Quality Controlling Techniques in Ultra-thin Hot Strip Production Line of Tangshan Iron and Steel Co. Ltd

The advanced techniques of ultra-thin hot strip production line at Tanggang were introduced, which include H² mould,dynamic soft reduction,dynamic PC control,semi-endless rolling,ferrite rolling etc. The production survey shows that the stresses in the shell in H² mould are less than in general funnel mould, so there are less cracks in the shell. Optimized roller line device and dynamic soft reduction ensure the internal quality of billet. Semi-endless rolling solves the problem of the strips polling and swing. Dynamic PC control and working bending roll guarantees the stability of the strip's quality. The three-point descaling, especially about the intermediate cooling system between roughing mill and finishing mill, can not only improve the strip surface quality but also support the rolling in ferrite area.