公开(公告)号：WO2019238787A1

公开(公告)日：2019-12-19

申请号：PCT/EP2019/065408

申请日：2019-06-12

Applicant: AB SANDVIK MATERIALS TECHNOLOGY

Inventor： WIKLUND, Sara ,  FORSMAN, Tomas

IPC: C21D6/00 ,  C21D7/02 ,  C21D7/13 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/58

Abstract: The present disclosure relates to a duplex stainless steels strip manufactured from a duplex stainless steel, wherein the duplex stainless steel comprises the following composition, in weight%: C less than or equal to 0.02; Si 0.05 to 0.40; Mn 0.5 – 3.0; Cr 30.0 to 33.0; Ni 5.0-10.0; Mo 2.0-4.0; N 0.40–0.60; Al 0.010-0.035; B 0.0020-0.0030; Ca 0.0006-0.0040; 5 Cu 0-0.60; V0-0.15; W 0-0.05; Co 0-0.60; Ti 0-0.03; Nb 0-0.03; P less than or equal to 0.03; S less than or equal to 0.02; balance Fe and unavoidable impurities; and wherein the duplex stainless steel consists of 30–70 vol% austenite phase and 70–30 vol% ferrite phase; and wherein the strip has alternating layers of ferrite phase and austenite phase, said alternating layers are essentially parallel with the plane of the object and said alternating 10 layers have an average layer thickness less than or equal to about 10 µm. The present disclosure also relates to a method of producing a strip comprising said duplex stainless steel.