CN103643174A - Antimony scandium-containing high-hardness alloy steel material for bearings and preparation method thereof - Google Patents
Antimony scandium-containing high-hardness alloy steel material for bearings and preparation method thereof Download PDFInfo
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- CN103643174A CN103643174A CN201310558343.5A CN201310558343A CN103643174A CN 103643174 A CN103643174 A CN 103643174A CN 201310558343 A CN201310558343 A CN 201310558343A CN 103643174 A CN103643174 A CN 103643174A
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- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 19
- FGBDHWCTPQKBDF-UHFFFAOYSA-N antimony scandium Chemical compound [Sc].[Sb] FGBDHWCTPQKBDF-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000000463 material Substances 0.000 title abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000007670 refining Methods 0.000 claims abstract description 19
- 238000005266 casting Methods 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 239000011651 chromium Substances 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 238000010792 warming Methods 0.000 claims description 18
- 238000005275 alloying Methods 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 9
- 229910000805 Pig iron Inorganic materials 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 239000011572 manganese Substances 0.000 claims description 6
- 229910021532 Calcite Inorganic materials 0.000 claims description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 3
- NPUJHQNGUMWIMV-UHFFFAOYSA-L dicalcium pentamagnesium [dioxido-[oxo(trioxidosilyloxy)silyl]oxysilyl]oxy-[[dioxido-[oxo(trioxidosilyloxy)silyl]oxysilyl]oxy-oxosilyl]oxy-dioxidosilane dihydroxide Chemical compound [OH-].[OH-].[Mg++].[Mg++].[Mg++].[Mg++].[Mg++].[Ca++].[Ca++].[O-][Si]([O-])([O-])O[Si](=O)O[Si]([O-])([O-])O[Si](=O)O[Si]([O-])([O-])O[Si]([O-])([O-])O[Si](=O)O[Si]([O-])([O-])[O-] NPUJHQNGUMWIMV-UHFFFAOYSA-L 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 3
- 239000010977 jade Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 3
- 229910021392 nanocarbon Inorganic materials 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 229910000077 silane Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 3
- 229960001763 zinc sulfate Drugs 0.000 claims description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 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 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 229910052787 antimony Inorganic materials 0.000 abstract description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052706 scandium Inorganic materials 0.000 abstract description 2
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
An antimony scandium-containing high-hardness alloy steel material for bearings comprises the following chemical element components by mass percent: 0.5-0.7% of carbon, 0.8-1.2% of silicon, 2.4-2.6% of manganese, 0.7-0.9% of chromium, 0.4-0.7% of nickel, 0.08-0.12% of Sb, 0.04-0.07% of Sc, not more than 0.04% of S, not more than 0.04% of P, and the balance of iron. The alloy steel of the invention is added with elements of antimony, scandium, manganese, and the like. The formed alloy steel has high hardness, impact resistance, good wear resistance, and high hardenability, is suitable for various pump bearings, is safe and reliable, and long in service life; The method of the invention partly adopts scrap iron as a raw material; secondary refining is performed; heat treatment temperature after casting is controlled reasonably; raw materials are fed in batches; the alloy quality is more stable and consistent; and the comprehensive mechanical properties are improved. The method of the invention adopts a refining agent in the casting production, which reduces the degree of porosity in casting by 1-2 degrees, and controls the oxide inclusion level at about grade two.
Description
Technical field
The present invention relates to metallic substance preparation field, relate in particular to a kind of bearing with containing antimony scandium high hardness alloy steel and preparation method thereof.
Background technology
The environment of pump valve work is various, badly, very high to the requirement of material, the steel alloy that pump valve is used at present has varied, technology has very much progress, but still have a lot of problems to exist, as wear resistance, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness etc., in a lot of occasions, can't meet the requirement of production, also require further improvement, to enhance productivity, reduce costs, improve security, for high-quality precision and sophisticated technology development provides safeguard, for social development provides power, task is also very arduous.
Summary of the invention
The object of the present invention is to provide a kind of bearing with containing antimony scandium high hardness alloy steel and preparation method thereof, this alloy material has advantages of high rigidity, shock-resistant, wear-resisting, hardening capacity is good.
Technical scheme of the present invention is as follows:
Bearing, with containing an antimony scandium high hardness alloy steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.5-0.7, silicon 0.8-1.2, manganese 2.4-2.6, chromium 0.7-0.9, nickel 0.4-0.7, Sb0.08-0.12, Sc0.04-0.07, S≤0.04, P≤0.04, surplus are iron.
Production method containing antimony scandium high hardness alloy steel for described bearing, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1-2 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, manganese; (2) chromium, Sc; (3) other remaining components; The timed interval that each batch drops into element is 21-24 minute, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 200-210 ℃/h of speed, be warming up to 500-510 ℃, insulation 60-70 minute, with 200-210 ℃/h of speed, be warming up to 700-710 ℃ again, insulation 60-70 minute, with 170-180 ℃/h of speed, be warming up to 890-900 ℃ again, insulation 3-4 hour; With 150-160 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 700-710 ℃ with 200-210 ℃/h of speed, then be cooled to 500-510 ℃ with 150-160 ℃/h of speed, insulation 70-80 minute; With 150-160 ℃/h of speed, be cooled to 220-230 ℃ again, insulation 2-3 hour; With 200-210 ℃/h of speed, be warming up to 300-310 ℃ again, then be cooled to 200-210 ℃ with 150-160 ℃/h of speed, then be warming up to 530-540 ℃ with 180-190 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
Described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 30-34, aluminium hydroxide 2-3, calcite 4-5, zinc sulfate 1-2, medical stone 1-2, montmorillonite 1-2, jade 2-3, Tremoliteor Tremoliteasbestos 3-4, Calcium Fluoride (Fluorspan) 1-2, Sodium Silicofluoride 4-5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain.
Beneficial effect of the present invention
Steel alloy of the present invention is by adding the elements such as antimony, scandium, manganese, and the steel alloy hardness of formation is high, shock-resistant, wear resistance is good, has high hardening capacity, for the bearing of various pumps, safe and reliable, long service life; The present invention uses part scrap iron as raw material, and through secondary refining, rationally controls casting postheat treatment temperature, and throwing raw materials, makes more stable uniform of alloy quality in batches, improves comprehensive mechanical property.Refining agent of the present invention is for Foundry Production, and the degree of porosity obviously improving in yield rate, particularly foundry goods reduces 1-2 degree, can not produce pore at cast(ing) surface, and trapped oxide also obviously reduces, and oxide inclusion is 2 grades of left and right.
Embodiment
Bearing is with containing an antimony scandium high hardness alloy steel, and chemical element composition and mass percent thereof that it contains are: carbon 0.5-0.7, silicon 0.8-1.2, manganese 2.4-2.6, chromium 0.7-0.9, nickel 0.4-0.7, Sb0.08-0.12, Sc0.04-0.07, S≤0.04, P≤0.04, surplus are iron.
Described bearing by the production method containing antimony scandium high hardness alloy steel is:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1.5 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, manganese; (2) chromium, Sc; (3) other remaining components; The timed interval that each batch drops into element is 23 minutes, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 205 ℃/h of speed, be warming up to 505 ℃, be incubated 65 minutes, then be warming up to 705 ℃ with 205 ℃/h of speed, be incubated 650 minutes, then be warming up to 895 ℃ with 175 ℃/h of speed, be incubated 3.5 hours; With 155 ℃/h of speed, be cooled to 605 ℃ again, then be warming up to 705 ℃ with 205 ℃/h of speed, then be cooled to 505 ℃ with 155 ℃/h of speed, be incubated 75 minutes; With 155 ℃/h of speed, be cooled to 225 ℃ again, be incubated 2.5 hours; With 205 ℃/h of speed, be warming up to 305 ℃ again, then be cooled to 205 ℃ with 155 ℃/h of speed, then be warming up to 535 ℃ with 185 ℃/h of speed, be incubated 2.5 hours, take out air cooling and get final product.
Described refining agent by following weight part (kilogram) raw material make: instrument comminuted steel shot 32, aluminium hydroxide 2.5, calcite 4.5, zinc sulfate 1.5, medical stone 1.5, montmorillonite 1.5, jade 2.6, Tremoliteor Tremoliteasbestos 3.5, Calcium Fluoride (Fluorspan) 1.5, Sodium Silicofluoride 4.5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 150 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2.4%, 1.5% nano-carbon powder, after mixing, under 12Mpa, be pressed into base, then, at 930 ℃, calcine 3.5 hours, cooling after, then be ground into 200 order powder, obtain.
Bearing of the present invention by the mechanical property containing antimony scandium high hardness alloy steel is: tensile strength 1298MPa, yield strength 945MPa, unit elongation 13.8%, relative reduction in area 18.2%, impact absorbing energy 52.2J, impelling strength 63.1J/cm2, hardness 294HB.
Claims (4)
1. bearing, with containing an antimony scandium high hardness alloy steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.5-0.7, silicon 0.8-1.2, manganese 2.4-2.6, chromium 0.7-0.9, nickel 0.4-0.7, Sb0.08-0.12, Sc0.04-0.07, S≤0.04, P≤0.04, surplus are iron.
2. bearing use according to claim 1, containing the production method of antimony scandium high hardness alloy steel, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1-2 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, manganese; (2) chromium, Sc; (3) other remaining components; The timed interval that each batch drops into element is 21-24 minute, after feeding intake, stirs.
3. bearing use according to claim 2 is containing the production method of antimony scandium high hardness alloy steel, it is characterized in that: described casting postheat treatment is: first by room temperature, with 200-210 ℃/h of speed, be warming up to 500-510 ℃, insulation 60-70 minute, with 200-210 ℃/h of speed, be warming up to 700-710 ℃ again, insulation 60-70 minute, with 170-180 ℃/h of speed, be warming up to 890-900 ℃ again, insulation 3-4 hour; With 150-160 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 700-710 ℃ with 200-210 ℃/h of speed, then be cooled to 500-510 ℃ with 150-160 ℃/h of speed, insulation 70-80 minute; With 150-160 ℃/h of speed, be cooled to 220-230 ℃ again, insulation 2-3 hour; With 200-210 ℃/h of speed, be warming up to 300-310 ℃ again, then be cooled to 200-210 ℃ with 150-160 ℃/h of speed, then be warming up to 530-540 ℃ with 180-190 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
4. the production method containing antimony scandium high hardness alloy steel for bearing according to claim 2, is characterized in that: described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 30-34, aluminium hydroxide 2-3, calcite 4-5, zinc sulfate 1-2, medical stone 1-2, montmorillonite 1-2, jade 2-3, Tremoliteor Tremoliteasbestos 3-4, Calcium Fluoride (Fluorspan) 1-2, Sodium Silicofluoride 4-5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310558343.5A CN103643174A (en) | 2013-11-12 | 2013-11-12 | Antimony scandium-containing high-hardness alloy steel material for bearings and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310558343.5A CN103643174A (en) | 2013-11-12 | 2013-11-12 | Antimony scandium-containing high-hardness alloy steel material for bearings and preparation method thereof |
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| CN103643174A true CN103643174A (en) | 2014-03-19 |
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| CN201310558343.5A Pending CN103643174A (en) | 2013-11-12 | 2013-11-12 | Antimony scandium-containing high-hardness alloy steel material for bearings and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104338899A (en) * | 2014-10-21 | 2015-02-11 | 黄旭伟 | Stainless steel sand mold casting process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226253A (en) * | 2011-06-10 | 2011-10-26 | 钢铁研究总院 | Carburized bearing steel for high-speed railways and preparation method thereof |
| CN102892910A (en) * | 2010-05-10 | 2013-01-23 | 新日铁住金株式会社 | High-strength steel sheet and method for producing same |
| CN103146879A (en) * | 2013-02-04 | 2013-06-12 | 安徽省繁昌县皖南阀门铸造有限公司 | A steel-making refining agent containing modified montmorillonite powder and its preparation method |
| CN103189536A (en) * | 2010-11-29 | 2013-07-03 | 杰富意钢铁株式会社 | Bearing steel exhibiting excellent machinability after spheroidizing annealing and excellent resistance to hydrogen fatigue after quenching/tempering |
-
2013
- 2013-11-12 CN CN201310558343.5A patent/CN103643174A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102892910A (en) * | 2010-05-10 | 2013-01-23 | 新日铁住金株式会社 | High-strength steel sheet and method for producing same |
| CN103189536A (en) * | 2010-11-29 | 2013-07-03 | 杰富意钢铁株式会社 | Bearing steel exhibiting excellent machinability after spheroidizing annealing and excellent resistance to hydrogen fatigue after quenching/tempering |
| CN102226253A (en) * | 2011-06-10 | 2011-10-26 | 钢铁研究总院 | Carburized bearing steel for high-speed railways and preparation method thereof |
| CN103146879A (en) * | 2013-02-04 | 2013-06-12 | 安徽省繁昌县皖南阀门铸造有限公司 | A steel-making refining agent containing modified montmorillonite powder and its preparation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104338899A (en) * | 2014-10-21 | 2015-02-11 | 黄旭伟 | Stainless steel sand mold casting process |
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Application publication date: 20140319 |