Q355BS热轧钢板开裂成因分析

Cause Analysis of Cracking of Q355BS Hot Rolled Steel Plate

热轧钢板出现穿透上下表面的裂纹,在生产中属于严重的质量事故。文章通过宏观观察、金相高倍检验、电镜能谱分析,分析了热轧钢板表面出现穿透性开裂的主要原因。结果表明:钢板表面存在硫化物夹杂聚集以及连铸坯表面存在裂纹是造成钢板穿透性开裂的主要原因。

Cracks penetrating the upper and lower surfaces of hot rolled steel plates are serious quality accidents in production.Through macroscopic observation,metallographic high-power examination and electron microscope energy spectrum analysis,the main causes of penetration cracking on the surface of hot-rolled steel plate were analyzed.The results show that the sulfide inclusions on the surface of the steel plate and the cracks on the surface of the continuous casting slab are the main reasons for the penetration cracking of the steel plate.