Analysis on Hot Heading Crack of Non-Quenched and Tempered Steel F45MnVS and Improved Measures of Process

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Analysis on Hot Heading Crack of Non-Quenched and Tempered Steel F45MnVS and Improved Measures of Process

更新时间：2026-01-21

- Analysis on Hot Heading Crack of Non-Quenched and Tempered Steel F45MnVS and Improved Measures of Process
- Special Steel Vol. 36, Issue 5, Pages: 24-26(2015)
- 作者机构：
  
  山东钢铁股份有限公司莱芜分公司,莱芜,271104
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：10 April 2015，
  
  Online First：15 August 2022，
  
  Published：15 August 2015
- 稿件说明：
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李泰. Analysis on Hot Heading Crack of Non-Quenched and Tempered Steel F45MnVS and Improved Measures of Process[J]. Special Steel, 2015, 36(5): 24-26.
DOI：

李泰. Analysis on Hot Heading Crack of Non-Quenched and Tempered Steel F45MnVS and Improved Measures of Process[J]. Special Steel, 2015, 36(5): 24-26. DOI：

摘要

非调质钢F45MnVS的生产流程为50 t UHP EAF-LF-VD-260 mm×300 mm

180 mm×220 mm坯连铸-Φ20~Φ160 mm材轧制。根据显微组织分析

热顶锻裂纹由块状和片状MnS和附着的Al

-MnO-FeO复合氧化物引起

通过控制钢中Al 0.010%~0.030%

电弧炉终点[C

]

≥0.20%

终点[P

]

≤0.025%

[Mn

]

/[S

]

＞20

LF精炼渣碱度≥3.0

VD后软吹氩时间≥12 min

保证钢中硫分布均匀;中间包钢水过热度20~30℃

控制连铸拉速防止MnS偏析;控制终轧温度850~1000℃

轧后冷速2~4℃/s等工艺措施

使钢中夹杂物主要为长条状MnS

热顶锻试验无裂纹和其他缺陷

全部合格。

Abstract

The production flowsheet for non-quenched and tempered steel F45MnVS is 50 t UHP EAF-LF-VD-260 mm x300 mm and 180 mm x 220 mm billet casting-rolling to Φ20-Φ160 mm products. According to analysis on microstructure of steel

the hot heading crack is caused by block and lamella MnS and attached with Al

-MnO-FeO compound oxide. With using the process measures including controlling Al content in steel 0.010%-0.030%

EAF end [C

]

≥0.20% and end [P

]

≤0.025%

[Mn

]

/[S

]

＞20

LF refining slag basicity ≥3.0

after VD soft argon blowing for ≥ 12 min

ensuring homogeneous distribution of sulfur in steel

superheating extent of liquid in tundish 20-30 °C

controlling casting speed to prevent MnS segregation

and controlling finishing rolling temperature 850-1000 °C and cooling rate after rolling 2

-4℃/s

the main inclusions in steel is long lath MnS

the hot heading test is all qualified without crack and other defects.

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