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A method for producing high-formability steel plates using a medium-heavy plate rolling mill and the steel plates produced therefor

A high-forming, steel plate technology, used in the manufacture of converters and other directions, can solve the problems of low strength level, elongation and low temperature impact value, difficult to meet the processing conditions of downstream users, affecting elongation and low temperature impact, etc. Improve performance, eliminate mixed crystal defects, and have good cold bending performance

Inactive Publication Date: 2015-08-12
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The application number is 201210141135.0, and the patent name of the invention is "a low-cost high-ductility cold-formed steel with a tensile strength of 500 MPa and its manufacturing method". The patent adopts the design of economical strengthening elements C and Ti at low cost; The rolling-coiling process produces cold-formed steel with a tensile strength of 500 MPa. Except that the production process is substantially different from that of the present invention, the patent’s physical quality is in terms of strength level, elongation and low-temperature impact value. are low, it is difficult to meet the complex and harsh processing conditions of downstream users
[0006] The application number is 200410017552.X, and the patent name of the invention is "a hot-rolled low-carbon bainite composite material and its preparation process". The patent uses Si-Mn-B as the main alloying element, through microalloying and control Rolling controlled cold-coiling process production, its composition design is characterized by high Si, high Mn, and B addition. While this composition design improves strength, it will inevitably affect elongation, cold bending, and low-temperature impact, and its values ​​are relatively low. Causes cracking during subsequent cold working

Method used

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  • A method for producing high-formability steel plates using a medium-heavy plate rolling mill and the steel plates produced therefor
  • A method for producing high-formability steel plates using a medium-heavy plate rolling mill and the steel plates produced therefor
  • A method for producing high-formability steel plates using a medium-heavy plate rolling mill and the steel plates produced therefor

Examples

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Effect test

Embodiment 1

[0054] A method for producing a high-formability steel plate using a plate rolling mill, comprising the following steps:

[0055] (1) Desulfurization treatment of KR molten iron: During the desulfurization treatment process of KR molten iron, the temperature of molten iron after pretreatment is controlled at 1356°C, and the weight percentage of S in the treated molten iron is 0.001%.

[0056] (2) Converter smelting: During the converter smelting process, the weight percentages of the components at the end of the converter are controlled at C 0.041%, Si 0.0045%, S 0.009%, and P 0.012%, and the temperature at the end of the converter is controlled at 1640°C; Slag melting, high gun position as soon as possible to slag dephosphorization; ensure that the end point temperature and carbon hit at the same time, require a carbon pulling operation, and point blowing is strictly prohibited to reduce the hydrogen and nitrogen content of molten steel; use slag stoppers and slag stop rods to...

Embodiment 2

[0076] A method for producing a high-formability steel plate using a plate rolling mill, comprising the following steps:

[0077] (1) Desulfurization treatment of KR molten iron: During the desulfurization process of KR molten iron, the temperature of molten iron after pretreatment is controlled at 1371°C, and the weight percentage of S in the treated molten iron is 0.003%.

[0078] (2) Converter smelting: During the converter smelting process, the weight percentages of the components at the end of the converter are controlled at C 0.056%, Si 0.0005%, S 0.010%, and P 0.086%, and the temperature at the end of the converter is controlled at 1645°C; Slag melting, high gun position as soon as possible to slag dephosphorization; ensure that the end point temperature and carbon hit at the same time, require a carbon pulling operation, and point blowing is strictly prohibited to reduce the hydrogen and nitrogen content of molten steel; use slag stoppers and slag stop rods to stop slag...

Embodiment 3

[0097] A method for producing a high-formability steel plate using a plate rolling mill, comprising the following steps:

[0098] (1) KR hot metal desulfurization treatment: During the KR hot metal desulfurization process, the temperature of the hot metal after pretreatment is controlled at 1367°C, and the weight percentage of S in the treated hot metal is 0.002%.

[0099] (2) Converter smelting: During the converter smelting process, the weight percentages of the components at the end of the converter are controlled at C 0.061%, Si 0.003%, S 0.008%, and P 0.010%, and the temperature at the end of the converter is controlled at 1650°C; Slag melting, high gun position as soon as possible to slag dephosphorization; ensure that the end point temperature and carbon hit at the same time, require a carbon pulling operation, and point blowing is strictly prohibited to reduce the hydrogen and nitrogen content of molten steel; use slag stoppers and slag stop rods to stop slag discharge ...

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Abstract

The invention belongs to the technical field of steel plate production, and particularly relates to a method for producing a high-formability steel plate by using a heavy and medium plate mill and the steel plate manufactured by the method. The method for producing the high-formability steel plate by using the heavy and medium plate mill comprises the following steps of (1) carrying out molten iron desulphurization treatment in a KR (Kambara reactor); (2) smelting in a converter; (3) deoxidizing and alloying: (4) refining in an LF (Ladle Furnace); (5) carrying out full-protective casting; (6) treating a continuous casting billet; and (7) carrying out precision rolling. The method is simple and convenient to operate. The high-formability steel plate produced by the method has excellent formability, low welding crack sensitivity and good low-temperature impact toughness.

Description

technical field [0001] The invention belongs to the technical field of steel plate production, and in particular relates to a method for producing a high-formability steel plate by using a medium-thick plate rolling mill and the prepared steel plate. Background technique [0002] In recent years, industries such as heavy-duty special vehicles and construction machinery in downstream industries have continuously put forward requirements for upgrading and lightweight design. The requirements for the strength level and performance of steel are becoming more and more stringent, and the materials are required to have good weldability and formability. To meet the needs of construction machinery, vehicle structures, containers, mining, construction, fire protection and agricultural machinery products in harsh operating environments. The high-formability products currently used at home and abroad are mainly high-yield-strength steels with improved formability such as automobile beam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/02C21C5/28C21C7/06
Inventor 胡淑娥侯东华刘晓东冯勇蒋学庆于彦飞
Owner JIGANG GRP
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