AUSTENITIC STAINLESS STEEL

摘要

An austenitic stainless steel which is reduced in shape change through heating/cooling after cold working. The steel consists of, in terms of wt.%, up to 0.03% carbon, 2 to 4% silicon, 0.1 to 2% manganese, up to 0.03% phosphorus, up to 0.03% sulfur, 9 to 15% nickel, 15 to 20% chromium, 0.02 to 0.2% nitrogen, up to 0.03% niobium, 0.2 to 4% one or both of molybdenum and copper, and iron and impurities as the remainder, and satisfies the following relationships (1) and (2). When the steel satisfies the following relationship (3) besides the relationships (1) and (2), it further has satisfactory weldability. 16.9+6.9Ni+12.5Cu-1.3Cr+3.2Mn+9.3Mo -205C-38.5N-6.5Si-120Nb>=40 (1) 450-440(C+N)-12.2Si-9.5Mn-13.5Cr -20(Cu+Ni)-18.5Mo<=-90 (2) 8.2+30(C+N)+0.5Mn+Ni-1.1(1.5Si+Cr+Mo)+2.5Nb<=-0.8 (3) The elemental symbols in the relationships (1), (2), and (3) represent the contents (wt.%) of the respective elements in the steel.