Issuing body
ASTM
Latest edition
A403/A403M-23
Region
USA, Global
Equipment items
0
Scope
WP304/WP316 austenitic stainless butt-welding fittings.
Key requirements (7)
- Wrought austenitic stainless steel piping fittings.
- Grades: WP304, WP316, WP304L, WP316L, WP321, WP347 most common.
- Class types: WP-S (seamless), WP-W (welded with RT), WP-WX (welded), WP-WU (welded as-welded).
- Heat treatment: solution annealed.
- Used for elbows, tees, reducers, caps in stainless piping.
- Companion to A312 pipe and A182 flanges.
- Hydrotest by fitting manufacturer.