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Mechanical Requirements for A537 CL1, CL2, CL3

Mechanical Requirements for A537 CL1, CL2, CL3

ASTM A537 CL1 plates shall be normalized.A537 Class 2 and Class 3 plates shall be quenched and tempered. The tempering temperature for A537 CL 2 steel plates shall not be less than 1100°F [595°C] and not less than 1150°F [620°C] for Class 3 plates.

Mechanical Requirements for A537 CL1, CL2, CL3

Tensile strength and yield strenght: The material as represented by the tension-test specimens shall conform to the requirements shown in the following table
For A537 CL2 and A537 CL13 plates with a nominal thickness of 3/4 in. [20 mm] and under, the 1 1/2-in. [40 mm] wide rectangular specimen may be used for the tension test, and the elongation may be determined in a 2-in. [50 mm] gage length that includes the fracture and that shows the greatest elongation.
Mechanical Properties
inch and [mm]nd [mm]
Class 1
ksi [MPa]
Class 2
ksi [MPa]
Class 3
ksi [MPa]
Tensile Strength
2-1/2 in. and under 70-90 80-100 80-100
[65 mm and under] [485-620] [550-690] [550-690]
Over 2-1/2 to 4 in 65-85 75-95 75-95
[Over 65 to 100mm] [450-585] [515-655] [515-655]
Over 4 to 6 in A​ 70-90 70-90
[Over 100 to 150 mm] A [485-620] [485-620]
Yield strength, min:
2-1/2 in. and under 50 60 55
[65 mm and under] [345] [415] [380]
Over 2-1/2 to 4 in 45 55 50
[Over 65 to 100 mm] [310] [380] [345]
Over 4 in to 6 in A​ 46 40
[Over 100 to 150 mm] A [315] [275]
Elongation in 2 in  
[50 mm], min, %B 22 22 22
4 in, [100 mm] and under A 20 20
Elongation in 8 in  
[200 mm], min, %B 18  -  -

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