氮含量对10B21冷镦钢Φ12 mm线材淬火硬度的影响

特殊钢 ›› 2016, Vol. 37 ›› Issue (5): 48-50.

氮含量对10B21冷镦钢Φ12 mm线材淬火硬度的影响

李永超^1,2，阮士朋^1,2，郭明仪^1,2

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；

收稿日期:2016-04-18 出版日期:2016-10-01 发布日期:2022-08-05
作者简介:李永超(1985-)，男，硕士(2012年北京科技大学)，工程师，2009年河北理工大学(本科)毕业，中低碳的开发和工艺控制。

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

Li Yongchao^1,2 , Ruan Shipeng^1,2 , Guo Mingyi^1,2

1. Xingtai Iron and Steel Co Ltd, Xingtai 054027 ；
2. Hebei Province Engineering Research Center for Wire Rod, Xingtai 054027;

Received:2016-04-18 Published:2016-10-01 Online:2022-08-05

摘要/Abstract

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。

关键词: 10B21冷镦钢, 淬火硬度, 氮含量

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.

Key words: Cold Heading Steel 10B21, Quenched Hardness, Nitrogen Content

李永超, 阮士朋, 郭明仪. 氮含量对10B21冷镦钢Φ12 mm线材淬火硬度的影响[J]. 特殊钢, 2016, 37(5): 48-50.

Li Yongchao , Ruan Shipeng , Guo Mingyi. 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.

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