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Production method of low-carbon hot-rolled thin steel plate with multi-layer organizational structure

A hot-rolled thin steel plate and structure technology, applied in the field of metallurgy, can solve the problems of high cost, poor ductility at the edge of homogeneous steel plate, and easy cracks in forming

Active Publication Date: 2021-09-07
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of poor ductility at the edge of homogeneous steel plates, easy cracks in forming after punching, high cost, and complex production process of composite plates or gradient materials, the invention provides a production method of low-carbon hot-rolled thin steel plates with a multi-layer structure

Method used

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  • Production method of low-carbon hot-rolled thin steel plate with multi-layer organizational structure
  • Production method of low-carbon hot-rolled thin steel plate with multi-layer organizational structure
  • Production method of low-carbon hot-rolled thin steel plate with multi-layer organizational structure

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Embodiment 1

[0019] A method for producing a low-carbon hot-rolled steel sheet with a multi-layer structure, the chemical composition and mass percentage of the low-carbon hot-rolled steel sheet: C: 0.05%, Si: 0.03%, Mn: 0.12%, P: 0.010 %, S: 0.003%, Als: 0.035%, and the balance is Fe and unavoidable impurities.

[0020] The production method of the low-carbon hot-rolled thin steel plate of the above-mentioned multi-layer structure comprises the following steps:

[0021] Continuous casting into billets→soaking in 1# heating furnace→rough rolling in rough rolling unit→heating in 2# heating furnace→high pressure water dephosphorization→finish rolling in finishing rolling unit→cooling in layer cooling device→coiling by coiler;

[0022] Qualified slabs with the above chemical composition are obtained through converter smelting→LF refining→slab continuous casting, wherein the casting speed is 5m / min and the thickness of the slab is 95mm. Uniform heating is carried out in the 1# walking roller ...

Embodiment 2

[0024] A method for producing a low-carbon hot-rolled steel sheet with a multi-layer structure, the chemical composition and mass percentage of the low-carbon hot-rolled steel sheet: C: 0.03%, Si: 0.01%, Mn: 0.15%, P: 0.012 %, S: 0.001%, Als: 0.040%, B≤0.003%, Ti≤0.03%, and the balance is Fe and unavoidable impurities.

[0025] The production method of the low-carbon hot-rolled thin steel plate of the above-mentioned multi-layer structure comprises the following steps:

[0026] Continuous casting into billets→soaking in 1# heating furnace→rough rolling in rough rolling unit→heating in 2# heating furnace→high pressure water dephosphorization→finish rolling in finishing rolling unit→cooling in layer cooling device→coiling by coiler;

[0027] Qualified slabs with the above chemical composition are obtained through converter smelting→LF refining→slab continuous casting, wherein the casting speed is 6m / min and the thickness of the slab is 80mm. Uniform heating is carried out in th...

Embodiment 3

[0029]A method for producing a low-carbon hot-rolled steel sheet with a multi-layer structure, the chemical composition and mass percentage of the low-carbon hot-rolled steel sheet: C: 0.01%, Si: 0.02%, Mn: 0.09%, P: 0.012 %, S: 0.001%, Als: 0.040%, Nb+V+Ti+Cr≤0.10%, the balance is Fe and unavoidable impurities.

[0030] The production method of the low-carbon hot-rolled thin steel plate of the above-mentioned multi-layer structure comprises the following steps:

[0031] Continuous casting into billets→soaking in 1# heating furnace→rough rolling in rough rolling unit→heating in 2# heating furnace→high pressure water dephosphorization→finish rolling in finishing rolling unit→cooling in layer cooling device→coiling by coiler;

[0032] Qualified slabs with the above chemical composition were obtained through converter smelting→LF refining→slab continuous casting, wherein the casting speed was 7m / min and the thickness of the slab was 110mm. Uniform heating is carried out in the 1...

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Abstract

The invention discloses a production method of a low-carbon hot-rolled thin steel plate with a multi-layer organization structure, and belongs to the technical field of metallurgy. The production process of the method comprises the following steps that continuous casting is performed to form a blank; soaking is performed in a No.1 heating furnace; rough rolling is performed by the aid of a rough rolling unit; heating is performed in a No.2 heating furnace; dephosphorization is performed by the aid of high-pressure water; finish rolling is performed by the aid of a finish rolling unit; cooling is performed by the aid of a layer cooling device; and winding is performed by the aid of a winding machine. The low-carbon hot-rolled thin steel plate with the multi-layer organization structure, obtained through the method, is different from a composite steel plate obtained through composite technologies such as explosion, hot rolling and the like and is also different from a homogeneous steel plate obtained through a common hot rolling technology or a common cold rolling technology, and the low-carbon hot-rolled thin steel plate produced through the method is very high in edge ductility, low in edge cracking risk and excellent in performance and can well meet use requirements of downstream users. According to the method, the composite technology of the composite steel plate is omitted, the problems that a gradient material preparation technology is complex, a homogeneous steel plate cracks and the like are solved, and the method has the advantages that procedures are simplified, the carbon emission is reduced, the production efficiency is high, the method is environment-friendly, the cost is low and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for producing a low-carbon hot-rolled thin steel plate with a multi-layer structure. Background technique [0002] Low-carbon hot-rolled thin steel plate has high strength, good plastic toughness, easy processing and good weldability and other excellent properties, mainly used as cold-rolled base material, pickling plate base material, tin / zinc plate base material etc., widely used in ships, automobiles, highway bridges, construction, mechanical equipment, oil pipelines, high-pressure vessels and other industries. At present, the production of low-carbon hot-rolled steel plates mainly adopts rolling in the austenitic zone (finish rolling temperature ≥ A 3 +50℃), a small amount of rolling in the ferrite zone (final rolling temperature <A GP ), so that austenite or ferrite can recrystallize, refine and grow under control, and obtain homogeneous low-carbon hot-rolle...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/00C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/24C22C38/26C22C38/28C22C38/32C21D8/02
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/26C22C38/24C22C38/28C22C38/12C22C38/14C22C38/32C22C38/002C21D8/0205C21D8/0226C21D8/0263C21D2211/005
Inventor 朱国明梁晓慧田鹏康永林
Owner UNIV OF SCI & TECH BEIJING
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