This specification covers five grades of as-welded, wrought austenitic stainless steel fittings for low-pressure piping and intended for low and moderate temperatures and general corrosive service. For applications requiring a product that requires heat treatment or full pressure rating, refer to Specification A403/ A403M. The term “fittings” applies to butt and socket welding parts such as 45° and 90° elbows, tees, reducers, wyes, laterals, crosses, and stub ends. This specification covers as-welded fittings 3 through 48 in. [75 through 1225 mm] in outside diameter and in nominal wall thicknesses 0.062 through 0.500 in. [1.6 through 12.7 mm].
| Grades | UNS Designation |
|---|---|
| TP 304L | S30403 |
| TP 316L | S31603 |
| TP 317L | S31703 |
| TP 321 | S32100 |
| TP 347 | S34700 |