李壮, 吴迪, 齐瑞贵. Effect of Breakdown Process on Surface Cracking of Billet of Free Cutting Austenite Stainless Steel[J]. Special Steel, 2008, 29(1): 37-39.
李壮, 吴迪, 齐瑞贵. Effect of Breakdown Process on Surface Cracking of Billet of Free Cutting Austenite Stainless Steel[J]. Special Steel, 2008, 29(1): 37-39.DOI:
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 ℃.