CONTINUOUS CASTING METHOD OF DUPLEX STAINLESS STEEL CONTAINING TUNGSTEN

摘要

PURPOSE: A continuous casting method of a duplex stainless steel containing tungsten is provided to prevent a linear defect on the surface in a subsequent process by controlling the formation sigma phase that tends to segregate along the grain boundary of a continuous-casted slab, consequently causing cracking. CONSTITUTION: The difference between a molten steel temperature for stainless steel and a theoretical solidification temperature is maintained in the range of 10 to 30deg.C in a tundish(3). The flow rate of cooling water is maintained in the range of 2900 to 3100 liter in the long side and 440 to 460 liter in the short side at the molten steel feed side in a mold(4). A sliding gate is installed between the tundish(3) and the mold(4) to control the flow of molten steel(1). The temperature difference of cooling water is maintained 4.5 to 5.0deg.C at the outlet side of the continuous-casted slab(6). The amount of water is maintained in the range of 0.25 to 0.30L/kg in the second cooling zone(5).