Practice of Steel 18CrNiMo7-6 Bloom by Process of 120 t BOF-LF-RH-410 mm x 530 mm Continuous Casting

李博鹏; 王占忠; 柳萍; 张光鸿; 郑文超; 饶金元; 王川

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Practice of Steel 18CrNiMo7-6 Bloom by Process of 120 t BOF-LF-RH-410 mm x 530 mm Continuous Casting

更新时间：2026-01-21

- Practice of Steel 18CrNiMo7-6 Bloom by Process of 120 t BOF-LF-RH-410 mm x 530 mm Continuous Casting
- Special Steel Vol. 40, Issue 3, Pages: 32-34(2019)
- 作者机构：
  
  1. 大冶特殊钢股份有限公司技术中心,黄石,435001
  2. 高品质特殊钢湖北省重点实验室,黄石,435001
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：23 November 2018，
  
  Online First：16 May 2022，
  
  Published：16 May 2019
- 稿件说明：
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李博鹏, 王占忠, 柳萍, et al. Practice of Steel 18CrNiMo7-6 Bloom by Process of 120 t BOF-LF-RH-410 mm x 530 mm Continuous Casting[J]. Special Steel, 2019, 40(3): 32-34.
DOI：

李博鹏, 王占忠, 柳萍, et al. Practice of Steel 18CrNiMo7-6 Bloom by Process of 120 t BOF-LF-RH-410 mm x 530 mm Continuous Casting[J]. Special Steel, 2019, 40(3): 32-34. DOI：

摘要

采用铁水+废钢-120 t转炉-LF-RH-410 mm×530 mm大方坯连铸-步进式加热炉-750轧机轧制-退火的流程生产规格Φ115～250 mm 18CrNiMo7-6（/%:0.15～0.19C

0.25～0.40Si

0.40～0.60Mn

1.50～1.80Cr

1.40～1.70Ni

0.25～0.35Mo

≤0.020P

≤0.020S

0.020～0.040Al

0.0100-0.0200N）。通过控制出钢预脱氧和合金化

深真空时间≥15 min

软吹氮气

控制中间包钢水过热度

拉速0.48 m/min

全过程Ar气保护

连铸M-EMS和F-EMS

轧制后退火等工艺措施

生产的产品宏观夹杂物检测含量≤20mm/dm

碳中心偏析指数≤1.10

晶粒度≥7级

钢材各项指标满足协议要求。

Abstract

The steel grade 18CrNiMo7-6 with diameter of Φ115 ~250 nun round from process route of hot metal + scrap-120 t BOF-RH- 410 mm x530 mm continuous casting-bloom heating by walking forward heating fumace-750 rolling¬annealing. Its chemical composition is (/% : 0. 15 ~ 0. 19C

0. 25 ~ 0. 40Si

0. 40 ~ 0. 60Mn

1.50 ~ 1. 80Cr

1.40 ~ 1.70Ni

0.25 ~0. 35Mo

W0. 020P

W0. 020S

0.020 ~ 0. 040Al

0.0100 ~ 0.0200N). Through deoxidization and alloy addition during tapping

deep vacuum degassing not less than 15 minutes

soft bubbling with Nitrogen

super heat control in tundish

casting speed of 0. 48 m/min

full process argon protection and applications of F-EMS and M-EMS

annealing after rolling etc.

the final product

s macro-inclusion not more than 20 mm/dm

carbon center segregation not more than 1. 10 and grain size finer than 7

which meet the specification requirements.

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