ASTM A537 Class 1 carbon steel plates, typically used for pressure vessels, require a minimum yield strength of 35-50 ksi (240-345 MPa), tensile strength of 65-90 ksi (450-620 MPa), and 21-22% minimum elongation, depending on thickness. These normalized/tempered plates offer high strength and toughness for moderate-to-low temperature service.
| Grade 2 and 12 | Grade 11 | Grade 22, 21, 5, 7, 9 | |
| Tensile strength, ksi [MPa] | 55 to 80 [380 to 550] | 60 to 85 [415 to 585] | 60 to 85 [415 to 585] |
| Yield strength min. ksi [MPa] | 33 | 35 | 30 |
| Elongation in 8 in. [200 mm], min. %A | 18 | 19 | |
| Elongation in 2 in. [50 mm], min. %A | 22 | 22 | 18 |
| Reduction of area, min % | 45B 40C |
A. See Specification A 20/A 20M.
B. Measured on round test specimens.
C. Measured on flat specimen
Tensile Requirements For Class 2 Plates
| Grade 2 | Grade 11 | Grade 12 | Grade 22, 21, 5, 7, 9 | Grade 91 | |
| Tensile strength, ksi [MPa] | 70 to 90 [485 to 620] |
75 to 100 [515 to 690] |
65 to 85 [450 to 585] |
75 to 100 [515 to 690] |
85 to 110 [585 to 760] |
| Yield strength min. ksi [MPal]/(0.2% offset) | 45 [310] | 45 [310] | 40 [275] | 45 [310] | 60 [415] |
| Elongation in 8 in. [200 mm], min. %B | 18 | 18 | 19 | ... | ... |
| Elongation in 2 in. [50 mm], min. %B | 22 | 22 | 22 | 18 | 18 |
| Reduction of area, min % | ... | ... | ... | 45C 40D |
... |
A. Not applicable to anneaied material.
B. See Specification A 20/A 20M. elongation adjustments
C. Measured on round test specimen
D. Measured on flat specimen
Applications
ASTM A537 steel plates are commonly used in:
Construction of pressure vessels for the oil and gas industry.
Manufacturing of industrial storage tanks and equipment.
Structural applications where high strength and toughness are required, particularly in severe environments.
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