ASTM A387
Chrome-moly alloy steel pressure-vessel plate
Covers chrome-molybdenum alloy steel pressure-vessel plate for elevated-temperature service, in grades such as 11, 12, 22 and 91, in Class 1 or Class 2 (Grade 91 in Class 2 only).
- Plate, sheet & strip
- ASME SA-387
- 1 grade in stock range
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What to know before ordering to ASTM A387
The points that decide whether material to ASTM A387 is accepted at inspection.
- Class 2 has higher tensile and yield strength than Class 1 of the same grade.
- Grade 11 (1¼Cr-½Mo) and Grade 22 (2¼Cr-1Mo) are the most common.
- Plates are supplied normalised and tempered or quenched and tempered.
Grades and products we supply to ASTM A387
| Grade | Product | Designation on the certificate |
|---|---|---|
| SA-387 Gr 11 Cl 2 | Plate | ASTM A387 Gr 11 Cl 2 · ASME SA-387 |
Products made to ASTM A387
How ASTM A387 fits into an order
A purchase order line is only complete when it names the material standard, the dimensional standard and the inspection document. Miss one and the mill, the inspector and the buyer can each read the order differently.
Related standards
ASTM A387 — questions buyers ask
What does ASTM A387 cover?
Covers chrome-molybdenum alloy steel pressure-vessel plate for elevated-temperature service, in grades such as 11, 12, 22 and 91, in Class 1 or Class 2 (Grade 91 in Class 2 only).
Which grades do you supply to ASTM A387?
SA-387 Gr 11 Cl 2 — see the table on this page for the exact product and designation.
What is the difference between ASTM A387 and ASME SA-387?
ASME SA-387 is the ASME Boiler and Pressure Vessel Code (Section II) adoption of ASTM A387. The technical requirements are usually identical to a specific ASTM edition; pressure-equipment codes call for the ASME designation, and most mill certificates show both.
Do you supply certificates to this standard?
Yes. Material is supplied with mill test certificates to EN 10204 3.1 showing the standard, grade and heat number; 3.2 with third-party inspection on request.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026