Chemical composition and mechanical properties of Chinese low-temperature pressure vessel steel 06Ni7DR
06Ni7DR Approximate Grade Lookup Table

06Ni7DR Chemical Composition

Grade Chemical Compositionᵃ (Quality Fraction)/%
C Si Mn Ni P S Cr Cu Mo V Nb Alt
≤ ≤ ≥
06Ni7DR 0.08 0.05~
0.30		 0.30~
0.80		 6.50~
7.50		 0.008 0.003 0.5 0.35 0.3 0.01 0.03 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%.

06Ni7DR 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 fracture A/% Temperature℃ Impact absorption energy KV₂/J
06Ni7DR 5～30 ≥560 680～820 ≥18 -196 ≥80 D=3a
>30～50 ≥550
>50～80 ≥540
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.