ASTM A537 Class 2
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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.
| Thickness (inmm) |
Width (inmm) |
Length (inmm) |
|---|---|---|
| 0.375 - 2.009.52 - 50.8 | 96 - 1202400 - 3050 | 240 - 5886100 - 14900 |
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 <96 inches down to 60 inches and for widths >120 inches up to 131.9 inches.
Length: Inquire for lengths <240 inches down to 73 inches.
Tensile testing is performed in the transverse direction according to ASTM A20 requirements. The required mechanical properties are tabulated below:
| Grade | Yield strength (min ksi) |
Tensile strength (ksi) |
Elongation in 2" (min %) |
|---|---|---|---|
| A537 Class 2 | 60 | 80 - 100 | 22 |
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.
(Heat Analysis, wt. %, maximum unless indicated)
Meets chemical requirements of ASTM A537 Class 2/ SA537 Class 2, as shown below. ASTM A20 limits apply to unspecified elements.
| C (max wt %) |
Mn 1) (max wt %) |
P 2) (max wt %) |
S 2) (max wt %) |
Si (max wt %) |
Cu (max wt %) |
Ni 1) (max wt %) |
Cr (max wt %) |
Mo (max wt %) |
|---|---|---|---|---|---|---|---|---|
| 0.24 | 1.60 | 0.020 | 0.010 | 0.50 | 0.35 | 0.25 | 0.25 | 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.
| Thickness (inmm) | 0.375 - 2.009.52 - 50.8 |
|---|---|
| Typical CET (wt %) | 0.33 |
| Typical CEV (wt %) | 0.45 |
Available Chemistries: Carbon equivalent (CEV) restrictions for weldability are available as a supplementary requirement (S20). Please inquire for additional chemistry restrictions.
Thickness, width, and length tolerances for A537 Class 2/ SA537 Class 2 are in accordance with ASTM A20 requirements. The flatness tolerance for as- supplied product is ½ ASTM A20.
ASTM A537 Class 2/ SA537 Class 2 is supplied in the quench and tempered condition.
A537 Class 2/ SA537 Class 2 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]) | Bend Axis Perpendicular to Rolling Direction Inside Radius, R (min.) | Bend Axis Perpendicular to Rolling Direction Die Width, W (min.) | Bend Axis Parallel to Rolling Direction Inside Radius, R (min.) | Bend Axis Parallel to Rolling Direction Die Width, W (min.) |
|---|---|---|---|---|
| 0.375 – 1.00 [9.5 – 25.4] | 1.5t | 8t | 2.25t | 10t |
| 1.00 – 2.00 [25.4 – 50.1] | 2.0t | 8t | 3.0t | 10t |
Welding of A537 Class 2/ SA537 Class 2 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 | Thickness(in. [mm]) | Minimum Preheat and Interpass Temperature (°F [°C]) | Consumables |
|---|---|---|---|
| Shielded Metal Arc (SMAW) | ≤3/4 [≤19] | 50 [10] | AWS E7015-X, E7016-X, E7018-X |
| Shielded Metal Arc (SMAW) | >3/4 – 1.5 [19 – 38] | 50 [10] | AWS E7015-X, E7016-X, E7018-X |
| Shielded Metal Arc (SMAW) | >1.50 – 2.00 [>38 – 50] | 150 [65] | AWS E7015-X, E7016-X, E7018-X |
| Gas Metal Arc (GMAW) | ≤3/4 [≤19] | 50 [10] | AWS ER70S-X |
| Gas Metal Arc (GMAW) | >3/4 – 1.5 [19 – 38] | 50 [10] | AWS ER70S-X |
| Gas Metal Arc (GMAW) | >1.50 – 2.00 [>38 – 50] | 150 [65] | AWS ER70S-X |
| Submerged Arc (SAW) | ≤3/4 [≤19] | 50 [10] | AWS F7XX-EXXX-XX |
| Submerged Arc (SAW) | >3/4 – 1.5 [19 – 38] | 50 [10] | AWS F7XX-EXXX-XX |
| Submerged Arc (SAW) | >1.50 – 2.00 [>38 – 50] | 150 [65] | AWS F7XX-EXXX-XX |
| Flux Cored Arc (FCAW) | ≤3/4 [≤19] | 50 [10] | AWS E7XTX-X |
| Flux Cored Arc (FCAW) | >3/4 – 1.5 [19 – 38] | 50 [10] | AWS E7XTX-X |
| Flux Cored Arc (FCAW) | >1.50 – 2.00 [>38 – 50] | 150 [65] | AWS E7XTX-X |
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; S8. Ultrasonic Examination in accordance with A435; and S12. Ultrasonic Examination in accordance with ASTM A578.