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ASTM A403 stainless steel pipe fittings
ASTM A403 stainless steel pipe fittings refers to forged and rolled austenitic stainless steel pipe fitting materials for pressure pipes. Common grades include WP304/L and WP316/L. They are used in the engineering industry, energy conversion plants and many other areas.
ASTM A403 standard scope
The standard covers multiple grades of austenitic stainless steel alloys and uses the WP or CR prefix to designate steel grades according to the applicable ASTM or MSS size and pressure class standards.
ASTM A403 is designed for forged steel pipe fittings, cast pipe fittings are not suitable. (Austenitic stainless steel castings are covered by these standards A351/A351M, A743/A743M, and A744/A744M.)
WP grade stainless steel pipe fittings
Materials under this standard are designated as WP grades, and for each WP grade of stainless steel, several categories of fittings are included to indicate seamless or welded construction. Class names are also used to indicate nondestructive testing methods and the scope of nondestructive testing (NDE).
• ASME B16.9: Factory Made Forged Steel Butt Weld Fittings
• ASME B16.11: Forged Steel Fittings, Socket Welds and Threads
ASTM A403 WP316 Stainless Steel Pipe Fittings
| Stainless Steel Pipe Fittings Type | Size | |
| ASTM A403 WP316 45° Elbow | ASTM A403 WP316 Tees | |
| ASTM A403 WP316 Reducing Elbow | ASTM A403 WP316 Reducing Cross | |
| ASTM A403 WP316L Concentric Reducer | ASTM A403 WP316 Pipe Nipple | |
| ASTM A403 WP316 Eccentric Reducer | ASTM A403 WP316 5D Elbow | |
| ASTM A403 WP316 Elbow – Long Radius | ASTM A403 WP316H Stub Ends | Sizes 1/2″ – 48″ |
| ASTM A403 WP316 Elbow – Short Radius | ASTM A403 WP316 Cross | |
| ASTM A403 WP316 Fabricated Tee | ASTM A403 WP316 End Cap | |
| ASTM A403 WP316L Reducer | ASTM A403 WP316 Coupling | |
| ASTM A403 WP316 3D Elbow | ASTM A403 WP316 Welded Pipe Fittings | |
UNS S31603 Buttweld Fittings Equivalent Grade Chart
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
|---|---|---|---|---|---|---|---|
| SS 316L | 1.4404 / 1.4435 | S31603 | SUS 316L | 316S11 / 316S13 | 03Ch17N14M3 / 03Ch17N14M2 | Z3CND17‐11‐02 / Z3CND18‐14‐03 | X2CrNiMo17-12-2 / X2CrNiMo18-14-3 |
ASTM A403 WP316L Stainless Steel Buttweld Fittings Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
|---|---|---|---|---|---|---|---|---|---|
| SS 316L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.00 – 18.00 | 2.00 – 3.00 | 10.00 – 14.00 | 68.89 min |
316L SS Pipe Fittings Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
|---|---|---|---|---|
| 8.0 g/cm3 | 1399 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
