CN104372265A - Powder metallurgy material for stainless steel and preparation method of powder metallurgy material - Google Patents
Powder metallurgy material for stainless steel and preparation method of powder metallurgy material Download PDFInfo
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- CN104372265A CN104372265A CN201410566494.XA CN201410566494A CN104372265A CN 104372265 A CN104372265 A CN 104372265A CN 201410566494 A CN201410566494 A CN 201410566494A CN 104372265 A CN104372265 A CN 104372265A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims abstract description 31
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 24
- 229910001220 stainless steel Inorganic materials 0.000 title abstract description 25
- 239000010935 stainless steel Substances 0.000 title abstract description 22
- 238000005245 sintering Methods 0.000 claims abstract description 47
- 238000002156 mixing Methods 0.000 claims abstract description 34
- 238000000498 ball milling Methods 0.000 claims abstract description 31
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 238000007493 shaping process Methods 0.000 claims description 16
- 229910052759 nickel Inorganic materials 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000641 cold extrusion Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 239000011651 chromium Substances 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 10
- 239000011572 manganese Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- HGPXWXLYXNVULB-UHFFFAOYSA-M lithium stearate Chemical compound [Li+].CCCCCCCCCCCCCCCCCC([O-])=O HGPXWXLYXNVULB-UHFFFAOYSA-M 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- RBVYPNHAAJQXIW-UHFFFAOYSA-N azanylidynemanganese Chemical compound [N].[Mn] RBVYPNHAAJQXIW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Powder Metallurgy (AREA)
Abstract
The invention belongs to the powder metallurgy field and discloses a powder metallurgy material for stainless steel and a preparation method of the powder metallurgy material. The powder metallurgy material comprises the following components: 12.5wt%-18.5wt% of Cr, 8.6%-11.4wt% of Ni, 1.2wt%-2.5wt% of C, 0.3wt%-1.1wt% of Mn, 0.5wt%-1.3wt% of Sb, 0.4wt%-0.7wt% of Se, 0.5wt%-0.9wt% of Si and the balance of Fe. The preparation method of the powder metallurgy material comprises the steps of raw material mixing, raw material ball-milling, forming and pressing, and vacuum sintering, thereby obtaining the powder metallurgy material.
Description
Technical field
The invention belongs to field of powder metallurgy, relate to a kind of mmaterial and preparation method thereof, especially relate to a kind of for stainless mmaterial and preparation method thereof.
Background technology
Stainless steel is often divided into by structural state: martensitic steel, ferritic steel, austenitic steel etc.In addition, can be divided into by composition: Chromium Stainless Steel, chromium nickel stainless steel and chromic manganese nitrogen stainless steel etc.Ferritic stainless steel solidity to corrosion, toughness and weldability improve with the increase of chrome content, and the stress corrosion performance of resistance to muriate is better than other kind stainless steels.Ferritic stainless steel is because chrome content is high, and corrosion resistance nature and antioxidant property are all relatively good, but mechanical property and processing performance poor, be used for stressed little acidproof structure and do Oxidation Resistant Steel use.Austenitic stainless steel: containing chromium more than 18%, also containing about 8% nickel and the element such as a small amount of molybdenum, titanium, nitrogen.Good combination property, can resistant to many dielectric corrosion.Containing a large amount of Ni and Cr in austenitic stainless steel, make steel at room temperature in austenitic state.Austenitic stainless steel has good plasticity, toughness, weldability and corrosion resisting property, and in oxidisability and reductant, solidity to corrosion is all better, is used for making acid-resistant system, as the equipment part etc. of anti-corrosion container and equipment lining, transport pipe, resistance to nitric acid.Martensite Stainless Steel: intensity is high, but plasticity and weldability poor.Martensite Stainless Steel is higher because of carbon containing, therefore has higher intensity, hardness and wear resistance, but solidity to corrosion is slightly poor, and, corrosion resisting property higher for mechanical property requirements requires some general parts, as spring, turbine blade, water pressure engine valve etc.
The stainless material that mmaterial prepares does not have the hardness of above-mentioned martensitic steel, ferritic steel, austenitic steel etc. high usually, but because mmaterial has the special performance being different from above-mentioned stainless material, therefore also have and apply comparatively widely, but the hardness of the stainless material that mmaterial prepares is lower, license notification number is a kind of stainless steel powder metallurgy material disclosed in the patent of 101597712, comprises Cr12 Stainless Steel Powder 68.25%, 440C Stainless Steel Powder 30%, Graphite Powder 99 1.0%, lithium stearate 0.75%.The hardness of this stainless steel powder metallurgy material only has 54.Therefore its lower hardness constrains the application of powder metallurgical stainless steel material.
Summary of the invention
The technical problem solved: stainless steel powder metallurgy material must possess good corrosion resistance nature, the stainless material of some routines possesses very good corrosion resistance nature, but the hardness that stainless material also must be higher, possesses the working strength that higher hardness can ensure stainless material, and the hardness of the stainless steel mmaterial of routine is lower, therefore need a kind of newly for stainless mmaterial and preparation method thereof.
Technical scheme: for above-mentioned technical problem, the invention discloses a kind of for stainless mmaterial and preparation method thereof; The described composition comprising following weight for stainless mmaterial:
Cr 12.5wt%-18.5wt%、
Ni 8.6wt%-11.4wt%、
C 1.2wt%-2.5wt%、
Mn 0.3wt%-1.1wt%、
Sb 0.5wt%-1.3wt%、
Se 0.4wt%-0.7wt%、
Si 0.5wt%-0.9wt%、
Surplus is Fe.
Further, described one is used for stainless mmaterial, comprises the composition of following weight:
Cr 14.5wt%-16.5wt%、
Ni 9.5wt%-10.6wt%、
C 1.7wt%-2.2wt%、
Mn 0.6wt%-0.9wt%、
Sb 0.6wt%-1.0wt%、
Se 0.5wt%-0.6wt%、
Si 0.6wt%-0.8wt%、
Surplus is Fe.
For a preparation method for stainless mmaterial, the described preparation method's step for stainless mmaterial is as follows:
(1) raw material mixing: to get Cr be by weight percentage 12.5wt%-18.5wt%, Ni be 8.6wt%-11.4wt%, C be 1.2wt%-2.5wt%, Mn be 0.3wt%-1.1wt%, Sb be 0.5wt%-1.3wt%, Se be 0.4wt%-0.7wt%, Si is 0.5wt%-0.9wt%, surplus is Fe, above-mentioned raw material is carried out high-speed mixing, high-speed mixer rotating speed is 400r/min-550r/min, and the high-speed mixing used time is 25min-45min;
(2) raw material ball milling: after high-speed mixing is even, mmaterial ball mill is carried out ball milling, ratio of grinding media to material is 35:1-45:1, and ball mill barrel rotating speed is 120-150r/min, and Ball-milling Time is 3-6h;
(3) shaping compacting: the mmaterial after ball milling is even carries out shaping compacting in the forming mould that cold extrusion is special, and be forced into 460MPa-560MPa, pressed density is 6.9-7.4g/m
3;
(4) vacuum sintering: vacuumize in sintering body of heater, modulation vacuum tightness is 10Pa-100Pa, by the powder metallurgy base substrate high temperature sintering of step (3), temperature rise rate is 15 DEG C/min, rising to sintering temperature is 820-900 DEG C, sintering time is 90min-180min, and slowly reducing sintering temperature to room temperature, is for stainless mmaterial after cooling.
Described a kind of preparation method for stainless mmaterial, described be 14.5wt%-16.5wt%, Ni be 9.5wt%-10.6wt%, C be 1.7wt%-2.2wt%, Mn be 0.6wt%-0.9wt%, Sb be 0.6wt%-1.0wt%, Se be 0.5wt%-0.6wt%, Si for Cr in the preparation method of stainless mmaterial is 0.6wt%-0.8wt%, surplus is Fe.
Described a kind of preparation method for stainless mmaterial, the described preparation method's high speed mixing machine rotating speed for stainless mmaterial is 450r/min, and the high-speed mixing used time is 40min.
Described a kind of preparation method for stainless mmaterial, described is 40:1 for ratio of grinding media to material in the preparation method of stainless mmaterial, and ball mill barrel rotating speed is 140r/min, and Ball-milling Time is 5h.
Described a kind of preparation method for stainless mmaterial, is forced into 530MPa during shaping compacting in the described preparation method for stainless mmaterial.
Described a kind of preparation method for stainless mmaterial, rising to sintering temperature in the described preparation method for stainless mmaterial is 870 DEG C, 150min.
Beneficial effect: the conventional hardness for stainless mmaterial is lower, HRC only has 40-60, the needs of some intensity aspects can not be met, stainless steel powder metallurgy material of the present invention obtains very large change in hardness, improve the hardness of stainless steel powder metallurgy material significantly, in the preparation technology of mmaterial of the present invention, the composition of composition is changed, also sintering process is improved in addition, therefore improve the hardness of the stainless steel powder metallurgy material prepared.
Embodiment
Embodiment 1
(1) raw material mixing: to get Cr be by weight percentage 15.5wt%, Ni be 10.2wt%, C be 1.9wt%, Mn be 0.7wt%, Sb be 0.8wt%, Se be 0.6wt%, Si is 0.7wt%, surplus is Fe, above-mentioned raw material is carried out high-speed mixing, high-speed mixer rotating speed is 450r/min, and the high-speed mixing used time is 40min;
(2) raw material ball milling: after high-speed mixing is even, mmaterial ball mill is carried out ball milling, ratio of grinding media to material is 40:1, and ball mill barrel rotating speed is 140r/min, and Ball-milling Time is 5h;
(3) shaping compacting: the mmaterial after ball milling is even carries out shaping compacting in the forming mould that cold extrusion is special, and be forced into 530MPa, pressed density is 7.2g/m
3;
(4) vacuum sintering: vacuumize in sintering body of heater, modulation vacuum tightness is 30Pa, by the powder metallurgy base substrate high temperature sintering of step (3), temperature rise rate is 15 DEG C/min, rising to sintering temperature is 870 DEG C, sintering time is 150min, and slowly reducing sintering temperature to room temperature, is for stainless mmaterial after cooling.
The hardness for stainless mmaterial that embodiment 1 prepares is 85.
Embodiment 2
(1) raw material mixing: to get Cr be by weight percentage 16.5wt%, Ni be 9.5wt%, C be 1.7wt%, Mn be 0.9wt%, Sb be 1.0wt%, Se be 0.5wt%, Si is 0.8wt%, surplus is Fe, above-mentioned raw material is carried out high-speed mixing, high-speed mixer rotating speed is 520r/min, and the high-speed mixing used time is 25min;
(2) raw material ball milling: after high-speed mixing is even, mmaterial ball mill is carried out ball milling, ratio of grinding media to material is 45:1, and ball mill barrel rotating speed is 120r/min, and Ball-milling Time is 3h;
(3) shaping compacting: the mmaterial after ball milling is even carries out shaping compacting in the forming mould that cold extrusion is special, and be forced into 560MPa, pressed density is 7.4g/m
3;
(4) vacuum sintering: vacuumize in sintering body of heater, modulation vacuum tightness is 10Pa, by the powder metallurgy base substrate high temperature sintering of step (3), temperature rise rate is 15 DEG C/min, rising to sintering temperature is 900 DEG C, sintering time is 180min, and slowly reducing sintering temperature to room temperature, is for stainless mmaterial after cooling.
The hardness for stainless mmaterial that embodiment 2 prepares is 76.
Embodiment 3
(1) raw material mixing: to get Cr be by weight percentage 14.5wt%, Ni be 10.6wt%, C be 2.2wt%, Mn be 0.6wt%, Sb be 0.6wt%, Se be 0.6wt%, Si is 0.6wt%, surplus is Fe, above-mentioned raw material is carried out high-speed mixing, high-speed mixer rotating speed is 440r/min, and the high-speed mixing used time is 45min;
(2) raw material ball milling: after high-speed mixing is even, mmaterial ball mill is carried out ball milling, ratio of grinding media to material is 35:1, and ball mill barrel rotating speed is 150r/min, and Ball-milling Time is 6h;
(3) shaping compacting: the mmaterial after ball milling is even carries out shaping compacting in the forming mould that cold extrusion is special, and be forced into 460MPa, pressed density is 6.9g/m
3;
(4) vacuum sintering: vacuumize in sintering body of heater, modulation vacuum tightness is 100Pa, by the powder metallurgy base substrate high temperature sintering of step (3), temperature rise rate is 15 DEG C/min, rising to sintering temperature is 820 DEG C, sintering time is 90min, and slowly reducing sintering temperature to room temperature, is for stainless mmaterial after cooling.
The hardness for stainless mmaterial that embodiment 3 prepares is 77.
Embodiment 4
(1) raw material mixing: to get Cr be by weight percentage 12.5wt%, Ni be 8.6wt%, C be 2.5wt%, Mn be 0.3wt%, Sb be 1.3wt%, Se be 0.4wt%, Si is 0.5wt%, surplus is Fe, above-mentioned raw material is carried out high-speed mixing, high-speed mixer rotating speed is 520r/min, and the high-speed mixing used time is 25min;
(2) raw material ball milling: after high-speed mixing is even, mmaterial ball mill is carried out ball milling, ratio of grinding media to material is 45:1, and ball mill barrel rotating speed is 120r/min, and Ball-milling Time is 3h;
(3) shaping compacting: the mmaterial after ball milling is even carries out shaping compacting in the forming mould that cold extrusion is special, and be forced into 560MPa, pressed density is 7.3g/m
3;
(4) vacuum sintering: vacuumize in sintering body of heater, modulation vacuum tightness is 10Pa, by the powder metallurgy base substrate high temperature sintering of step (3), temperature rise rate is 15 DEG C/min, rising to sintering temperature is 900 DEG C, sintering time is 180min, and slowly reducing sintering temperature to room temperature, is for stainless mmaterial after cooling.
The hardness for stainless mmaterial that embodiment 4 prepares is 69.
Embodiment 5
(1) raw material mixing: to get Cr be by weight percentage 18.5wt%, Ni be 11.4wt%, C be 1.2wt%, Mn be 1.1wt%, Sb be 0.5wt%, Se be 0.7wt%, Si is 0.9wt%, surplus is Fe, above-mentioned raw material is carried out high-speed mixing, high-speed mixer rotating speed is 440r/min, and the high-speed mixing used time is 45min;
(2) raw material ball milling: after high-speed mixing is even, mmaterial ball mill is carried out ball milling, ratio of grinding media to material is 35:1, and ball mill barrel rotating speed is 150r/min, and Ball-milling Time is 6h;
(3) shaping compacting: the mmaterial after ball milling is even carries out shaping compacting in the forming mould that cold extrusion is special, and be forced into 460MPa, pressed density is 7.0g/m
3;
(4) vacuum sintering: vacuumize in sintering body of heater, modulation vacuum tightness is 100Pa, by the powder metallurgy base substrate high temperature sintering of step (3), temperature rise rate is 15 DEG C/min, rising to sintering temperature is 820 DEG C, sintering time is 90min, and slowly reducing sintering temperature to room temperature, is for stainless mmaterial after cooling.
The hardness for stainless mmaterial that embodiment 5 prepares is 68.
Comparative example
License notification number is a kind of stainless steel powder metallurgy material disclosed in the patent of 101597712, comprises Cr12 Stainless Steel Powder 68.25%, 440C Stainless Steel Powder 30%, Graphite Powder 99 1.0%, lithium stearate 0.75%.After Homogeneous phase mixing, in compression moulding on oil press, vacuum oven, sintering temperature is 1280 DEG C, and insulation 90min, is cooled to 1050 DEG C, is cooled to room temperature after pouring nitrogen.Heat-treat in continuous heat treating furnace, temperature is 1060 DEG C again, pours nitrogen cooling after insulation 30min.
The hardness of stainless steel powder metallurgy material prepared by comparative example is 54.
Claims (8)
1. for a stainless mmaterial, it is characterized in that, the described composition comprising following weight for stainless mmaterial:
Cr 12.5wt%-18.5wt%、
Ni 8.6wt%-11.4wt%、
C 1.2wt%-2.5wt%、
Mn 0.3wt%-1.1wt%、
Sb 0.5wt%-1.3wt%、
Se 0.4wt%-0.7wt%、
Si 0.5wt%-0.9wt%、
Surplus is Fe.
2. one according to claim 1 is used for stainless mmaterial, it is characterized in that, the described composition comprising following weight for stainless mmaterial:
Cr 14.5wt%-16.5wt%、
Ni 9.5wt%-10.6wt%、
C 1.7wt%-2.2wt%、
Mn 0.6wt%-0.9wt%、
Sb 0.6wt%-1.0wt%、
Se 0.5wt%-0.6wt%、
Si 0.6wt%-0.8wt%、
Surplus is Fe.
3. for a preparation method for stainless mmaterial, it is characterized in that, the described preparation method's step for stainless mmaterial is as follows:
(1) raw material mixing: to get Cr be by weight percentage 12.5wt%-18.5wt%, Ni be 8.6wt%-11.4wt%, C be 1.2wt%-2.5wt%, Mn be 0.3wt%-1.1wt%, Sb be 0.5wt%-1.3wt%, Se be 0.4wt%-0.7wt%, Si is 0.5wt%-0.9wt%, surplus is Fe, above-mentioned raw material is carried out high-speed mixing, high-speed mixer rotating speed is 400r/min-550r/min, and the high-speed mixing used time is 25min-45min;
(2) raw material ball milling: after high-speed mixing is even, mmaterial ball mill is carried out ball milling, ratio of grinding media to material is 35:1-45:1, and ball mill barrel rotating speed is 120-150r/min, and Ball-milling Time is 3-6h;
(3) shaping compacting: the mmaterial after ball milling is even carries out shaping compacting in the forming mould that cold extrusion is special, and be forced into 460MPa-560MPa, pressed density is 6.9-7.4g/m
3;
(4) vacuum sintering: vacuumize in sintering body of heater, modulation vacuum tightness is 10Pa-100Pa, by the powder metallurgy base substrate high temperature sintering of step (3), temperature rise rate is 15 DEG C/min, rising to sintering temperature is 820-900 DEG C, sintering time is 90min-180min, and slowly reducing sintering temperature to room temperature, is for stainless mmaterial after cooling.
4. a kind of preparation method for stainless mmaterial according to claim 3, it is characterized in that, described be 14.5wt%-16.5wt%, Ni be 9.5wt%-10.6wt%, C be 1.7wt%-2.2wt%, Mn be 0.6wt%-0.9wt%, Sb be 0.6wt%-1.0wt%, Se be 0.5wt%-0.6wt%, Si for Cr in the preparation method of stainless mmaterial is 0.6wt%-0.8wt%, surplus is Fe.
5. a kind of preparation method for stainless mmaterial according to claim 3, is characterized in that, the described preparation method's high speed mixing machine rotating speed for stainless mmaterial is 450r/min, and the high-speed mixing used time is 40min.
6. a kind of preparation method for stainless mmaterial according to claim 3, it is characterized in that, described is 40:1 for ratio of grinding media to material in the preparation method of stainless mmaterial, and ball mill barrel rotating speed is 140r/min, and Ball-milling Time is 5h.
7. a kind of preparation method for stainless mmaterial according to claim 3, is characterized in that, is forced into 530MPa in the described preparation method for stainless mmaterial during shaping compacting.
8. a kind of preparation method for stainless mmaterial according to claim 3, is characterized in that, rising to sintering temperature in the described preparation method for stainless mmaterial is 870 DEG C, 150min.
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Cited By (7)
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| CN105483573A (en) * | 2015-12-03 | 2016-04-13 | 无锡拓能自动化科技有限公司 | Stainless steel material for dust-free chamber workbench and manufacturing method of stainless steel material |
| CN105568159A (en) * | 2015-12-22 | 2016-05-11 | 唐艺峰 | High-toughness stainless steel and preparation method thereof |
| CN108015275A (en) * | 2017-12-27 | 2018-05-11 | 洛阳神佳窑业有限公司 | Novel powder metallurgy material |
| CN108160986A (en) * | 2017-12-27 | 2018-06-15 | 洛阳神佳窑业有限公司 | A kind of powdered metallurgical material |
| CN108746234A (en) * | 2018-06-27 | 2018-11-06 | 唐竹胜 | A kind of production method of tubing string shape component of machine |
| CN111607745A (en) * | 2020-07-10 | 2020-09-01 | 海安县鹰球粉末冶金有限公司 | High-density and high-hardness vacuum sintering stainless steel material and processing technology thereof |
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| CN108015275A (en) * | 2017-12-27 | 2018-05-11 | 洛阳神佳窑业有限公司 | Novel powder metallurgy material |
| CN108160986A (en) * | 2017-12-27 | 2018-06-15 | 洛阳神佳窑业有限公司 | A kind of powdered metallurgical material |
| CN108746234A (en) * | 2018-06-27 | 2018-11-06 | 唐竹胜 | A kind of production method of tubing string shape component of machine |
| CN111607745A (en) * | 2020-07-10 | 2020-09-01 | 海安县鹰球粉末冶金有限公司 | High-density and high-hardness vacuum sintering stainless steel material and processing technology thereof |
| CN113500196A (en) * | 2021-07-14 | 2021-10-15 | 燕山大学 | Method for improving high-temperature oxidation resistance of austenitic stainless steel by regulating and controlling nano-network distribution of Si |
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