摘要
为提高异形坯的质量和产品合格率,对异形坯的各种缺陷形成因素进行了综合分析。异形坯的表面缺陷主要是钢液在结晶器内凝固成坯壳的过程中产生的,主要有表面纵裂、角部纵裂、表面横裂、星形裂纹、表面夹渣、气孔和凹坑。内部缺陷主要与钢水中硫、磷含量过高、二次冷却水分配不合理、支撑系统没严格对中、铸坯表面温度回升有关,主要有中心裂纹、矫直裂纹、中心偏析、中心疏松和三角区裂纹。形状缺陷主要与内外弧冷却不均匀有关,主要表现为翼缘平行度差。针对异形坯的各种质量缺陷,提出了相应的预防措施。
In order to improve the beam blank quality and the qualification rate of the products all factors causing formation of the defects of the beam blank have been analyzed comprehensively. The surface defects of the beam blank occur essentially in the process of shell solidification in the mould and the defects mainly involve surface longitudinal cracks, longitudinal corner cracks, transversal surface cracks, star cracks, inclusions on the surface, blow holes and concave pit. The inner defects mainly including central cracks, straightening cracks, segregations, center porosity and triangular zone cracks are closely related to over high S ＆ P content in the hot metal, unreasonable distribution of the secondary cooling water, misalignment of the support system and surface temperature rise of the beam blank. The shape defects of which the main representation is deviation of flange parallelism, arise principally from inhomogeneous cooling on the inner and outer bow. In light of the above mentioned defects of the beam blank preventive measures are accordingly put forward.
出处
《炼钢》
CAS
北大核心
2013年第1期74-78,共5页
Steelmaking
关键词
异形坯
表面缺陷
内部缺陷
形状缺陷
裂纹
偏析
beam blank
surface defect
inner defect
shape defect
crack
segregation
