CN112609035A - Production method of cold-resistant steel for automobile structural pipe - Google Patents

Production method of cold-resistant steel for automobile structural pipe Download PDF

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Publication number
CN112609035A
CN112609035A CN202011549533.7A CN202011549533A CN112609035A CN 112609035 A CN112609035 A CN 112609035A CN 202011549533 A CN202011549533 A CN 202011549533A CN 112609035 A CN112609035 A CN 112609035A
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CN
China
Prior art keywords
steel
adopting
rolling
refining
cold
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011549533.7A
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Chinese (zh)
Inventor
陈伟
宋才元
张建华
张小华
李海涛
宋殿飞
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Changzhou Dongfang Special Steel Co ltd
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Changzhou Dongfang Special Steel Co ltd
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Publication date
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Priority to CN202011549533.7A priority Critical patent/CN112609035A/en
Publication of CN112609035A publication Critical patent/CN112609035A/en
Pending legal-status Critical Current

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    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • 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
    • 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
    • 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
    • C21C7/076—Use of slags or fluxes as treating agents
    • 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
    • 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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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

Abstract

The invention relates to the technical field of steel production, in particular to a production method of cold-resistant steel for an automobile structural tube. According to the production method of the cold-resistant steel for the automobile structural pipe, disclosed by the invention, a proper amount of alloying elements are added in the molten steel smelting process to adjust and improve the structure and the performance of the steel for the automobile structural pipe, so that the automobile structural pipe can still keep qualified toughness in northern areas or export cold areas such as Russia and the like.

Description

Production method of cold-resistant steel for automobile structural pipe
Technical Field
The invention relates to the technical field of steel production, in particular to a production method of cold-resistant steel for an automobile structural pipe.
Background
The temperature in winter in northern areas is reduced, and the environmental temperature can reach below 40 ℃ below zero and is lower than the brittle transition temperature of conventional materials. In the conventional steel for the structural pipe of the automobile, the toughness of the material is reduced due to the cold brittleness tendency under the low-temperature environment, and cold brittleness fracture may occur, so that the safety performance of the automobile is seriously influenced.
Disclosure of Invention
In order to overcome the defect that the toughness of the material is reduced and the material is fractured due to cold-brittle inclination of the existing steel for the automobile structural pipe in a low-temperature environment, the invention provides a production method of the steel for the cold-resistant automobile structural pipe.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production method of cold-resistant steel for an automobile structural pipe comprises the following steps:
the method comprises the following steps: selecting materials: selecting high-quality scrap steel and blast furnace molten iron;
step two: LD smelting: adding a slag former into a 100-ton alkaline oxygen top-bottom combined blowing converter for smelting, and performing decarburization, heating and impurity removal to form primary molten steel; carrying out deoxidation alloying by adopting Al blocks, silicon-manganese alloy, ferromanganese alloy and refined slag charge after the furnace;
step three: LF refining: refining operation is carried out by adopting a 120-ton LF ladle refining furnace;
step four: the refining in the third step is specifically carried out as follows: (1) deoxidizing by adopting silicon-calcium-barium, silicon carbide and Al particles, removing free oxygen in the molten steel, and reducing inclusions in the molten steel; (2) adjusting slag system components of the refining slag by adopting fluorite and the refining slag to form a slag system which is easy to adsorb impurities; (3) adopting medium-carbon ferrochrome, ferrovanadium and ferroniobium to carry out molten steel alloying adjustment; adding alloy elements, heating by an electrode, sampling and testing components after the alloy is completely melted, and finely adjusting the components to form molten steel;
step five: continuous casting: adopting an R10m continuous casting machine to carry out continuous casting operation, and adopting a casting blank specification of 200 x 200mm2The compression ratio is more than or equal to 8; slowly cooling the casting blank, and inspecting and judging to obtain a qualified casting blank;
step six: steel rolling: a step-by-step heating furnace is adopted to heat the casting blank, so that the heating time is prolonged, and the requirement of a banded structure is met; descaling by adopting high-pressure water, ensuring the surface quality and ensuring that the surface of the red blank has no iron scale; rolling by adopting 10 frames of horizontal and vertical cross rolling mills, and finally rolling into phi 80 round steel after primary rolling, intermediate rolling and finish rolling;
step seven: and (3) finishing: after the round steel is sawed and cooled, the round steel is ensured to be free of defects through finishing measures such as straightening, chamfering and the like and eddy current and ultrasonic flaw detection measures; and finishing grinding, inspection, judgment and packaging to finally form a finished product.
Further, the specific chemical compositions (mass fraction)% of the alloy elements in the fourth step are as follows: 0.13-0.18% of C, 0.15-0.35% of Si, 1.40-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.20-0.35% of Cr, 0.50-0.80% of Ni, 0.015-0.030% of Alt and 0.03-0.05% of Nb.
The production method of the cold-resistant steel for the automobile structural pipe has the beneficial effects that the proper amount of alloying elements are added in the molten steel smelting process to adjust and improve the structure and the performance of the steel for the automobile structural pipe, so that the automobile structural pipe can still keep qualified toughness in northern areas or export Russian and other cold areas.
Detailed Description
A production method of cold-resistant steel for an automobile structural pipe comprises the following steps:
the method comprises the following steps: selecting materials: selecting high-quality scrap steel and blast furnace molten iron;
step two: LD smelting: adding a slag former into a 100-ton alkaline oxygen top-bottom combined blowing converter for smelting, and performing decarburization, heating and impurity removal to form primary molten steel; carrying out deoxidation alloying by adopting Al blocks, silicon-manganese alloy, ferromanganese alloy and refined slag charge after the furnace;
step three: LF refining: refining operation is carried out by adopting a 120-ton LF ladle refining furnace;
step four: the refining in the third step is specifically carried out as follows: (1) deoxidizing by adopting silicon-calcium-barium, silicon carbide and Al particles, removing free oxygen in the molten steel, and reducing inclusions in the molten steel; (2) adjusting slag system components of the refining slag by adopting fluorite and the refining slag to form a slag system which is easy to adsorb impurities; (3) adopting medium-carbon ferrochrome, ferrovanadium and ferroniobium to carry out molten steel alloying adjustment; adding alloy elements, heating by an electrode, sampling and testing components after the alloy is completely melted, and finely adjusting the components to form molten steel;
step five: continuous casting: adopting an R10m continuous casting machine to carry out continuous casting operation, and adopting a casting blank specification of 200 x 200mm2The compression ratio is more than or equal to 8; slowly cooling the casting blank, and inspecting and judging to obtain a qualified casting blank;
step six: steel rolling: a step-by-step heating furnace is adopted to heat the casting blank, so that the heating time is prolonged, and the requirement of a banded structure is met; descaling by adopting high-pressure water, ensuring the surface quality and ensuring that the surface of the red blank has no iron scale; rolling by adopting 10 frames of horizontal and vertical cross rolling mills, and finally rolling into phi 80 round steel after primary rolling, intermediate rolling and finish rolling;
step seven: and (3) finishing: after the round steel is sawed and cooled, the round steel is ensured to be free of defects through finishing measures such as straightening, chamfering and the like and eddy current and ultrasonic flaw detection measures; and finishing grinding, inspection, judgment and packaging to finally form a finished product.
Further, the specific chemical compositions (mass fraction)% of the alloy elements in the fourth step are as follows: 0.13-0.18% of C, 0.15-0.35% of Si, 1.40-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.20-0.35% of Cr, 0.50-0.80% of Ni, 0.015-0.030% of Alt and 0.03-0.05% of Nb.
The first embodiment is as follows: high-quality scrap steel and blast furnace molten iron are adopted, cold-resistant steel for the automobile structural pipe is prepared by LD smelting, LF refining, continuous casting, steel rolling and finishing, a proper amount of alloying elements are added in the molten steel smelting process, the structure and the performance of the steel for the automobile structural pipe are adjusted and improved, so that the automobile structural pipe can still keep qualified toughness in northern areas or cold areas such as export Russia and the like, and the specific chemical components (mass fraction)% of the specific alloying elements are as follows: 0.13-0.18% of C, 0.15-0.35% of Si, 1.40-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.20-0.35% of Cr, 0.50-0.80% of Ni, 0.015-0.030% of Alt and 0.03-0.05% of Nb. .
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (2)

1. A production method of cold-resistant steel for an automobile structural pipe is characterized by comprising the following steps:
the method comprises the following steps: selecting materials: selecting high-quality scrap steel and blast furnace molten iron;
step two: LD smelting: adding a slag former into a 100-ton alkaline oxygen top-bottom combined blowing converter for smelting, and performing decarburization, heating and impurity removal to form primary molten steel; carrying out deoxidation alloying by adopting Al blocks, silicon-manganese alloy, ferromanganese alloy and refined slag charge after the furnace;
step three: LF refining: refining operation is carried out by adopting a 120-ton LF ladle refining furnace;
step four: the refining in the third step is specifically carried out as follows: (1) deoxidizing by adopting silicon-calcium-barium, silicon carbide and Al particles, removing free oxygen in the molten steel, and reducing inclusions in the molten steel; (2) adjusting slag system components of the refining slag by adopting fluorite and the refining slag to form a slag system which is easy to adsorb impurities; (3) adopting medium-carbon ferrochrome, ferrovanadium and ferroniobium to carry out molten steel alloying adjustment; adding alloy elements, heating by an electrode, sampling and testing components after the alloy is completely melted, and finely adjusting the components to form molten steel;
step five: continuous casting: adopting an R10m continuous casting machine to carry out continuous casting operation, and adopting a casting blank specification of 200 x 200mm2The compression ratio is more than or equal to 8; slowly cooling the casting blank, and inspecting and judging to obtain a qualified casting blank;
step six: steel rolling: a step-by-step heating furnace is adopted to heat the casting blank, so that the heating time is prolonged, and the requirement of a banded structure is met; descaling by adopting high-pressure water, ensuring the surface quality and ensuring that the surface of the red blank has no iron scale; rolling by adopting 10 frames of horizontal and vertical cross rolling mills, and finally rolling into phi 80 round steel after primary rolling, intermediate rolling and finish rolling;
step seven: and (3) finishing: after the round steel is sawed and cooled, the round steel is ensured to be free of defects through finishing measures such as straightening, chamfering and the like and eddy current and ultrasonic flaw detection measures; and finishing grinding, inspection, judgment and packaging to finally form a finished product.
2. The method for producing cold-resistant steel for structural pipes of automobiles according to claim 1, wherein the specific chemical compositions (mass fraction)% of the alloy elements in the fourth step are: 0.13-0.18% of C, 0.15-0.35% of Si, 1.40-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.20-0.35% of Cr, 0.50-0.80% of Ni, 0.015-0.030% of Alt and 0.03-0.05% of Nb.
CN202011549533.7A 2020-12-24 2020-12-24 Production method of cold-resistant steel for automobile structural pipe Pending CN112609035A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114438396A (en) * 2021-12-23 2022-05-06 常州东方特钢有限公司 Production method of round steel for high-strength bolt for severe cold resistant power transmission tower

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114438396A (en) * 2021-12-23 2022-05-06 常州东方特钢有限公司 Production method of round steel for high-strength bolt for severe cold resistant power transmission tower

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Application publication date: 20210406