Strip or sheet duplex stainless steel with the microstructure ferritic martensitic and method for its production

摘要

Stainless steel sheet and strip structure in double phase steel and method for their production.The present invention relates to a stainless steel sheet of high strength dual phase structure steel strip and which have excellent corrosion resistance.The stainless steel sheet structure in dual stage and strip steel with a hardness of 200hv Vicker or more and which contain, in mass%, C: 0.02 to 0.20%, Si: 0.10 to 2.0%, Mn: 0.20 2.0%, P: 40% or less, s: 0.010% or less Cr: 15.0 to 18.0%, Ni: 0.5 to 4.0%, SN: 0.05 to 0.50 and N: 0.010 to 0.10%, with a sym P in the range of 60 to 95.With the remaining substantially Fe and having a structure of double phase ferrite and formed by heating in the region martensita dual stage of ferrite and austenite, then,The transformation of austenitic phase in martensita in subsequent cooling process, in which sym P = 420C + 470n + 23ni-7mn-9cu-11.5cr-11.5si-12mo-7sn-49ti-47nb-52al-189.