ASTM B366
Factory-made wrought nickel and nickel-alloy fittings
Covers factory-made wrought nickel and nickel-alloy fittings — elbows, tees, reducers, caps and stub ends — with grade designations such as WPNICMC (825), WPNCMC (625), WPHC276 and WPNC (Monel 400).
- Pipe fittings
- ASME SB-366
- 7 grades in stock range
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What to know before ordering to ASTM B366
The points that decide whether material to ASTM B366 is accepted at inspection.
- The grade name tells you the alloy: WPNICMC is Alloy 825.
- Fittings are made from pipe, plate or bar to the matching nickel-alloy product specification.
- Dimensions follow ASME B16.9 or MSS SP-43.
Grades and products we supply to ASTM B366
| Grade | Product | Designation on the certificate |
|---|---|---|
| Inconel 825 | Fittings | ASTM B366 WPNICMC |
| Inconel 600 | Fittings | ASTM B366 WPNCI |
| Inconel 625 | Fittings | ASTM B366 WPNCMC |
| Incoloy 800 / 800H / 800HT | Fittings | ASTM B366 WPNIC |
| Hastelloy C276 | Fittings | ASTM B366 WPHC276 |
| Hastelloy C22 | Fittings | ASTM B366 WPHC22 |
| Monel 400 | Fittings | ASTM B366 WPNC |
How ASTM B366 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 B366 — questions buyers ask
What does ASTM B366 cover?
Covers factory-made wrought nickel and nickel-alloy fittings — elbows, tees, reducers, caps and stub ends — with grade designations such as WPNICMC (825), WPNCMC (625), WPHC276 and WPNC (Monel 400).
Which grades do you supply to ASTM B366?
Inconel 825, Inconel 600, Inconel 625, Incoloy 800 / 800H / 800HT, Hastelloy C276, Hastelloy C22, Monel 400 — see the table on this page for the exact product and designation.
What is the difference between ASTM B366 and ASME SB-366?
ASME SB-366 is the ASME Boiler and Pressure Vessel Code (Section II) adoption of ASTM B366. 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