CN102011055A - Method for manufacturing hard bainite bearing - Google Patents
Method for manufacturing hard bainite bearing Download PDFInfo
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- CN102011055A CN102011055A CN 201010583521 CN201010583521A CN102011055A CN 102011055 A CN102011055 A CN 102011055A CN 201010583521 CN201010583521 CN 201010583521 CN 201010583521 A CN201010583521 A CN 201010583521A CN 102011055 A CN102011055 A CN 102011055A
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- 229910001563 bainite Inorganic materials 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
- 239000010959 steel Substances 0.000 claims abstract description 47
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000011282 treatment Methods 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- 239000004411 aluminium Substances 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 6
- 239000001257 hydrogen Substances 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- 238000005255 carburizing Methods 0.000 claims description 17
- 238000009413 insulation Methods 0.000 claims description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 14
- 229910052804 chromium Inorganic materials 0.000 claims description 13
- 239000011651 chromium Substances 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 239000004615 ingredient Substances 0.000 claims description 6
- 239000007858 starting material Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 238000007669 thermal treatment Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 238000005242 forging Methods 0.000 claims description 2
- 229910000734 martensite Inorganic materials 0.000 abstract description 8
- 238000010791 quenching Methods 0.000 abstract description 8
- 230000000171 quenching effect Effects 0.000 abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 4
- 239000005864 Sulphur Substances 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 229910000851 Alloy steel Inorganic materials 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000005482 strain hardening Methods 0.000 abstract 1
- 238000005496 tempering Methods 0.000 abstract 1
- 230000003245 working effect Effects 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- Rolling Contact Bearings (AREA)
Abstract
The invention relates to a method for manufacturing a hard bainite bearing. Pure low carbon low alloy steel is adopted, oxygen and hydrogen contents are 5ppm and less than 0.5ppm respectively, phosphor and sulphur contents are less than 0.005wt% respectively, and carbon content is 0.15-0.22wt%, and aluminium content is 1.0-1.2wt%; and the manufacturing process comprises: raw materials is subject to plastic hot working, and then mechanical cold working is carried out, thus obtaining a bearing; carburization is carried out on the surface of the bearing; and then normalizing, austenitizing, quenching, cold treatment, tempering and other heat treatments are carried out on the bearing. The center part of the product manufactured by the method is in a low carbon tempered martensite structure, and the surface is a long-life bearing in a high carbon hard bainite structure. The bearing provided by the invention has stable dimensions when in use. Under the condition of high stress, the service life of the bear provided by the invention is improved by more than twice compared with a GCr15 steel bearing which is widely applied at present.
Description
Technical field the present invention relates to a kind of heat treating method of ferrous materials.
Background technology is well-known, and bearing is the key foundation part in the mechanical means, and it should have good wear resistance, possess high anti-contact fatigue property again, and the quality of bearing quality is directly connected to the work-ing life of entire equipment.And the quality of bearing quality depends on bearing materials and thermal treatment process thereof to a great extent.At present, bearing steel commonly used has chromium bearing steel, Chrome-free bearing steel, stainless bearing steel, high-temperature bearing steel and carburizing bearing steel.Wherein, the typical steel grade in the chromium bearing steel is GCr15, is to use a kind of widely bearing steel, is used to make middle-size and small-size bearing and part large size bearing.Higher manganese and silicone content are arranged among GCr9SiMn and the GCr15SiMn, improved hardening capacity, GCr15SiMn can be used for the large-scale and extra large size bearing of fabrication portion.The thermal treatment commonly used of chromium bearing steel when producing precision bearing and measurer with the chromium bearing steel, can not thoroughly be eliminated internal stress and residual austenite for low-temperaturetempering for quenching and low-temperaturetempering, and workpiece can deform in prolonged preservation or use.For avoiding this situation to take place, need carry out comparatively complicated heat treatment.The Chrome-free bearing steel is the multicomponent alloy bearing steel that developed afterwards, and wherein often contains alloying elements such as silicon, manganese, molybdenum, vanadium, for example GSiV, GMnMoV, GSiMnMoV etc.Because of the acting in conjunction of alloying element, the hardening capacity of this type of steel is all higher.Can obtain high rigidity uniformly behind the parts quenching, wear resistance, contact fatigue drag and toughness, and also the quenching strain tendency is little, and temper resistance is good.But also exist decarburization susceptibility big, the higher and solidity to corrosion of annealing hardness is not as the problem of chromium bearing steel.Stainless bearing steel adapts to industrial development such as chemistry, oil, shipbuilding and develops.The bearing of working in various corrosive environments must have high corrosion resisting property, and the bearing steel of general chrome content is not competent, has therefore developed the high carbon and chromium stainless bearing steel.Chromium is the main alloy element of this type of steel, as 9Cr18,9Cr18Mo etc.Its weak point is that range of application has limitation.Bearing in the devices such as aircraft engine, aerospacecraft, internal combustion turbine is worked under high temperature and high speed and high-load condition, its working temperature is more than 300 ℃, the maximum operating temperature of GCr15 steel is no more than 180 ℃, the working temperature of the low-alloy bearing steel of siliceous, molybdenum, vanadium, aluminium also can only be below 250 ℃, if temperature raises again, then can cause hardness sharply to descend and lost efficacy.The bearing of therefore under comparatively high temps, working, should adopt have sufficiently high hot hardness, high temperature abrasion resistance, high temperature contact fatigue strength and high performance bearing steel such as anti-oxidant.The high-temperature bearing steel has two classes at present: rapid steel class bearing steel (as W18Cr4V) and high martensitic chromium stainless steel (as Cr14Mo4V).Its weak point is the price comparison height.Carburizing bearing steel is mainly used in large-scale (external diameter is greater than 250mm) or super-huge (external diameter is greater than 450mm) bearing of making on heavy mill, generator and the mining machinery.The size of these bearings is very big, under high contact stress, work, experience a shock continually and wear and tear, therefore to large size bearing except that the requirement that should have to general bearing, also require heart portion that enough toughness and high ultimate compression strength and hardness are arranged, so select for use the alloy carburizing steel of low-carbon (LC) to make.After carburizing and quenching and low-temperaturetempering, the top layer hard wear resistant, heart portion keeps high obdurability, and the surface is in compressive stress state simultaneously, and is favourable to improving fatigue lifetime.Carburizing bearing steel commonly used has G20CrMo, G20CrNiMo, G20CrNi 2Mo, G20Cr2Ni4 and G20Cr2Mn2Mo etc.Its weak point is the price comparison height.
Summary of the invention the object of the present invention is to provide that a kind of thermal treatment is simple, decarburization susceptibility is little, annealing hardness is moderate, corrosion-resistant, hard bainite bearing manufacture method that price is low.The present invention mainly is that to be processed into the top layer be that hard bainite structure, heart portion are the high-performance bearing of low-carbon (LC) tempered martensite for the bearing that adopts carburizing treatment method and special heat treating method will have certain chemical ingredients.
Hard bainite is a high-carbon content carbide-free Bainite ferritic structure, and it is very tiny by obtaining the substructure size in the Ms point temperature isothermal quenching a little more than material, and does not have the bainite structure of carbide.It has the hardness of quenched martensite tissue and the toughness of quenched and tempered organization.
Technical scheme of the present invention is:
1, the starting material of bearing: the pure 20CrAl steel that adopts the preparation of vacuum metling and vacuum consumable electroslag technology, the chemical ingredients of this 20CrAl is: carbon content is that 0.15～0.22wt%, aluminium content are 1.0～1.2wt%, chromium content is 1.2～2.0wt%, and p and s content is respectively all less than 0.005wt%; Contain that oxygen and hydrogen content are respectively 5ppm and below the 0.5ppm, all the other are iron.Big for size, require the higher bearing of hardening capacity, can in the 20CrAl component steel, add Ni, Mo or elements such as w, Dui Ying steel is 20CrMoAl or 20CrWAl or 20CrNiMoAl or 20CrNiWAl steel with it, and molybdenum content＜0.5wt%, nickel content＜0.5wt%, W content＜1.0wt%.
2, adopt conventional forging or rolling starting material are carried out plasticity hot-work.
3, mechanical workout bearing: the hot worked material of above-mentioned plasticity is carried out machinery be cold worked into bearing.
4, bearing surface is carried out carburizing treatment: above-mentioned bearing was heated to 920～950 ℃, carburizing 200～300 minutes, and carburizing rear bearing carbon contents is 0.9～1.2wt%, case depth 1.0～1.5mm.
5, the thermal treatment of bearing:
A, above-mentioned bearing is heated to 900～930 ℃ of insulations 60～120 minutes, carries out normalizing treatment, to eliminate carbide network;
B, above-mentioned bearing is heated to 860～880 ℃ of insulations 60～120 minutes, carries out austenitizing and handle, carry out means of isothermal quenching at 200～300 ℃ of insulation 30～200min then;
C, with above-mentioned bearing air cooling to room temperature, keep carrying out in 30～90 minutes deepfreeze at-100～-50 ℃;
D, with above-mentioned bearing be heated to 150～250 ℃ the insulation 60～120min carry out temper.
Method of the present invention compared with prior art has following advantage: product of the present invention has guaranteed the through hardening performance of bearing on the one hand, make it to obtain martensitic stucture through the back heart portion of quenching, the top layer that has guaranteed bearing on the other hand is easy to obtain bainite structure, and bainite should be a carbide-free Bainite.This helps improving the anti-rolling contact fatigue performance of bearing.This bearing fertile material structural state is a tempered martensite, and it has kept conventional mechanical properties such as the pulling force of tempered martensite and impact.The rolling contact fatigue life that top layer of the present invention has the hard bainite structure bearing is more than 3 times of traditional GCr15 steel bearing fatigue life.Utilize friction wear testing machine to test the friction and wear behavior of this hard bainite structure, find that its friction and wear behavior is more than 3 times of traditional GCr15 steel.In other words: obtain heart portion's tempered martensite and the surface is the high-performance bearing of ultra-fine bainite structure, such bearing is dimensional stabilizing in use, under condition of high ground stress, its work-ing life, the traditional GCr15 steel bearing fatigue life than present widespread use improved more than 2 times.
Embodiment
Embodiment 1
Adopt the pure 20CrAl steel of vacuum metling and vacuum consumable electroslag technology preparation, the weight percent of its chemical ingredients is: carbon content is 0.15%, aluminium content is 1.08%, chromium content is 1.26%, phosphorus content is 0.0009%, sulphur content is 0.003%, oxygen level is 4ppm, and hydrogen content is 0.4ppm, and all the other are iron.Above-mentioned starting material are forged plasticity hot-work, the hot worked material of above-mentioned plasticity is carried out machinery be cold worked into bearing.Above-mentioned bearing is heated to 945 ℃ of carburizings 300 minutes, and carburizing rear bearing carbon contents is 1.2wt%, case depth 1.4mm.Behind the air cooling above-mentioned bearing is heated to 930 ℃ and is incubated 115 minutes normalizing treatment; And then be heated to 880 ℃ of insulations 110 minutes, placing temperature then is 290 ℃ salt made from earth containing a comparatively high percentage of sodium chloride insulation 100 minutes; Above-mentioned bearing air cooling to room temperature, is placed temperature to be-95 ℃ again and kept 90 minutes; At last with above-mentioned bearing reheat to 240 ℃ insulation 60 minutes.The product subsurface hardness of the present invention that obtains is HRC63, and centre hardness is HRC43, and this bearing is applied in the coal handling system of harbour, and improve 80% or more than common GCr15 steel bearing its work-ing life.
Embodiment 2
Adopt the pure 20CrMoAl steel of vacuum metling and vacuum consumable electroslag technology preparation, the weight percent of its chemical ingredients is: carbon content is 0.19%, aluminium content is 1.0%, chromium content is 1.85%, molybdenum content is 0.45%, phosphorus content is 0.003%, and sulphur content is 0.002%, and oxygen level is 4.5ppm, hydrogen content is 0.3ppm, and all the other are iron.Above-mentioned starting material are rolled plasticity hot-work, the hot worked material of above-mentioned plasticity are carried out machinery be cold worked into bearing.Above-mentioned bearing is heated to 935 ℃ of carburizings 200 minutes, and carburizing rear bearing carbon contents is 1.05wt%, case depth 1.2mm.Behind the air cooling above-mentioned bearing is heated to 920 ℃ and is incubated 80 minutes normalizing treatment; And then be heated to 870 ℃ of insulations 80 minutes, in 220 ℃ fluidized particle cold bed, be incubated 180 minutes then; Above-mentioned bearing air cooling to room temperature, is placed temperature to be-70 ℃ again and kept 60 minutes; At last with above-mentioned bearing reheat to 200 ℃ insulation 80 minutes.The product subsurface hardness of the present invention that obtains is HRC64, and centre hardness is HRC47, the coal mine machinery heavy-duty bearing that the present invention makes, and improve 1 times or more than common GCr15 steel bearing its work-ing life.
Embodiment 3
Adopt the pure 20CrNiWAl steel steel of vacuum metling and vacuum consumable electroslag technology preparation, the weight percent of its chemical ingredients is: carbon content is 0.18%, aluminium content is 1.18%, chromium content is 1.55%, W content is 0.79%, and nickel content is 0.41%, and phosphorus content is 0.005%, sulphur content is 0.0013%, oxygen level is 4ppm, and hydrogen content is 0.3ppm, and all the other are iron.Above-mentioned starting material are forged plasticity hot-work, the hot worked material of above-mentioned plasticity is carried out machinery be cold worked into bearing.Above-mentioned bearing is heated to 925 ℃ of carburizings 220 minutes, and carburizing rear bearing carbon contents is 0.92wt%, case depth 1.1mm.Behind the air cooling above-mentioned bearing is heated to 910 ℃ and is incubated 65 minutes normalizing treatment; And then be heated to 860 ℃ of insulations 65 minutes, placing temperature then is 230 ℃ salt made from earth containing a comparatively high percentage of sodium chloride insulation 40 minutes; Above-mentioned bearing air cooling to room temperature, is placed temperature to be-80 ℃ again and kept 40 minutes; At last with above-mentioned bearing reheat to 160 ℃ insulation 70 minutes.The product subsurface hardness of the present invention that obtains is HRC62, and centre hardness is HRC43, the large size bearing that the present invention makes, and improve 1 times or more than common GCr15 steel bearing its work-ing life.
Claims (2)
1. hard bainite bearing manufacture method is characterized in that:
(1) the pure 20CrAl steel that adopts vacuum metling and vacuum consumable electroslag technology to prepare, the weight percent of its chemical ingredients is: carbon content is 0.15～0.22%, aluminium content is 1.0～1.2%, chromium content is 1.2～2.0%, p and s content is respectively all less than 0.005%, contain that oxygen and hydrogen content are respectively 5ppm and below the 0.5ppm, all the other are iron;
(2) adopt conventional forging or rolling starting material are carried out plastic working;
(3) the hot worked material of above-mentioned plasticity is carried out machinery and be cold worked into bearing;
(4) above-mentioned bearing is heated to 920～950 ℃, carburizing 200～300 minutes, carburizing rear bearing carbon contents is 0.9～1.2wt%, case depth 1.0～1.5mm;
(5) thermal treatment of bearing:
A, with above-mentioned bearing be heated to 900～930 ℃ the insulation 60～120 minutes, carry out normalizing treatment;
B, with above-mentioned bearing be heated to 860～880 ℃ the insulation 60～120 minutes, then 200～300 ℃ the insulation 30～200 minutes;
C, with above-mentioned bearing air cooling to room temperature, kept 30～90 minutes at-100～-50 ℃;
D, with above-mentioned bearing be heated to 150～250 ℃ the insulation 60～120min.
2. hard bainite bearing manufacture method according to claim 1, it is characterized in that: in the 20CrAl component steel, add Ni, Mo or W element, Dui Ying steel is 20CrMoAl or 20CrWAl or 20CrNiMoAl or 20CrNiWAl steel with it, and molybdenum content＜0.5wt%, nickel content＜0.5wt%, W content＜1.0wt%.
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| CN 201010583521 CN102011055B (en) | 2010-12-10 | 2010-12-10 | Method for manufacturing hard bainite bearing |
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| CN 201010583521 CN102011055B (en) | 2010-12-10 | 2010-12-10 | Method for manufacturing hard bainite bearing |
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| CN102011055B CN102011055B (en) | 2013-01-30 |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102226254A (en) * | 2011-06-10 | 2011-10-26 | 钢铁研究总院 | High-strength high-toughness anticorrosion high-temperature bearing/pinion steel and preparation method thereof |
| CN102374236A (en) * | 2011-09-13 | 2012-03-14 | 上海斐赛轴承科技有限公司 | Impact-resistant long-life rolling bearing of concrete vibrating rod and manufacturing method thereof |
| CN102744576A (en) * | 2012-07-23 | 2012-10-24 | 南通爱利特机电制造有限公司 | Machining method of elevator safety tongs wedge block |
| CN102953006A (en) * | 2012-10-19 | 2013-03-06 | 燕山大学 | Integral hard bainite bearing steel and manufacture method thereof |
| CN103170802A (en) * | 2013-03-04 | 2013-06-26 | 南京紫薇精密机械有限公司 | Processing method for improving stability of Gcr15 main shaft |
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| WO2004059029A1 (en) * | 2002-12-25 | 2004-07-15 | Aisin Aw Co., Ltd. | Carburized and quenched member and method for manufacture thereof |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226254B (en) * | 2011-06-10 | 2013-03-20 | 钢铁研究总院 | High-strength high-toughness anticorrosion high-temperature bearing/pinion steel and preparation method thereof |
| CN102226254A (en) * | 2011-06-10 | 2011-10-26 | 钢铁研究总院 | High-strength high-toughness anticorrosion high-temperature bearing/pinion steel and preparation method thereof |
| CN102374236A (en) * | 2011-09-13 | 2012-03-14 | 上海斐赛轴承科技有限公司 | Impact-resistant long-life rolling bearing of concrete vibrating rod and manufacturing method thereof |
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| CN111500830B (en) * | 2020-05-28 | 2021-02-26 | 中国矿业大学 | Tempering heat treatment method for carburized part and carburized part |
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