2 l/4 Cr-1 Mo Steel

2 l/4 Cr-1 Mo Steel

Steel name: 2 l/4 Cr-1 Mo
Diagram No.: 2832
Chemical composition in weight %: 0.12% C, 0.21% Si, 0.42% Mn, 0.011% P, 0.011% S, 2.17% Cr, 0.93% Mo, 0.16% Ni, 0.003% Al
Steel group: Alloyed steels
Properties: No data
Applications: No data
Reference: Not shown in this demo version.

Heat Treatment
Hardening: No data
Tempering: See the diagram.
Diagram note: Tempering diagram for 2 l/4 Cr-1 Mo steel reported by Nutting. The variety of phases observed following the ion irradiation indicates that complex phase reactions have occurred in this alloy. The precipitation response summarized in tabl may be compared to the tempering chart compiled by Nutting for a 24 Cr-I Mo steel, shown in fig.. First, it is predicted that no tempering of the unirradiated control structures should occur at 5OO”C, in agreement with observations of the control region after the = 30 hours of irradiation time at 500°C. Second. the irradiation appears to have accelerated the carbide evolutionary sequence as the more mature carbides, M,C and M,C,, have replaced the Fe& phase present in the original upper and lower bainite structures. This carbide distribution of M,C and M,C, would normally form during aging at temperatures in excess of 600°C for the period of irradiation. Third, the x and G phases which formed in the original bainite and ferrite structures respectively during the irradiation do not appear on the tempering diagram. These radiation- induced phases have not been previously reported to form in irradiated 2 l/4 Cr-1 MO steel.

Tempering Diagram

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