A537 CL1 Normalized Pressured Vessel Steel Plate

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.
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 

 

A537 class 1 Chemical Composition
Grade	The Element Max (%)
	C	Mn	P	S	Si	Cu	Ni	Cr	Mo
A537 class 1	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 1 Mechanical Property
	Thickness	Yield	Tensile	Elongation
A537 class 1	mm	Min Mpa	Mpa	Min  %
	-65	345	485-620	22
	65-100	310	450-585	-
	100-150	-	-	18

Referenced Documents

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.