ALLOYING ELEMENT-SAVING HOT ROLLED DUPLEX STAINLESS STEEL MATERIAL, AND PRODUCTION METHOD FOR SAME

摘要

The present invention refers to a clad steel plate comprising: a steel plate of a base metal; and a steel plate of a cladding material joined to either or both of two main surfaces of the steel plate of the base metal by hot rolling, wherein the cladding material consists of a duplex stainless steel, the duplex stainless steel contains, by mass%:C: 0.03% or less;Si: 0.05% to 1.0%;Mn: 0.5% to 7.0%;P: 0.05% or less;S: 0.010% or less;Ni: 0.1% to 5.0%;Cr: 18.0% to 25.0%;N: 0.05% to 0.30%; andAl: 0.001% to 0.05%, andfurther contains one or more selected from:V: 0.05% to 0.5%;Nb: 0.01% to 0.20%; andTi: 0.003% to 0.05%,with a remainder being Fe and inevitable impurities, and a chromium nitride precipitation temperature TN2, which is a second index regarding precipitation of chromium nitrides during the hot rolling, is in a range of 800 C to 970 C.