【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。更多还原

【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 to 75mm×75mm billet with 8 pass by aΦ450 mm mill.As steel ingot was heated to 1200℃and rolled at 1150～1060℃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 pass at 1150～1060℃.更多还原