ISSN：1003-8620

CN：42-1243/TF

Governed by: CITIC Pacific Special Steel Group Co., LTD

Sponsored by: Daye Special Steel Co., LTD.

Special Steel ›› 2008, Vol. 29 ›› Issue (1): 37-39.

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Effect of Breakdown Process on Surface Cracking of Billet of Free Cutting Austenite Stainless Steel

Li  Zhuang1,2,  Wu  Di1, Qi  Ruigui3   

  1. 1 State Key Lab of Rolling and Automation,Northeastem University,Shenyang 110004;
    2 Dept of Materials Engincering,Shenyang Institute of Aeronautical Engineering,Shenyang 110034;
    3 Dept of Machine and Automobile,Shenyang Institute of Aeronautical Engineering,Shenyang 110034
  • Received:2007-07-16 Online:2008-02-01 Published:2022-12-14

开坯工艺对易切削奥氏体不锈钢坯表面开裂的影响

李 壮1,2,  吴 迪1, 齐瑞贵3   

  1. 1东北大学轧制技术及连轧自动化国家重点实验室，沈阳110004;
    2沈阳航空工业学院材料工程系，沈阳110034;
    3沈阳航空工业学院机械与汽车学院，沈阳110034
  • 作者简介:李壮(1964-),男，副教授，1986年吉林工业大学毕业，钢铁材料的组织与性能研究。
  • 基金资助:
    国家自然科学基金资助项目(50334010)

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Abstract: The free cutting austenite stainless steel(0.09~0. 10C,0.80~0.82Si,0.40~0.43Mn,0.08~0.09P, 0. 10~0. 11S,9. 14~9.20Ni,18.12～18.30Cr,0.73~0.78Ti)was melted by a 30 kg vacuum induction furnace and broken down to75 mm×75 mm billet with8 pass by a φ450 mm mill.As steel ingot was heated to 1200 ℃ and rolled at 1150~1060℃ in1~4 pass there was not cracking on billet surface but continuously rolled at 950~770 ℃ in 5~8 pass the serious surface cracking of billet occurred. The SEM analysis results indicated that inclusion in steel was mainly manga- nese sulphide - iron sulphide compounded inclusions.The steel billet cracking has been effectively avoided by controlling breakdown with1~8 pass at 1150~1060 ℃.

Key words: Sulphur, , Free Cutting, , Austenite Stainless Steel, , Cracking, , Hot Rolling Process

摘要： 易切削奥氏体不锈钢(%:0.09～0.10C、0.80～0.82Si、0.40～0.43Mn、0.08～0.09P、0.10～0.11S、9.14～9.20Ni、18.12～18.30Cr、0.73～0.78Ti)由30 kg真空感应炉冶炼,Φ450 mm轧机经8道次开坯成75 mm×75 mm坯。当钢锭加热温度1200℃,1～4道次(1150～1060℃)轧制未出现开裂,5～8道次(950～770℃)轧制钢坯出现严重表面裂纹。扫描电镜与能谱分析表明,钢中夹杂物为硫化锰-硫化铁复合夹杂物。通过将1～8道次开坯温度控制在1150～1060℃时,有效地避免了钢坯表面开裂的发生。

关键词: 硫, 易切削, 奥氏体不锈钢, 开裂, 热轧工艺

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