ASTM A737 / A737M

This specification covers high-strength low-alloy steel plates for service in welded pressure vessels and piping components. This material is particularly intended for piping and pressure vessel applications where high strength and improved toughness are required. Two grades, designated B and C, are covered by this specification. Grade B provides a minimum yield strength of 50 ksi [345 MPa]. Grade C provides a minimum yield strength of 60 ksi [415 MPa].

Chemical Properties

Grades	Carbon, max	Manganese	Phosphorus, max	Sulfur, max	Silicon	Vanadium	Columbium, max	Nitrogen, max
Grade B	0.22	1.07–1.62A	0.025	0.025	0.10-0.55	-	0.05	-
Grade C	0.24	1.07-1.62	0.025	0.025	0.10-0.55	0.03-0.12	0.05	0.03

Note A: The maximum manganese may be increased to 1.60 % on heat analysis and 1.72 % on product analysis, provided that the carbon content on heat analysis does not exceed 0.18 %.

Mechanical Properties

Grades	Yield Strength, min, ksi [MPa]	Tensile Strength, ksi [MPa]	Elongation in 8 in. [200 mm], min, %A	Elongation in 2 in. [50 mm], min, %A
Grade B	50 [345]	70-90 [485-620]	18	23
Grade C	60 [415]	80-100 [550-690]	18	23

Products