Chemical composition and mechanical properties of 13MnNiDR, a Chinese grade of low-temperature pressure vessel steel.
13MnNiDR Approximate Grade Lookup Table

13MnNiDR Chemical Composition

Grade Chemical Composition(Quality Fraction)/%
C Si Mn Ni Mo V Nb Altᵃ N P S
13MnNiDR ≤0.16 0.15~0.50 1.20~1.60 0.30~0.80 ≤0.08 ≤0.05 ≤0.050 ≥0.020 ≤0.012 ≤0.015 ≤0.005
ᵃ When acid-soluble aluminum (Als) is used instead of Alt, the Al content should not be less than 0.015%; when Nb+V+Ti in the steel is ≥0.015%, the Al content is not required.

13MnNiDR Mechanical properties and processing properties

Grade Delivery status Thickness mm Tensile test Impact test 180°Bending test b=2a
Tensile strengthRm/MPa Lower yield strength
ReL/MPa		 Elongation after fractureA/% Temperature℃ Impact absorption energy KV₂/J
≥ ≥
13MnNiDR Normalizing or
Normalizing + Tempering		 5～36 490～610 345 22 -60 60 D=3a
>36～60 335
>60～100 325