Process Practice of Sulfide Controlling for Free Cutting Steel C38N2 Bearing Sulfur for Auto Crankshaft

郑文超; 夏旺苟; 何浪; 陈国生; 张念

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Process Practice of Sulfide Controlling for Free Cutting Steel C38N2 Bearing Sulfur for Auto Crankshaft

更新时间：2026-01-21

- Process Practice of Sulfide Controlling for Free Cutting Steel C38N2 Bearing Sulfur for Auto Crankshaft
- Special Steel Vol. 40, Issue 1, Pages: 43-46(2019)
- 作者机构：
  
  1. 湖北新冶钢有限公司1棒材研究所
  2. 炼钢事业部,黄石,435001
  3. 大冶特殊钢股份有限公司高品质特殊钢湖北重点实验室,黄石,435001
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：12 August 2018，
  
  Online First：24 May 2022，
  
  Published：24 May 2019
- 稿件说明：
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郑文超, 夏旺苟, 何浪, et al. Process Practice of Sulfide Controlling for Free Cutting Steel C38N2 Bearing Sulfur for Auto Crankshaft[J]. Special Steel, 2019, 40(1): 43-46.
DOI：

郑文超, 夏旺苟, 何浪, et al. Process Practice of Sulfide Controlling for Free Cutting Steel C38N2 Bearing Sulfur for Auto Crankshaft[J]. Special Steel, 2019, 40(1): 43-46. DOI：

摘要

C38N2钢(/%:0. 36～0.40C

0. 50～0.65Si

1. 40～1. 55Mn

≤0. 025P

0. 010～0.040S

0.10～0.25Cr

≤0.01Al

0. 015～0.020N)的生产工艺流程为120 t BOF-LF-RH-410 mm×530 mm连铸坯-连轧成Φ170 mm材。统计分析了精炼渣碱度(2. 0～5. 5)、成品钢中Ca含量(0～0. 075%)、中间包覆盖剂碱度(5. 94和1.70)、二冷水(0. 14～0. 24 L/kg)和结晶器搅拌电流(250 A和100 A)对钢中硫化物的影响

通过采用2～3低碱度精炼渣

控制[Ca]/[S]>0.03

使用1.70碱度中间包覆盖剂

二冷水0.24 L/kg

结晶器搅拌电流100 A等工艺措施

使钢中A类细系硫化物≤2.5级的比率从工艺改进前80%提高至95%

钢中小尺寸、弥散分布的球形或纺锤形硫化物明显增多。

Abstract

The production process flowsheet of steel C38N2 (/% : 0. 36 〜0.40C

0. 50 ~0. 65Si

1.40 ~ 1. 55Mn

≤ 0.025P

0.010 ~0.040S

0. 10 ~0

25Cr

≤ 0.01A1

0.015 ~0.020N) is 120 t-BOF-LF-RH-410 mm x 530 mm bloom casting-continuous rolling to Φ170 mm products. The statistics of effect of refining slag basicity (2. 0 ~ 2. 5 )

Ca content in finished steel (0 ~ 0.075%)

tundish shielding agent basicity (5. 94 and 1.70)

secondary cooling water (0. 14 ~0. 24 L/kg) and mould electromagnetic stirring current (250 A and 100 A) on sulfide in steel has been analyzed. With process measures including using 2 ~3 low basicity slag .in refining

controlling [ Ca]/[ S]>0. 03

using tundish shielding agent basicity 1. 70

secondary cooling water rate 0. 24 L/kg and mould electromagnetic stirring current 100 A

the ratio of rating ≤2. 5 of A-thin series sulfide in steel increases from 80% before process improvement to 95%

and the fine

dispersed distributed spheroidal and spindle-shaped sulfide in steel increases markedly.

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