ASTM A537 / A537M Standard Specification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel,intended for fusion welded pressure vessels and structures.
ASTM A537 steel maximum thickness of plates furnished under this specification is 4 in. [100 mm] for Class 1 and 6 in. [150 mm] for Class 2 and Class 3.
ASTM A537 class1/class 2/class 3 steel chemical composition
C max 0.24,
Mn thick≤11/2in,(40mm)
heat analysis 0.70-1.35 product analysis 0.64-1.46
Thick>11/2in,(40mm)
heat analysis 1.00-1.60 product analysis 0.92-1.72
P max 0.035
S max 0.035
Si heat analysis 0.15-0.50 product analysis 0.13-0.55
Cu max heat analysis 0.35 product analysis 0.38
Ni max heat analysis 0.25 product analysis 0.28
Cr max product analysis 0.25 product analysis 0.29
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