UR 2205Mo Steel

Steel name: UR 2205Mo
Diagram No.: 7452
Type of diagram: TTP
Mat. No. (Wr. Nr.) designation: 1.4462
DIN designation: X2CrNiMo22-5-3
UNS designation: S31803/UNS S32205
ASTM designation: A240
Chemical composition in weight %: 0.020% C, 22.50% Cr, 3.10% Mo, 5.80% Ni, 0.17% N
Steel group: Duplex stainless steels
Note: UR 2205Mo is a duplex stainless steel; its chemical composition is optimized in order to present, after a solution annealing treatment at 1040 - 1080°C (1900 - 1975°F) followed by water quenching, a nearly 50% alpha /50% gamma microstructure. Heat treatments performed at 1100°C (2010°F). A higher temperature may result in an increase of the ferrite content. Typical TTP - diagram (temperature time precipitation) shows the two - phase transformation areas. At high temperature: 600° - 1000°C (1110/1830°F), the a phase may transform in sigma, . ,... intermetallic phases which makes the alloy brittle. At lower temperatures (300 - 500°C - 570 - 930°F) the a phase transforms in alpah resulting in a hardening of the structure after several hours holding time.
Reference: Not shown in this demo version.

Transformation Diagram

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