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Nickel Alloy Steel Pressure Vessel Plates
 

SA-203

Overview

This mid range carbon / manganese grade has a 3.5% nickel content as it's only alloying element and offers excellent impact resistance for more extreme environments down to -150° F. Most applications for this grade is in pressure vessels, tanks, and components where good ductility and impact resistance in needed for low temperature ranges.

 Download SA-203 Chemical and Tensile Requirements PDF (133 KB)

Chemical Requirements

ElementsComposition %
Grade AGrade BGrade DGrade E and F
Carbon, maxA:
  up to 2 in. (50 mm) in thickness 0.17 0.21 0.17 0.20
  over 2 to 4 in. (100 mm) incl. in thickness 0.20 0.24 0.20 0.23
  over 4 in. (100 mm) incl. in thickness 0.23 0.25 ... ...
Manganese, max
  Heat analysis:
    2 in. (50 mm) and under over 2 in. (50 mm) 0.70 0.70 0.70 0.70
    and under over 2 in. (50 mm) 0.80 0.80 0.80 0.80
  Product analysis:
    2 in. (50 mm) and under 0.78 0.78 0.78 0.78
    over 2 in. (50 mm) 0.88 0.88 0.88 0.88
Phosphorus, max A 0.035 0.035 0.035 0.035
Sulfur, max A 0.040 0.040 0.040 0.040
Silicon:
  Heat analysis 0.15-0.40 0.15-0.40 0.15-0.40 0.15-0.40
  Product analysis 0.13-0.45 0.13-0.45 0.13-0.45 0.13-0.45
Nickel:
  Heat analysis 2.10-2.50 2.10-2.50 3.25-3.75 3.25-3.75
  Product analysis 2.03-2.57 2.03-2.57 3.18-3.82 3.18-3.82

AApplies to both heat and product analysis

Tensile Requirements

 Grade A & DGrade B and EGrade F
ksi[MPa]ksi[MPa]ksi[MPa]
Tensile strength
  2 in. (50 mm) & under 65-85 [450-585] 70-90 [485-620] 80-100 [550-690]
  over 2 in. (50 mm) 65-85 [450-585] 70-90 [485-620] 75-95 [515-655]
Yield strength, min.
  2 in. (50 mm) & under 37 [255] 40 [275] 55 [380]
  over 2 in. (50 mm) 37 [255] 40 [275] 50 [345]
Elongation in 8 in. (200 mm), min, %A 19 17  
Elongation in 2 in. (50 mm), min, %B 23 21 20

ASee Specification A 20/A 20M.
BSee 7.1.1