Grade SA841 Grade C Class 1
Corresponding Standard ASME SA-841/SA-841M-2023
Steel Plates for Pressure Vessels, Produced by Thermo- Mechanical Control Process (TMCP)
Classification Alloy Steel
SA841 Grade C Class 1 Chemical Element Composition Content (%)
  Component C Si Mn P S Cr Ni Cu Mo Ti V Nb
t≤40mm Minimum Value - 0.15 0.7 - - - - - - 0.006 - -
Maximum Value 0.1 0.5 1.6 0.03 0.015 0.25 0.25 0.35 0.08 0.02 0.06 0.06
  Component C Si Mn P S Cr Ni Mo Ti V Nb
t>40mm Minimum Value - 0.15 1 - - - - - 0.006 - -
Maximum Value 0.1 0.5 1.6 0.03 0.015 0.25 0.25 0.08 0.02 0.06 0.06
SA841 Grade C Class 1 Mechanical Properties
thickness
t
mm
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
t≤40 485~620 ≥345 L0=50mm:≥22
L0=200mm: ≥18
40<t≤65 485~620 ≥345 L0=50mm:≥22
L0=200mm: ≥18
t>65 450~585 ≥310 L0=50mm:≥22
L0=200mm: ≥18

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