ASTM A537 Class 1, 2 Steel Plates

ASTM A537 standard refers to pressure vessel plates, material in heat-treated, carbon-manganese silicon steel. Based on different strength and heat treatment, it ranges to Class 1, 2 and 3.

The maximum thickness under ASTM A537 Class 1 is 100 mm [4 inch], and 150 mm [6 inch] for Class 2 and Class 3.

Referenced Documents

ASTM Standards:

  • A20/A20M: Specification for General Requirements for Pressure Vessel Plates
  • A435/A435: For Straight-Beam Ultrasonic Examination of Steel Plate
  • A577/A577M: For Ultrasonic Angle-Beam Examination of Steel Plates
  • A578/A578M: For Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications

Manufacturing Notes:

Steel Plate under ASTM A537 Class 1, 2 and 3 shall be killed steel and comply with fine austenitic grain size requirement of Specification A20/A20M.

Heat Treatment Methods

All plates under ASTM A537 shall be heat treated as follows:

ASTM A537 Class 1 plates shall be normalized.

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

Chemical Requirements of ASTM A537 Class 1, 2 and 3

The steel shall conform to the chemical requirements shown in Table 1 unless otherwise modified in accordance with Supplementary Requirement S17, Vacuum Carbon-Deoxidized STeel, in Specification A20/A20M.

Table 1:

Element

Heat Analysis

Product Analysis

Carbon, max A

0.24

Manganese (Tk≤40 mm or 1-1/2 in)

0.70-1.35

0.64-1.46

Manganese B

1.00-1.60

0.92-1.72

Phosphorus, max A

0.025

Sulfur, max A

0.025

Silicon

0.15-0.50

0.13-0.55

Copper, max

0.35

0.38

Nickel, max

0.25

0.28

Chromium, max

0.25

0.29

Molybdenum, max

0.08

0.09

A: Applies to both heat and product analysis.
B: 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 dose not exceed 0.57^ when based upon the following equation:

CE = C + Mn/5 + (Cr+Mo+V)/5 + (Ni+Cu)/15

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.

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 Table 2.

For Class 2 and Class 3 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]

Class 1

Class 2

Class 3

ksi [MPa]

ksi [MPa]

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

Over 4 in [100 mm]

Elongation in 8 in

[200 mm], min, %B

18

C

C

A: Product is not availabe in this size range.
B: See specification A20/A20M for elongation adjustments.
C: There is no requirement for elgonation in 8 in.

Our Supply Range:

Description: Carbon Steel ASTM A537 Class 1, 2, 3
Manufacturing Types: Hot Rolled
Thickness: 2mm to 150 mm
Width: 0.6m to 3m
Length: 6m, 12m, customized
Surface: Natural, Painted
Packing: Standard sea packing, bundled with streel strip.

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