Chemical composition and mechanical properties of Q490RW, a Chinese grade of low-temperature pressure vessel steel.
Q490RW Approximate Grade Lookup Table

Q490RW Chemical Composition

Grade Chemical Composition(Quality Fraction)/%
C≤ Si Mn P≤ S≤ Cu≤ Ni Cr≤ Mo Nb≤ V Ti≤ B≤ Pcm≤
Q490RW 0.15 0.15~0.40 1.20~1.60 0.015 0.008 0.25 0.15~0.40 0.3 ≤0.30 0.05 0.02~0.06 0.03 0.02 0.25

Q490RW Mechanical properties and processing properties

Grade Thickness mm Tensile test Impact test 180°Bending test b=2a
Lower yield strengthᵃ
ReL/MPa		 Tensile strengthRm/MPa Elongation after fracture A/% Temperature℃ Impact absorption energy KV₂/J Lateral expansion valueLE/mm
Q490RW 10～60 ≥490 610～730 ≥17 -20 ≥80 一 D=3a
Note: D is the diameter of the bending indenter; b is the width of the sample; a is the thickness of the sample.
ᵃ When the yielding phenomenon is not obvious, the specified plastic elongation strength Rp0.2 is adopted.