CN114875314A - Production method of high-aluminum alloy steel - Google Patents
Production method of high-aluminum alloy steel Download PDFInfo
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- CN114875314A CN114875314A CN202210445675.1A CN202210445675A CN114875314A CN 114875314 A CN114875314 A CN 114875314A CN 202210445675 A CN202210445675 A CN 202210445675A CN 114875314 A CN114875314 A CN 114875314A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000009749 continuous casting Methods 0.000 claims abstract description 21
- 238000010583 slow cooling Methods 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 7
- 238000005204 segregation Methods 0.000 claims description 5
- 239000010425 asbestos Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 238000009987 spinning Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 239000000498 cooling water Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 229910001562 pearlite Inorganic materials 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21D8/06—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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a production method of high-aluminum alloy steel, which comprises the following process routes of smelting, continuous casting, rolling, controlled cooling, slow cooling and warehousing, wherein the steel comprises the following chemical components in percentage by weight: c = 0.35-0.42%, Si = 0.20-0.45%, Mn = 0.30-0.60%, Cr = 1.35-1.65%, Mo = 0.15-0.25%, Al = 0.70-1.10%, P is less than or equal to 0.020%, S is less than or equal to 0.020%, Cu is less than or equal to 0.20%, Ni is less than or equal to 0.30%, and the balance of Fe and inevitable impurities. The invention takes measures aiming at the key working procedures of the high aluminum alloy steel produced by the process flow of converter-refining-continuous casting square billet (150 multiplied by 150 mm) -high-speed wire rolling, the produced high aluminum alloy steel wire rod has the specification of 5.5-17.0 mm and uniform tissue, has no tissue harmful to drawing, and meets the requirement of a user on the annealing-free drawing of the product.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a production method of high-aluminum alloy steel.
Background
With the development of the high-grade die steel industry, the die industry is also developing at a high speed, the requirements on the die steel are continuously improved, and the high-grade die steel has the advantages of uniform material structure, high purity and high stability. In the current main wire production technology, the microstructure of steel mostly takes ferrite and pearlite as main components, and due to high alloy content, small specification and high cooling speed, abnormal structures such as martensite, bainite and the like are easy to occur, so that the steel cannot be directly drawn in the process. Therefore, when processing, the customers need to spheroidize and anneal the wire rod to improve the drawing performance, which increases the production cost and brings great inconvenience to the processing and use of downstream customers.
At present, the production of small square billet steel of high aluminum alloy steel mainly studies the castability, the purity, the homogenization of the structure and the control of the internal quality of molten steel; the castability and purity of molten steel are mainly solved by improving the plasticity of inclusions and reducing the content of inclusions, and the uniformity of the structure is mainly solved by weakening segregation caused in the continuous casting process. At present, the research mainly focuses on continuous casting under light pressure and low superheat degree casting.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for manufacturing high-aluminum alloy steel, which fully utilizes the existing coil production equipment at present, rolls and refines grains at final rolling and ultralow temperature, slowly cools to obtain an original wire rod mainly comprising fine pearlite and ferrite which are dispersedly distributed, saves the spheroidizing annealing time of customers, reduces the cost and effectively improves the production efficiency.
The technical scheme for solving the technical problems is as follows:
a manufacturing method of high aluminum alloy steel comprises the process route of smelting, continuous casting, rolling, controlled cooling, slow cooling and warehousing. The steel comprises the following chemical components in percentage by weight: c = 0.35-0.42%, Si = 0.20-0.45%, Mn = 0.30-0.60%, Cr = 1.35-1.65%, Mo = 0.15-0.25%, Al = 0.70-1.10%, P is less than or equal to 0.020%, S is less than or equal to 0.020%, Cu is less than or equal to 0.20%, Ni is less than or equal to 0.30%, and the balance of Fe and inevitable impurities; the production process comprises the following steps:
(1) smelting: adding a slagging deoxidizer for preliminary deoxidation in the converter tapping process, adjusting Al components in place within 10 minutes after LF slagging deoxidation is completed, and controlling the station-out temperature to be 45-50 ℃ above the liquidus temperature;
(2) continuous casting: weak cooling is adopted, the specific water amount is 0.8L/kg, the target value of the superheat degree of a tundish is 35-40 ℃, a linear high temperature instrument is arranged 2m before the billet passes through a tension leveler, the temperature of the central point of the inner arc surface of a casting blank is measured on line, water distribution of each area is finely adjusted through blank temperature detection, the temperature of the inner arc surface of the casting blank entering the tension leveler is kept at 1100-1150 ℃, and continuous casting segregation is weakened by matching with a crystallizer and tail end electromagnetic stirring;
(3) rolling: controlling the temperature of a casting blank high-temperature section at 1100-1150 ℃ for 70-90 min, controlling rolling, and controlling the final rolling temperature at 1050-1100 ℃;
(4) and (3) controlling cooling: directly cooling by water and slowly cooling after rolling, controlling the spinning temperature at 750-800 ℃, the cooling rate at 3-5 ℃/s, and carrying out high-temperature coil collection at 550-620 ℃;
(5) slow cooling: after the wire rod is coiled on the C-shaped hook, the wire rod quickly enters a semi-closed PF slow cooling area surrounded by asbestos, and the wire rod exits the slow cooling area when the temperature of the wire rod is below 200 ℃, so that an original wire rod tissue which is not harmful to drawing is obtained.
The steel produced by the invention has uniform structure, the austenite grain size of the steel is more than or equal to grade 9, and the structure is ferrite and pearlite. The method is mainly technically characterized in that the method is started from monitoring the billet temperature to finely adjust the secondary cooling strength and the hot charging of the continuous casting, the billet temperature of the center position of the casting billet belonging to different casting times and different casting times in the casting process is controlled to finely adjust water distribution so as to reduce the influence of continuous casting segregation, and the structural design is that a ductile structure taking pearlite and ferrite as a matrix cannot generate a fragile structure harmful to drawing.
The outstanding characteristics and the obvious effects of the invention are mainly reflected in that: the invention creates the billet temperature control technology by itself without the support of the continuous casting soft reduction technology, and weakens the continuous casting segregation influence; the invention adopts a series of new rolling technologies such as stelmor controlled rolling and controlled cooling and II-shaped PF slow cooling area slow cooling surrounded by asbestos, breaks through the limit of a high-speed wire controlled cooling process, gives full play to the advantages of equipment, produces high-aluminum alloy steel with pearlite and ferrite as a matrix, has the strength of 800-900 MPa and surface shrinkage of more than 50 percent and has no harmful tissue to drawing, and promotes the research and development process of high-quality high-alloy steel; the present invention utilizes the existing equipment and technological conditions of steel plant, and has high production efficiency, low power consumption and no increase in investment and production cost.
Drawings
FIG. 1 is a gold photograph of a wire rod according to example 1 of the present invention.
Detailed Description
Example 1
A method for manufacturing high-aluminium alloy steel is carried out by converter, refining, continuous casting and rolling. The chemical components of the finished high aluminum alloy steel obtained by smelting are shown in the table 1, and the balance is Fe and inevitable impurities; the key process steps comprise:
(1) the outlet temperature of VD after soft blowing is 1546 ℃;
(2) the continuous casting secondary cooling water ratio is 0.8L/kg, the superheat degree of a tundish is 35 ℃, the temperature of a tension leveler entering the center point of the inner arc surface of a casting blank is monitored to be 1100-1120 ℃, and secondary cooling water distribution is finely adjusted;
(3) heating the casting blank for 130 minutes, controlling the temperature of a high-temperature section to be 1120 ℃, the time to be 75 minutes and the finish rolling temperature to be 1080 ℃;
(4) after rolling, directly cooling by water and controlling the cooling, wherein the cooling rate is 3.5 ℃/s, and the coil collecting temperature is 600 ℃;
(5) after the coiling, the mixture is slowly cooled and is discharged from a slow cooling area at the temperature of 180 ℃.
Example 2
The manufacturing method of high-aluminium alloy steel is characterized by that it adopts the technological processes of converter-refining-continuous casting-rolling, etc. to make production. The chemical components of the finished high aluminum alloy steel obtained by smelting are shown in the table 1, and the balance is Fe and inevitable impurities; the key process steps comprise:
(1) the outlet temperature of VD after soft blowing is 1549 ℃;
(2) the continuous casting secondary cooling water ratio is 0.8L/kg, the superheat degree of a tundish is 35 ℃, the temperature of a tension leveler entering the center point of the inner arc surface of a casting blank is monitored to be 1100-1120 ℃, and secondary cooling water distribution is finely adjusted;
(3) heating the casting blank for 130 minutes, controlling the temperature of a high-temperature section to be 1120 ℃, the time to be 75 minutes and the finish rolling temperature to be 1080 ℃;
(4) after rolling, directly cooling by water and controlling the cooling, wherein the cooling rate is 3.5 ℃/s, and the coil collecting temperature is 600 ℃;
(5) after the coiling, the mixture is slowly cooled and is discharged from a slow cooling area at the temperature of 160 ℃.
Example 3
A method for manufacturing high-aluminium alloy steel is carried out by converter, refining, continuous casting and rolling. The chemical components of the finished high aluminum alloy steel obtained by smelting are shown in the table 1, and the balance is Fe and inevitable impurities; the key process steps comprise:
(1) the outlet temperature of VD after soft blowing is 1548 ℃;
(2) the secondary cooling specific water amount of the continuous casting is 0.8L/kg, the superheat degree of a tundish is 36 ℃, the temperature of a tension leveler entering the center point of the inner arc surface of the casting blank is monitored to be 1100-1120 ℃, and secondary cooling water distribution is finely adjusted;
(3) heating the casting blank for 130 minutes, controlling the temperature of a high-temperature section to be 1120 ℃, the time to be 75 minutes and the finish rolling temperature to be 1080 ℃;
(4) after rolling, directly cooling by water and controlling the cooling, wherein the cooling rate is 3.5 ℃/s, and the coil collecting temperature is 600 ℃;
(5) after the coiling, the mixture is slowly cooled and is discharged from a slow cooling area at the temperature of 160 ℃.
Example 4
A method for manufacturing high-aluminium alloy steel is carried out by converter, refining, continuous casting and rolling. The chemical components of the finished high aluminum alloy steel obtained by smelting are shown in the table 1, and the balance is Fe and inevitable impurities; the key process steps comprise:
(1) the outlet temperature of VD after soft blowing is 1545 ℃;
(2) the secondary cooling specific water amount of the continuous casting is 0.8L/kg, the superheat degree of a tundish is 36 ℃, the temperature of a tension leveler entering the center point of the inner arc surface of the casting blank is monitored to be 1100-1120 ℃, and secondary cooling water distribution is finely adjusted;
(3) heating the casting blank for 130 minutes, controlling the temperature of a high-temperature section to be 1120 ℃, the time to be 72 minutes and the finish rolling temperature to be 1080 ℃;
(4) after rolling, directly cooling by water and controlling the cooling, wherein the cooling rate is 3.5 ℃/s, and the coil collecting temperature is 600 ℃;
(5) after the coiling, the mixture is slowly cooled and is discharged from a slow cooling area at the temperature of 150 ℃.
Table 1 example chemical composition table (%)
TABLE 2 detection results of metallographic structure of wire rod in examples
Claims (1)
1. A manufacturing method of high aluminum alloy steel comprises the following process routes of smelting, continuous casting, rolling, controlled cooling, slow cooling and warehousing, and is characterized in that: the steel comprises the following chemical components in percentage by weight: c = 0.35-0.42%, Si = 0.20-0.45%, Mn = 0.30-0.60%, Cr = 1.35-1.65%, Mo = 0.15-0.25%, Al = 0.70-1.10%, P is less than or equal to 0.020%, S is less than or equal to 0.020%, Cu is less than or equal to 0.20%, Ni is less than or equal to 0.30%, and the balance of Fe and inevitable impurities; the key process steps comprise:
(1) smelting: adding a slagging deoxidizer for preliminary deoxidation in the converter tapping process, adjusting Al components in place within 10 minutes after LF slagging deoxidation is completed, and controlling the station-out temperature to be 45-50 ℃ above the liquidus temperature;
(2) continuous casting: weak cooling is adopted, the specific water amount is 0.8L/kg, the target value of the superheat degree of a tundish is 35-40 ℃, a linear high temperature instrument is installed 2m before the billet passes through a tension leveler, the temperature of the central point of the inner arc surface of a casting blank is measured on line, water distribution in each area is finely adjusted through billet temperature detection, the temperature of the tension leveler entering the central point of the inner arc surface of the casting blank is kept at 1100-1150 ℃, and continuous casting segregation is weakened by matching with a crystallizer and tail end electromagnetic stirring;
(3) rolling: controlling the temperature of a casting blank high-temperature section to be 1100-1150, the time to be 70-90 min, controlling rolling, and controlling the final rolling temperature to be 1050-1100 ℃;
(4) and (3) controlling cooling: directly cooling by water and slowly cooling after rolling, controlling the spinning temperature at 750-800 ℃, the cooling rate at 3-5 ℃/s, and carrying out high-temperature coil collection at 550-620 ℃;
(5) slow cooling: after the wire rod is coiled on the C-shaped hook, the wire rod quickly enters a semi-closed PF slow cooling area surrounded by asbestos, and the wire rod exits the slow cooling area when the temperature of the wire rod is below 200 ℃, so that an original wire rod tissue which is not harmful to drawing is obtained.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114875295A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for wind power bolt |
| CN116287980A (en) * | 2023-02-08 | 2023-06-23 | 包头钢铁（集团）有限责任公司 | Wire rod for annealing-free corrosion-resistant mechanical part and preparation method thereof |
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| CN109047697A (en) * | 2018-09-25 | 2018-12-21 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of tyre cord steel |
| CN110029275A (en) * | 2019-05-22 | 2019-07-19 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of high voltage transmission line steel |
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