AUSTENITIC STAINLESS STEEL WITH EXCELLENT HOLE EXPANDING WORKABILITY AND RESISTANCE OF SEASON CRACKING

摘要

Disclosed is an austenitic stainless steel in which defects such as age cracking or delayed fracture do not occur even after five or more steps of expansion and curing. The austenitic stainless steel having excellent ductworkability and aging crack resistance according to an embodiment of the present invention is, by weight, C: 0.01 to 0.04%, Si: 0.1 to 1.0%, Mn: 0.1 to 2.0%, Cr : 16 to 20%, Ni: 6 to 10%, Cu: 0.1 to 2.0%, Mo: 0.2% or less, N: 0.035 to 0.07%, C+N: 0.1% or less, including the remaining Fe and unavoidable impurities, The Md30 (°C) × Grain Size (µm) value is less than -500.