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SA-204 Grade A, B, C

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.

Chemical Requirements

*Elements represented in percentage

Elements Composition %
Grade A Grade B Grade C
Carbon, max:
 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  0.025 0.025 0.025
Sulfur, max  0.025 0.025 0.025
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

Tensile Requirements

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