Chemical composition and mechanical properties of Q690DR, a Chinese grade of cryogenic pressure vessel steel.
Q690DR Approx. Grade Lookup Table

Chemical Composition

Grade Chemical Composition(Quality Fraction)/%
C≤ Si Mn P≤ S≤ Cu≤ Ni Cr≤ Mo Nb≤ V Ti≤ B≤ Pcm≤
Q690DR 0.13 0.15~0.40 1.00~1.60 0.012 0.005 0.25 0.50~1.35 0.80 0.20~0.80 0.06 0.02~0.06 0.03 0.0020 0.30

Mechanical properties and processing properties

Grade Thickness mm Tensile test Impact test 180°Bending test b=2a
Lower yield strength ReL/MPa Tensile strength Rm/MPa Elongation after fracture A/% Temperature℃ Impact absorption energy KV₂/J Lateral expansion value LE/mm
Q690DR 10～80 ≥690 800～920 ≥16 -40 ≥80 ≥0.64 D=3a