What is the difference between A537 Class 1 and Class 2?

ASTM A537 standard refers to pressure vessel plates, material in heat-treated, carbon-manganese silicon steel. Based on different strength and heat treatment, it ranges to Class 1, 2 and 3.

ASTM A537 / ASME SA537 plate material is heat-treated, carbon-manganese silicon steel. A537 Class 1 plate is normalized and Class 2 plate is quenched and tempered. A537 carbon steel plate offers greater tensile strength than ASTM A516. A537 plate is commonly used in Oil & Gas and Petrochemical industries.

ASTM A537 Class 1

ASTM A537 Class 1 carbon steel plates are engineered to be used in pressure vessel applications.

The material is a normalised steel which is heat treated and as a consequence displays greater yield and tensile strength than the more standard ASTM A516 grades. The steel is ideal for use in pressurised service both in boilers and pressure vessels and BBN Steel supplies A537 Class 1 plates to the world’s leading fabricators who in turn serve the Oil, Gas and Petrochemical industry.

We can supply ASTM A537 Class 1 plates from stock or directly from the mill. We also offer an in house profiling service where the material can be cut to the size or shape you require.

ASTM A537 Class 2

ASTM A537 Class 2 steel is a higher yield and tensile strength material used in the fabrication of pressurised vessels and steel boilers.

The steel includes the alloying of carbon, manganese and silicon and is heat treated using the quenched and tempered method which gives the material its residual strength. Sourced by the world’s leading fabricators, ASTM A537 Class 2 is a material used extensively by the oil, gas and petrochemical industry.

Chemical Composition of ASTM A537 Class 1 & Class 2

A537	C	Si	Mn<40mm	Mn>40mm	P	S	Cr	Mo	Ni	Cu
Class 1	0.24	0.15 - 0.50	0.70 - 1.35	1.00 - 1.60	0.035	0.035	0.25	0.80	0.25	0.35
Class 2	0.24	0.15 - 0.50	0.70 - 1.35	1.00 - 1.60	0.035	0.035	0.25	0.80	0.25	0.35

Mechanical Properties ASTM A537 Class 1 & Class 2

Class 1	Class 1	Class 2	Class 2	Class 2
Yield(MPa)	345	310	415	380	315
Tensile(MPa)	485 - 620	450 - 585	550 - 690	515 - 655	485 - 620
Thickness	< 65	> 65 < 100	< 65	> 65 <1 00	> 100 > 150

Bebon Steel is the premium source in China for A537 Class 1 & 2 pressure vessel steel. If you need more information about A537 Class 1 & 2 pressure vessel steel and a quote, please contact us freely.