Patent ID: 6905652

Claim:
An austenitic alloy comprising: a degree of structural stability such that −8.135−0.16·[% Ni]+0.532·[% Cr]−5.129·[% N]+0.771·[% Mo]−0.414·[% Cu]<4; a hot ductility such that 10^(2.059+0.00209·[% Ni]−0.017·[% Mn]+0.007·[% Cr]−0.66·[% N]−0.056·[% Mo])>43; a firing limit such that 10^(3.102−0.000296·[% Ni]−0.00123·[% Mn]+0.0015·[% Cr]−0.05·[% N]−0.00276·[% Mo]−0.00137·[% Cu])>1230; a corrosion resistance to an acidic environment such that 10^(3.338+0.049·[% Ni]+0.117·[% Mn]−0.111·[% Cr]−0.601·[% Mo])≦0.5; a corrosion resistance to a reducing environment such that 10^(2.53−0.098·[% Ni]−0.024·[% Mn]+0.034·[% Cr]−0.122·[% Mo]+0.384·[% Cu])<1.5; resistance to intergranular corrosion in oxidizing environments such that 10^(−0.441−0.035·[% Cr]−0.308·[% N]+0.073·[% Mo]+0.022·[% Cu])≦0.10; a PRE value of [% Cr]+3.3×[% Mo]+16×[% N]>44; a nitrogen solubility such that −1.3465+0.0420×[% Cr]+0.0187×[% Mn]+0.0103×[% Mo]−0.0093×[% Ni]−0.0084×[% Cu]is greater than −0.46 and less than −0.32; and wherein said alloy comprises in weight-%: Cr 23-30 Ni 25-35 Mo 3-6 Mn 3-6 N 0.20-0.40 C up to 0.05 Si up to 1.0 S up to 0.02 Cu up to 1.5 the balance iron and normally occurring impurities and additions.