Chemical composition and mechanical properties of Chinese low-temperature pressure vessel steel 08Ni3DR
08Ni3DR Approximate Grade Lookup Table

08Ni3DR Chemical Composition

Grade Chemical Compositionᵃ (Quality Fraction)/%
C Si Mn Ni P S Cr Cu Mo V Nb Alt
≤ ≤ ≥
08Ni3DRᵇ 0.10 0.10~0.35 0.30~0.80 3.25~3.75 0.015 0.005 0.25 0.35 0.12 0.05 0.08 0.015

ᵃ  Except for the 06Ni7DR grade, Cr+Mo+Cu≤0.50%.

ᵇ  When the thickness is greater than 100 mm, the upper limit of C content can be 0.12%.

ᶜ When the thickness is greater than 50 mm, the upper limit of C content can be 0.12%.

08Ni3DR Mechanical properties and processing properties

Grade Thickness mm Tensile testᵃ V-type impact testᵃ 180°Bendingᶜ test b=2a
Lower yield strengthᵇ
ReL/MPa		 Tensile strength Rm/MPa Elongation after fractureA/% Temperature℃ Impact absorption energy KV₂/J
08Ni3DR 6～60 ≥320 490～620 ≥21 -100 ≥60 D=3a
>60～100 ≥300 480～610
>100～150 ≥290 470～600
Note: a is the sample thickness; b is the sample width; D is the diameter of the bending indenter.

ᵃ Transverse specimens are used for tensile and impact tests.

ᵇ When the yield strength is not obvious, Rp0.2 can be used instead of the lower yield strength.

ᶜ For the bending test, a transverse specimen should be used. The specimen width should be twice the plate thickness, and the minimum width should be no less than 20 mm.