Analysis on Affecting Factors of Slab Surface Transversal Corner Crack for Medium-Carbon Steel with Boron in Continuous Casting

Abstract:

Based on the production practice of boron microalloyed medium-carbon steel, oscillating curve, cooling water flow in mould, secondary cooling system and arc alignment precision, rolling gap precision on transversal corner crack in slab was analyzed, and the corresponding control measures were put forward. Such as: Stabilizing the [S] and making w(S） less than 0.015%; Increasing Mn/S, and making the Mn/S was not less than 37.6 in A36-LB; Strictly controlling the w(Ca)/w(Als) was more than 0.09. Decreasing stroke 1mm and improving frequency to reduce negative sliding time 32%; Stabilizing cooling water around 4000/380 L/min, less cooling, reduce the total water cold water and 50% Side water; Testing rolling gap termly, strengthening maintenance and Replacing bad roller column to make sure precision in the reasonable scope, the measures above suppressed the corner crack in slab effectively, and it’s degradation ratio and quality disputes were below that of Q235B in the mouth production level.

• Periodical: Applied Mechanics and Materials (Volumes 275-277)
• Pages: 1890-1895
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.275-277.1890
• Online since: January 2013
• Authors: Qi Chun Peng, Zhi Bo Tong, Dan Ping Fan
• Keywords: Boron Microalloyed, Medium-Carbon Steel, Quality, Transversal Corner Crack

References

[1] Zhang Lintao, Deng Anyuan, Wang Engang. Formation and influencing factors of oscillation marks for continuous casting steel billet[J]. Steelmaking, 2006, (8): 37.

[2] Chen Yong, Yang Subo, Zhu Miaoyong. Control of Transverse Corner Cracks on Continuous Casting Slab for HSLA of Panzhihua Steel[J]. Iron steel Vanadium Titanium, 2008, 29(3): 55~62.

[3] Jiao Guohua. Reason and Control of Edge Cracking of CSP Hot-Rolled Strip[J]. Iron & Steel, 2006, 46(6): 28～31.