Chinese steel producer Shandong Iron & Steel Rizhao has issued the Final Acceptance Certificate for the new high-capacity hot strip only seven months after rolling the first coil.
The hot strip mill is part of a large-scale order which the Chinese steel producer had placed with SMS group. The complete order comprises the hot strip mill, a coupled pickling line and tandem cold mill, two continuous annealing lines and a hot-dip galvanizing line.
The high-capacity hot strip mill has a maximum annual capacity of 4.8 million tons and produces strips with a maximum width of 1,900mm. The final strip thicknesses range between 1.2 and 25.4mm. The main mill equipment includes a descaler in the roughing mill, a slab sizing press, a two-high reversing roughing mill stand, a four-high reversing roughing mill stand with edger, heat panels on the delay roller table to the finishing mill, a crop shear, a descaler at the entry side of the finishing mill, seven finishing mill stands, a laminar strip cooling section and three down coilers for the finish-rolled hot strip.
This mill configuration provides Shandong Iron & Steel Rizhao high flexibility in hot wide strip production. This flexibility lies with the slab sizing press at the entry of the hot strip mill, which achieves width reductions of up to 350mm. The two high-capacity roughing mill stands allow a great variation in pass schedule calculation.
For thickness control, all finishing mill stands are equipped with hydraulic screw-down actuators. The proven Continuously Variable Crown® plus system with integrated work roll bending ensures a high-quality strip profile, strip contour and strip flatness.
The Profile, Contour and Flatness Control® system calculates the correct shifting position of the specially ground work rolls and the setup values for work roll bending, resulting in the ideal roll gap for each strip rolled.
