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

苏春霞; 陈本文; 付超; 孙殿东; 王勇

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

更新时间：2026-01-21

- An Analysis on Crane- Conveying Fracture of Partial 170 mm Casting Slab of Steel 25SiMn2 and Improving Measures
- Special Steel Vol. 35, Issue 4, Pages: 34-35(2014)
- 作者机构：
  
  鞍钢股份有限公司技术中心，鞍山9,H400
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：18 February 2014，
  
  Online First：03 September 2022，
  
  Published：03 September 2014
- 稿件说明：
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苏春霞, 陈本文, 付超, et al. 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.
DOI：

苏春霞, 陈本文, 付超, et al. 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. DOI：

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.

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