CN117431359A - Smelting method of high-purity alloy cold heading steel - Google Patents
Smelting method of high-purity alloy cold heading steel Download PDFInfo
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- CN117431359A CN117431359A CN202311405046.7A CN202311405046A CN117431359A CN 117431359 A CN117431359 A CN 117431359A CN 202311405046 A CN202311405046 A CN 202311405046A CN 117431359 A CN117431359 A CN 117431359A
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- equal
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- steel
- controlling
- desulfurization
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 32
- 239000010959 steel Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003723 Smelting Methods 0.000 title claims abstract description 14
- 239000000956 alloy Substances 0.000 title claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 8
- 238000010079 rubber tapping Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 208000004434 Calcinosis Diseases 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005275 alloying Methods 0.000 claims abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000002308 calcification Effects 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract description 9
- 230000023556 desulfurization Effects 0.000 abstract description 9
- 238000010273 cold forging Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 102000005298 Iron-Sulfur Proteins Human genes 0.000 description 1
- 108010081409 Iron-Sulfur Proteins Proteins 0.000 description 1
- 238000005272 metallurgy Methods 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- 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
- C21C7/064—Dephosphorising; Desulfurising
-
- 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)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A smelting method of high-purity alloy cold heading steel comprises the following chemical components in percentage by weight: 0.39-0.42%, si:0.17-0.30%, mn:0.65-0.80%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr:0.90-1.10%, al is more than or equal to 0.020%, and the balance is Fe and unavoidable impurities; the key process steps comprise: KR desulfurization, converter, LF high-alkalinity slag refining and continuous casting protection pouring. The key point of the invention is that KR desulfurization, converter oxygen control, carbon end termination and low temperature dephosphorization are performed, then tapping deoxidization alloying is performed, LF furnace control aluminum damage white slag deoxidization desulfurization, no calcification treatment is performed after refining, and continuous casting is performed in a whole process for protecting pouring. The method for smelting the high-purity cold forging steel is developed, and the high-purity alloy cold forging steel is successfully produced by controlling the aluminum loss and the molten steel oxidation in the process.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a smelting method of high-purity alloy cold heading steel.
Background
With the development of metallurgical technology, higher requirements are put on the quality of steel, and how to effectively realize the purity of aluminum-containing molten steel is an important research content in smelting production. Because the conventional smelting is difficult to meet the production of high-purity alloy cold-heading steel, the technical research for producing the high-purity alloy cold-heading steel has important significance.
Disclosure of Invention
The invention aims to provide a smelting method of high-purity alloy cold heading steel. The steel comprises the following chemical components in percentage by weight: c:0.39-0.42%, si:0.17-0.30%, mn:0.65-0.80%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr:0.90-1.10%, al is more than or equal to 0.020%, and the balance is Fe and unavoidable impurities. According to the chemical components and the technical requirements of pure steel, unique technology is adopted in smelting, namely KR desulfurization, converter, LF high-alkalinity slag refining and continuous casting protection pouring. The key point of the invention is that KR desulfurization, converter oxygen control, carbon end termination and low temperature dephosphorization are performed, then tapping deoxidization alloying is performed, LF furnace control aluminum damage white slag deoxidization desulfurization, no calcification treatment is performed after refining, and continuous casting is performed in a whole process for protecting pouring. The method for smelting the high-purity cold forging steel is developed, and the high-purity alloy cold forging steel is successfully produced by controlling the aluminum loss and the molten steel oxidation in the process.
The technical scheme of the invention is as follows:
a smelting method of high-purity alloy cold heading steel comprises the following steps:
(1) KR: desulfurizing, and controlling the sulfur content of molten iron within 0.015%.
(2) And (3) a converter: oxygen control and end carbon protection, low-temperature dephosphorization, and control of less than or equal to 300ppm of O, more than or equal to 0.07% of C and less than or equal to 0.015% of P in molten steel;
(3) Tapping: deoxidizing and alloying, and controlling Al in molten steel: 0.030-0.040%.
(4) LF furnace: making white slag, controlling the alkalinity to be 6-8, controlling the aluminum loss to be less than or equal to 0.01% in the refining process, and performing no calcification treatment and soft blowing to be more than or equal to 20min;
(5) Continuous casting: the whole casting process is protected, and the aluminum loss in the casting process is less than or equal to 0.005 percent.
The invention has the advantages that: through KR desulfurization, converter oxygen control and carbon endpoint protection, low-temperature dephosphorization, then tapping deoxidization alloying, LF furnace control aluminum damage white slag deoxidization desulfurization, no calcification treatment after refining, continuous casting whole-course protection pouring. And successfully producing the high-purity alloy cold heading steel by controlling the aluminum loss and the molten steel oxidation in the process.
Detailed Description
The present invention will be further described with reference to examples.
The KR desulfurization, converter, LF high alkalinity slag refining, continuous casting protection pouring and other technological processes are adopted for production.
Example 1:
a smelting method of high-purity alloy cold heading steel, wherein the specification of a casting blank is 150 multiplied by 150mm. The steel comprises the following chemical components in percentage by weight: c=0.41%, si=0.20%, mn=0.70%, p=0.016%, s=0.007%, cr=1.00%, al=0.033%, the balance being Fe and unavoidable impurities. The production process comprises the following steps:
(1) KR: molten iron sulfur content 0.013%;
(2) And (3) a converter: o=220 ppm, c=0.08%, p=0.012% in the molten steel;
(3) Tapping: al=0.036%;
(4) LF furnace: alkalinity 7.2, aluminum loss in refining process is 0.007%, no calcium line is fed, and soft blowing is carried out for 22min;
(5) Continuous casting: and the whole casting process is protected, and the aluminum loss in the process is 0.003%.
Example 2:
a smelting method of high-purity alloy cold heading steel, wherein the specification of a casting blank is 150 multiplied by 150mm. The steel comprises the following chemical components in percentage by weight: c=0.41%, si=0.21%, mn=0.72%, p=0.018%, s=0.006%, cr=0.98%, al=0.028%, the remainder being Fe and unavoidable impurities. The production process comprises the following steps:
(1) KR: the sulfur content of molten iron is 0.011%;
(2) And (3) a converter: o=240 ppm, c=0.09% and p=0.010% in the molten steel;
(3) Tapping: al=0.035%;
(4) LF furnace: alkalinity is 6.8, aluminum loss in the refining process is 0.006%, no calcium line is fed, and soft blowing is carried out for 25min;
(5) Continuous casting: and the whole casting process is protected, and the aluminum loss in the process is 0.003%.
Claims (1)
1. A smelting method of high-purity alloy cold heading steel is characterized by comprising the following steps: the steel comprises the following chemical components in percentage by weight: 0.39-0.42%, si:0.17-0.30%, mn:0.65-0.80%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr:0.90-1.10%, al is more than or equal to 0.020%, and the balance is Fe and unavoidable impurities; the method comprises the following process steps:
(1) KR: desulfurizing, and controlling the sulfur content of molten iron within 0.015%.
(2) And (3) a converter: oxygen control and end carbon protection, low-temperature dephosphorization, and control of less than or equal to 300ppm of O, more than or equal to 0.07% of C and less than or equal to 0.015% of P in molten steel;
(3) Tapping: deoxidizing and alloying, and controlling Al in molten steel: 0.030-0.040%.
(4) LF furnace: making white slag, controlling the alkalinity to be 6-8, controlling the aluminum loss to be less than or equal to 0.01% in the refining process, and performing no calcification treatment and soft blowing to be more than or equal to 20min;
(5) Continuous casting: the whole casting process is protected, and the aluminum loss in the casting process is less than or equal to 0.005 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311405046.7A CN117431359A (en) | 2023-10-27 | 2023-10-27 | Smelting method of high-purity alloy cold heading steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311405046.7A CN117431359A (en) | 2023-10-27 | 2023-10-27 | Smelting method of high-purity alloy cold heading steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117431359A true CN117431359A (en) | 2024-01-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311405046.7A Pending CN117431359A (en) | 2023-10-27 | 2023-10-27 | Smelting method of high-purity alloy cold heading steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117431359A (en) |
-
2023
- 2023-10-27 CN CN202311405046.7A patent/CN117431359A/en active Pending
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