ASTM A240/A240M Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications.

Duplex (Austenitic-Ferritic) steel

Type: 2205
UNS Designation : S32205

Chemical Composition Requirements, %, Max.

C: 0.030
Mn: 2.00
P: 0.030
S: 0.020
Si: 1.00
Cr: 22.0-23.0
Ni: 4.5-6.5
Mo:3.0-3.5
N: 0.14-0.20

Mechanical Test Requirements

Tensile Strength, min: 655Mpa
Yield Strength, min: 450MPa
Elongation in 2 in. or 50 mm, min, %: 25
Hardness, max.: Brinell :293 Rockwell C scale: 31
Cold bend: not required