Chemical composition and mechanical properties of Q490R, a Chinese grade of low-temperature pressure vessel steel.
Q490R 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≤
Q490R 0.09 0.15~0.40 1.20~1.60 0.015 0.008 0.25 ≤0.40 0.3 ≤0.30 0.05 0.02~0.06 0.03 0.002 0.21

Mechanical properties and processing properties

Grade Thickness mm Tensile test Impact test 180°Bending test b=2a
Lower yield strength
ReL/MPa		 Tensile strengthRm/MPa Elongation after fracture A/% Temperature℃ Impact absorption energy KV₂/J Lateral expansion value LE/mm
Q490R 10～60 ≥490 610～730 ≥17 -20 ≥80 一 D=3a