ASME SA537 Class 1 and ASTM A537 Class 1

Large stocks of plates certified to ASME SA537 Class 1 and ASTM A537 Class 1 are held in Brown McFarlane's warehouse and processing facilities.

We are also world-leading stockists and processors of other ASME and ASTM carbon steel pressure vessel plates manufactured and certified to:

ASTM A516 Gr. 70            ASME SA516 Gr. 70

ASTM A516 Gr. 65            ASME SA516 Gr. 65

ASTM A516 Gr. 60            ASME SA516 Gr. 60

ASTM / ASME A / SA 516 Gr. 60 / 65 / 70 HIC

The A537 / SA537 standard, its full name is “Standard Specification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel”, is intended use in the manufacture of fusion welded pressure vessels and structures.

The material under this specification is available in three classes. Class 1 steel is supplied in the normalised condition and the specification covers plates up to 100 mm (4 inches) in thickness.

ASME SA537 Class 1 / ASTM A537 Class 1 - the specification

Chemical Requirements

 Element  Thickness  Composition (%)  Note
 Carbon (max)  0.24 A, B
 Manganese  40 mm and under  0.70 - 1.35 A, C
   40 mm and under  0.64 - 1.46 B, C
   Over 40 mm  1.00 - 1.60 A, C
   Over 40 mm  0.92 - 1.72 B, C
 Phosphorus (max)    0.035 A, B 
 Sulphur (max)    0.035 A, B 
 Silicon    0.15 - 0.50
     0.13 - 0.55 B
 Copper (max)    0.35
     0.38 B
 Nickel (max)    0.25 A, C
     0.28 B, C
 Chromium (max)    0.25 A
     0.29 B
 Molybdenum (max)    0.08 A
     0.09 B

Notes: A - heat analysis, B - product analysis, C - Manganese may exceed 1.35% on heat analysis, up to a maximum of 1.60%, and Nickel may exceed 0.25% on heat analysis, up to a maximum of 0.50%, provided the heat analysis carbon equivalent (long formula) does not exceed 0.57%. When this option is exercised, the Manganese and Nickel contents on product analysis shall not exceed the heat analysis content by more than 0.12% and 0.03% respectively.

Tensile Requirements

Mechanical Property  Value
Tensile Strength, MPa (ksi)  485 - 620 (70 - 90) 
Yield Strength, min MPa (ksi) 345 (50) 
Elongation min, % 200 mm (8 in) 18 
Elongation min, % 50 mm (2 in)  22 

Note: The above values are applicable to plates 65 mm and under. Values for thicker plates are available from our sales and technical teams.

Additional Properties - ASME SA20 / ASTM A20

The specifications ASTM A20 or ASME SA20 (Specification for General Requirements for Steel Plates for Pressure Vessels) contain a list of supplementary requirements which can be added to the basic A537 / SA537 specification when additional control, testing, or examination is required to meet end use requirements.

These supplementary requirements, there are seventeen of them, are designated numbers (S1, S2, S3, and so on) and cover things like ultrasonic testing (S8, S11 or S12 depending on the type of ultrasonic test), charpy v-notch impact tests (S5), and product chemical analysis (S2).

As a matter of course, and in order to provide the best possible service to our customers, Brown McFarlane stocks ASME SA537 Class 1 and ASTM A537 Class 1 plates with numerous supplementary requirements included at the time of manufacture and all noted on the material test certificate supplied with each plate.

For more information please contact our sales teams. Click here to go to the page giving contact details.


Plate Cutting

Plate Processing

  • Weld preparations
  • Grinding
  • Drilling and tapping
  • Pressing
  • Machining
  • Shotblasting and painting
  • Rolling
  • Rolled shells
  • Dished ends
  • Clad plates


Boiler and Pressure Vessel Steel Plate pdf

The largest stock in the UK with plate up to 4m wide and 20m long from 3mm to 200mm thick. 

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