Chemical composition and mechanical properties of 11MnNiMoDR, a Chinese grade of low-temperature pressure vessel steel.
11MnNiMoDR ​​Approximate Grade Lookup Table

11MnNiMoDR Chemical Composition

Grade Chemical Composition(Quality Fraction)/%
C Si Mn Ni Mo V Nb Altᵃ N P S
11MnNiMoDRᵇ ≤0.14 0.15~0.50 1.20~1.60 0.40~0.90 0.10~0.30 ≤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.

ᵇ When the steel plate thickness is less than 12 mm, there is no requirement for the lower limit of Mo content.

11MnNiMoDR 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 fracture A/% Temperature℃ Impact absorption energyKV₂/J
≥ ≥
11MnNiMoDR Quenching + Tempering 5～60 560～670 420 19 -70 60 D=3a
>60～80 400
>80～100 380