CN111020401A - Stainless steel for power transmission and transformation engineering and production method thereof - Google Patents
Stainless steel for power transmission and transformation engineering and production method thereof Download PDFInfo
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
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Abstract
The invention provides stainless steel for power transmission and transformation engineering and a production method thereof, wherein the stainless steel comprises the following components in parts by mass: c: 0.05-0.16, Si is less than or equal to 1.00, Mn is less than or equal to 1.00, S is less than or equal to 0.014, P is less than or equal to 0.080, and Cr: 12-15, Ni: 1.3-2.2, Cu is less than or equal to 0.05, Mo is less than or equal to 0.015, N is less than or equal to 0.010, and the balance of Fe and inevitable impurities. The stainless steel provided by the invention overcomes the limitation of the existing power transmission and transformation engineering such as iron tower raw materials in the aspect of selecting steel, realizes specialization and continuity of the application of the high-strength stainless steel in the power transmission and transformation engineering, improves the efficiency, reduces the energy consumption and protects the environment.
Description
Technical Field
The invention relates to a stainless steel material, in particular to a stainless steel for power transmission and transformation engineering and a production method thereof.
Background
The traditional power transmission and transformation iron towers in China are basically formed by connecting plain carbon angle steels or steel pipes through bolts, and are generally applied due to the convenience in processing and field assembly. Iron and steel are easily corroded when exposed in humid air, and iron tower factories commonly adopt a hot-dip galvanizing process to carry out anticorrosion treatment on angle steel and the like all the time, while galvanized steel can protect an internal steel structure by depending on metal zinc which forms a compact oxide protective layer in the air. Therefore, the steel material after hot dip galvanizing has a long service life, but has a bad influence of high cost and environmental pollution. In the service process of the iron tower, the maintenance cost is very high due to atmospheric corrosion.
Therefore, a stainless steel for power transmission and transformation engineering and a production method thereof are needed to meet the defects of the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the applicant designs a stainless steel for power transmission and transformation engineering and a production method thereof; the limitation of the raw materials of iron towers in the prior power transmission and transformation engineering such as steel selection is overcome, the application specialization and the continuity of the high-strength stainless steel in the power transmission and transformation engineering are realized, the efficiency is improved, the energy consumption is reduced, and the environment is protected.
The purpose of the invention is realized by the following technical scheme:
the invention provides stainless steel for power transmission and transformation engineering, which comprises the following components in parts by mass:
c: 0.05-0.16, Si is less than or equal to 1.00, Mn is less than or equal to 1.00, S is less than or equal to 0.014, P is less than or equal to 0.080, and Cr: 12-15, Ni: 1.3-2.2, Cu is less than or equal to 0.05, Mo is less than or equal to 0.015, N is less than or equal to 0.010, and the balance of Fe and inevitable impurities.
Preferably, the stainless steel comprises the following components in percentage by mass:
c: 0.07 to 0.15, Si: 0.20 to 1.00, Mn: 0.30-1.00, S: 0.004-0.014, P: 0.050-0.080, Cr: 12-14, Ni: 1.3-2.0, Cu is less than or equal to 0.025, Mo is less than or equal to 0.01, N is less than or equal to 0.010, and the balance of Fe and inevitable impurities.
Preferably, the stainless steel comprises the following components in percentage by mass:
c: 0.09-0.15, Si: 0.42 to 0.81, Mn: 0.49-0.54, S: 0.005-0.014, P: 0.059 to 0.060, Cr: 12.47 to 12.85, Ni: 1.38 to 1.69, Cu: 0.01-0.025 wt%, Mo less than or equal to 0.01 wt%, N less than or equal to 0.010 wt%, and Fe and inevitable impurities for the rest.
Preferably, the stainless steel comprises the following components in percentage by mass:
c: 0.16, Si: 0.42, Mn: 0.49, S: 0.014, P: 0.059, Cr: 12.47, Ni: 1.38, Cu: 0.05, Mo: 0.01, and the balance of Fe and inevitable impurities.
Preferably, the stainless steel comprises the following components in percentage by mass:
c: 0.09, Si: 0.81, Mn: 0.54, S: 0.005, P: 0.0:60, Cr: 12.85, Ni: 1.69, Cu: 0.01, and the balance of Fe and inevitable impurities.
Based on the same invention idea, the invention also provides a production method of the stainless steel for power transmission and transformation engineering, which comprises the following steps:
(1) performing AOD refining, LF refining and continuous casting on blast furnace molten iron in sequence, and performing slow cooling on a billet obtained by continuous casting to obtain a rolling blank;
(2) the rolling blank heated to the temperature required by rolling is sent to a rolling mill for rolling, and the rolled formed steel is slowly cooled;
(3) quenching and tempering the formed steel according to the application requirement;
(4) and (4) sequentially carrying out whitening treatment, finishing treatment and finished product inspection on the formed steel after the quenching and tempering treatment.
Preferably, the blast furnace molten iron is prepared by the following method:
and crushing and screening the nickel-chromium ore, then carrying out batching and sintering and carrying out blast furnace smelting to obtain blast furnace molten iron.
Preferably, the batching process requires the addition of manganese ore to the nichrome ore to reduce the viscosity of the slag.
Preferably, the first and second liquid crystal materials are,
in the burdening process, a binder and a catalyst are added into the nickel-chromium ore to improve the cold and hot strength of the cold-pressed pellets and the carbon-containing pellets.
Preferably, the blast furnace molten iron obtained by blast furnace smelting directly enters AOD refining.
Preferably, the formed steel comprises a bar material, an angle steel and a steel plate.
Preferably, the quenching and tempering the formed steel material according to the application requirement includes:
taking the formed steel materials with the number more than or equal to 1 as samples respectively;
modulating the sample according to different quenching and tempering schemes;
comparing the mechanical property of the sample after the quenching and tempering with the application requirement to obtain an optimal quenching and tempering scheme;
and carrying out thermal refining on the rest formed steel according to the optimal thermal refining scheme.
Preferably, the quenching temperatures of the different thermal refining schemes are respectively higher than 700 ℃.
Preferably, the whitening treatment comprises descaling, pickling and passivation;
the descaling includes: firstly, polishing and grinding to remove oxide skin, and then polishing by using abrasive cloth to improve the smoothness;
the pickling comprises the following steps: removing oil and cleaning dirt, and then carrying out acid washing for 5-8 min at the temperature of not higher than 75 ℃ by adopting acid washing liquid;
the passivation comprises: firstly soaking the raw materials in a passivation solution, heating to 80 +/-5 ℃, boiling for 15-30 min, cleaning, soaking for more than 15min at 60 +/-5 ℃ in a stainless iron complexing agent, cleaning, soaking and rinsing for 3min in clear water with the chloride ion content of less than 25PPM, and finally drying.
Preferably, the pickling solution comprises the following components in percentage by mass:
sulfuric acid: 22-25% and nitric acid: 8-10%, hydrofluoric acid: 1.5 percent and the balance of water.
Preferably, the passivation solution comprises an ID4000 passivation solution.
Preferably, the first and second liquid crystal materials are,
the finished product inspection comprises appearance inspection, size precision inspection and mechanical property inspection, and the finished product is the finished product with the inspection result meeting the application requirement.
Compared with the closest prior art, the invention has the beneficial effects that:
1. the technical scheme provided by the invention overcomes the limitation of the existing power transmission and transformation engineering such as iron tower raw materials in the aspect of selecting steel, realizes specialization and continuity of the application of the high-strength stainless steel in the power transmission and transformation engineering, improves the efficiency, reduces the energy consumption and protects the environment.
2. According to the technical scheme provided by the invention, the product produced by the method can be directly used as high-quality steel, and can also be used as high-quality blank for downstream processing to further produce stainless steel structural members.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below.
Example 1
The invention provides stainless steel for power transmission and transformation engineering, which comprises the following components in parts by mass:
c: 0.05, Si: 1.00, Mn: 1.00, S: 0.014, P: 0.080, Cr: 12. ni: 1.3, Cu: 0.05, Mo: 0.015, N: 0.010, and the balance of Fe and inevitable impurities.
Example 2
Based on the same invention thought, the invention provides stainless steel for power transmission and transformation engineering, which comprises the following components in percentage by mass:
c: 0.07, Si: 0.20, Mn: 0.30, S: 0.004, P: 0.050, Cr: 14. ni: 2.0, Cu: 0.025, Mo: 0.01, N: 0.010, and the balance of Fe and inevitable impurities.
Example 3
Based on the same invention thought, the invention provides stainless steel for power transmission and transformation engineering, which comprises the following components in percentage by mass:
c: 0.16, Si: 0.42, Mn: 0.49, S: 0.014, P: 0.059, Cr: 12.47, Ni: 1.38, Cu: 0.05, Mo: 0.01, and the balance of Fe and inevitable impurities.
Example 4
Based on the same invention thought, the invention provides stainless steel for power transmission and transformation engineering, which comprises the following components in percentage by mass:
c: 0.09, Si: 0.81, Mn: 0.54, S: 0.005, P: 0.0:60, Cr: 12.85, Ni: 1.69, Cu: 0.01, and the balance of Fe and inevitable impurities.
Example 5
Based on the same invention idea, the invention also provides a production method of the stainless steel for power transmission and transformation engineering, which comprises the following steps:
(1) performing AOD refining, LF refining and continuous casting on blast furnace molten iron in sequence, and performing slow cooling on a billet obtained by continuous casting to obtain a rolling blank;
(2) the rolling blank heated to the temperature required by rolling is sent to a rolling mill for rolling, and the rolled formed steel is slowly cooled;
(3) quenching and tempering the formed steel according to the application requirement;
(4) and (4) sequentially carrying out whitening treatment, finishing treatment and finished product inspection on the formed steel after the quenching and tempering treatment.
The blast furnace molten iron is prepared by the following method:
and crushing and screening the nickel-chromium ore, then carrying out batching and sintering and carrying out blast furnace smelting to obtain blast furnace molten iron.
In the burdening process, manganese ore is added into the nickel-chromium ore to reduce the viscosity of the slag.
In the burdening process, a binder and a catalyst are added into the nickel-chromium ore to improve the cold and hot strength of the cold-pressed pellets and the carbon-containing pellets.
And directly carrying out AOD refining on the blast furnace molten iron obtained by blast furnace smelting.
The formed steel comprises bars, angle steel and steel plates.
The quenching and tempering treatment of the formed steel according to the application requirement comprises the following steps:
taking the formed steel materials with the number more than or equal to 1 as samples respectively;
modulating the sample according to different quenching and tempering schemes;
comparing the mechanical property of the sample after the quenching and tempering with the application requirement to obtain an optimal quenching and tempering scheme;
and carrying out thermal refining on the rest formed steel according to the optimal thermal refining scheme.
The quenching temperatures of the different quenching and tempering schemes are respectively higher than 700 ℃.
In this example, two samples are taken from the bar and the steel plate respectively and subjected to scheme 1 modulation treatment and scheme 2 thermal refining treatment:
scheme 1 thermal refining: air cooling the quenched oil at 980 ℃ for 1h and at 200 ℃ for 3 h;
scheme 2 thermal refining: air cooling at 700 ℃ for 2 h;
the mechanical property detection results of the quenched and tempered samples are shown in table 1:
table 1: sample mechanical property monitoring result table after quenching and tempering treatment in scheme 1 and scheme 2
It can be seen from the above table that the mechanical properties of the result after the thermal refining in the scheme 1 are all better than those in the scheme 2, and the application requirements are better met, so that the rest formed steel is subjected to thermal refining in the scheme 1.
The whitening treatment comprises scale removal, acid pickling and passivation;
the descaling includes: firstly, polishing and grinding to remove oxide skin, and then polishing by using abrasive cloth to improve the smoothness;
the pickling comprises the following steps: removing oil and cleaning dirt, and then carrying out acid washing for 5-8 min at the temperature of not higher than 75 ℃ by adopting acid washing liquid;
the passivation comprises: firstly soaking the raw materials in a passivation solution, heating to 80 +/-5 ℃, boiling for 15-30 min, cleaning, soaking for more than 15min at 60 +/-5 ℃ in a stainless iron complexing agent, cleaning, soaking and rinsing for 3min in clear water with the chloride ion content of less than 25PPM, and finally drying.
The pickling solution comprises the following components in percentage by mass:
sulfuric acid: 22-25% and nitric acid: 8-10%, hydrofluoric acid: 1.5 percent and the balance of water.
The passivation solution comprises an ID4000 passivation solution.
The finished product inspection comprises appearance inspection, size precision inspection and mechanical property inspection, and the finished product is the finished product with the inspection result meeting the application requirement.
Finally, it should be noted that: the embodiments described are only a part of the embodiments of the present application, and not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments in the present application belong to the protection scope of the present application.
Claims (17)
1. The stainless steel for the power transmission and transformation project is characterized by comprising the following components in parts by mass:
c: 0.05-0.16, Si is less than or equal to 1.00, Mn is less than or equal to 1.00, S is less than or equal to 0.014, P is less than or equal to 0.080, and Cr: 12-15, Ni: 1.3-2.2, Cu is less than or equal to 0.05, Mo is less than or equal to 0.015, N is less than or equal to 0.010, and the balance of Fe and inevitable impurities.
2. The stainless steel for power transmission and transformation engineering according to claim 1, wherein the stainless steel comprises the following components in parts by mass:
c: 0.07 to 0.15, Si: 0.20 to 1.00, Mn: 0.30-1.00, S: 0.004-0.014, P: 0.050-0.080, Cr: 12-14, Ni: 1.3-2.0, Cu is less than or equal to 0.025, Mo is less than or equal to 0.01, N is less than or equal to 0.010, and the balance of Fe and inevitable impurities.
3. The stainless steel for power transmission and transformation engineering according to claim 1, wherein the stainless steel comprises the following components in parts by mass:
c: 0.09-0.15, Si: 0.42 to 0.81, Mn: 0.49-0.54, S: 0.005-0.014, P: 0.059 to 0.060, Cr: 12.47 to 12.85, Ni: 1.38 to 1.69, Cu: 0.01-0.025 wt%, Mo less than or equal to 0.01 wt%, N less than or equal to 0.010 wt%, and Fe and inevitable impurities for the rest.
4. The stainless steel for power transmission and transformation engineering according to claim 1, wherein the stainless steel comprises the following components in parts by mass:
c: 0.16, Si: 0.42, Mn: 0.49, S: 0.014, P: 0.059, Cr: 12.47, Ni: 1.38, Cu: 0.05, Mo: 0.01, and the balance of Fe and inevitable impurities.
5. The stainless steel for power transmission and transformation engineering according to claim 1, wherein the stainless steel comprises the following components in parts by mass:
c: 0.09, Si: 0.81, Mn: 0.54, S: 0.005, P: 0.0:60, Cr: 12.85, Ni: 1.69, Cu: 0.01, and the balance of Fe and inevitable impurities.
6. A method for producing the stainless steel for transmission and transformation engineering according to claims 1 to 5, characterized in that the method comprises the following steps:
(1) performing AOD refining, LF refining and continuous casting on blast furnace molten iron in sequence, and performing slow cooling on a billet obtained by continuous casting to obtain a rolling blank;
(2) the rolling blank heated to the temperature required by rolling is sent to a rolling mill for rolling, and the rolled formed steel is slowly cooled;
(3) quenching and tempering the formed steel according to the application requirement;
(4) and (4) sequentially carrying out whitening treatment, finishing treatment and finished product inspection on the formed steel after the quenching and tempering treatment.
7. The method for producing stainless steel for electric transmission and transformation engineering according to claim 6, wherein the blast furnace molten iron is produced by the following method:
and crushing and screening the nickel-chromium ore, then carrying out batching and sintering and carrying out blast furnace smelting to obtain blast furnace molten iron.
8. The method for producing stainless steel for electric transmission and transformation engineering according to claim 7, wherein the batching process requires adding manganese ore to nichrome ore to reduce the viscosity of the slag.
9. The method for producing stainless steel for electric transmission and transformation engineering according to claim 7, wherein the batching process requires adding binder and catalyst to nichrome ore to improve the cold and hot strength of cold-pressed pellets and carbon-containing pellets.
10. The method for producing stainless steel for electric transmission and transformation engineering according to claim 7, wherein the blast furnace molten iron obtained by blast furnace smelting is directly subjected to AOD refining.
11. The method for producing stainless steel for electric transmission and transformation engineering according to claim 6, wherein the formed steel comprises a bar material, an angle steel and a steel plate.
12. The method for producing stainless steel for power transmission and transformation engineering according to claim 6, wherein the step of subjecting the formed steel to thermal refining according to application requirements comprises:
taking the formed steel materials with the number more than or equal to 1 as samples respectively;
modulating the sample according to different quenching and tempering schemes;
comparing the mechanical property of the sample after the quenching and tempering with the application requirement to obtain an optimal quenching and tempering scheme;
and carrying out thermal refining on the rest formed steel according to the optimal thermal refining scheme.
13. The method for producing stainless steel for electric transmission and transformation engineering according to claim 12, wherein the quenching temperatures of the different quenching and tempering schemes are respectively higher than 700 ℃.
14. The method for producing stainless steel for power transmission and transformation engineering according to claim 6, wherein the whitening treatment comprises descaling, pickling and passivation;
the descaling includes: firstly, polishing and grinding to remove oxide skin, and then polishing by using abrasive cloth to improve the smoothness;
the pickling comprises the following steps: removing oil and cleaning dirt, and then carrying out acid washing for 5-8 min at the temperature of not higher than 75 ℃ by adopting acid washing liquid;
the passivation comprises: firstly soaking the raw materials in a passivation solution, heating to 80 +/-5 ℃, boiling for 15-30 min, cleaning, soaking for more than 15min at 60 +/-5 ℃ in a stainless iron complexing agent, cleaning, soaking and rinsing for 3min in clear water with the chloride ion content of less than 25PPM, and finally drying.
15. The production method of the stainless steel for the power transmission and transformation project according to claim 14, wherein the pickling solution comprises the following components in percentage by mass:
sulfuric acid: 22-25% and nitric acid: 8-10%, hydrofluoric acid: 1.5 percent and the balance of water.
16. The method for producing stainless steel for electric transmission and transformation engineering according to claim 14, wherein the passivation solution comprises an ID4000 passivation solution.
17. The production method of stainless steel for power transmission and transformation engineering according to claim 6, wherein the finished product inspection comprises appearance inspection, dimensional accuracy inspection and mechanical property inspection, and the inspection result meets the application requirement and is a finished product.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111893382A (en) * | 2020-07-20 | 2020-11-06 | 振石集团东方特钢有限公司 | Food chain stainless steel and preparation method thereof |
| CN114107783A (en) * | 2020-08-25 | 2022-03-01 | 中国电力科学研究院有限公司 | High-strength stainless steel fastener and preparation method thereof |
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