ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2022, Vol. 43 ›› Issue (5): 39-42.

• 工艺技术 • 上一篇    下一篇

10B21含硼冷镦钢轧后结疤成因分析及工艺改进

肖广阔1 ,韩鹏龙2 ,孙晓林3 ,高春群2 ,刘志国2   

  1. 1. 邯郸钢铁集团有限责任公司冷轧厂,邯郸 056015 ;
    2. 邯郸钢铁集团有限责任公司一炼钢厂,邯郸 056015 ;
    3. 河北工程大学材料科学与工程学院,邯郸 056038 ;
  • 收稿日期:2022-02-07 出版日期:2022-10-01 发布日期:2022-09-28
  • 通讯作者: 韩鹏龙
  • 作者简介:肖广阔(1998-),男,助理工程师

Forming Reason and Process Improvement of Seab Defects Rolled Boron-bearing Cold Heading Steel 10B21

Xiao Guangkuo1 , Han Penglong2 , Sun Xiaolin3 , Gao Chunqun2 , Liu Zhiguo2   

  1. 1. Cold rolling plant, Handan Iron and Steel Group Company Limited. Handan 056015 ;
    2. Frist Steelmaking Plant, Handan Iron and Steel Group Company Limited. Handan 056015 ;
    3. College of Materials Science and Engineering, Hebei University of Engineering, Handan 056038 ;
  • Received:2022-02-07 Published:2022-10-01 Online:2022-09-28
  • Contact: Han Penglong

摘要: 通过实验及热力学分析得出,轧制10B21钢结疤形成主要原因为钢中平均N含量为127×10-6,导致铸坯角部冷却过程中在奥氏体晶界析出细小的BN和AlN夹杂,增加了铸坯的裂纹敏感性,形成铸坯裂纹。通过提高铁水比≥920 kg/t、转炉终点C-T-P(碳-温度-磷)命中率≥85%、出钢口圆流出钢以及LF加热次数≤3次,时间≤25 min等措施可将钢中的氮含量稳定控制在≤50×10-6,有效避免10B21钢轧后盘条结疤,提高成材率,降低成本。

关键词: 冷傲钢10B21 , 盘条, 轧后结疤, BN, AIN

Abstract: Through experiments and thermodynamic analysis, it is obtained that the main cause of the scab forming of rolled 10B21 steel is the average nitrogen content in steel being 127 x 10-6 , lead to the precipitation of fine BN and AIN inclusions at the austenite grain boundary at the comer of cast billet during cooling, increasing the crack sensitivity of the billet and forming the billet crack, the nitrogen content in steel can be stably controlled below 50 x 10-6 by increasing the consumption of molten iron ≥ 920 kg/t, increasing the C-T-P ( Carbon-Temperature-Phosphorus) hit rate ≥ 85% at the end of die converter, discharging steel from the outlet round, healing number of times of LF ≤ 3 time, and ≤ 25 minutes casting. It can effectively prevent wire rod scarring of 10B21 steel after rolling to improve the yield of rolled steel and to reduce the production cost.

Key words: Cold Heading Steel 10B21, Coil, Rolled Scarring, BN, AIN