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Heat Treated Carbon - Manganese - Silicon Steel Pressure Vessel Plates
 

SA-537

Overview

This grade is commonly used in pressure vessel applications where low temperature resistance to notch sensitivity is needed and added strength levels are needed. Class 1 is normalized and the tensile is in the 70,000 – 90,000 level. Class 2 is quenched and tempered with a tensile range of 80,000 – 100,000. Minimum yield strength for class 1 is 50,000 and for class 2 is 60,000.

 Download SA-537 Chemical and Tensile Requirements PDF (63 KB)

Chemical Requirements

ElementComposition %
Carbon, maxA 0.24
Manganese:  
  1 in. (40 mm) and under in thicknessB  
    Heat analysis 1.00-1.60
    Product analysis 0.64-1.46
  Over 1 in. (40 mm) in thickness  
    Heat analysis 1.00-1.60
    Product analysis 0.92-1.72
Phosphorus, maxA 0.035
Sulfur, maxA 0.040
Silicon  
    Heat analysis 0.15-0.50
    Product analysis 0.13-0.55
Cooper, max:  
    Heat analysis 0.35
    Product analysis 0.38
Nickel, max:  
    Heat analysis 0.25
    Product analysis 0.28
Chromium, max:  
    Heat analysis 0.25
    Product analysis 0.29
Molybdenum, max:  
    Heat analysis 0.08
    Product analysis 0.09

AApplies to both heat and product analysis
BManganese may exceed 1.35 on heat analysis up to a maximum of 1.60, provided that the heat analysis carbon equivalent does not exceed 0.57%

Tensile Requirements

 Class 1
ksi(MPa)
Class 2
ksi (MPa)
Tensile strength, ksi (MPa)    
  2-1/2 in. and under 70-90 80-100
  (65mm and under) (485-620) (550-690)
  Over 2-1/2 to 4 in., incl 65-85 75-95
  (Over 65 to 100 mm, incl) (450-585) (515-655)
  Over 4 to 6 in., incl ... 70-90
  (Over 100 to 150 mm, incl) ... (485-620)
Yield strength, min.    
  2-1/2 in. and under 50 60
  (65mm and under) (345) (415)
  Over 2-1/2 to 4 in., incl 45 55
  (Over 65 to 100 mm, incl) (310) (380)
  Over 4 to 6 in., incl ... 46
  (Over 100 to 150 mm, incl) ... (315)
Elongation in 2 in.    
  (50 mm), min. %    
  4 in. (100 mm) and under 22 22
  Over 4 in. (100 mm) ... 20
Elongation in 8 in.    
  (200 mm), min, % 18A ...

ASee Specification A 20/A 20M.