Patent ID: 8043446

Claim:
A high manganese duplex stainless steel with excellent hot workability, comprising (in weight %): 0.018%-0.1% of C; 0.05-2.2% of Si; 3.52-7.8% of Mn; 20-27.8% of Cr; 3.0-9.5% of Ni; 0.08-0.5% N; up to 4.15% Mo; 3.41-8% W; less than 1.0% Cu; less than 0.4% Ti; the balance Fe and inevitable impurities and wherein Mo and W meet the condition: Mo+0.5W=1.0-4.4% and having a reduction in area of 50% or more when measured at 1,050° C. and a corrosion rate of less than 0.36 mm/year as determined by weight loss after exposure in a 10% FeCl 2 .6H 2 O solution for 72 hours at room temperature.