ASTM A312
Seamless, welded and cold-worked austenitic stainless steel pipe
The main specification for seamless, straight-seam welded and heavily cold-worked welded austenitic stainless steel pipe for high-temperature and general corrosive service.
- Pipe & tube
- ASME SA-312
- 7 grades in stock range
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What to know before ordering to ASTM A312
The points that decide whether material to ASTM A312 is accepted at inspection.
- Sizes and wall thicknesses follow ASME B36.19 (schedules 5S, 10S, 40S, 80S) or B36.10.
- The order must say seamless or welded; both are covered but priced differently.
- Duplex pipe is not in A312 — it is ordered to ASTM A790.
Grades and products we supply to ASTM A312
| Grade | Product | Designation on the certificate |
|---|---|---|
| SS 904L | Pipe & Tube | ASTM A312 (N08904) |
| SS 304 | Pipe & Tube | ASTM A312 TP304 |
| SS 304 | Pipe & Tube | ASTM A312 · A358 |
| SS 304L | Pipe & Tube | ASTM A312 TP304L |
| SS 304L | Pipe & Tube | ASTM A312 · A358 |
| SS 310 / 310S | Pipe & Tube | ASTM A312 TP310S |
| SS 310 / 310S | Pipe & Tube | ASTM A312 · A358 |
| SS 316 / 316L | Pipe & Tube | ASTM A312 TP316L |
| SS 316 / 316L | Pipe & Tube | ASTM A312 · A358 |
| SS 321 | Pipe & Tube | ASTM A312 TP321 |
| SS 321 | Pipe & Tube | ASTM A312 · A358 |
| SS 347 | Pipe & Tube | ASTM A312 TP347 |
| SS 347 | Pipe & Tube | ASTM A312 · A358 |
How ASTM A312 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 A312 — questions buyers ask
What does ASTM A312 cover?
The main specification for seamless, straight-seam welded and heavily cold-worked welded austenitic stainless steel pipe for high-temperature and general corrosive service.
Which grades do you supply to ASTM A312?
SS 904L, SS 304, SS 304L, SS 310 / 310S, SS 316 / 316L, SS 321, SS 347 — see the table on this page for the exact product and designation.
What is the difference between ASTM A312 and ASME SA-312?
ASME SA-312 is the ASME Boiler and Pressure Vessel Code (Section II) adoption of ASTM A312. 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