ASTM A537 Class 1

Download data sheet

General Product Description

The ASTM A537 specification is the Standard Specification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel used in the applications of fusion welded pressure vessels and structures. Typical applications are pressure vessels designed for moderate and lower-temperature service requiring excellent notch toughness as well as API 650 and API 620 storage tanks. Class 1 material is available as Normalized and Class 2 is available as Quenched & Tempered plates.

Dimension Range

Thickness
(inmm)
Thickness
(inmm)
0.375 - 2.009.52 - 50.8
Width
(inmm)
72 - 1231800 - 3120
Length
(inmm)
240 - 6006100 - 15200

Thickness: Inquire for thicknesses <0.375 in. and down to 0.197 in. and for thicknesses >2.00 in. up to 3.60.

Width: Inquire for widths <72 in. and down to 60 in. and for widths >123 in. up to 131.9 in.

Length: Inquire for lengths <240 in. down to 73 in and for lengths slightly >600 in.

Mechanical Properties

Tensile testing is performed in the transverse direction according to ASTM A20 requirements. The required mechanical properties are tabulated below:

Grade
Grade
A537 Class 1
Yield strength
(min ksi)
50
Tensile strength
(ksi)
70 - 90
Elongation in 2"
(min %)
22
Elongation in 8"
(min %)
18

Mechanical testing

Charpy V-Notch Impact Toughness requirements may be ordered as a supplementary requirement (S5). A minimum Charpy V-notch impact energy value of 30 ft-lbs [41 J] at - 40°F [-40°C] in longitudinal specimens is a typical supplemental impact toughness requirement. Please inquire for applications requiring a specified minimum impact toughness.

Chemical Composition

(Heat Analysis, wt. %, maximum unless indicated)

Meets chemical requirements of ASTM A537 Class 1/SA537 Class 1, as shown below. ASTM A20 limits apply to unspecified elements.

C
(max wt %)
C
(max wt %)
0.24
Mn 1)
(max wt %)
1.60
P 2)
(max wt %)
0.020
S 2)
(max wt %)
0.010
Si
(max wt %)
0.50
Cu
(max wt %)
0.35
Ni 1)
(max wt %)
0.25
Cr
(max wt %)
0.25
Mo
(max wt %)
0.080

1) 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 (CEV) does not exceed 0.57 %.

2) P and S are more restrictive than A537/SA537 requirements. Even lower limits for P and S are available on an inquiry basis.

Carbon Equivalent

Thickness (inmm)
Thickness (inmm)
Typical CET (wt %)
0.375 - 2.009.52 - 50.8
0.31
Thickness (inmm)
Thickness (inmm)
Typical CEV (wt %)
0.375 - 2.009.52 - 50.8
0.43

Available Chemistries: Carbon equivalent (CEV) restrictions for weldability are available as a supplementary requirement (S20). Please inquire for additional chemistry restrictions.

Tolerances

Thickness, width, and length tolerances for A537 Class 1/SA537 Class 1 meet ASTM A20 requirements. The flatness tolerance for as-supplied product is ½ ASTM A20. Thicknesses <0.375" (0.250"-0.374") will only be supplied to full standard ASTM A20 flatness tolerance.

Delivery Conditions

ASTM A537 Class 1/ SA537 Class 1 is supplied in the normalized condition.

Formability properties

A537 Class 1/ SA537 Class 1 exhibits excellent cold forming characteristics. Shear burrs and heat-affected zones of thermal cut edges on or near the bend axis as well as sharp corners on edges and on gas cut or punched holes located on or adjacent to the bend axis should be removed by grinding prior cold forming. The following recommended minimum inside bend radius, R, and die width opening, W, as a function of bending orientation are provided:

Thickness
(in. [mm])
Thickness
(in. [mm])
0.375 – 1.00 [9.5 – 25.4]
Bend Axis Perpendicular to Rolling Direction Inside Radius, R (min.)
1.5t
Bend Axis Perpendicular to Rolling Direction Die Width, W (min.)
8t
Bend Axis Parallel to Rolling Direction Inside Radius, R (min.)
2.25t
Bend Axis Parallel to Rolling Direction Die Width, W (min.)
10t
Thickness
(in. [mm])
Thickness
(in. [mm])
1.00 – 2.00 [25.4 – 50.1]
Bend Axis Perpendicular to Rolling Direction Inside Radius, R (min.)
2.0t
Bend Axis Perpendicular to Rolling Direction Die Width, W (min.)
8t
Bend Axis Parallel to Rolling Direction Inside Radius, R (min.)
3.0t
Bend Axis Parallel to Rolling Direction Die Width, W (min.)
10t

Weldability

Welding of A537 Class 1/ SA537 Class 1 shall be performed in accordance with applicable welding code. In the absence of a specified welding code, the following minimum preheat and interpass temperatures and welding consumables are provided. Special welding consumables and welding procedures may be required to avoid detrimental effects on the mechanical properties of the base metal. Low hydrogen practices are strongly recommended.

Welding process
Welding process
Shielded Metal Arc (SMAW)
Thickness
(in. [mm])
≤3/4 [≤19]
Minimum Preheat and Interpass Temperature
(°F [°C])
50 [10]
Consumables
AWS E7015-X, E7016-X, E7018-X
Welding process
Welding process
Shielded Metal Arc (SMAW)
Thickness
(in. [mm])
>3/4 – 1.5 [19 – 38]
Minimum Preheat and Interpass Temperature
(°F [°C])
50 [10]
Consumables
AWS E7015-X, E7016-X, E7018-X
Welding process
Welding process
Shielded Metal Arc (SMAW)
Thickness
(in. [mm])
>1.50 – 2.00 [>38 – 50]
Minimum Preheat and Interpass Temperature
(°F [°C])
150 [65]
Consumables
AWS E7015-X, E7016-X, E7018-X
Welding process
Welding process
Gas Metal Arc (GMAW)
Thickness
(in. [mm])
≤3/4 [≤19]
Minimum Preheat and Interpass Temperature
(°F [°C])
50 [10]
Consumables
AWS ER70S-X
Welding process
Welding process
Gas Metal Arc (GMAW)
Thickness
(in. [mm])
>3/4 – 1.5 [19 – 38]
Minimum Preheat and Interpass Temperature
(°F [°C])
50 [10]
Consumables
AWS ER70S-X
Welding process
Welding process
Gas Metal Arc (GMAW)
Thickness
(in. [mm])
>1.50 – 2.00 [>38 – 50]
Minimum Preheat and Interpass Temperature
(°F [°C])
150 [65]
Consumables
AWS ER70S-X
Welding process
Welding process
Submerged Arc (SAW)
Thickness
(in. [mm])
≤3/4 [≤19]
Minimum Preheat and Interpass Temperature
(°F [°C])
50 [10]
Consumables
AWS F7XX-EXXX-XX
Welding process
Welding process
Submerged Arc (SAW)
Thickness
(in. [mm])
>3/4 – 1.5 [19 – 38]
Minimum Preheat and Interpass Temperature
(°F [°C])
50 [10]
Consumables
AWS F7XX-EXXX-XX
Welding process
Welding process
Submerged Arc (SAW)
Thickness
(in. [mm])
>1.50 – 2.00 [>38 – 50]
Minimum Preheat and Interpass Temperature
(°F [°C])
150 [65]
Consumables
AWS F7XX-EXXX-XX
Welding process
Welding process
Flux Cored Arc (FCAW)
Thickness
(in. [mm])
≤3/4 [≤19]
Minimum Preheat and Interpass Temperature
(°F [°C])
50 [10]
Consumables
AWS E7XTX-X
Welding process
Welding process
Flux Cored Arc (FCAW)
Thickness
(in. [mm])
>3/4 – 1.5 [19 – 38]
Minimum Preheat and Interpass Temperature
(°F [°C])
50 [10]
Consumables
AWS E7XTX-X
Welding process
Welding process
Flux Cored Arc (FCAW)
Thickness
(in. [mm])
>1.50 – 2.00 [>38 – 50]
Minimum Preheat and Interpass Temperature
(°F [°C])
150 [65]
Consumables
AWS E7XTX-X

Supplementary Requirements

By agreement between the purchaser and the plate manufacturer, the following Supplementary Agreements may be specified on the purchase order: S1. Vacuum Treatment; S2. Product Analysis; S3. Simulated Post-Weld Heat Treatment of Mechanical Test Coupons; S6. Drop Weight Test; S8. Ultrasonic Examination in accordance with A435; and S12. Ultrasonic Examination in accordance with ASTM A578.

Show specs in:

ImperialMetric