Effect of Nitrogen Content on Quenched Hardness of Φ12 mm Rod Products of Cold Heading Steel 10B21

李永超; 阮士朋; 郭明仪

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Effect of Nitrogen Content on Quenched Hardness of Φ12 mm Rod Products of Cold Heading Steel 10B21

更新时间：2026-01-21

- Effect of Nitrogen Content on Quenched Hardness of Φ12 mm Rod Products of Cold Heading Steel 10B21
- Special Steel Vol. 37, Issue 5, Pages: 48-50(2016)
- 作者机构：
  
  1. 邢台钢铁有限责任公司,邢台,054027
  2. 河北省线材工程技术研究中心,邢台,054027
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：18 April 2016，
  
  Online First：05 August 2022，
  
  Published：05 August 2016
- 稿件说明：
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李永超, 阮士朋, 郭明仪. Effect of Nitrogen Content on Quenched Hardness of Φ12 mm Rod Products of Cold Heading Steel 10B21[J]. Special Steel, 2016, 37(5): 48-50.
DOI：

李永超, 阮士朋, 郭明仪. Effect of Nitrogen Content on Quenched Hardness of Φ12 mm Rod Products of Cold Heading Steel 10B21[J]. Special Steel, 2016, 37(5): 48-50. DOI：

摘要

10B21冷镦钢（/%:0.18~0.23C

≤0.10Si

0.60~0.90Mn

≤0.030P

≤0.035S

0.0008~0.0030B

≥0.02A1）的生产流程为50t顶底复吹转炉-LF-280 mm×325 mm连铸坯-连轧成Φ12 mm材。通过检测得出

当钢中氮含量为0.0046%时

该钢淬火后的HRC硬度值为41~43

而当钢中氮含量为0.0081%时

其淬火后HRC硬度值为21~27

小于技术条件要求HRC值38。通过试验得出Ti/N≤8时

随Ti/N增加

钢中硼的收得率显著增加

如钢中氮含量0.0046%时

Ti/N为7.4

硼收得率达90%

钢中氮含量0.0081%时

Ti/N为4.3

硼的收得率不到70%

造成钢中B含量低

淬火后HRC值降低。通过改进BOF和LF操作

使钢中氮含量控制在0.005%以下（0.0039%~0.0041%）

Ti/N为7.5~8.1

钢材心部淬火HRC值为40~42

达到用户要求。

Abstract

The production flowsheet for cold heading steel 10B21 (/% ：0.18-0.23C

≤0.10Si

0.60-0.90Mn

≤0.030P

≤0.035S

0.0008-0.0030B

≥0.02Al) is 50t top and bottom combined blowing converter-LF-280 mm x 325 mm casting bloom-continuous rolling to Φ12 mm rod products. It is obtained by examination that as nitrogen content in steel is 0.0046%

the HRC hardness value of quenched steel is 41-43

while as the nitrogen content in steel is 0.0081%

the HRC value of quenched steel is 21-27 that is less than the specification requirement HRC value 38. And it is obtained by test that as Ti/N ≤8

with increasing Ti/N the yield of boron in steel increases obviously

for instance on condition that the nitrogen content in steel is 0.0046% with Ti/N being 7. 4

the yield of boron is up to 90%

and on this condition the nitrogen in steel is 0.0081% with Ti/N being 4.3

the yield of boron in steel is less than 70% led to low boron content in steel and lower HRC value of quenched steel. By improving the BOF and LF operation to control the nitrogen in steel less than 0.005% (0.0039%-0.0041% ) with Ti/N being 7.5-8.1

the quenched HRC value of core of rod product is 40-42 to meet the requirement of user.

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