What is nuclear power steel 15MnNi

The commonly used material 15MnNi for nuclear power components is a kind of steel based on 15MnVR by reducing the content of V, S and P and adding 0.2% - 0.5% Ni. Although 15MnNi strength is not very high, it has good toughness. The executive standard of nuclear power steel 15MnNi is GB / T3531.

Chemical composition of nuclear power steel 15MnNi:
C: 0.1-0.2%, Si: 0.15-0.37%, Mn: 1.15-1.7%, Ni: 0.5-0.9%, Cr: 0.15-0.25%, Ti: ≤ 0.02%, Vanadium V: ≤ 0.02%.

The mechanical properties of 15MnNi nuclear power steel are as follows:
Tensile strength σb (MPA): ≥ 620 (63)
Yield strength σs (MPA): ≥ 375 (38)
Elongation δ5 (%): ≥ 15
Reduction of area ψ(%): ≥ 40
Impact energy Akv (J): ≥ 39
Impact toughness value αkV (J / cm2): ≥ 49 (5)

Nuclear power steel 15MnNi is widely used in the manufacture of reactor pressure vessel supports, equipment gates, personnel gates and other welding structures. 15MnNi steel is generally delivered in normalized or normalized and tempered condition.