On this page 6 sections
What ASTM B366 covers
Standard at a glance
- Standard
- ASTM B366 / ASME SB366
- Issued by
- ASTM
- Product form
- Fittings
- Grades on site
- 8
Butt-weld and socket-weld fittings in nickel alloys, designated WP + alloy code (e.g. WPNCMC for 625, WPHC276).
Key requirements
- Made from seamless or welded products
- Heat treated
- Dimensions per ASME B16.9 / B16.11
- Radiography of welds for welded fittings (WX/WPW classes)
Summary for procurement guidance. Refer to the current edition of the standard for full requirements.
Grades supplied to ASTM B366
Ordering to ASTM B366
- State "ASTM B366" and the edition if your project requires it
- Grade / designation and product dimensions
- Supplementary requirements (tests, heat treatment, certification)
- Certificate type: EN 10204 3.1 or 3.2
Frequently asked questions
What does ASTM B366 cover?
Butt-weld and socket-weld fittings in nickel alloys, designated WP + alloy code (e.g. WPNCMC for 625, WPHC276).
Which grades are covered by ASTM B366?
On this site: Inconel 600, Inconel 625, Incoloy 800, Incoloy 825, Monel 400, Hastelloy C276, Hastelloy C22, Nickel 200.
Do you supply material certified to ASTM B366?
Yes. Material is supplied to ASTM B366 with EN 10204 3.1 certificates (3.2 on request), where the mill certifies to it.
Is ASME SAB366 the same as ASTM B366?
ASME adopts many ASTM material specifications into Section II with an "S" prefix (for example SA-366). The adopted text is identical or includes stated modifications, and dual-certified material meets both.