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Carbon-Molybdenum Alloy Steel Pressure Vessel Plates
 

SA-204

Overview

This carbon / molybdenum grade is used almost exclusively in Refinery / Petrochemical applications. The “lean alloy” characteristics of this grade lends itself to use in pressure vessels, fittings, and custom fabricated pipe and other environments within moderate temperature ranges.

 Download SA-204 Chemical and Tensile Requirements PDF (133 KB)

Chemical Requirements

ElementsComposition %
Grade AGrade BGrade C
Carbon, maxA:
  up to 1 in. [25 mm] incl. in thickness 0.18 0.20 0.23
  Over 1 in. to 2 in [50 mm] incl. in thickness 0.21 0.23 0.26
  Over 2 in. to 4 in. [100 mm] incl. in thickness 0.23 0.25 0.28
  Over 4 in. [100 mm] incl. in thickness 0.25 0.27 0.28
Manganese, max:
  Heat analysis: 0.90 0.90 0.90
  Product analysis: 0.98 0.98 0.98
Phosphorus, max A 0.035 0.035 0.035
Sulfur, max A 0.040 0.040 0.040
Silicon:
  Heat analysis 0.15-0.40 0.15-0.40 0.15-0.40
  Product analysis 0.13-0.45 0.13-0.45 0.13-0.45
Molybdenum:
  Heat analysis 0.45-0.60 0.45-0.60 0.45-0.60
  Product analysis 0.41-0.64 0.41-0.64 0.41-0.64

AApplies to both heat and product analysis

Tensile Requirements

 Grade AGrade BGrade C
ksi[MPa]ksi[MPa]ksi[MPa]
Tensile strength 65-85 [450-585] 70-90 [485-620] 75-95 [515-655]
Yield strength, min.A 37 [255] 40 [275] 43 [295]
Elongation in 8 in. [200 mm], min, % 19B 17B 16B
Elongation in 2 in. [50 mm], min, % 23B 21B 20B

ADetermined by either the 0.2% offset method or the 0.5% extension-under-load-method.
BSee Specification A 20/A 20M.