CLAD STEEL PLATE HAVING AS MATING MATERIAL DUPLEX STAINLESS STEEL HAVING GOOD LINEAR HEATING PERFORMANCE, AND METHOD FOR MANUFACTURING SAME

摘要

In this clad steel plate, with regard to a duplex stainless steel used as the mating material for the clad steel plate, the austenite phase area ratio is 40% to 70%, the calculated value (Npre) of the precipitation starting temperature for a Cr nitride represented by formula (1) is no greater than 920ºC, and the chromium content in the precipitate obtained by performing isothermal heat processing for 3 minutes at 700ºC, and then cutting out only the mating material from the clad steel plate and performing electrolytic extraction residue analysis, is no greater than 0.05%. Npre = 12Cr + 50Si + 36Mo-20Ni-15Mn + 28Cu + 470N-290C + 620...(1)