High-toughness boron-containing carbon structural steel sheet coil and production method thereof

A technology of structural steel plate and production method, which is applied in the field of carbon structural steel and low alloy steel, can solve problems such as insufficient elongation and strength performance, tensile fracture delamination, impact fracture delamination, etc., to avoid insufficient elongation performance, microstructure Uniform, good low temperature impact toughness effect

Active Publication Date: 2016-12-07
MAGANG (GROUP) HOLDING CO LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ubiquitous problem is that in the thickness range of 20-25.4mm, the problem of insufficient elongation and strength performance is likely to occur, which cannot fully meet the requirements of GB / T700; for other thickness specification plates or coils, the problem is that the microstructure of the plate is 'iron'. Element body + a small amount of pearlite' appears in a banded distribution, which is prone to tensile fracture delamination and impact fracture delamination, as well as anisotropy of material properties

Method used

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  • High-toughness boron-containing carbon structural steel sheet coil and production method thereof
  • High-toughness boron-containing carbon structural steel sheet coil and production method thereof
  • High-toughness boron-containing carbon structural steel sheet coil and production method thereof

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Embodiment Construction

[0027] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0028] The chemical composition design, rolling process and cooling process used in this embodiment are applied to carbon structural steel and low alloy steel with a yield strength of 200-420 MPa in the current GB700, JIS G3101, JIS G3109 and other standard specifications, which can significantly improve the structure and Uniformity of properties, improved levels of toughness and ductility.

[0029] To this end, the main points of the plan are: first, the carbon content is less than 0.30%, and an ultra-low carbon design of less than 0.06% can be adopted, or a carbon content higher than 0.06% can be adopted without ultra-low carbon design, up to a maximum of 0.30%. Design, can still obtain a uniform microstructure, to avoid banded structure and tensile fracture, impact fracture delaminati...

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Abstract

The invention relates to a high-toughness boron-containing carbon structural steel sheet coil and a production method thereof, which contain carbon ≤ 0.30%, silicon: ≤ 0.50%, manganese: ≤ 1.70%, phosphorus: ≤ 0.035%, sulfur: ≤ 0.035% by weight , Aluminum: 0.015-0.050%, and 8-50ppm of boron, and the balance is iron and trace impurities. Through boron microalloying and microstructure homogenization, the elongation performance, room temperature and low temperature impact toughness of existing carbon structural steels and low alloy steels with a yield strength of 215-345 MPa represented by Q235 and SS400 are improved.

Description

technical field [0001] The invention relates to carbon structural steel and low-alloy steel, in particular to a high-toughness boron-containing carbon structural steel coil and a production method thereof. Background technique [0002] At present, the Q235 carbon structural steel plate coils produced by various steel mills adopt the general carbon and manganese composition design. The ubiquitous problem is that in the thickness range of 20-25.4mm, the problem of insufficient elongation and strength performance is easy to occur, which cannot fully meet the requirements of GB / T700; for other thickness specification plates or coils, the problem is that the microstructure of the plate is 'iron'. The matrix + a small amount of pearlite' appears in a banded distribution, which is easy to produce tensile fracture delamination and impact fracture delamination, as well as anisotropy of material properties. Contents of the invention [0003] The purpose of the present invention is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C21D8/02
Inventor 李忠义朱涛赵勇
Owner MAGANG (GROUP) HOLDING CO LTD
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