| 摘要 |
PURPOSE:To produce a high-toughness clad steel having excellent formability and corrosion resistance by forming an assembled composite with the cladding material and base material respectively having a specified quality, heating, rolling, and cooling the composite in succession under specified temp. conditions. CONSTITUTION:The assembled composite is formed with a cladding material consisting of austenitic stainless steel and one kind of austenitic Ni-based alloy and a base material consisting of the carbon steel or low-alloy steel contg. <=0.2wt.% C and preferably <=0.005-0.03wt.% Ti. The composite is heated to >=1,050 deg.C, rolling is finished so that the mean temp. of the cladding material is kept at >=900 deg.C, and the rolled composite is slowly cooled to 800-850 deg.C at a rate of <2 deg.C/sec. When the slow cooling is finished, the composite is cooled to 450-550 deg.C from >=800 deg.C at a mean rate of 2-20 deg.C/sec, and then air-cooled. By this method, a clad steel sheet with the corrosion resistance improved by the cladding material and the strength and toughness by the base material is obtained. |
