CN115058556B - Method for accurately controlling carbon and manganese components of deformed steel bar - Google Patents
Method for accurately controlling carbon and manganese components of deformed steel bar Download PDFInfo
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- CN115058556B CN115058556B CN202210868465.3A CN202210868465A CN115058556B CN 115058556 B CN115058556 B CN 115058556B CN 202210868465 A CN202210868465 A CN 202210868465A CN 115058556 B CN115058556 B CN 115058556B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 74
- 239000010959 steel Substances 0.000 title claims abstract description 74
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 73
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 49
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 37
- 239000011572 manganese Substances 0.000 title claims abstract description 37
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 29
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000007670 refining Methods 0.000 claims abstract description 19
- 238000009628 steelmaking Methods 0.000 claims abstract description 16
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 238000010079 rubber tapping Methods 0.000 claims description 22
- 229910045601 alloy Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 15
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 238000009749 continuous casting Methods 0.000 claims description 9
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 229910000514 dolomite Inorganic materials 0.000 claims description 5
- 239000010459 dolomite Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 229910000676 Si alloy Inorganic materials 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000002436 steel type Substances 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
Classifications
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C7/0025—Adding carbon material
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the technical field of steelmaking technology, and relates to a method for accurately controlling the components of threaded steel, namely manganese and carbon in molten steel can be directly regulated by small-package high-carbon ferromanganese and carbon wires in a CAS refining process without adopting an LF refining process, so that the method is a new way for accurately controlling the manganese and carbon content in the threaded steel, is more obvious in appearance especially for the threaded steel with a short smelting period, has a hit rate of the narrow component of the threaded steel of more than 99%, solves the problem of high control difficulty of the component of the threaded steel, realizes high-efficiency production, and has higher practical popularization value.
Description
Technical Field
The invention belongs to the technical field of steelmaking technology, and relates to a method for accurately controlling carbon and manganese components of deformed steel bars.
Background
The screw thread steel composition control is strict, and the hot-rolling process has more strict requirements on the screw thread steel composition. The threaded steel is usually produced by adopting a converter steelmaking process, a CAS refining process and a continuous casting process, the smelting period is about 25 minutes, and the precise control difficulty of carbon and manganese components is high due to the fast production rhythm, and an LF furnace refining process is required, so that the treatment period and the production cost are increased, and a simple and convenient method for precisely controlling the carbon and manganese components of the threaded steel is needed.
Disclosure of Invention
Therefore, the invention aims to provide a method for precisely controlling the carbon and manganese components of the deformed steel bar, which can precisely control the carbon and manganese components of the deformed steel bar and reduce the improvement caused by the carbon and manganese.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for precisely controlling carbon and manganese components of deformed steel bar comprises the following steps:
s1, carrying out converter steelmaking on molten iron, wherein the carbon content of a converter steelmaking end point is controlled to be 0.03-0.08%;
s2, tapping by a converter, adding high-carbon ferromanganese, manganese silicon and ferrosilicon alloy in the tapping process, controlling carbon content of molten steel to be more than or equal to 0.21%, manganese content to be more than or equal to 1.35%, and performing bottom blowing stirring in the whole tapping process;
s3, refining the molten steel by CAS (control of the refining time to 8-10 minutes), and immediately sampling and analyzing components by CAS;
s4, according to analysis results, adjusting carbon and manganese contents of molten steel through carbon wires and high-carbon ferromanganese in a CAS refining process.
Optionally, in the step S1, the blast furnace molten iron enters a converter for steelmaking, and specifically comprises the following steps: and (3) carrying out converter steelmaking on the blast furnace molten iron, adding auxiliary materials in the converter smelting process, and controlling the converter endpoint temperature to be 1645-1680 ℃.
Optionally, the consumption of the auxiliary materials and the metallurgical lime is 28-34 kg/t, the magnesium balls are 7.5-10 kg/t, and the dolomite is 1-15 kg/t; the auxiliary materials comprise the following chemical components in percentage by mass: metallurgical lime: caO is more than or equal to 85%, and activity is more than or equal to 320ml; magnesium balls: mgO is more than or equal to 70 percent, siO2 is less than or equal to 5 percent; dolomite: mgO is more than or equal to 21 percent and SiO2 is less than or equal to 3 percent.
Optionally, in the step S2, tapping by a converter to adjust molten steel components, controlling carbon content of the molten steel to be more than or equal to 0.21%, manganese content to be more than or equal to 1.35%, and controlling carbon content and manganese content in the molten steel to be the upper limit value required by steel types, wherein the method specifically comprises the following steps: tapping by a converter, and adding alloy into molten steel in the tapping process.
Optionally, the alloy is high-carbon ferromanganese, manganese silicon and ferrosilicon, the dosage of the high-carbon ferromanganese is 11-13 kg/t, the dosage of the ferromanganese is 8-9 kg/t, and the dosage of the ferrosilicon is 2-2.5 kg/t; the alloy comprises the following chemical components in percentage by mass: high-carbon ferromanganese: mn is more than or equal to 65 percent, C is less than or equal to 7 percent; mn of the manganese-silicon alloy is more than or equal to 65 percent, si is more than or equal to 17 percent; si of ferrosilicon is more than or equal to 72 percent.
Optionally, in the step S3, the molten steel is subjected to CAS refining, and the alloy content of carbon and manganese in the molten steel is adjusted according to a rapid separation result, and the molten steel is subjected to bottom blowing stirring for 3 minutes to be subjected to continuous casting.
Optionally, the alloy comprises the following chemical components in percentage by mass: high-carbon ferromanganese: mn is more than or equal to 65 percent, C is less than or equal to 7 percent; carbon wire: c is more than or equal to 95%, the single weight of the carbon wire core powder is more than or equal to 144g/m, and the single weight of the iron sheet is 125 g/m-175 g/m.
Optionally, the molten steel is subjected to continuous casting, and the continuous casting pulling speed is 2.4 m/min-2.8 m/min.
The invention has the beneficial effects that:
1. according to the method for precisely controlling the carbon and manganese components of the deformed steel bar, provided by the invention, the process route of converter steelmaking, CAS refining and continuous casting is adopted to obtain the deformed steel bar with narrow component control, an LF process is not needed, the production period is shortened, the efficiency is improved, and the production cost is further reduced;
2. according to the method for accurately controlling the carbon and manganese components of the threaded steel, ferromanganese, manganese silicon and carbon powder are added in the tapping process of the converter, the molten steel components are uniformly mixed by bottom blowing in the whole tapping process, and the molten steel components are adjusted to the lower limit. The molten steel is sampled immediately after being fed into CAS from the converter procedure, and is fed into a rapid separation chamber to analyze the molten steel components, and according to the analysis result, carbon wires are fed into the steel or 10 kg/ladle of high-carbon ferromanganese is manually added into the steel to adjust the carbon and manganese contents of the molten steel.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
The key points of the invention include:
(1) adding ferromanganese, manganese silicon and carbon powder in the tapping process of the converter, carrying out bottom blowing stirring in the whole tapping process, homogenizing molten steel components, and adjusting the molten steel components to the lower limit.
(2) The molten steel is sampled immediately after the CAS from the converter process, and is sent to a rapid separation chamber for analysis of molten steel components.
(3) According to the analysis result, feeding carbon wires into the steel or manually adding 10 kg/ladle of high-carbon ferromanganese to adjust the carbon and manganese content of the molten steel.
The method has simple and convenient process, can directly adjust molten steel manganese and carbon by using small-package high-carbon ferromanganese and carbon wires in the CAS refining process without adopting an LF refining process, is a new way for accurately controlling the manganese and carbon content of the threaded steel, and has higher practical popularization value, and particularly has more obvious expression aiming at the threaded steel with short smelting period, the hit rate of the narrow components of the threaded steel can reach more than 99 percent, the problem of high control difficulty of the components of the threaded steel is solved, and the high-efficiency production is realized.
In order to solve the problem of high difficulty in controlling the components of the existing deformed steel bar, the invention provides a simple and efficient accurate component control method, which can simplify the process flow and accurately control the carbon and manganese contents of the deformed steel bar, and specifically comprises the following steps:
carrying out converter steelmaking on molten iron, wherein the carbon content of the converter steelmaking end point is controlled to be 0.03-0.08%;
and (3) tapping in a converter, adding high-carbon ferromanganese, ferromanganese silicon and ferrosilicon alloy in the tapping process, controlling carbon of molten steel to be more than or equal to 0.21%, manganese to be more than or equal to 1.35%, and stirring in a bottom blowing way in the whole tapping process.
Refining the molten steel by CAS (control of the refining time to 8-10 minutes), and immediately sampling and analyzing the components by the CAS;
according to the analysis result, the carbon and manganese content of molten steel is adjusted through carbon wires and high-carbon ferromanganese in the CAS refining process.
The blast furnace molten iron enters a converter for steelmaking, and specifically comprises the following steps:
the blast furnace molten iron is subjected to converter steelmaking, auxiliary materials are added in the converter smelting process, the dosage of the auxiliary materials is 28-34 kg/t, the dosage of the metallurgical lime is 7.5-10 kg/t, the dosage of the magnesium balls is 1-15 kg/t, and the end temperature of the converter is controlled at 1645-1680 ℃.
The auxiliary materials comprise the following chemical components in percentage by mass:
metallurgical lime: caO is more than or equal to 85%, and activity is more than or equal to 320ml; magnesium balls: mgO is more than or equal to 70 percent, siO2 is less than or equal to 5 percent; dolomite: mgO is more than or equal to 21 percent and SiO2 is less than or equal to 3 percent.
The converter tapping adjusts the molten steel components, controls the carbon content of the molten steel to be more than or equal to 0.21 percent, controls the manganese content of the molten steel to be more than or equal to 1.35 percent, controls the carbon and manganese content in the molten steel to be the upper limit value required by steel types, and specifically comprises the following steps:
and tapping in a converter, wherein high-carbon ferromanganese, ferromanganese silicon and ferrosilicon are added into molten steel in the tapping process, the high-manganese consumption is 11-13 kg/t, the manganese-silicon alloy is 8-9 kg/t, and the ferrosilicon is 2-2.5 kg/t.
The alloy comprises the following chemical components in percentage by mass:
high-carbon ferromanganese: mn is more than or equal to 65 percent, C is less than or equal to 7 percent; mn of the manganese-silicon alloy is more than or equal to 65 percent, si is more than or equal to 17 percent; si of ferrosilicon is more than or equal to 72 percent.
And (3) refining the molten steel by CAS, adjusting the carbon and manganese content of the molten steel according to the rapid separation result, and stirring for 3 minutes by bottom blowing to obtain continuous casting.
The alloy comprises the following chemical components in percentage by mass: high-carbon ferromanganese: mn is more than or equal to 65 percent, C is less than or equal to 7 percent; carbon wire: c is more than or equal to 95%, the single weight of the carbon wire core powder is more than or equal to 144g/m, and the single weight of the iron sheet is 125 g/m-175 g/m.
Molten steel is continuously cast, and the continuous casting drawing speed is 2.4 m/min-2.8 m/min.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (4)
1. The method for precisely controlling the carbon and manganese components of the deformed steel bar is characterized by comprising the following steps of:
s1, carrying out converter steelmaking on molten iron, wherein the carbon content of a converter steelmaking end point is controlled to be 0.03-0.08%;
s2, tapping by a converter, adding high-carbon ferromanganese, manganese silicon and ferrosilicon alloy in the tapping process, controlling carbon content of molten steel to be more than or equal to 0.21%, manganese content to be more than or equal to 1.35%, and performing bottom blowing stirring in the whole tapping process;
the converter tapping adjusts the molten steel components, controls the content of carbon and manganese in the molten steel to be the upper limit value required by steel types, and specifically comprises the following steps: tapping by a converter, and adding alloy into molten steel in the tapping process;
the alloy is high-carbon ferromanganese, ferromanganese and ferrosilicon, the consumption of the high-carbon ferromanganese is 11-13 kg/t, the consumption of the ferromanganese and the ferromanganese is 8-9 kg/t, and the consumption of the ferrosilicon is 2-2.5 kg/t; the alloy comprises the following chemical components in percentage by mass: high-carbon ferromanganese: mn is more than or equal to 65 percent, C is less than or equal to 7 percent; mn of the manganese-silicon alloy is more than or equal to 65 percent, si is more than or equal to 17 percent; si of ferrosilicon is more than or equal to 72 percent;
s3, refining the molten steel by CAS (control of the refining time to 8-10 minutes), and immediately sampling and analyzing components by CAS;
the molten steel is subjected to CAS refining, the alloy content of carbon and manganese in the molten steel is adjusted according to the rapid separation result, and continuous casting is carried out after bottom blowing stirring for 3 minutes;
the alloy comprises the following chemical components in percentage by mass: high-carbon ferromanganese: mn is more than or equal to 65 percent, C is less than or equal to 7 percent; carbon wire: c is more than or equal to 95 percent, the single weight of the carbon wire core powder is more than or equal to 144g/m, and the single weight of the iron sheet is 125 g/m-175 g/m;
s4, according to analysis results, adjusting carbon and manganese contents of molten steel through carbon wires and high-carbon ferromanganese in a CAS refining process.
2. The method for precisely controlling the carbon and manganese components of the deformed steel bar according to claim 1, which is characterized by comprising the following steps: in the step S1, the blast furnace molten iron enters a converter for steelmaking, and specifically comprises the following steps: and (3) carrying out converter steelmaking on the blast furnace molten iron, adding auxiliary materials in the converter smelting process, and controlling the converter endpoint temperature to be 1645-1680 ℃.
3. The method for precisely controlling the carbon and manganese components of the deformed steel bar according to claim 2, which is characterized by comprising the following steps: the consumption of auxiliary materials is 28-34 kg/t of metallurgical lime, 7.5-10 kg/t of magnesium balls and 1-15 kg/t of dolomite; the auxiliary materials comprise the following chemical components in percentage by mass: metallurgical lime: caO is more than or equal to 85%, and activity is more than or equal to 320ml; magnesium balls: mgO is more than or equal to 70 percent, siO2 is less than or equal to 5 percent; dolomite: mgO is more than or equal to 21 percent and SiO2 is less than or equal to 3 percent.
4. The method for precisely controlling the carbon and manganese components of the deformed steel bar according to claim 1, which is characterized by comprising the following steps: molten steel is continuously cast, and the continuous casting drawing speed is 2.4 m/min-2.8 m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210868465.3A CN115058556B (en) | 2022-07-22 | 2022-07-22 | Method for accurately controlling carbon and manganese components of deformed steel bar |
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| CN115058556B true CN115058556B (en) | 2024-01-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007091700A1 (en) * | 2006-02-09 | 2007-08-16 | Jfe Steel Corporation | Method of denitrifying molten steel |
| CN102828098A (en) * | 2012-09-25 | 2012-12-19 | 鞍钢股份有限公司 | Method for increasing molten steel finishing point manganese content by adding manganese ore outside furnace |
| CN103205628A (en) * | 2013-04-26 | 2013-07-17 | 内蒙古包钢钢联股份有限公司 | Production method of HRB400 (Rockwell Hardness) deformed steel bar |
| KR20140013178A (en) * | 2012-07-20 | 2014-02-05 | 주식회사 포스코 | Method for producing steel |
| WO2015192391A1 (en) * | 2014-06-18 | 2015-12-23 | 江苏省沙钢钢铁研究院有限公司 | Rebar and preparation method thereof |
-
2022
- 2022-07-22 CN CN202210868465.3A patent/CN115058556B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007091700A1 (en) * | 2006-02-09 | 2007-08-16 | Jfe Steel Corporation | Method of denitrifying molten steel |
| KR20140013178A (en) * | 2012-07-20 | 2014-02-05 | 주식회사 포스코 | Method for producing steel |
| CN102828098A (en) * | 2012-09-25 | 2012-12-19 | 鞍钢股份有限公司 | Method for increasing molten steel finishing point manganese content by adding manganese ore outside furnace |
| CN103205628A (en) * | 2013-04-26 | 2013-07-17 | 内蒙古包钢钢联股份有限公司 | Production method of HRB400 (Rockwell Hardness) deformed steel bar |
| WO2015192391A1 (en) * | 2014-06-18 | 2015-12-23 | 江苏省沙钢钢铁研究院有限公司 | Rebar and preparation method thereof |
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