Grade Q550NQR1
Corresponding Standard Q/BQB 340-2018
Continuously Hot-Rolled Corrosion Resisting Steel Sheet and Strip for Structural Use
Classification Alloy Steel
Q550NQR1 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value - - - - - 0.3 - 0.2
Maximum Value 0.16 0.75 2 0.025 0.02 1.25 0.65 0.55
Q550NQR1 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Impact Energy Absorption
KV2
J
Plate, strip; t≤6 Hot Rolling ≥600 ≥550 ≥18 -40°C (Test Temperature)
≥60
Plate, strip; 6<t≤12 Hot Rolling ≥600 ≥550 ≥18 -40°C (Test Temperature)
≥60

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