25SiMn2钢部分170 mm连铸板坯吊运断裂原因分析和改进措施

特殊钢 ›› 2014, Vol. 35 ›› Issue (4): 34-35.

25SiMn2钢部分170 mm连铸板坯吊运断裂原因分析和改进措施

苏春霞, 陈本文, 付超, 孙殿东 ,王勇

鞍钢股份有限公司技术中心，鞍山H4009

收稿日期:2014-02-18 出版日期:2014-08-01 发布日期:2022-09-03
作者简介:苏春霞( 1978-),女，硕士(东北大学)，高级工程师,2000年沈阳工业大学(本科)毕业，高强度钢开发。

An Analysis on Crane- Conveying Fracture of Partial 170 mm Casting Slab of Steel 25SiMn2 and Improving Measures

Su Chunxia, Chen Benwen, Fu Chao, Sun Diandong ,Wang Yong

Technology Center, Angang Corp Ltd, Anshan 114009

Received:2014-02-18 Published:2014-08-01 Online:2022-09-03

摘要/Abstract

摘要： 分析了在吊运过程部分25SiMn2钢重22 t170 mm×1 650 mm×10 000 mm连铸板坯断裂的原因。结果表明,浇铸时中间包钢水过热度高(30~36℃),引起铸坯厚度1/4位置柱状晶发达,钢液凝固时流动性不好,补缩不足,出现大量显微缩孔,并在反复吊运后在自身重力作用下,显微缩孔处应力集中开裂而造成铸坯断裂。通过降低中间包钢水过热度(10~30℃) 、减少吊运次数可有效避免铸坯断裂。

Abstract: The cause for fracture of partial 22 t 170 mm x 1 650 mm x 10 000 mm casting slab of steel 25SiMn2 during crane-conveying process has been examined and analyzed. Results show that during casting the superheating extent of liquid steel in tundish is higher (30 ~36 °C) led to significant columnar crystal growth at 1/4 thickness of slab, poor fluidity of molten steel and lack back feeding during solidification, as result a lot of micro-shrinkage cavity occur causing crack at micro-shrinkage cavity by stress concentration effect and finally causing fracture of slab by repeating crane-conveying and acting with self-gravity. The fracture of casting slab is availably avoided by decreasing superheating extent of liquid in tundish to 10 ~30 ℃ and reducing times of crane-conveying of slab.

苏春霞, 陈本文, 付超, 孙殿东, 王勇. 25SiMn2钢部分170 mm连铸板坯吊运断裂原因分析和改进措施[J]. 特殊钢, 2014, 35(4): 34-35.

Su Chunxia, Chen Benwen, Fu Chao, Sun Diandong , Wang Yong. An Analysis on Crane- Conveying Fracture of Partial 170 mm Casting Slab of Steel 25SiMn2 and Improving Measures[J]. Special Steel, 2014, 35(4): 34-35.