CN105154790A - High-strength wear-resistant nonmagnetic stainless steel and preparation method thereof - Google Patents
High-strength wear-resistant nonmagnetic stainless steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength wear-resistant nonmagnetic stainless steel and a preparation method thereof. The high-strength wear-resistant nonmagnetic stainless steel is composed of the following components in percentage by weight: 0.1%-0.18% of carbon, 8%-11% of nickel, 19%-21% of chromium, 1%-2% of manganese, 0.5%-1% of silicon, 0.48%-0.65% of niobium, 0.11%-0.14% of vanadium, 1.2%-2.0% of molybdenum, 0.021%-0.03% of titanium, 0.01%-0.1% of aluminum, 0.8%-2% of nitrogen, 0.2%-0.3% of rare earth, not more than 0.035% of phosphorus and sulfur, and the balance of iron thereof inevitable impurities. The high-strength wear-resistant nonmagnetic stainless steel has the advantages of favorable corrosion resistance, favorable intercrystalline corrosion resistance, favorable oxidation resistance, favorable acid/alkali resistance, high strength and high hardness.
Description
Technical field
The present invention relates to a kind of alloy material, particularly a kind of high-strength abrasion-proof magnetism-free stainless steel and preparation method thereof.
Background technology
At present, in domestic industry, widely used nonmagnetic steel is 18-8 type Austenitic stainless steel, and the smelting of nonmagnetic steel and processing technology are very ripe at home.But, along with the performance requriements of people to material is more and more higher, this material in use intensity and wear resistance more and more can not meet the requirement of people, particularly work under ocean environment, its erosion resistance and wear resistance are significantly not enough, not only affect visual appearance, affect the work-ing life of this material greatly simultaneously, cause corresponding cost to increase, security incident is easily sent out.
Summary of the invention
Goal of the invention of the present invention is: for above-mentioned Problems existing, a kind of high-strength abrasion-proof magnetism-free stainless steel and preparation method thereof is provided, makes stainless steel have good anti-corrosion and intergranular corrosion resistance performance, oxidation-resistance and resistance to acids and bases good, also there is high strength, high rigidity performance simultaneously.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of high-strength abrasion-proof magnetism-free stainless steel, components based on weight percentage calculation (following % all represents weight percent) of described high-strength abrasion-proof magnetism-free stainless steel is: carbon is 0.1% ~ 0.18%, nickel is 8% ~ 11%, chromium is 19% ~ 21%, manganese is 1% ~ 2%, silicon 0.5% ~ 1%, niobium is 0.48% ~ 0.65%, and vanadium is 0.11% ~ 0.14%, and molybdenum is 1.2% ~ 2.0%, titanium is 0.021% ~ 0.03%, aluminium is 0.01% ~ 0.1%, nitrogen 0.8% ~ 2%, and rare earth is 0.2% ~ 0.3%, the total amount of p and s is no more than 0.035%, and surplus is iron and inevitable impurity thereof.
Further, a kind of preparation method of high-strength abrasion-proof magnetism-free stainless steel, comprises the following steps:
Step 1, raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, bath temperature is made to control, at about 1550 DEG C, then in molten bath, to add decarburizer, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath;
After step 2, decarburization, desulfurization, deoxidation step complete, intensification bath temperature, make it to reach about 1600 DEG C, keep 5min, then in molten bath, add high carbon ferro-chrome continuously, ferromanganese and nickel shot, make the chromium content in molten bath, Fe content, nickel content reach pre-provisioning request, regulates temperature, make temperature control at about 1600 DEG C, keep 5min;
Step 3, after step 2 terminates, then add raw material molybdenum-iron, vanadium iron, ferrotianium and ferro-niobium in molten bath, and continue to add decarburizer and carry out decarburization, after iron has melted, raise bath temperature, made temperature control at 1700 DEG C, keep 5min, add dehydrogenating agent, denitrfying agent, decarburizer, sweetening agent, reductor, now alloy composition is finely tuned, make it to reach predetermined component requirements, continue decarburization, control the content of carbon;
Step 4, when carbon content reaches 0.1% ~ 0.18%, in molten bath, add the chromium metal in ferrosilicon and aluminium reducing molten bath, and control the content of Silicified breccias, make it to reach predetermined component requirements, vacuum heat-preserving 9min, smelt and terminate, add the rare earth of specified amount in the most backward ladle, terminate.
Further, also need to heat-treat after the melting of described high-strength abrasion-proof magnetism-free stainless steel, its thermal treatment process is:
Step 1, melted high-strength abrasion-proof magnetism-free stainless steel is carried out solution treatment, put into heat treatment furnace by high-strength abrasion-proof magnetism-free stainless steel and be heated to 1000 DEG C ~ 1050 DEG C, temperature rise rate is 100 DEG C/h, insulation 5 ~ 6h, and then shrend is to room temperature;
After step 2, the solution treatment of high-strength abrasion-proof magnetism-free stainless steel terminate, carry out stabilization treatment, be heated to 850 DEG C ~ 870 DEG C by the high-strength abrasion-proof magnetism-free stainless steel after solution treatment, temperature rise rate is 90 DEG C/h, insulation 4 ~ 5h, then sky is cooled to room temperature, terminates.
Further, described high-strength abrasion-proof magnetism-free stainless steel also needs to carry out destressing process after cold working or welding, is heated to 600 DEG C ~ 650 DEG C tempering by the high-strength abrasion-proof magnetism-free stainless steel after cold working or welding, temperature rise rate is 80 DEG C/h, insulation 1 ~ 2h, then furnace cooling is to room temperature, terminates.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, anti-corrosion and intergranular corrosion resistance performance is good, oxidation-resistance, resistance to acids and bases is excellent.
In alloying element, chromium determines the corrosion proof principal element of stainless steel, chromium forms sosoloid in iron, the electropotential of sosoloid is the change of sudden change formula with the increase of chromium content, then in great-jump-forward, ground significantly weakens in corrosion, therefore stainless steel chrome content of the present invention is more than 19%, reach 21%, therefore anticorrosion effect is remarkable, simultaneously chromium can be formed on the surface of steel and oxygen one deck densification, stable, complete and can with the chromium oxide passivation film of collective's mortise of iron, effectively can prevent the corrosion of steel, the oxidation-resistance of steel is significantly strengthened; By adding vanadium, titanium, niobium element in stainless steel, in steel, forming stable carbide, effectively can avoid on crystal boundary, be settled out chromium carbide and causing stainless intergranular corrosion; In order to improve stainless acid-proof alkaline, in steel, added nickel and the molybdenum of a great deal of, nickel can significantly improve the electropotential of stainless steel base, and erosion resistance significantly strengthens, resistance to acids and bases improves, but nickel resources is more rare, expensive, should not too much add, nickel content is in 8 ~ 11% best results, molybdenum can form stable passive film in steel, improves the performance of steel acid and alkali-resistance, can also improve the ability of steel anti intercrystalline corrosion simultaneously.
2, plasticity good toughness, hardness strength is high.
This stainless carbon content is 0.1 ~ 0.18%, belong to soft steel, therefore plasticity and toughness are very well, simultaneously in order to solve the low shortcoming of soft steel hardness strength, the chromium that Xiang Gangzhong adds, manganese, nickel and element silicon, these elements significantly can strengthen hardness and the intensity of steel, improve the quenching property of steel, improve the hot workability of steel, make steel have higher intensity and hardness, can complicated Working environment be adapted to, particularly be suitable in ocean environment.
3, excellent in abrasion resistance, toughness strengthens.
Manganese in steel, chromium and silicon form carbide or the oxide compound with wear resistance, significantly improve the wear resistance of steel, steel is in use not easily worn, and improve work-ing life; By adding vanadium, titanium and a small amount of aluminium in steel, can crystal grain thinning, strengthen intensity, increase impelling strength, improve wear resistance.
4, nonmagnetic, weldability and good processability.
This stainless steel is single phase austenite stainless steel, has nonmagnetic, and plasticity good toughness, is easy to machining; Owing to being added with the element preventing intergranular corrosion, overcome austenitic stainless steel in welding process, intergranular corrosion is serious, causes crystal grain to come off, the shortcoming of steel part brittle failure, and welding property is good, strong adaptability.
Embodiment
Following non-limiting examples is for illustration of the present invention.
embodiment one:
1, the preparation method of high-strength abrasion-proof magnetism-free stainless steel: raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, bath temperature is made to control at about 1550 DEG C, then in molten bath, decarburizer is added, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath, then heat up bath temperature, make it to reach about 1600 DEG C, keep 5min, then in molten bath, add high carbon ferro-chrome continuously, ferromanganese and nickel shot, make the chromium content in molten bath, Fe content, nickel content reaches pre-provisioning request, and continue to add decarburizer and carry out decarburization, after iron has melted, regulate temperature, temperature is made to control at about 1600 DEG C, keep 5min, raw material molybdenum-iron is added again in molten bath, vanadium iron, ferrotianium and ferro-niobium, raise bath temperature, temperature is made to control at 1700 DEG C, keep 5min, add dehydrogenating agent, denitrfying agent, now alloy composition is finely tuned, the mass percent of alloying constituent is made to reach requirement, continue decarburization, control the content of carbon, when carbon content reaches 0.1%, the chromium metal in ferrosilicon and aluminium reducing molten bath is added in molten bath, and control the content of Silicified breccias, make it to reach predetermined component requirements, vacuum heat-preserving 9min, smelt and terminate, the rare earth of specified amount is added in the most backward ladle, the mass percent of above-mentioned Chemical Composition controls as follows: carbon is 0.1%, nickel is 11%, chromium is 19%, manganese is 2%, silicon 0.5%, niobium is 0.65%, vanadium is 0.14%, molybdenum is 1.7%, titanium is 0.025%, aluminium is 0.01%, nitrogen 1.2%, rare earth is 0.2%, the total amount of p and s is no more than 0.035%, surplus is iron and inevitable impurity thereof.
2, after melting terminates, to heat-treat high-strength abrasion-proof magnetism-free stainless steel, thermal treatment process is as follows: step 1, melted high-strength abrasion-proof magnetism-free stainless steel is carried out solution treatment, put into heat treatment furnace by high-strength abrasion-proof magnetism-free stainless steel and be heated to 1000 DEG C, temperature rise rate is 100 DEG C/h, insulation 6h, then shrend is to room temperature; After step 2, the solution treatment of high-strength abrasion-proof magnetism-free stainless steel terminate, carry out stabilization treatment, be heated to 870 DEG C by the high-strength abrasion-proof magnetism-free stainless steel after solution treatment, temperature rise rate is 90 DEG C/h, and insulation 4h, then sky is cooled to room temperature, and thermal treatment terminates.
High-strength abrasion-proof magnetism-free stainless steel also needs to carry out destressing process after cold working or welding, and be heated to 600 DEG C of tempering by the high-strength abrasion-proof magnetism-free stainless steel after cold working or welding, temperature rise rate is 80 DEG C/h, and insulation 2h, then furnace cooling is to room temperature.
Anti-corrosion magnetism-free stainless steel after above-mentioned steps machines is compared with 12Cr18Ni9 steel, mechanical property is improved significantly, due to containing multiple alloying element, influence each other between each element, significantly can improve the over-all properties of high-strength abrasion-proof magnetism-free stainless steel, meanwhile, its high-wearing feature had and toughness can adapt in the such complex environment in ocean completely, and its safety and stability is reliable.
embodiment two:
1, the preparation method of high-strength abrasion-proof magnetism-free stainless steel: raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, bath temperature is made to control at about 1550 DEG C, then in molten bath, decarburizer is added, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath, then heat up bath temperature, make it to reach about 1600 DEG C, keep 5min, then in molten bath, add high carbon ferro-chrome continuously, ferromanganese and nickel shot, make the chromium content in molten bath, Fe content, nickel content reaches pre-provisioning request, and continue to add decarburizer and carry out decarburization, after iron has melted, regulate temperature, temperature is made to control at about 1600 DEG C, keep 5min, raw material molybdenum-iron is added again in molten bath, vanadium iron, ferrotianium and ferro-niobium, raise bath temperature, temperature is made to control at 1700 DEG C, keep 5min, add dehydrogenating agent, denitrfying agent, now alloy composition is finely tuned, the mass percent of alloying constituent is made to reach requirement, continue decarburization, control the content of carbon, when carbon content reaches 0.18%, the chromium metal in ferrosilicon and aluminium reducing molten bath is added in molten bath, and control the content of Silicified breccias, make it to reach predetermined component requirements, vacuum heat-preserving 9min, smelt and terminate, the rare earth of specified amount is added in the most backward ladle, the mass percent of above-mentioned Chemical Composition controls as follows: carbon is 0.18%, nickel is 8%, chromium is 21%, manganese is 1%, silicon 1%, niobium is 0.48%, vanadium is 0.11%, molybdenum is 2.0%, titanium is 0.03%, aluminium is 0.06%, nitrogen 0.8%, rare earth is 0.3%, the total amount of p and s is no more than 0.035%, surplus is iron and inevitable impurity thereof.
2, after melting terminates, to heat-treat high-strength abrasion-proof magnetism-free stainless steel, thermal treatment process is as follows: step 1, melted wear-resisting magnetism-free stainless steel is carried out solution treatment, put into heat treatment furnace by high-strength abrasion-proof magnetism-free stainless steel and be heated to 1050 DEG C, temperature rise rate is 100 DEG C/h, insulation 5h, then shrend is to room temperature; After step 2, the solution treatment of high-strength abrasion-proof magnetism-free stainless steel terminate, carry out stabilization treatment, be heated to 850 DEG C by the high-strength abrasion-proof magnetism-free stainless steel after solution treatment, temperature rise rate is 90 DEG C/h, and insulation 5h, then sky is cooled to room temperature, and thermal treatment terminates.
High-strength abrasion-proof magnetism-free stainless steel also needs to carry out destressing process after cold working or welding, and be heated to 650 DEG C of tempering by the high-strength abrasion-proof magnetism-free stainless steel after cold working or welding, temperature rise rate is 80 DEG C/h, and insulation 1h, then furnace cooling is to room temperature.
Anti-corrosion magnetism-free stainless steel after above-mentioned steps machines is compared with 12Cr18Ni9 steel, mechanical property is improved significantly, due to containing multiple alloying element, influence each other between each element, significantly can improve the over-all properties of high-strength abrasion-proof magnetism-free stainless steel, meanwhile, its high-wearing feature had and toughness can adapt in the such complex environment in ocean completely, and its safety and stability is reliable.
embodiment three:
1, the preparation method of high-strength abrasion-proof magnetism-free stainless steel: raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, bath temperature is made to control at about 1550 DEG C, then in molten bath, decarburizer is added, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath, then heat up bath temperature, make it to reach about 1600 DEG C, keep 5min, then in molten bath, add high carbon ferro-chrome continuously, ferromanganese and nickel shot, make the chromium content in molten bath, Fe content, nickel content reaches pre-provisioning request, and continue to add decarburizer and carry out decarburization, after iron has melted, regulate temperature, temperature is made to control at about 1600 DEG C, keep 5min, raw material molybdenum-iron is added again in molten bath, vanadium iron, ferrotianium and ferro-niobium, raise bath temperature, temperature is made to control at 1700 DEG C, keep 5min, add dehydrogenating agent, denitrfying agent, now alloy composition is finely tuned, the mass percent of alloying constituent is made to reach requirement, continue decarburization, control the content of carbon, when carbon content reaches 0.15%, the chromium metal in ferrosilicon and aluminium reducing molten bath is added in molten bath, and control the content of Silicified breccias, make it to reach predetermined component requirements, vacuum heat-preserving 9min, smelt and terminate, the rare earth of specified amount is added in the most backward ladle, the mass percent of above-mentioned Chemical Composition controls as follows: carbon is 0.15%, nickel is 10%, chromium is 20%, manganese is 1.5%, silicon 0.8%, niobium is 0.55%, vanadium is 0.12%, molybdenum is 1.2%, titanium is 0.028%, aluminium is 0.1%, nitrogen 2%, rare earth is 0.26%, the total amount of p and s is no more than 0.035%, surplus is iron and inevitable impurity thereof.
2, after melting terminates, to heat-treat high-strength abrasion-proof magnetism-free stainless steel, thermal treatment process is as follows: step 1, melted high-strength abrasion-proof magnetism-free stainless steel is carried out solution treatment, put into heat treatment furnace by high-strength abrasion-proof magnetism-free stainless steel and be heated to 1030 DEG C, temperature rise rate is 100 DEG C/h, insulation 5.5h, then shrend is to room temperature; After step 2, the solution treatment of high-strength abrasion-proof magnetism-free stainless steel terminate, carry out stabilization treatment, be heated to 830 DEG C by the high-strength abrasion-proof magnetism-free stainless steel after solution treatment, temperature rise rate is 90 DEG C/h, insulation 4.5h, then sky is cooled to room temperature, and thermal treatment terminates.
High-strength abrasion-proof magnetism-free stainless steel also needs to carry out destressing process after cold working or welding, and be heated to 630 DEG C of tempering by the high-strength abrasion-proof magnetism-free stainless steel after cold working or welding, temperature rise rate is 80 DEG C/h, and insulation 1.5h, then furnace cooling is to room temperature.
Anti-corrosion magnetism-free stainless steel after above-mentioned steps machines is compared with 12Cr18Ni9 steel, mechanical property is improved significantly, due to containing multiple alloying element, influence each other between each element, significantly can improve the over-all properties of high-strength abrasion-proof magnetism-free stainless steel, meanwhile, its high-wearing feature had and toughness can adapt in the such complex environment in ocean completely, and its safety and stability is reliable.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a high-strength abrasion-proof magnetism-free stainless steel, it is characterized in that, components based on weight percentage calculation (following % all represents weight percent) of described high-strength abrasion-proof magnetism-free stainless steel is: carbon is 0.1% ~ 0.18%, nickel is 8% ~ 11%, chromium is 19% ~ 21%, manganese is 1% ~ 2%, silicon 0.5% ~ 1%, and niobium is 0.48% ~ 0.65%, vanadium is 0.11% ~ 0.14% Molybdenum is 1.2% ~ 2.0%, and titanium is 0.021% ~ 0.03%, and aluminium is 0.01% ~ 0.1%, nitrogen 0.8% ~ 2%, rare earth is 0.2% ~ 0.3%, and the total amount of p and s is no more than 0.035%, and surplus is iron and inevitable impurity thereof.
2. the preparation method of high-strength abrasion-proof magnetism-free stainless steel as claimed in claim 1, is characterized in that, comprise the following steps:
Step 2-1, raw material iron is put into converter heat fused, after raw material iron all melts, regulate bath temperature, bath temperature is made to control, at about 1550 DEG C, then in molten bath, to add decarburizer, sweetening agent, reductor, carries out decarburization, desulfurization, deoxidation to the molten iron in molten bath;
After step 2-2, decarburization, desulfurization, deoxidation step complete, intensification bath temperature, make it to reach about 1600 DEG C, keep 5min, then in molten bath, add high carbon ferro-chrome continuously, ferromanganese and nickel shot, make the chromium content in molten bath, Fe content, nickel content reach pre-provisioning request, regulates temperature, make temperature control at about 1600 DEG C, keep 5min;
Step 2-3, after step 3 terminates, then add raw material molybdenum-iron, vanadium iron, ferrotianium and ferro-niobium in molten bath, and continue to add decarburizer and carry out decarburization, after iron has melted, raise bath temperature, made temperature control at 1700 DEG C, keep 5min, add dehydrogenating agent, denitrfying agent, decarburizer, sweetening agent, reductor, now alloy composition is finely tuned, make it to reach predetermined component requirements, continue decarburization, control the content of carbon;
Step 2-4, when carbon content reaches 0.1% ~ 0.18%, in molten bath, add the chromium metal in ferrosilicon and aluminium reducing molten bath, and control the content of Silicified breccias, make it to reach predetermined component requirements, vacuum heat-preserving 9min, smelt and terminate, add the rare earth of specified amount in the most backward ladle, terminate.
3. high-strength abrasion-proof magnetism-free stainless steel as claimed in claim 2, it is characterized in that, also need to heat-treat after the melting of described high-strength abrasion-proof magnetism-free stainless steel, its thermal treatment process is:
Step 3-1, melted high-strength abrasion-proof magnetism-free stainless steel is carried out solution treatment, put into heat treatment furnace by high-strength abrasion-proof magnetism-free stainless steel and be heated to 1000 DEG C ~ 1050 DEG C, temperature rise rate is 100 DEG C/h, insulation 5 ~ 6h, and then shrend is to room temperature;
After step 3-2, the solution treatment of high-strength abrasion-proof magnetism-free stainless steel terminate, carry out stabilization treatment, be heated to 850 DEG C ~ 870 DEG C by the high-strength abrasion-proof magnetism-free stainless steel after solution treatment, temperature rise rate is 90 DEG C/h, insulation 4 ~ 5h, then sky is cooled to room temperature, terminates.
4. high-strength abrasion-proof magnetism-free stainless steel as claimed in claim 2, it is characterized in that, described high-strength abrasion-proof magnetism-free stainless steel also needs to carry out destressing process after cold working or welding, 600 DEG C ~ 650 DEG C tempering are heated to by the high-strength abrasion-proof magnetism-free stainless steel after cold working or welding, temperature rise rate is 80 DEG C/h, insulation 1 ~ 2h, then furnace cooling is to room temperature, terminates.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107317404A (en) * | 2017-06-21 | 2017-11-03 | 徐州明润磁材有限公司 | It is a kind of for magnetic patch of motor and preparation method thereof |
| CN112111637A (en) * | 2020-09-27 | 2020-12-22 | 江油市长祥特殊钢制造有限公司 | Heat treatment method of stainless steel |
| CN112144006A (en) * | 2020-09-12 | 2020-12-29 | 高安市恒瑞源实业有限公司 | High-strength wear-resistant non-magnetic hard alloy and preparation method thereof |
| CN113025888A (en) * | 2021-02-07 | 2021-06-25 | 首钢集团有限公司 | Abrasion-resistant high-strength steel and preparation method thereof |
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| JP2000239804A (en) * | 1999-02-18 | 2000-09-05 | Sumitomo Electric Ind Ltd | Stainless steel wire for heat resistant spring, heat resistant spring, and manufacture of heat resistant spring |
| CN101151394A (en) * | 2005-04-04 | 2008-03-26 | 住友金属工业株式会社 | Austenitic stainless steel |
| CN104379773A (en) * | 2012-01-20 | 2015-02-25 | Jl材料工艺有限公司 | An austenitic stainless steel product and a method for manufacturing same |
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| JP2000239804A (en) * | 1999-02-18 | 2000-09-05 | Sumitomo Electric Ind Ltd | Stainless steel wire for heat resistant spring, heat resistant spring, and manufacture of heat resistant spring |
| CN101151394A (en) * | 2005-04-04 | 2008-03-26 | 住友金属工业株式会社 | Austenitic stainless steel |
| CN104379773A (en) * | 2012-01-20 | 2015-02-25 | Jl材料工艺有限公司 | An austenitic stainless steel product and a method for manufacturing same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107317404A (en) * | 2017-06-21 | 2017-11-03 | 徐州明润磁材有限公司 | It is a kind of for magnetic patch of motor and preparation method thereof |
| CN112144006A (en) * | 2020-09-12 | 2020-12-29 | 高安市恒瑞源实业有限公司 | High-strength wear-resistant non-magnetic hard alloy and preparation method thereof |
| CN112111637A (en) * | 2020-09-27 | 2020-12-22 | 江油市长祥特殊钢制造有限公司 | Heat treatment method of stainless steel |
| CN113025888A (en) * | 2021-02-07 | 2021-06-25 | 首钢集团有限公司 | Abrasion-resistant high-strength steel and preparation method thereof |
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