CN1532300A - Non quenched and tempered seamless steel pipe - Google Patents
Non quenched and tempered seamless steel pipe Download PDFInfo
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- CN1532300A CN1532300A CNA2004100300074A CN200410030007A CN1532300A CN 1532300 A CN1532300 A CN 1532300A CN A2004100300074 A CNA2004100300074 A CN A2004100300074A CN 200410030007 A CN200410030007 A CN 200410030007A CN 1532300 A CN1532300 A CN 1532300A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 22
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 238000005496 tempering Methods 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims description 9
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 239000011651 chromium Substances 0.000 description 19
- 239000011572 manganese Substances 0.000 description 19
- 150000001875 compounds Chemical class 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000003466 welding Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 229910001563 bainite Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 1
- CVOFKRWYWCSDMA-UHFFFAOYSA-N 2-chloro-n-(2,6-diethylphenyl)-n-(methoxymethyl)acetamide;2,6-dinitro-n,n-dipropyl-4-(trifluoromethyl)aniline Chemical compound CCC1=CC=CC(CC)=C1N(COC)C(=O)CCl.CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O CVOFKRWYWCSDMA-UHFFFAOYSA-N 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A non-heat treated seamless steel tube has a composition consisting of, by weight, C: 0.10 to 0.25%, Si: 0.05 to 1.0%, Mn: 0.5 to 2.5%, P: not more than 0.03%, S: not more than 0.05%, Cr: 0.5 to 2.0%, V: 0.03 to 0.3%, Al 0.003 to 0.10%, N: 0.001 to 0.02%, O: not more than 0.003%, and the balance comprises Fe and impurities, in which the carbon equivalent Ceq. (%) defined by the following equation is 0.60 to 0.85%. Ceq.=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.
Description
Technical field
The present invention relates to a kind of non-tempering seamless steel tube that is used for physical construction etc., be specifically related to a kind of can be with hot-rolled tube state non-tempering seamless steel tube directly that use, that have high strength and high tenacity and excellent weldability.
Background technology
In the past, be used for requiring under the high strength non-tempering seamless steel tube of flexible purposes, by following manufacturing.That is, at first,,, make non-tempering seamless steel tube through hot worked perforation process and rolling process by steel billet.Then, by this steel pipe is quenched, tempering, form and to give prescribed strength level and flexible goods.
In the manufacturing of above-mentioned weldless steel tube, owing to behind tubulation, need heat treatment step, thus the cost height, and delivery date is long.For overcoming so problem, strong request is not heat-treated, promptly need not the modified weldless steel tube that yet can have high-intensity high-tenacity.
Need not the modified weldless steel tube that also can have high-intensity high-tenacity, for example, opening flat 05-202447 communique, spy the spy opens flat 09-25541 communique, spy and opens flat 10-130783 communique, spy and open flat 10-204571 communique, spy and open flat 10-324946 communique, spy and open flat 11-36017, spy and open 2000-328192 communique, spy and open 2001-323338 communique, spy and open 2001-247931 communique, spy and open in the 2001-262275 communique etc. open.
Te Kaiping 05-202447 communique, spy open flat 09-25541 communique, spy and open flat 10-130783 communique, spy and open that flat 10-204571 communique, spy are opened flat 10-324946 communique, the spy opens flat 11-36017 and the spy opens the 2000-328192 communique, in order to take into account high strength and toughness under non-modified situation, composition adjustment or hot worked pipe-making method are all disclosed.In addition, in the disclosed technology, common point is the carbon (C) that adds more than 0.2% in these communiques, forms the composition design of medium carbon steel system.In above-mentioned technology in the past, owing to the carbon that contains more than 0.2%, with respect to intensity rank, the toughness deficiency.Particularly, after quench hardening, or reduce toughness, or cause welding crack at weld part.
The spy opens the 2001-323338 communique, and the steel that discloses with large-scale carbon addition is an object, takes into account hot workability, machinability and flexible steel pipe.But, can point out, in the disclosed steel pipe of this communique,, can not guarantee full intensity owing to do not add vanadium (V).
The spy opens the 2001-247931 communique and the spy opens the 2001-262275 communique, and the steel that discloses with the carbon addition of wide region is an object, the tubulation temperature during by the regulation hot rolling, and the control metal structure is guaranteed the technology of intensity, flexible technology or hot workability.But, can point out that in order to be implemented in the low temperature tubulation that proposes in above-mentioned two communiques, in equipment in the past, the motor power deficiency need be carried out scrap build.In addition,, carry out tubulation, have the problem that needs equipment such as reheating furnace by reheat for through after once cooling off.
In addition, open in the 2001-247931 communique the spy, in the scope of claim, though the carbon addition of regulation wide region, in an embodiment, the carbon addition also reaches more than 0.2%.
Summary of the invention
The purpose of this invention is to provide a kind of non-tempering seamless steel tube, can non-ly take into account high strength and high tenacity modifiedly, and can guarantee good weldability.Concrete target is, even tubulation degree of finish or tubulation temperature not in the strict regulation way also can be taken into account high strength and toughness, can prevent that the crackle of weld part or flexible from reducing.
The present inventor finds that achieve the above object, following measure is effective.
(1) reduces the carbon amount.In addition, for replenishing the intensity of following the carbon amount to reduce, compound interpolation manganese (Mn), chromium (Cr) and vanadium (V).Thus, can access high strength, and comprise that weld part also can access good toughness.
(2) on the basis that reduces the carbon amount, carbon equivalent (Ceq.) is adjusted to the scope of regulation.
About non-modified metal structure, standard be the ferritic-pearlitic steel, still, distinguish, if carry out high carbonization, can reduce toughness for the requirement that adapts to high strength.For this reason, the present inventor in order to reduce the carbon amount, replenishes intensity, compound Mn, Cr, the V of having added.Thus, the metal structure of the non-hardened and tempered steel that obtains, forming bainite is the tissue of main body, can guarantee high strength and high tenacity.In addition, so-called " bainite is the tissue of main body ", yes comprises that 100% exists the tissue of bainite, but also can be in bainite and ferritic mixed structure, contains the following ferritic tissue of 50 volume %.
Framework of the present invention is as follows.
(1) suppresses the carbon amount and be lower than 0.2%.
(2) compound interpolation manganese (Mn), chromium (Cr) and vanadium (V).
(3) to form bainite be the tissue of main body to metal structure, and wherein, as can taking into account high strength and high tenacity, the carbon equivalent Cep. (%) that stipulates by following formula satisfies more than 0.60 below 0.85.
Cep.＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
In order to ensure intensity, Ceq. (%) 0.60～0.85 scope just can, as the method that satisfies this scope, can adjust the addition of various alloying elements.The present inventor finds, wherein, and particularly about Mn, Cr and V, if compound interpolation simultaneously can reach intensity and flexible is well balanced.That is, when the same carbon amount, and compare when Mn reaches aim carbon equivalent Ceq. with Cr, when reaching aim carbon equivalent Ceq., can access good toughness by in the addition that reduces Mn and Cr, adding V by only adding.So,, importantly want compound interpolation about Mn, Cr and V.
According to above viewpoint, according to non-tempering seamless steel tube of the present invention, it is characterized in that: % by weight, contain that C:0.10%～0.20% (being lower than), Si:0.05%～1.0%, Mn:0.5%～2.5%, P:0.03% are following, S:0.05% is following, Cr:0.5%～1.5%, V:0.03%～0.3%, Al:0.003%～0.10%, N:0.001%～0.02%, below the o:0.003%, surplus is made of Fe and impurity, and the carbon equivalent Cep. (%) that defines by following formula is 0.60%～0.85%.
Ceq.＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
Also part Fe can be replaced as more than a kind or 2 kinds of selection from Ni:0.05%～1.5%, Mo:0.05%～1.5%, Cu:0.05%～1.5%, B:0.0003%～0.01%.
Or, also part Fe can be replaced as a kind or 2 kinds that from Ti:0.005%～0.2%, Nb:0.005%～0.2%, selects.
In addition, also part Fe can be replaced as more than a kind or 2 kinds of selection from Ni:0.05%～1.5%, Mo:0.05%～1.5%, Cu:0.05%～1.5%, B:0.0003%～0.01%, reach a kind or 2 kinds that from Ti:0.005%～0.2%, Nb:0.005%～0.2%, selects.
The reason of above-mentioned qualification below is described.
C:0.10%～0.20% (being lower than)
C is the element of gaining in strength, but also is the element that reduces weldability.Therefore, guarantee toughness and weldability, the C amount need be controlled at and be lower than 0.20% in high intensity level.If consider that from toughness and weldability aspect the C amount is low more good more, still,, be difficult to proof strength if be lower than 0.10%.For the foregoing reasons, the C amount is limited to 0.10%～0.20% (being lower than).From guaranteeing best intensity-toughness equilibrated angle consideration, preferably the C amount is controlled at 0.13%～0.17% scope.
Si：0.05％～1.0％
Si has the effect that improves intensity as reductor simultaneously.But, if be lower than 0.05%, can not get its effect, if opposite, reduce toughness above 1.0%.For the foregoing reasons, the Si amount is limited to 0.05%～1.0% scope.From guaranteeing best intensity-toughness equilibrated angle consideration, preferably the Si amount is controlled at 0.1%～0.4% scope.
Mn：0.5％～2.5％
Mn is in the steel that has reduced C, by with the compound in the lump interpolation of Cr, V, can not reduce the element of gaining in strength under the flexible situation.In addition, if surpass 2.5%, reduce weldability and toughness.For the foregoing reasons, the Mn amount is limited in 0.5%～2.5% the scope.From guaranteeing best intensity-toughness equilibrated angle consideration, preferably the Mn amount is controlled at 1.5%～2.0% scope.
Below the P:0.03%
P is that denseization finally solidified near the position when solidifying, and at grain boundary segregation, reduces hot workability or flexible impurity element.Therefore, preferably reduce its amount as far as possible.But owing to can allow 0.03%, so the amount of P is set in below 0.03%.But, for further guaranteeing high tenacity, preferably below 0.02%, more preferably below 0.01%.
Below the S:0.05%
S and P are same, are when solidifying, and at grain boundary segregation, reduce hot workability or flexible impurity element.Therefore, preferably reduce its amount as far as possible.But owing to can allow 0.05%, so the amount of P is set in below 0.05%.But, if undue the reduction, owing to reduce machinability, so the lower value of the S when paying attention to machinability preferably sets 0.01%.In addition, comparing with machinability when more paying attention to toughness, the S amount is preferably below 0.02%, more preferably below 0.01%.
Cr：0.5％～1.5％
Cr is in the steel that has reduced C, by with the compound in the lump interpolation of Cr, V, can not reduce the element of gaining in strength under the flexible situation.Be the intensity of guaranteeing to stipulate, need the amount more than 0.5%.In addition, if surpass 1.5%, reduce weldability and toughness.For the foregoing reasons, the Cr amount is limited to 0.5%～1.5% scope.From guaranteeing best intensity-toughness equilibrated angle consideration, preferably the Cr amount is controlled at 0.9%～1.4% scope.
V：0.03％～0.3％
Because V separates out fine vanadium carbide, gains in strength, so just add V.If with the compound in the lump interpolation of Cr, V, can be in the high-intensity reduction toughness that suppresses simultaneously.Obtain this effect, need to add more than 0.03%.In addition, if surpass 0.3%, owing to reduce toughness, so, the V amount is limited in 0.03%～0.3% the scope.From guaranteeing best intensity-toughness equilibrated angle consideration, preferably the V amount is controlled at 0.05%～0.15% scope.
Al：0.003％～0.10％
Al has the effect as reductor.Obtain this effect, need the amount more than 0.003%.If surpass 0.10%, increase the alumina series inclusion, easily produce surface imperfection.For the foregoing reasons, the Al amount is limited to 0.003%～0.10% scope.In addition, for guaranteeing stable surface quality, preferred 0.003%～0.05% scope.
N：0.001％～0.02％
N and Al, Ti coexistence can make the crystal grain miniaturization, have the effect of the flexible of raising.But if be lower than 0.001%, its effect is little, if surpass 0.02%, reduces toughness on the contrary.For the foregoing reasons, the N amount is limited to 0.001%～0.02% scope.
Below the O:0.003%
If O surpasses 0.003%, reduce toughness and fatigue strength.Therefore, the O amount is set in below 0.003%.
From Ni:0.05%～1.5%, Mo:0.05%～1.5%, Cu:0.05%～1.5%, B:0.0003%～0.01%, select more than a kind or 2 kinds
Ni, Mo, Cu, B are to improve the element that drawability increases hardness of steel, as required, can add more than a kind or 2 kinds.When adding, more than 0.05%, more than 0.0003%, can bring into play effect for B for Ni, Mo, Cu.In addition, for Ni, Mo, Cu, surpass 1.5% if add, the effect that Ni improves intensity is saturated, also increases cost simultaneously, and Mo reduces weldability, toughness, and Cu reduces hot workability.Therefore, the higher limit of Ni, Mo, Cu is set in 1.5% respectively.If B add to surpass 0.01% owing to reduce toughness, so with 0.01% as the upper limit.
From Ti:0.005%～0.2%, Nb:0.005%～0.2%, select more than a kind or 2 kinds
Ti, Nb are to form carbide, make and organize miniaturization, thereby improve toughness, gain in strength by separating out in matrix simultaneously, help the element of high strength.Therefore, as required, can add a kind or 2 kinds in above-mentioned.In addition, surpass 0.2%, reduce toughness if add.For the foregoing reasons, its scope all is limited to 0.005%～0.2% scope.
Carbon equivalent Cep. (%): 0.60%～0.85%.
Ceq.＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
Alloying element is respectively by quality % definition.Except that the qualification that above-mentioned one-tenth is grouped into, the angle of intensity, toughness and weldability that collateral security is good is considered, preferably Ceq. is limited to 0.60%～0.85% scope.If Ceq. is lower than 0.60%, can not guarantee intensity, if Ceq. surpasses 0.85%, reduce toughness, be easy to generate welding crack simultaneously.In addition, consider from high-intensity angle, preferred 0.60%～0.85%, more preferably 0.70%～0.85%.
Surplus is Fe and impurity.
In impurity,, can contain Ca, Mg, REM (rare earth metal) respectively with 0.01% as the upper limit.These elements do not have big influence to intensity, toughness and weldability, but when casting, particularly when casting round ingot, add sometimes, to prevent to stop up the nozzle of tundish yet.If the amount of these elements surpasses 0.01%, surface texture worsens, and reduces yield rate.So,, also can contain 0.01% respectively by the upper limit as impurity.
According to weldless steel tube of the present invention, can be by following manufacturing.That is,, adopt continuous metal cast process or ingot bar method to solidify with the steel of converter, electric furnace or the above-mentioned composition of vacuum melting furnace melting.Direct or piecemeal formation steel tube blank in the manufacturing process through common weldless steel tube, behind the formation steel pipe, obtains weldless steel tube by air cooling with this coagulum.
Cooling after the hot rolling preferably utilizes nature to put cold air cooling, but also can implement air blast warm cooling or air-cooled (the giving some wind, Yi Bian cool off) of (cover on one side use windshield cover, while cool off) etc.
Embodiment
The steel of the chemical constitution shown in the melting table 1, cast ingot after, make steel billet through forging, above-mentioned steel billet is heated to 1250 ℃, with Mannesmann core rod type slitless tube mill tubing, form the weldless steel tube of external diameter 150mm * wall thickness 24.2mm.After rolling, the above-mentioned steel pipe of air cooling.With the state of tubing own, investigated the mechanical property (impact characteristics of tensile properties, employing summer coomb's test Coomb) and the welding crack of above-mentioned steel pipe.
In addition, welding crack according to JIS Z3158 " test of Y shape welding crack ", adopts the coating electric welding method of hot 20kJ/cm to weld, and investigation has flawless.Above-mentioned test-results is shown in table 1 with also contrasting.In table 1, TS (MPa) represents intensity.In addition, 2uE20 (J), as toughness index, expression can be worth based on the Xia Shi of JIS Z2202 and JIS Z2242 is disrumpent feelings, and is corresponding with respect to the disrumpent feelings Energy value of Xia Shi (J) of 20 ℃ of tests of the U notched specimen of 2mm with employing.
Table 1
| The sample sequence number | ???C | ???Si | ???Mn | ???P | ???S | ???Cr | ???V | ???Al | ?????N | ????O | ???Ni | ???Mo | ???Cu | ?????B | ???Ti | ????Nb | ??Ceq.(％) | ??TS(MPa) | ??2uE20(J) | Flawless is arranged | |
| Example | ????1 | ??0.15 | ??0.19 | ??1.80 | ??0.015 | ??0.020 | ??1.20 | ??0.10 | ??0.019 | ??0.0011 | ??0.0020 | ????0.71 | ????843 | ????54 | ????○ | ||||||
| ????2 | ??0.15 | ??0.35 | ??1.71 | ??0.011 | ??0.012 | ??1.31 | ??0.14 | ??0.016 | ??0.0061 | ??0.0019 | ????0.73 | ????878 | ????68 | ????○ | |||||||
| ????3 | ??0.17 | ??0.29 | ??1.65 | ??0.013 | ??0.025 | ??0.98 | ??0.07 | ??0.015 | ??0.0055 | ??0.0008 | ????0.66 | ????756 | ????66 | ????○ | |||||||
| ????4 | ??0.14 | ??0.32 | ??1.74 | ??0.014 | ??0.018 | ??1.19 | ??0.12 | ??0.017 | ??0.0034 | ??0.0007 | ????0.69 | ????823 | ????64 | ????○ | |||||||
| ????5 | ??0.13 | ??0.38 | ??1.89 | ??0.010 | ??0.013 | ??0.91 | ??0.05 | ??0.023 | ??0.0057 | ??0.0010 | ????0.67 | ????719 | ????58 | ????○ | |||||||
| ????6 | ??0.13 | ??0.13 | ??1.76 | ??0.014 | ??0.025 | ??1.37 | ??0.12 | ??0.025 | ??0.0021 | ??0.0007 | ????0.76 | ????857 | ????60 | ????○ | |||||||
| ????7 | ??0.13 | ??0.35 | ??1.60 | ??0.010 | ??0.023 | ??1.38 | ??0.06 | ??0.024 | ??0.0180 | ??0.0011 | ????0.70 | ????768 | ????63 | ????○ | |||||||
| ????8 | ??0.17 | ??0.16 | ??1.86 | ??0.013 | ??0.022 | ??1.26 | ??0.07 | ??0.017 | ??0.0091 | ??0.0013 | ????0.75 | ????886 | ????53 | ????○ | |||||||
| ????9 | ??0.12 | ??0.28 | ??1.97 | ??0.013 | ??0.015 | ??1.02 | ??0.14 | ??0.017 | ??0.0020 | ??0.0005 | ????0.77 | ????873 | ????66 | ????○ | |||||||
| ????10 | ??0.13 | ??0.39 | ??1.96 | ??0.013 | ??0.021 | ??0.95 | ??0.10 | ??0.018 | ??0.0058 | ??0.0015 | ????0.67 | ????788 | ????66 | ????○ | |||||||
| ????11 | ??0.15 | ??0.10 | ??1.56 | ??0.013 | ??0.008 | ??1.24 | ??0.08 | ??0.021 | ??0.0076 | ??0.0004 | ??0.50 | ????0.67 | ????759 | ????61 | ????○ | ||||||
| ????12 | ??0.16 | ??0.34 | ??1.53 | ??0.011 | ??0.008 | ??1.22 | ??0.13 | ??0.019 | ??0.0096 | ??0.0016 | ??0.20 | ????0.69 | ????765 | ????62 | ????○ | ||||||
| ????13 | ??0.12 | ??0.23 | ??1.91 | ??0.012 | ??0.023 | ??1.15 | ??0.13 | ??0.020 | ??0.0076 | ??0.0001 | ??0.10 | ??0.15 | ????0.72 | ????802 | ????58 | ????○ | |||||
| ????14 | ??0.13 | ??0.33 | ??1.50 | ??0.014 | ??0.015 | ??1.48 | ??0.11 | ??0.022 | ??0.0010 | ??0.0004 | ??0.0031 | ????0.78 | ????878 | ????57 | ????○ | ||||||
| ????15 | ??0.16 | ??0.21 | ??1.70 | ??0.013 | ??0.019 | ??0.91 | ??0.12 | ??0.021 | ??0.0042 | ??0.0009 | ??0.42 | ??0.31 | ????0.68 | ????757 | ????64 | ????○ | |||||
| ????16 | ??0.17 | ??0.36 | ??1.91 | ??0.014 | ??0.016 | ??1.21 | ??0.12 | ??0.017 | ??0.0044 | ??0.0010 | ??0.015 | ????0.75 | ????861 | ????64 | ????○ | ||||||
| ????17 | ??0.17 | ??0.36 | ??1.65 | ??0.014 | ??0.006 | ??1.46 | ??0.14 | ??0.022 | ??0.0070 | ??0.0019 | ??0.021 | ????0.77 | ????868 | ????62 | ????○ | ||||||
| ????18 | ??0.17 | ??0.35 | ??1.69 | ??0.011 | ??0.023 | ??1.26 | ??0.11 | ??0.020 | ??0.0071 | ??0.0004 | ??0.009 | ??0.018 | ????0.73 | ????832 | ????69 | ????○ | |||||
| ????19 | ??0.16 | ??0.23 | ??1.90 | ??0.014 | ??0.008 | ??1.01 | ??0.11 | ??0.021 | ??0.0045 | ??0.0011 | ??0.45 | ??0.012 | ????0.73 | ????833 | ????57 | ????○ | |||||
| ????20 | ??0.14 | ??0.28 | ??1.78 | ??0.012 | ??0.023 | ??0.92 | ??0.10 | ??0.022 | ??0.0080 | ??0.0015 | ??0.53 | ??0.22 | ??0.007 | ??0.02 | ????0.72 | ????806 | ????53 | ????○ | |||
| ????21 | ??0.16 | ??0.37 | ??1.73 | ??0.012 | ??0.007 | ??1.03 | ??0.14 | ??0.019 | ??0.0038 | ??0.0019 | ??0.15 | ??0.0009 | ??0.025 | ????0.71 | ????786 | ????54 | ????○ | ||||
| Comparative example | ????22 | ??0.45 | ??0.11 | ??1.00 | ??0.011 | ??0.024 | ??0.70 | ??0.05 | ??0.023 | ??0.0066 | ??0.0014 | ????0.77 | ????856 | ????9 | ????× | ||||||
| ????23 | ??0.41 | ??0.25 | ??0.60 | ??0.010 | ??0.007 | ??0.90 | ??0.15 | ??0.024 | ??0.0051 | ??0.0005 | ??0.13 | ????0.73 | ????788 | ????13 | ????× | ||||||
| ????24 | ??0.17 | ??0.30 | ??1.95 | ??0.014 | ??0.019 | ??1.49 | ??- | ??0.018 | ??0.0068 | ??0.0004 | ????0.79 | ????893 | ????25 | ????○ | |||||||
| ????25 | ??0.16 | ??0.11 | ??2.48 | ??0.014 | ??0.012 | ??- | ??0.27 | ??0.020 | ??0.0078 | ??0.0018 | ????0.63 | ????725 | ????24 | ????○ | |||||||
| ????26 | ??0.19 | ??0.27 | ??0.46 | ??0.010 | ??0.014 | ??1.48 | ??0.28 | ??0.016 | ??0.0033 | ??0.0010 | ????0.62 | ????722 | ????26 | ????○ | |||||||
| ????27 | ??0.15 | ??0.31 | ??2.35 | ??0.010 | ??0.020 | ??1.40 | ??- | ??0.015 | ??0.0089 | ??0.0005 | ??0.11 | ??0.0011 | ??0.021 | ????0.84 | ????913 | ????22 | ????○ | ||||
| ????28 | ??0.11 | ??0.26 | ??0.61 | ??0.010 | ??0.006 | ??0.57 | ??0.04 | ??0.017 | ??0.0086 | ??0.0019 | ????0.33 | ????580 | ????86 | ????○ |
In the table 1, sample sequence number 1～21st, example of the present invention, tensile strength is minimum also will to surpass 700MPa, is up near 900MPa.So, even high strength also can be guaranteed in addition, welding crack not to take place yet more than 50J with the toughness of impact value evaluation.
Sample sequence number 22～28th, comparative example.Sample the 22, the 23rd forms the example of the middle carbon set member of ferritic-pearlitic steel in the past.At this moment, though can guarantee intensity, produce welding crack.In addition, sample 24～27th, not compound interpolation Mn, Cr, V or off-limits example.Do not cause welding crack, but the toughness deficiency.Sample 28 is though be to satisfy the composition compositing range, the example that carbon equivalent Ceq. is low.Intensity descends significantly from 700MPa, can not be used for the purposes of high strength seamless steel pipe.
As mentioned above, if adopt the present invention, even tubulation degree of finish or tubulation temperature not in the strict regulation process also can be taken into account high strength and toughness, and can access the non-tempering seamless steel tube that can guarantee good welds.
Claims (4)
1. non-tempering seamless steel tube is characterized in that:
% by weight, contain: C:0.10%～be lower than 0.20%, Si:0.05%～1.0%, Mn:0.5%～2.5%, P:0.03% is following, S:0.05% is following, Cr:0.5%～1.5%, V:0.03%～0.3%, Al:0.003%～0.10%, N:0.001%～0.02%, below the O:0.003%;
Surplus is made of Fe and impurity;
Carbon equivalent Cep. (%) by the following formula definition is 0.60%～0.85%,
Ceq.＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15。
2. non-tempering seamless steel tube as claimed in claim 1 is characterized in that:
Part Fe is replaced as more than a kind or 2 kinds of selection from Ni:0.05%～1.5%, Mo:0.05%～1.5%, Cu:0.05%～1.5%, B:0.0003%～0.01%.
3. non-tempering seamless steel tube as claimed in claim 1 is characterized in that:
Part Fe is replaced as a kind or 2 kinds that selects from Ti:0.005%～0.2%, Nb:0.005%～0.2%.
4. non-tempering seamless steel tube as claimed in claim 1 is characterized in that:
Part Fe is replaced as more than a kind or 2 kinds of selection from Ni:0.05%～1.5%, Mo:0.05%～1.5%, Cu:0.05%～1.5%, B:0.0003%～0.01%, reaches a kind or 2 kinds that from Ti:0.005%～0.2%, Nb:0.005%～0.2%, selects.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003084410A JP3969328B2 (en) | 2003-03-26 | 2003-03-26 | Non-tempered seamless steel pipe |
| JP2003084410 | 2003-03-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1532300A true CN1532300A (en) | 2004-09-29 |
| CN1240867C CN1240867C (en) | 2006-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200410030007.4A Expired - Fee Related CN1240867C (en) | 2003-03-26 | 2004-03-17 | Non quenched and tempered seamless steel pipe |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20040238075A1 (en) |
| JP (1) | JP3969328B2 (en) |
| CN (1) | CN1240867C (en) |
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2004
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2004292857A (en) | 2004-10-21 |
| US20040238075A1 (en) | 2004-12-02 |
| CN1240867C (en) | 2006-02-08 |
| JP3969328B2 (en) | 2007-09-05 |
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