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A kind of production method of low-carbon hot-rolled thin steel sheet with multi-layer structure

A hot-rolled thin steel plate and microstructure technology, applied in the field of metallurgy, can solve problems such as high cost, poor edge ductility of homogeneous steel plate, complex production process of composite plate or gradient material, etc.

Active Publication Date: 2022-07-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • 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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  • A kind of production method of low-carbon hot-rolled thin steel sheet with multi-layer structure
  • A kind of production method of low-carbon hot-rolled thin steel sheet with multi-layer structure
  • A kind of production method of low-carbon hot-rolled thin steel sheet with multi-layer structure

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Embodiment 1

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

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

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

[0022] Through converter smelting→LF refining→slab continuous casting, qualified slabs with the above chemical composition are obtained, wherein the pulling speed is 5m / min, and the slab thickness is 95mm. Uniform heating was carried out i...

Embodiment 2

[0024] A method for producing a low-carbon hot-rolled steel sheet with a multi-layered structure, the chemical composition and mass percentage of the low-carbon hot-rolled steel sheet are: 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 inevitable impurities.

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

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

[0027] The qualified slab with the above chemical composition is obtained by converter smelting→LF refining→slab continuous casting, wherein the pulling speed is 6m / min and the slab thickness is 80mm. Uniform heating was carrie...

Embodiment 3

[0029]A method for producing a low-carbon hot-rolled steel sheet with a multi-layered structure. The chemical composition and mass percentage of the low-carbon hot-rolled steel sheet are: 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 inevitable impurities.

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

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

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

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Abstract

A method for producing a low-carbon hot-rolled thin steel plate with a multi-layered structure belongs to the technical field of metallurgy. The production process of the method is as follows: continuous casting into billets → soaking in the 1# heating furnace → rough rolling in the rough rolling group → heating in the 2# heating furnace → high-pressure water dephosphorization → finishing rolling in the finishing rolling group → cooling by the layer cooling device → coiling machine coil Pick. The low-carbon hot-rolled thin steel sheet with multi-layered structure obtained by this method is different from the composite steel plate obtained by the composite process such as explosion or hot rolling, and also different from the homogeneous steel plate obtained by the ordinary hot rolling process or cold rolling process. The low-carbon hot-rolled thin steel sheet produced by this method has very high edge ductility, low risk of edge cracking, and excellent performance, which can well meet the needs of downstream users. The method omits the cladding process of the clad steel plate, avoids the complex preparation process of the gradient material and the cracking of the homogeneous steel plate, and has the advantages of simplifying the process, reducing carbon emissions, high production efficiency, green environmental protection and low cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates 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 sheet steel has excellent properties such as high strength, good plasticity and toughness, easy processing and good weldability, etc. It is widely used in ships, automobiles, highways and bridges, construction, machinery and equipment, oil pipelines, high-pressure containers and other industries. At present, the production of low-carbon hot-rolled steel plate mainly adopts austenite zone rolling (finish rolling temperature ≥ A 3 +50℃), a small amount of rolling in the ferritic zone (finish rolling temperature <A GP ), make austenite or ferrite recrystallize, refine and control growth, and obtain a homogeneous low-carbon hot-rolled steel sheet with uniform grains and a single structure. It is strictly forbidden to rol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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