开坯工艺对易切削奥氏体不锈钢坯表面开裂的影响  

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

作　　者：李壮[1] 吴迪[1] 齐瑞贵[2] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室 [2]沈阳航空工业学院机械与汽车学院,沈阳110034

出　　处：《特殊钢》2008年第1期37-39,共3页Special Steel

基　　金：国家自然科学基金(50334010)

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。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. llS, 9. 14 -9.20Ni, 18. 12 -18.30Cr, 0. 73 -0. 78Ti） was melted by a 30 kg vacuum induction furnace and broken down to 75 mm x 75 mm billet with 8 pass by a （φ450 mm mill, As steel ingot was heated to 1 200 ℃ and rolled at 1 150 - 1 060℃ in 1 -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 with 1 - 8 oass at 1 150 - 1 060 ℃.

关 键 词：硫 易切削 奥氏体不锈钢 开裂 热轧工艺 

分 类 号：TG115.6[金属学及工艺—物理冶金]