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What is the ASTM A537 steel standard?

What is the ASTM A537 steel standard?

ASTM A537 standard steel is used for fusion-welded pressure vessels and heat-treated carbon-manganese-silicon steel plates for structural use. The supplied steel plates have the following three classes: A537CL1, A537CL2, A537CL3.
ASTM A537 steel plates furnished under this specification have different tensile requirements in the following.  
 Class  Heat 
Treatment
 Thickness Yield Strength, 
min, ksi [MPa]
Tensile Strength, 
min, ksi [MPa]
 A537 Class 1 Normalized 21/2 in. and under [65 mm and under] 50 
[345]
70 
[485]
    Over 21/2 in. 
[Over 65 mm]
45 
[310]
65 
[450]
 A537 Class 2 Quenched and tempered 21/2 in. and under [65 mm and under] 60 
[415]
80 
[550]
    Over 21/2 to 4 in. 
[Over 65 to 100 mm]
55 
[380]
75 
[515]
    Over 4 in. 
[Over 100 mm]
46 
[315]
70 
[485]
 A537 Class 3 Quenched and tempered 21/2 in. and under [65 mm and under] 55 
[380]
80 
[550]
Over 21/2 to 4 in. 
[Over 65 to 100 mm]
50 
[345]
75 
[515]
Over 4 in. 
[Over 100 mm]
40 
[275]
70 
[485]
A537CL1, A537CL2, A537CL3 steel typical applications include pressure vessels designed for moderate and lower temperature service requiring excellent notch toughness as well as API storage tanks.
 

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