A Continuous Casting Process of High Straightening Strain C-Class Angle Steel

A continuous casting process and angle steel technology, which is applied in the field of large straightening strain C grade angle steel continuous casting process, can solve problems such as corner cracking, achieve the effects of reducing the generation of transverse cracks, preventing bonding, and promoting heat transfer effects

Active Publication Date: 2019-02-01
CENT IRON & STEEL RES INST
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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a large straightening strain C-grade angle steel continuous casting process, in order to solve the problem that cracks are easily formed at the corners during the existing large angle steel rolling process

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  • A Continuous Casting Process of High Straightening Strain C-Class Angle Steel
  • A Continuous Casting Process of High Straightening Strain C-Class Angle Steel
  • A Continuous Casting Process of High Straightening Strain C-Class Angle Steel

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Embodiment Construction

[0058] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principle of the present invention.

[0059] A large straightening strain C grade angle steel continuous casting process, the composition and mass percentages of molten steel used in the large straightening strain C grade angle steel continuous casting process are: C: 0.16-0.19%, Mn: 1.38-1.45%, Si: 0.25~0.35%, S, P≤0.030%, V: 0.06~0.09%, N: 0.006~0.010%, Al: 0.017~0.022%, Ti: 0.02~0.04%;

[0060] The continuous casting process of large straightening strain C grade angle steel includes the following steps:

[0061] S1, converter smelting process;

[0062] S2, ladle refining furnace refining process;

[0063] S3, continuous casting process;

[0064] S4, heating and rolling process;

[00...

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Abstract

The invention relates to a continuous casting technology for C-grade angle steel with large straightening strain and belongs to the technical field of steelmaking and continuous casting. Mainly based on new measures provided for the aspects of liquid steel composition, operating parameters of a continuous casting machine, cooling conditions of a secondary cooling zone, vibration parameters of a crystallizer and casting powder ingredients, a casting blank still can stably produce a qualified product when large straightening is carried out. The continuous casting technology mainly comprises the following steps: adding 0.02-0.04% of titanium into molten steel, mounting arrangement of a nozzle in a secondary cooling zone can guarantee that all the sides of the casting blank can be uniformly cooled, the crystallizer, a foot roller section and the secondary cooling zone adopt a low cooling system, so that no dark corner is produced at a corner of a straightening segment casting blank, vibration frequency of the crystallizer is designed to be 140-160 times / min, and the casting powder specially used for low-alkalinity CaO-SiO2 slag system high-aluminum steel is adopted. By adopting the comprehensive technological method, qualified rate of the casting blank is 100%, and qualified rate of rolled steel reaches 95%.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, steelmaking and continuous casting, in particular to a continuous casting process for C-grade angle steel with large straightening strain. Background technique [0002] In recent years, steels with higher strength such as Q420 have been widely used and researched in UHV power transmission projects. The steels such as Q235 and Q345 used in the past can no longer meet the requirements of large-scale and high-load power towers. According to It is reported that the use of Q420 grade angle steel instead of Q345 grade steel angle steel can reduce the steel consumption by about 20% on average. According to the requirements of the national standard GB / T1591-2008 for low-alloy high-strength structural steel, for Q420C steel, the composition requires Al ≥ 0.015%, and the performance (thickness ≤ 16mm specifications), requires yield strength ≥ 420MPa, tensile strength 520 ~ 680MPa, sectio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/06C22C38/14C22C33/06C21C7/06B22D11/111B22D11/18
CPCB22D11/111B22D11/18C21C7/0006C21C7/06C22C33/06C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 汪成义崔怀周王彦生赵斌肖金福林腾昌
Owner CENT IRON & STEEL RES INST
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