Pressure Vessel-Grade A537 Class 3 Plate

ASTM A537 Class 3 is a specification for heat-treated, carbon-manganese-silicon steel plates used in pressure vessels. These plates are quenched and tempered to achieve specific mechanical properties. They are typically used in fusion welded pressure vessels and structures.

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Product Description

1.What chemical components are contained in Pressure Vessel-Grade A537 Class 3 Plate?

A537 class 3 Chemical Composition
Grade	The Element Max(%)
Grade	C	Mn	P	S	Si	Cu	Ni	Cr	Mo
A537 class 3	0.24	0.92-1.72	0.035	0.035	0.13-0.55	0.38	0.28	0.29	0.09

2.What are the differences between A537 Class 3 and A537 Class 2?

Comparison Item	A537 Class 3	A537 Class 2
Heat Treatment	Quenched & Tempered (Q&T)	Quenched & Tempered (Q&T)
Yield Strength	≥450 MPa (65 ksi)	≥415 MPa (60 ksi)
Tensile Strength	550-690 MPa (80-100 ksi)	550-690 MPa (80-100 ksi)
Elongation	≥18% (in 50mm gauge length)	≥20% (in 50mm gauge length)
Charpy Impact	≥27J @ -40°C (extendable to -60°C)	≥27J @ -30°C

3.How is the low-temperature toughness of Class 3? Is it suitable for LNG storage tanks?

Impact toughness requirement: Typical value ≥27J @ -40°C (can be customized to -60°C)
LNG applicability: Yes, but requires nickel microalloying (e.g., 0.5% Ni addition) to enhance toughness below -100°C.

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