ASTM A537 / A537M

This specification covers heat-treated carbonmanganese-silicon steel plates intended for fusion welded pressure vessels and structures. Plates furnished under this specification are available in three classes.The 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.

Chemical Properties

Carbon, maxA	Manganese		Phosphorus,max	Sulfur,max	Silicon	Copper, max	Nickel, maxB	Chromium, max	Molybdenum, max
	11⁄2 in. [40 mm] and under in thickness:B	Over 11⁄2 in. [40 mm] in thickness:
0.24	0.64–1.46	0.92–1.72	0.025	0.025	0.13–0.55	0.38	0.28	0.29	0.09

Note: A Applies to both heat and product analyses.

B Manganese may exceed 1.35 % on heat analysis, up to a maximum of 1.60 %, and nickel may exceed 0.25 % on heat analysis, up to a maximum of 0.50 %, provided the heat analysis carbon equivalent does not exceed 0.57 % when based upon the following equation:

CE= C+Mn/6 + Cr+Mo+V/5 + Ni+Cu/15

When this option is exercised, the manganese and nickel contents on product analysis shall not exceed the heat analysis content by more than 0.12 % and 0.03 %, respectively.

Mechanical Properties

Class	Tensile strength,min: ksi [MPa]			Yield strength,min: ksi [MPa]			Elongation in 2 in. [50 mm], min, %B		Elongation in 8 in. [200 mm], min, %B
	21⁄2 in. and under [65 mm and under]	Over 21⁄2 to 4 in., incl [Over 65 to 100 mm, incl]	Over 4 to 6 in., incl [Over 100 to 150 mm, incl]	21⁄2 in. and under [65 mm and under]	Over 21⁄2 to 4 in., incl [Over 65 to 100 mm, incl]	Over 4 to 6 in., incl [Over 100 to 150 mm, incl]	4 in. [100 mm] and under	Over 4 in. [100 mm]
Class A	70–90 [485–620]	65–85 [450–585]	A	50 [345]	45 [310]	A	22	A	18
Class B	80–100 [550–690]	75–95 [515–655]	70–90 [485–620]	60 [415]	55 [380]	46 [315]	22	20	C
Class C	80–100 [550–690]	75–95 [515–655]	70–90 [485–620]	55 [380]	50 [345]	40 [275]	22	20	C

Note: A Product is not available in this size range.

C There is no requirement for elongation in 8 in.

Products