid is, the more that an amount of fine particle métal salts which function as a solid lubricant increases. As a resuit, the galling résistance of the lubricant coating layer 21 increases. Further, when the base number is higher than a certain level, there is an action that neutralizes an acid component. As a resuit, an anti-rust power of the lubricant coating also increases. Therefore, the basic métal sait of an aromatic organic acid preferably has a base number (JIS K2501) (in a case of using two or more types, a weighted average value of base numbers for which an amount is taken into considération) of 50 to 500 mg KOH/g. When the base number is 50 mg KOH/g or more, the aforementioned effects are sufficiently obtained. When the base number is not more than 500 mg KOH/g, hydrophilicity can be decreased and sufficient anti-rust properties are obtained. A further préférable lower limit of the base number of the basic métal sait of an aromatic organic acid is 100 mg KOH/g, and more preferably is 200 mg KOH/g, and further preferably is 250 mg KOH/g. A further préférable upper limit of the base number of the basic métal sait of an aromatic organic acid is 450 mg KOH/g.
-22As described above, the basic métal sait of an aromatic organic acid is a substance in a grease form or semisolid form, and can also serve as a base of the lubricant coating layer 21. Therefore, the basic métal sait of an aromatic organic acid can be contained in a large amount of up to 70% in mass percent based on the total amount of non-volatile components in the composition. The lower limit of the content of the basic métal sait of an aromatic organic acid is, in mass percent based on the total amount of non-volatile components in the composition, preferably 20%, and more preferably is 40%. The upper limit of the content of the basic métal sait of an aromatic organic acid is preferably 70%.
[Lubricant Powder]
The composition may contain a lubricant powder in order to further increase the lubricity of the lubricant coating layer 21. The tenu lubricant powder generically refers to additives having lubricity. A powder that is known in the art can be used as the lubricant powder.
A lubricant powder can be categorized into, for example, the following four types. The lubricant powder includes at least one type selected from the group consisting of the following (l)to (4):
(1) Lubricant powders having a particular crystal structure, such as a lamellar hexagonal crystal structure, in which a slip easily occurs and which thereby exhibits lubricity (e.g., graphite, zinc oxide, and boron nitride);
(2) Lubricant powders including a reactive element in addition to a particular crystal structure and thereby exhibiting lubricity (e.g., molybdenum disulfide, tungsten disulfîde,
-23graphite fluoride, tin sulfide, and bismuth sulfide);
(3) Lubricant powders exhibiting lubricity due to Chemical reactivity (e.g., thiosulfate compounds); and (4) Lubricant powders exhibiting lubricity due to plastic or viscoplastic behavior under frictional stresses (e.g., polytetrafluoroethylene (PTFE) and polyamide).
Any of the lubricant powders described in (l) to (4) above can be used. Therefore, the lubricant powder is, for example, one or more types selected from a group consisting of graphite, zinc oxide, boron nitride, molybdenum disulfide, tungsten disulfide, graphite fluoride, tin sulfide, bismuth sulfide, thiosulfate compounds, polytetrafluoroethylene (PTFE) and polyamide.
One of the lubricant powders described in (1) to (4) above may be used alone. For example, a lubricant powder described in (1) may be used alone. Two or more of the lubricant powders described in (1) to (4) above may be used in combination. For example, a lubricant powder described in (4) may be used in combination with a lubricant powder described in (1) above.
Preferably, the lubricant powder contains one or more types selected from the group consisting of the aforementioned (1) and (4). Among the lubricant powders (1), graphite is preferred from the standpoint of adhesion properties and anti-rust properties of the lubricant coating layer 21 or earthy graphite is preferred from the standpoint of film forming properties. Among the lubricant powder (4), polytetrafluoroethylene (PTFE) is preferred.
-24Further preferably, the lubricant powder is polytetrafluoroethylene (PTFE).
The content of the lubricant powder in the composition is preferably in the range of 0.5 to 20% in mass percent based on the total amount of non-volatile components in the composition. When the content of the lubricant powder is not less than 0.5%, the galling résistance is further enhanced. This increases the number of operations of fastening and loosening that can be performed before galling occurs. On the other hand, if the content of the lubricant additive is not more than 20%, the strength of the lubricant coating layer 21 increases further. As a resuit, wear of the lubricant coating layer 21 is inhibited. The upper limit of the content ofthe lubricant powder is more preferably 15%, and further preferably is 10%.
[Volatile Organic Solvent]
The composition may contain a volatile organic solvent. In a case of performing the application at normal température, the composition is prepared by adding a volatile organic solvent to the mixture of the components of the composition of the lubricant coating layer 21. The volatile organic solvent is different from a base oil of the lubricating oil, and evaporates during a lubricant coating layer formation step. Therefore, the volatile organic solvent substantially does not remain in the lubricant coating. The term volatile means that there is a tendency for the organic solvent to evaporate in a coating state at a température in the range of room température to 150°C. However, the lubricant coating layer 21 ofthe présent embodiment may be a viscous liquid or semisolid, and hence it is acceptable for a certain amount of solvent to remain.
-25 The type of the volatile organic solvent is not particularly limited. For example, the volatile organic solvent is a petroieum solvent. The petroieum solvent is, for example, one or more types of solvent selected from a group consisting of a solvent corresponding to industrial gasoline defined by JIS K 2201, minerai sprit, aromatic petroieum naphtha, xylene, and Cellosolve.
A volatile organic solvent having a flash point of 30°C or higher, an initial boiling point of l50°C or higher, and an end point of not more than 210°C is préférable from the viewpoint that it is relatively easy to handle, and also evaporates rapidly, and thus the drying time is short.
The proportion of the volatile organic solvent may be adjusted to an appropriate viscosity according to the application method. The content of the volatile organic solvent is, for example, 20 to 50 parts when taking the total amount of non-volatile components as 100 parts.
[Other Components]
The composition may also contain an anti-rust additive, an antiseptie agent and a coloring pigment or the like that are known in the art.
[Anti-rust Additive]
The lubricant coating layer 21 needs to hâve anti-rust properties that can be maintained for a long period of time before being actually used. For this reason, the composition may include an anti-rust additive. The anti-rust additive generically refers to additives having
-26corrosion résistance properties. The anti-rust additive includes, for example, one or more additives selected from the group consisting of aluminum tripolyphosphate, aluminum phosphite, and calcium ion-exchanged silica. Preferably, the anti-rust additive includes at least one selected from the group consisting of calcium ion-exchanged silica and aluminum phosphite. Other examples of the anti-rust additives that may be employed include a commercially available reactive water repellent agent.
The content of the anti-rust additive in the composition is preferably in the range of 2 to 10% in mass percent based on the total amount of non-volatile components in the composition. When the content of the anti-rust additive is not less than 2%, the lubricant coating layer 21 further exhibits consistently high anti-rust properties. On the other hand, when the content of the anti-rust additive is not greater than 10%, the lubricant coating layer 21 exhibits consistently high lubricity. If the content of the anti-rust additive is greater than 10%, the anti-rust effect will reach saturation.
[Antiseptie Agent]
The composition may further contain an antiseptie agent. The antiseptie agent also generically refers to additives having corrosion résistance properties.
By mixing together the aforementioned Cr2O3, métal soap, wax, basic métal sait of an aromatic organic acid and other components, the threaded connection 1 for pipes or tubes of the présent embodiment that has the lubricant coating layer 21 can be produced.
-27 [Métal Plating Layer]
The threaded connection l for pipes or tubes of the présent embodiment may further include a métal plating layer between at least one of the contact surfaces of the pin 5 and the box 8, and the lubricant coating layer 21. The métal plating layer is, for example, a single-layer plating layer formed of Cu, Sn or Ni métal, a single-layer plating layer formed of a Cu-Sn alloy, a two-layer plating layer formed of a Cu layer and an Sn layer, or a three-layer plating layer formed of an Ni layer, a Cu layer and an Sn layer.
The hardness of the métal plating layer is preferably a micro-Vickers hardness of 300 or more. If the hardness of the métal plating layer is 300 or more, the threaded connection 1 for pipes or tubes exhibits consistently high corrosion résistance.
The hardness of the métal plating layer can be measured as follows. Five arbitrary régions are selected in the métal plating layer of the obtained threaded connection 1 for pipes or tubes. The Vickers hardness (HV) in each of the selected régions is measured in accordance with JIS Z 2244 (2009). The test conditions are, a test température of normal température (25°C) and a test force of 2.94 N (300 gf). The mean of the obtained values (from a total of 5 places) is defined as the hardness of the métal plating layer.
In the case of multi-layer plating treatments, the thickness of the lowermost plating layer is preferably less than 1 pm. The thickness of the plating layer (total thickness of plating layers in the case of multi-layer plating) is preferably in the range of 5 to 15 pm.
-28The thickness of the métal plating layer is measured as follows. A probe of an eddy current phase-type film thickness measuring instrument conforming to ISO (International Organization for Standardization) 21968 (2005) is brought into contact with the contact surface on which the métal plating layer is formed. A phase différence between a high-frequency magnetic field on the input side of the probe and an eddy current on the métal plating layer that was excited by the high-frequency magnetic field is measured. The phase différence is converted into a thickness of the métal plating layer.
[Chemical Conversion Treatment Coating]
The threaded connection 1 for pipes or tubes of the présent embodiment may further include, below the lubricant coating layer 21, a Chemical conversion treatment coating having a surface that contacts the lubricant coating layer 21. Examples of the Chemical conversion treatment coating include an oxalate Chemical conversion treatment coating and a borate Chemical conversion treatment coating.
The Chemical conversion treatment coating is porous. Thus, when the lubricant coating layer 21 is formed on the Chemical conversion treatment coating, the so-called anchoring effect is produced and, as a resuit, the lubricant coating layer 21 exhibits further increased adhesion properties. The thickness of the Chemical conversion treatment coating is preferably in the range of 5 to 40 pm. When the thickness of the Chemical conversion treatment coating is not less than 5 pm, sufficient corrosion résistance can be ensured. When the thickness of the Chemical conversion treatment coating is not greater than 40 pm, the lubricant coating layer 21
-29exhibits consistently high adhesion properties.
[Surface Subjected to Blasting Treatment or Surface Subjected to Pickling]
In the threaded connection l for pipes or tubes of the présent embodiment, a surface that contacts the lubricant coating layer 21 may be a surface that was subjected to a blasting treatment or pickling.
A surface that was subjected to a blasting treatment or a surface that was subjected to pickling has surface roughness. The surface roughness preferably has an arithmetic mean roughness Ra of 1 to 8 pm and a sampling length of 2.5 mm. When the arithmetic mean roughness Ra is not less than 1 pm, the lubricant coating layer 21 exhibits further enhanced adhesion properties. When the arithmetic mean roughness Ra is not greater than 8 pm, friction is inhibited and therefore damage and délamination of the lubricant coating layer 21 is inhibited.
The arithmetic mean roughness Ra referred to in the présent description is measured based on JIS B 0601 (2001). For example, the arithmetic mean roughness Ra can be measured using a scanning probe microscope (SPI 38OON, manufactured by SII NanoTechnology Inc.). The measurement conditions are, for example, the number of acquired data points of 1024 x 1024 in sample régions of 2 pm x 2 pm as a unit of acquired data. The sampling length is 2.5 mm. The greater the arithmetic mean roughness Ra is, the more the contact area with the lubricant coating layer 21 increases. Therefore, the adhesion properties with respect to the lubricant coating layer 21 increase by an anchoring effect. When the adhesion properties ofthe
-30lubricant coating layer 21 increase, the threaded connection 1 for pipes or tubes exhibits further increased galling résistance.
[Base Métal of Threaded connection 1 for pipes or tubes]
The composition of the base métal of the threaded connection 1 for pipes or tubes is not particularly limited. Examples of the base métal include carbon steels, stainless steels and alloy steels. Among alloy steels, high alloy steels such as duplex stainless steels that contain alloying éléments such as Cr, Ni and Mo and an Ni alloy hâve high corrosion résistance. Therefore by using these high alloy steels as a base métal, excellent corrosion résistance is obtained in a corrosive environment that contains hydrogen sulfide or carbon dioxide or the like.
[Production Method]
Hereinafter, a method according to the présent embodiment for producing the threaded connection 1 for pipes or tubes will be described.
A method for producing the threaded connection 1 for pipes or tubes according to the présent embodiment includes a lubricant coating layer formation step of forming the lubricant coating layer 21 using the composition of the présent embodiment on at least one of the contact surfaces of the pin 5 and the box 8.
[Lubricant coating layer formation step]
In the lubricant coating layer formation step, a mixture of the constituent components of
-31 the composition described above is liquified by solvent addition and/or heating, and the liquid mixture is applied onto at least one of the contact surfaces of the pin 5 and the box 8. The composition that was applied onto the contact surface is dried as necessary, to thereby form the lubricant coating layer 21. There are no restrictions regarding the States of the lubricant coating layer 21. The States ofthe lubricant coating layer 21 include, for example, solid, viscous liquid or semisolid.
Firstly, the composition is prepared. The composition of a solventless type may be prepared, for example, by heating a mixture of the constituent components of the aforementioned composition to a molten state, and kneading them. The composition may be made of a powder mixture prepared by mixing ail the components in powder form.
The composition of a solvent type may be prepared, for example, by dissolving or dispersing the Cr2O3, the métal soap, the wax and the basic métal sait of an aromatic organic acid in a volatile organic solvent and mixing them.
For the composition of a solventless type, a hot melt process may be employed to apply the composition. In the hot melt process, the composition is heated to melt to a fluid state with low viscosity. The composition in a fluid state can be sprayed from a spray gun having functions for température holding. The composition is heated and melted within a tank including a suitable stirring mechanism, is supplied via a metering pump to the spray head (held at a predetermined température) of the spray gun by a compresser, and is sprayed. The heating
-32température is, for example, in a range of 90 to 130°C. The holding températures for the tank interior and the spray head are adjusted in accordance with the melting point in the composition. Another application method, such as brushing or dipping, may be employed in place of spray coating. The température to which the composition is heated is preferably higher than the melting point of the composition by 10 to 50°C. Prior to application of the composition, at least one contact surface, to which the composition is to be applied, of the pin 5 or of the box 8, is preferably heated to a température higher than the melting point of the base material. This makes it possible to achieve good coating properties.
In the case of the composition of a solvent type, the composition in solution fonn is applied to the contact surface by spray coating or by another method. In this case, the viscosity of the composition is to be adjusted so that it can be applied by spraying in an environment at normal température and pressure.
In the case of the composition of a solventless type, the lubricant coating layer 21 is formed by cooling the composition applied to the contact surface to allow the composition in a molten State to dry. The cooling process can be carried out by a method known in the art. Examples of the cooling process include natural cooling and air cooling.
In the case of the composition of a solvent type, the lubricant coating layer 21 is formed by drying the composition applied to the contact surface. The drying process can be carried out by a method known in the art. Examples of the drying process include natural drying, low19598
-33température air drying, and vacuum drying.
The cooling may be carried out by rapid cooling using, for example, a nitrogen gas cooling system or a carbon dioxide cooling system. In the case where rapid cooling is performed, the cooling is carried out in an indirect manner at the opposite surface to the contact surface (in the case of the box 8, at the outer surface of the steel pipe 2 or the coupling 3, and in the case of the pin 5, at the inner surface of the Steel pipe 2). This inhibits dégradation of the lubricant coating layer 21 that may be caused by rapid cooling.
Preferably, the lubricant coating layer 21 covers ail of at least one of the contact surfaces of the pin 5 and the box 8. The lubricant coating layer 21 may cover only part of the contact surfaces (e.g., only the métal seal portions 10 and 13).
The lubricant coating layer 21 may be formed of a single layer or multiple layers. The term multiple layers refers to two or more layers of the lubricant coating layer 21 deposited in sequence from the contact surface side. The two or more layers of the lubricant coating layer 21 can be formed by repeating the application and drying of the composition. The lubricant coating layer 21 may be formed directly on the contact surface or may be formed after a surface préparation treatment(s) described below is performed on the contact surface.
The thickness of the lubricant coating layer 21 is preferably 10 to 40 pm. When the thickness of the lubricant coating layer 21 is 10 pm or more, a high lubricity can be stably
-34obtained. On the other hand, when the thickness of the lubricant coating layer 21 is not more than 40 pm, the adhesion properties of the lubricant coating layer 21 are stable. Furthermore, when the thickness of the lubricant coating layer 21 is not more than 40 pm, because the thread tolérance (clearance) of the sliding surfaces widens, interfacial pressure during sliding becomes lower. Therefore, the fastening torque can be inhibited from becoming excessively high. Accordingly, the thickness ofthe lubricant coating layer 21 is preferably 10 to 40 pm.
The thickness of the lubricant coating layer 21 is measured by the following method. The lubricant coating layer is applied onto a flat plate under the same conditions as those for applying the lubricant coating layer 21 onto the threaded connection 1 for pipes or tubes. Among the conditions for the application onto the threaded connection 1 for pipes or tubes and the flat plate, conditions such as the following are to be matched: the distance between the object to be coated and the tip of the nozzle, the spray pressure, the viscosity of the composition, and the rotational speed of the object to be coated. To match the respective viscosities of the composition, the températures of the tank, tube, and nozzle head are to be matched between the threaded connection 1 for pipes or tubes and the flat plate. The amount of the composition applied per unit time is calculated from the différence between the weight of the flat plate before application of the composition and the weight of the flat plate after application ofthe composition. The composition is dried on the flat plate to form the lubricant coating layer 21. The thickness of the lubricant coating layer 21 is measured using a thickness meter. The weight of the lubricant coating layer 21 is calculated from the différence between the weight of the flat plate before application of the composition and the weight of the flat plate after formation ofthe
-35lubricant coating layer 21. The density of the lubricant coating layer 21 is calculated from the thickness and weight of the lubricant coating layer 21. Next, the area to be coated on the threaded connection 1 for pipes or tubes is calculated based on the thread shape and dimensions (inside diameter, wall thickness, etc.). The area to be coated corresponds to the area ofthe threaded surface with recesses and projections when it is supposed that the threaded surface is unfolded to a fiat configuration. The average thickness of the lubricant coating layer 21 over the threaded connection 1 for pipes or tubes is calculated based on the time period of application of the composition to the threaded connection 1 for pipes or tubes, the area to be coated, and the density ofthe lubricant coating layer 21.
[Métal plating layer formation step]
The method for producing the threaded connection 1 for pipes or tubes according to the présent embodiment may include a métal plating layer formation step before the lubricant coating layer formation step. Métal plating layer can be formed, for example, by electroplating treatment or impact plating treatment.
[Electroplating Treatment]
The electroplating treatment is, for example, a treatment that forms a métal plating layer by electroplating. The métal plating layer is, for example, a Zn alloy plating layer. In the case of forming a Zn alloy plating layer, in the electroplating treatment, the Zn alloy plating layer may be formed by an electroplating treatment on at least one of the contact surfaces of the pin 5 and the box 8.
-36Altematively, in the electroplating treatment, a Zn alloy plating layer may be formed by an electroplating treatment on surface roughness formed on at least one of the contact surfaces of the pin 5 and the box 8.
By performing the electroplating treatment, the galling résistance and corrosion résistance of the threaded connection l for pipes or tubes are increased. In the case of forming a Zn alloy plating layer, examples of the electroplating treatment step include a treatment of applying a single layer of plating that includes Cu, Sn, or Ni métal, a treatment of applying a single layer of plating that includes a Cu-Sn alloy, a treatment of applying a two-layer plating including a Cu layer and an Sn layer, and a treatment of applying a three-layer plating including an Ni layer, a Cu layer and an Sn layer. For the steel pipe 2 formed from a steel having a Cr content of 5% or greater, preferred treatments are a Cu-Sn alloy plating treatment, a two-layer plating treatment in which a Cu plating and a Sn plating are applied, and a three-layer plating treatment in which an Ni plating, a Cu plating, and a Sn plating are applied. More preferred treatments are a twolayer plating treatment in which a Cu plating and an Sn plating are applied, a Zn-Co alloy plating treatment, a Cu-Sn-Zn alloy plating treatment, and a Zn-Ni alloy plating treatment.
The electroplating treatment can be carried out by a method known in the art. For example, a plating bath including ions of the métal éléments to be contained in the alloy plating layer is prepared. Next, at least one of the contact surfaces of the pin 5 and the box 8 is immersed in the plating bath. By current conduction through the contact surface, an alloy plating layer is formed on the contact surface. The treatment conditions including the
-37température of the plating bath and the duration of the plating treatment may be set appropriately.
More specifically, for example, in the case of forming a Cu-Sn-Zn alloy plating layer, the plating bath contains copper ions, tin ions and zinc ions. The composition of the plating bath is preferably Cu: 1 to 50 g/L, Sn: 1 to 50 g/L and Zn: 1 to 50 g/L. The electroplating conditions are, for example, a plating bath pH of 1 to 10, a plating bath température of 60°C, a current density of 1 to 100 A/dm2 and a treatment time of 0.1 to 30 minutes.
In the case of forming a Zn-Ni alloy plating layer, the plating bath contains zinc ions and nickel ions. The composition of the plating bath is preferably Zn: 1 to 100 g/L and Ni: 1 to 50 g/L. The electroplating conditions are, for example, a plating bath pH of 1 to 10, a plating bath température of 60°C, a current density of 1 to 100 A/dm2 and a treatment time of 0.1 to 30 minutes.
[Impact Plating Treatment]
An impact plating treatment is a treatment that can be performed by mechanical plating in which particles are allowed to collide with a material to be plated inside a rotating barrel, or by projection plating in which particles are caused to collide against a material to be plated using a blasting apparatus.
In the method for producing the threaded connection 1 for pipes or tubes according to the présent embodiment, a blasting treatment or pickling may be performed with respect to a surface
- 38 that contacts the lubricant coating layer 21. Surface roughness can be formed by the blasting treatment or pickling.
[Blasting Treatment]
The blasting treatment is, for example, a treatment in which particles are caused to collide against a material to be plated using a blasting apparatus. The blasting treatment is, for example, a sand blasting treatment. The sand blasting treatment is a treatment in which a blast material (abrasive) is mixed with compressed air and the mixture is propelled onto the contact surface. Examples of the blast material include spherical shot material and angular grit material. The sand blasting treatment increases the surface roughness of the contact surface. The sand blasting treatment may be carried out by a method known in the art. For example, air is compressed by a compressor and a blast material is mixed with the compressed air. The blast material may be made of, for example, stainless steel, aluminum, ceramic, or alumina. The sand blasting treatment conditions such as propelling speed may be set appropriaiely.
[Pickling Treatment]
The pickling treatment is a treatment in which the contact surface is immersed and roughened in a solution of a strong acid such as sulfuric acid, hydrochloric acid, nitric acid, or hydrofluoric acid. This increases the surface roughness of the contact surface. The pickling treatment is, for example, a Chemical conversion treatment.
-39[Chemical conversion treatment step]
The method for producing the threaded connection l for pipes or tubes according to the présent embodiment may also include a Chemical conversion treatment step before the lubricant coating layer formation step. In the Chemical conversion treatment step, a Chemical conversion treatment is performed to form, below the lubricant coating layer 21, a Chemical conversion treatment coating having a surface that contacts the lubricant coating layer 21.
The chemical conversion treatment is a treatment in which a porous Chemical conversion coating having a high surface roughness is formed. Examples of the chemical conversion treatment include phosphate chemical conversion treatments, oxalate chemical conversion treatment, and borate chemical conversion treatment. From the standpoint of adhesion properties ofthe lubricant coating layer 21, a phosphate chemical conversion treatment is preferred. The phosphate chemical conversion treatment is, for example, a phosphate chemical conversion treatment using manganèse phosphate, zinc phosphate, manganèse iron phosphate, or calcium zinc phosphate.
The phosphate chemical conversion treatment can be carried out by a method known in the art. The treatment solution may be a common acidic solution for phosphate chemical conversion treatment for zinc-plated products. An example of the solution is a solution for zinc phosphate chemical conversion treatment containing 1 to 150 g/L of phosphate ions, 3 to 70 g/L of zinc ions, 1 to 100 g/L of nitrate ions, and 0 to 30 g/L of nickel ions. Solutions for manganèse phosphate chemical conversion treatments, which are conventionally used for
-40threaded connection l for pipes or tubes, may also be used. The température of the solution is in the range of room température to 100°C, for example. The treatment time may be set depending on the desired thickness of the coating and, for example, may be 15 minutes. To facilitate the formation of the Chemical conversion coating, surface modification may be performed prior to the phosphate Chemical conversion treatment. The surface modification refers to the treatment including immersion in a surface modification aqueous solution containing colloïdal titanium. After the phosphate Chemical conversion treatment, it is preferred that rinsing with water or with warm water is carried out before drying.
Before the formation of the lubricant coating layer described above, only one type of treatment may be performed or a plurality of the treatments may be performed in combination.
Before the formation of the lubricant coating layer, the treatments performed for the pin 5 and the box 8 may be the same, or the treatments performed for the pin 5 and the box 8 may be different.
EXAMPLE
An example of the présent invention will be described below. It should be noted that the présent invention is not limited to the example. In the example, the contact surface of the pin is referred to as the pin surface and the contact surface of the box is referred to as the box surface. Unless otherwise specified, percent in the example means mass percent.
In the présent example, VAM21 (registered trademark) manufactured by NIPPON
-41 STEEL & SUMITOMO METAL CORPORATION were used. VAM21 (registered trademark) is a threaded connection for pipes or tubes having an outside diameter of 177.80 mm (7 inches) and a wall thickness of 11.506 mm (0.453 inches). The Steel grade was carbon Steel. The carbon Steel had a composition, C: 0.24%, Si: 0.23%, Mn: 0.7%, P: 0.02%, S: 0.01%, Cu: 0.04%, 5 Ni: 0.05%, Cr: 0.95%, Mo: 0.15%, and the balance: Fe and impurities.
Surface préparation treatments were performed on the pin surface and the box surface of the respective test numbers as shown in Table 1. The numbers in the Surface Préparation Treatment column in Table 1 show the order in which the surface préparation treatment was 10 performed. For example, in the case of 1. Finish grinding, 2. Zinc phosphate, finish grinding was performed, and thereafter a zinc phosphate chemical conversion treatment was performed. In the sand blasting process, abrasive grain of 100 mesh was used and surface roughness was formed. The arithmetic mean roughness Ra for each test number was as shown in Table 1.
The arithmetic mean roughness Ra was measured based on JIS B 0601 (2013). Measurement 15 of the arithmetic mean roughness Ra was performed using a scanning probe microscope (SPI 3800N, manufactured by SII NanoTechnology Inc.). The measurement conditions were the number of acquired data points of 1024 x 1024 in sample régions of 2 μιη x 2 pm as a unit of acquired data. The thickness of the Zn-Ni alloy coating was measured by the aforementioned measurement method.
-42 [Table l]
| Test No. | Pin | Box | ||
| Surface Préparation Treatment | Arithrrietic Mean Roughness Ra (pm) | Surface Préparation Treatment | Arithmetic Mean Roughness Ra (pm) | |
| 1 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2. Zinc phosphate | 1.0 | 2. Manganèse phosphate | 1.2 | |
| 3 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2. Zinc phosphate | 1.0 | 2. Manganèse phosphate | 1.2 | |
| 4 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2. Zinc phosphate | 1.0 | 2. Manganèse phosphate | 1.2 | |
| 5 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2. Zinc phosphate | 1.0 | 2. Zn-Ni plating (coating thickness 8.0 pm) | 0.5 | |
| 6 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2. Sand blasting | 1.8 | 2. Sand blasting | 1.8 | |
| 7 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2. Sand blasting | 1.8 | 2. Sand blasting | 1.8 | |
| 8 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2. Zinc phosphate | 1.0 | 2. Manganèse phosphate | 1.2 | |
| 9 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2. Zinc phosphate | 1.0 | 2. Manganèse phosphate | 1.3 | |
| 10 | 1. Finish grinding | 0.3 | 1. Finish grinding | 0.3 |
| 2. Zinc phosphate | 1.0 | 2. Manganèse phosphate | 1.3 |
-43 Thereafter, lubricant coating layers were formed using the respective compositions having the Chemical compositions shown in Table 2, and a pin and a box were prepared for each test number. The content in mass percent that is based on the total amount of the non-volatile components of the composition is shown in brackets in the column for Non-volatile Components Composition of Composition in Table 2. A product with the product name Green F3 manufactured by Nippon Chemical Industrial Co., Ltd. was used as the Cr2O3. Castearate manufactured by DIC Corporation was used as the métal soap. Paraffin Wax manufactured by Nippon Seiro Co., Ltd. was used as the wax. As a basic métal sait of an aromatic organic acid, Calcinate (registered trademark) C400CLR (base number: 400 mg KOH/g) manufactured by Chemtura Corporation was used as a basic Ca sulfonate. In the case of using graphite as a lubricant powder, a graphite powder Blue P (trade name) (ash content: 3.79%, crystallinity: 96.9%, average particle size: 7 pm) manufactured by Nippon Graphite Industries, Ltd. was used. In the case of using PTFE as a lubricant powder, Lubron (registered trademark) L-5F manufactured by Daikin Industries, Ltd. was used. As a volatile organic solvent, a solvent with the product name Exxsol (registered trademark) D40 manufactured by ExxonMobil Chemical Company was used. Note that, in Test No. 8, a compound grease defined in API standard BUL 5A2 was used instead of a composition for forming a lubricant coating layer. Although the compound grease contained heavy metals such as lead and is harmful to humans and the environment, the lubricity thereof is favorable, and therefore the compound grease was adopted as a reference for evaluating over-torque performance that is described later.
-44[Table 2]
| Test No. | Non-volatile Components Composition of Composition (numerical value in parenthèses shows the content in mass%) | Organic solvent (per 100 parts of total amount of non-volatile components) | Application method | ||||
| Cr2O3 | Métal soap | Wax | Basic métal sait of aromatic organic acid | Lubricant powder | |||
| 1 | (1) | Stéarate Ca (19) | Paraffin wax (20) | Basic Ca sulfonate (60) | None | 30 parts | Normal température spraying |
| 2 | (5) | Stéarate Ca (10) | Paraffin wax (15) | Basic Ca sulfonate (70) | None | 30 parts | Normal température spraying |
| 3 | (10) | Stéarate Ca (15) | Paraffin wax (10) | Basic Ca sulfonate (65) | None | 30 parts | Normal température spraying |
| 4 | (20) | Stéarate Ca (4) | Paraffin wax (5) | Basic Ca sulfonate (71) | None | 30 parts | Normal température spraying |
| 5 | (15) | Stéarate Ca (17) | Paraffin wax (15) | Basic Ca phenate (48) | Graphite (5) | None | Heat spraying |
| 6 | (10) | Stéarate Ca (10) | Paraffin wax (10) | Basic Ca salicylate (60) | PTFE (10) | 30 parts | Normal température spraying |
| 7 | (25) | Stéarate Ca (10) | Paraffin wax (10) | Basic Ca salicylate (45) | PTFE (10) | 30 parts | Normal température spraying |
| 8 | Compound grease defined in API Standard BUL 5A2 | Brush | |||||
| 9 | None | Stéarate Ca (15) | Paraffin wax (10) | Basic Ca sulfonate(75) | None | 30 parts | Normal température spraying |
| 10 | CaF2 (10) | Stéarate Ca (10) | Paraffin wax (10) | Basic Ca sulfonate(60) | PTFE (10) | 30 parts | Normal température spraying |
-45[TestNo. I]
In Test No. 1, finish machine grinding was performed on the pin surface and the box surface. Thereafter, a composition for forming a lubricant coating layer was applied onto the pin surface and the box surface by spraying at normal température (approximately 20°C) to form lubricant coating layers. With regard to the coating thickness, a target average coating thickness was calculated using the weight and spécifie gravity of the composition to be applied per unit area and unit time based on a predetermined spraying pressure and a distance to the target surface, and application was performed so that the value thereof was in the range of 120 to 150 pm.
[Test No. 2 to Test No. 4]
In Test No. 2 to Test No. 4, finish machine grinding was performed on the pin surface and the box surface. The pin surface was immersed in a solution for zinc phosphate Chemical conversion treatment at 75 to 85°C for 10 minutes to form a zinc phosphate coating having a thickness of 10 pm. The box surface was immersed in a solution for manganèse phosphate Chemical conversion treatment at 80 to 95°C for 10 minutes to form a manganèse phosphate coating having a thickness of 12 pm. Thereafter, a composition for forming a lubricant coating layer was applied onto the pin surface and the box surface by spraying at normal température (approximately 20°C) to form lubricant coating layers. With regard to the coating thickness, a target average coating thickness was calculated using the weight and spécifie gravity ofthe composition to be applied per unit area and unit time based on a predetermined spraying pressure and the distance to the target surface, and application was performed so that the value thereof
-46 was in the range of 120 to 150 pm.
[Test No. 5]
In Test No. 5, finish machine grinding was performed on the pin surface. The pin surface was immersed in a solution for zinc phosphate Chemical conversion treatment at 75 to 85°C for 10 minutes to form a zinc phosphate coating having a thickness of 10 pm. Thereafter, a lubricant coating layer was formed thereon by applying a composition for forming a lubricant coating layer onto the zinc phosphate coating by spraying at normal température (approximately 20°C). With regard to the coating thickness, a target average coating thickness was calculated using the weight and spécifie gravity of the composition to be applied per unit area and unit time based on a predetermined spraying pressure and the distance to the target surface, and application was performed so that the value thereof was in the range of 120 to 150 pm.
Finish machine grinding was performed on the box surface. Thereafter, Zn-Ni alloy plating was performed by electroplating to form a Zn-Ni alloy plating layer on the box surface. The Zn-Ni alloy plating bath used was DAIN Zinalloy N-PL (trade name) manufactured by Daiwa Fine Chemicals Co., Ltd. The electroplating was performed under conditions of a plating bath pH of 6.5, a plating bath température of 25°C, a current density of 2A/dm2, and a treatment time of 18 minutes. The Zn-Ni alloy plating layer had a composition of Zn: 85% and Ni: 15%. A lubricant coating layer was formed thereon by application of a composition for forming a lubricant coating layer by heated (approximately 110°C) spray application and slow cooling. With regard to the coating thickness, a target average coating thickness was calculated
-47 using the weight and spécifie gravity of the composition to be applied per unit area and unit time based on a predetermined spraying pressure and the distance to the target surface, and application was performed so that the value thereof was in the range of 120 to 150 pm.
[Test No. 6 and Test No. 7]
In Test No. 6 and Test No. 7, finish machine grinding was performed on the pin surface and the box surface. Thereafter, surface roughness was formed on the pin surface and the box surface by a blasting process. A composition for forming a lubricant coating layer was then applied onto the pin surface and the box surface by spraying at normal température (approximately 20°C) to form lubricant coating layers. With regard to the coating thickness, a target average coating thickness was calculated using the weight and spécifie gravity of the composition to be applied per unit area and unit time based on a predetermined spraying pressure and the distance to the target surface, and application was performed so that the value thereof was in the range of 120 to 150 pm.
[Test No. 8]
In Test No. 8, finish machine grinding was performed on the pin surface and the box surface. The pin surface was immersed in a solution for zinc phosphate Chemical conversion treatment at 75 to 85°C for 10 minutes to form a zinc phosphate coating having a thickness of 10 pm. The box surface was immersed in a solution for manganèse phosphate Chemical conversion treatment at 80 to 95°C for 10 minutes to form a manganèse phosphate coating having a thickness of 12 pm. Thereafter, a dope according to the API standards was applied to
-48the pin surface and the box surface by brushing. The term dope according to the API standards refers to compound grease for threaded connection for oil country tubular goods that is manufactured in accordance with API BUL 5A2. It is defined that the composition of the dope according to the API standards adopts grease as a base material, and contains graphite powder: 18±1.0%, lead powder: 30.5±0.6%, and copper flake: 3.3±O.3%. Note that, it is understood that, within this component range, compound greases for threaded connection for oil country tubular goods hâve équivalent performance.
[Test No. 9]
In Test No. 9, finish machine grinding was performed on the pin surface and the box surface. The pin surface was immersed in a solution for zinc phosphate Chemical conversion treatment at 75 to 85°C for 10 minutes to form a zinc phosphate coating having a thickness of 10 pm. The box surface was immersed in a solution for manganèse phosphate Chemical conversion treatment at 80 to 95°C for 10 minutes to form a manganèse phosphate coating having a thickness of 12 pm. Thereafter, a composition for forming a lubricant coating layer was applied onto the pin surface and the box surface by spraying at normal température (approximately 20°C) to form lubricant coating layers. With regard to the coating thickness, a target average coating thickness was calculated using the weight and spécifie gravity of the composition to be applied per unit area and unit time based on a predetermined spraying pressure and the distance to the target surface, and application was performed so that the value thereof was in the range of 120 to 150 pm. In Test No. 9, Cr2Os was not contained in the composition.
-49[TestNo. ΙΟ]
In Test No. 10, finish machine grinding was performed on the pin surface and the box surface. The pin surface was immersed in a solution for zinc phosphate chemical conversion treatment at 75 to 85°C for 10 minutes to form a zinc phosphate coating having a thickness of 10 pm. The box surface was immersed in a solution for manganèse phosphate chemical conversion treatment at 80 to 95°C for 10 minutes to form a manganèse phosphate coating having a thickness of 12 pm. Thereafter, a composition for forming a lubricant coating layer was applied onto the pin surface and the box surface by spraying at normal température (approximately 20°C) to form lubricant coating layers. With regard to the coating thickness, a target average coating thickness was calculated using the weight and spécifie gravity ofthe composition to be applied per unit area and unit time based on a predetermined spraying pressure and the distance to the target surface, and application was performed so that the value thereof was in the range of 120 to 150 pm. In Test No. 10, CaF2 was contained as a component in the composition instead of Cr2O3.
[Galling Résistance Evaluation Test]
Evaluation of the galling résistance was performed by means of a repeated fastening test. Using the pins and boxes of Test No. 1 to Test No. 10, fastening and loosening were repeated at room température (20°C), and the galling résistance was evaluated. The fastening torque was set to 24350 N-m. Each time one cycle of fastening and loosening was completed, the pin surface and box surface were visually observed. The occurrence of galling on threaded portions and métal seal portions was examined by visual inspection. With respect to the métal seal
-50portions, the test was ended upon the occurrence of galling. When the galling on the threaded portion was minor and was repairable by repairing by filing or the like, the galling flaws were repaired and the test was continued. The maximum number of times for repeating fastening was set as 15 times. The maximum number of times fastening was performed without either unrepairable galling occurring at a threaded portion or galling occurring at a métal seal portion was adopted as the évaluation index for galling résistance. The results are shown in the Galling Résistance (number of times (tums) fastening could be performed without either unrepairable galling occurring at a threaded portion or galling occurring at a métal seal portion) column in Table 3.
[Table 3]
| Test No. | Galling Résistance (number of times (turns) fastening could be performed without either unrepairable galling occurring at a threaded portion or galling occurring at a métal seal portion) | Over-torque Performance |
| 1 | 14 | 115 |
| 2 | 14 | 121 |
| 3 | 14 | 125 |
| 4 | 13 | 138 |
| 5 | 15 | 130 |
| 6 | 15 | 127 |
| 7 | 12 | 143 |
| 8 | 10 | 100 |
| 9 | 5 | 58 |
| 10 | 10 | 98 |
- 51 [Over-torque Performance Test]
Using the pins and boxes of Test No. 1 to Test No. 10, the torque on shoulder résistance ΔΤ' was measured. Specifically, fastening was performed under conditions of a tightening speed of 10 rpm and a tightening torque of 42.8 kN-m. The torque at the time of fastening was measured, and a torque chart as illustrated in FIG. 7 was prepared. Reference characters Ts in FIG. 7 dénoté the shouldering torque. Reference characters MTV in FIG. 7 dénoté a torque value at which a line segment L and the torque chart intersect. The line segment L is a straight line that has the same slope as the slope of a linear région of the torque chart after shouldering, and for which the number of tums is 0.2% more in comparison to the aforementioned linear région. Normally, Ty (yield torque) is used when measuring the torque on shoulder résistance ΔΤ'. However, in the présent example, the yield torque (boundary between a linear région and a non-linear région in the torque chart after shouldering) was indistinct. Therefore, MTV was defined using the line segment L. The différence between MTV and Ts was taken as the torque on shoulder résistance ΔΤ' of the présent example. The over-torque performance was determined as a relative value with respect to the torque on shoulder résistance ΔΤ' of Test No. 8 where a dope according to the API standards was used instead of a lubricant coating layer as a reference (100). The results are shown in Table 3.
[Evaluation Results]
Referring to Table 1 to Table 3, the composition for forming a lubricant coating layer of the threaded connections for pipes or tubes of Test No. 1 to Test No. 7 had C^CU Therefore, galling did not occur even when fastening and loosening were repeated 10 times, and thus
- 52 excellent galling résistance was exhibited. Further, the over-torque performance was more than 100, and the threaded connections for pipes or tubes exhibited excellent over-torque performance.
In the threaded connections for pipes or tubes of Test No. 1 to Test No. 6, the content of Cr2O3 was 1 to 20.0%. Therefore, in the threaded connections for pipes or tubes of Test No. 1 to Test No. 6, the number of times fastening could be performed without galling was greater in comparison to the threaded connection for pipes or tubes of Test No. 7, and hence the galling résistance exhibited by the threaded connections for pipes or tubes of Test No. 1 to Test No. 6 was even more excellent than the galling résistance exhibited by the threaded connection for pipes or tubes of Test No. 7.
On the other hand, the composition for forming a lubricant coating layer of the threaded connection for pipes or tubes of Test No. 9 did not contain Cr2O3. Therefore, the galling résistance and the over-torque performance were low.
The composition for forming a lubricant coating layer of the threaded connection for pipes or tubes of Test No. 10 contained calcium fluoride CaF2, and not Cr2O3. Therefore, the galling résistance and the over-torque performance were low.
An embodiment of the présent invention has been described above. However, the foregoing embodiment is merely an example for implementing the présent invention. Accordingly, the présent invention is not limited to the above embodiment, and the above embodiment can be appropriately modified within a range which does not deviate from the gist
-53 of the présent invention.
REFERENCE SIGNS LIST : Threaded connection for pipes or tubes
4: Male threaded portion
5: Pin
7: Female threaded portion
8: Box
10, 13: Métal seal portion
11, 12: Shoulder portion : Lubricant coating layer
Claims (11)
- l. A composition for forming a lubricant coating layer on a threaded connection for pipes or tubes, the composition containing:Cr2O3, a métal soap, a wax, and a basic métal sait of an aromatic organic acid.
- 2. The composition according to claim 1, wherein:the composition contains, in mass percent based on a total amount of non-volatile components in the composition:Cr2O3: 1 to 20%, the métal soap: 2 to 30%, the wax: 2 to 30%, and the basic métal sait of an aromatic organic acid: 20 to 70%.
- 3. The composition according to claim 1 or claim 2, further containing: a lubricant powder.
- 4. The composition according to claim 3, wherein:the composition contains, in mass percent based on a total amount of non-volatile- 55 components in the composition:the lubricant powder: 0.5 to 20%.
- 5. The composition according to claim 3 or claim 4, wherein:the lubricant powder is one or more types selected from a group consisting of graphite and polytetrafluoroethylene.
- 6. The composition according to any one of claims 1 to 5, further containing:a volatile organic solvent.
- 7. A threaded connection for pipes or tubes that comprises a pin and a box, wherein:the pin and the box each include a contact surface having a threaded portion;the threaded connection for pipes or tubes comprising a lubricant coating layer formed from a composition according to any one of claims 1 to 6 as an outermost layer that is formed on at least one of the contact surfaces of the pin and the box.
- 8. The threaded connection for pipes or tubes according to claim 7, fùrther comprising:a métal plating layer between at least one of the contact surfaces of the pin and the box, and the lubricant coating layer.
- 9. The threaded connection for pipes or tubes according to claim 7 or claim 8, further comprising:-56below the lubricant coating layer, a Chemical conversion treatment coating having a surface that contacts the lubricant coating layer.
- 10. The threaded connection for pipes or tubes according to claim 7 or claim 8, wherein:5 a surface that contacts the lubricant coating layer is subjected to a blasting treatment or to pickling.
- 11. The threaded connection for pipes or tubes according to any one of claims 7 to 10, wherein:10 the contact surface further includes an unthreaded métal contact portion.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-199015 | 2017-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| OA19598A true OA19598A (en) | 2020-12-23 |
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