A537 CLASS 2 Heat treated Boiler steel plate

Classification :

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. The maximum thickness under ASTM A537 Class 1 is 100 mm [4 inch], and 150 mm [6 inch] for Class 2 and Class 3.

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Boiler Pressure Vessel Steel

A537 CL2 Heat treated Boiler steel plate Descriptions:

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.

Chemical Composition and Mechanical Properties:

A537 class 2 Chemical Composition
Grade	The Element Max (%)
Grade	C	Mn	P	S	Si	Cu	Ni	Cr	Mo
A537 class 2	0.24	0.92-1.72	0.035	0.035	0.13-0.55	0.38	0.28	0.29	0.09

Grade	A537 class 2 Mechanical Property
Grade	Thickness	Yield	Tensile	Elongation
A537 class 2	mm	Min Mpa	Mpa	Min %
	-65	415	550-690	22
	65-100	380	515-655	20
	100-150	315	485-620	-

ASTM Standards:

A20/A20M: Specification for General Requirements for Pressure Vessel Plates
A435/A435: For Straight-Beam Ultrasonic Examination of Steel Plate
A577/A577M: For Ultrasonic Angle-Beam Examination of Steel Plates
A578/A578M: For Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications

Manufacturing Notes:

Steel Plate under ASTM A537 Class 1, 2 and 3 shall be killed steel and comply with fine austenitic grain size requirement of Specification A20/A20M.

Heat Treatment Methods:

All plates under ASTM A537 shall be heat treated as follows:
ASTM A537 Class 1 plates shall be normalized.
Class 2 and Class 3 plates shall be quenched and tempered. The tempering temperature for Class 2 plates shall not be less than 1100°F [595°C] and not less than 1150°F [620°C] for Class 3 plates.

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Boiler Pressure Vessel Steel