Analysis on Forming Mechanism of Inner Cross Crack in Concasting Thin Slab Produced by FTSR Process

冯运莉; 王庆双; 谢启川

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Analysis on Forming Mechanism of Inner Cross Crack in Concasting Thin Slab Produced by FTSR Process

更新时间：2026-01-21

- Analysis on Forming Mechanism of Inner Cross Crack in Concasting Thin Slab Produced by FTSR Process
- Special Steel Vol. 28, Issue 3, Pages: 22-24(2007)
- 作者机构：
  
  河北理工大学金属材料工程系,唐山,063009
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：06 December 2006，
  
  Online First：31 January 2023，
  
  Published：31 January 2007
- 稿件说明：
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冯运莉, 王庆双, 谢启川. Analysis on Forming Mechanism of Inner Cross Crack in Concasting Thin Slab Produced by FTSR Process[J]. Special Steel, 2007, 28(3): 22-24.
DOI：

冯运莉, 王庆双, 谢启川. Analysis on Forming Mechanism of Inner Cross Crack in Concasting Thin Slab Produced by FTSR Process[J]. Special Steel, 2007, 28(3): 22-24. DOI：

摘要

采用Gleeble-3500热模拟机模拟FTSR薄板坯生产工艺

试验了SS330钢板坯(0.06％C)和SS400钢板坯(0.20％C)在600～1 350℃的高温塑性。结果表明

SS400钢在700～900℃的高温塑性高于SS330钢

SS400钢板坯内部产生的横向裂纹是由于柱状晶晶界处硫、氧化物的偏聚

使钢晶界的高温塑性下降所致。通过钢中硫含量由0.015％降低至0.010％

全氧含量由45×10

-6

降至30×10

-6

钢中Nn／S≥60

钢水过热度由30～50℃降至20～35℃

铸坯拉速由2.5～6.0 m／min改为3.0～4.5 m／min

控制二冷水量

有效地避免了薄板坯内部横裂纹的产生。

Abstract

The process of thin slab produced by FTSR(Flexible Thin Slab Rolling)process has been simulated by Gleeble-3500 thermal simulation machine

and the high temperature plasticities of slab of steel SS330(0.06%C)and steel SS400(0.20%C)600～1350 ℃ were tested

Results showed that the high temperature plasticity of steel SS400 at 700~ 900 ℃ was high than that of steel SS330;the high temperature plasticity decreasing of steel SS400 due to segregation and accumulation of sulphide and oxide at boundary of columnar crystal caused inner cross crack formation in slab. With con trolling sulphur content in steel decreasing to 0.010% from 0.015%

total oxygen content to 30×10

-6

from 45×10

-6

superheating degree of molten steel to 20~35℃ from 30~50℃

Mn/S in steel ≥60 a

nd modifying slab casting speed to 3.0~4.5 m/min from original 2.5~6.0 m/min with reasonably controlling secondary cooling water amount

the thin slab inner cross crack was avoided effectively.

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