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What is ASTM A403 WP304 Stainless Steel Pipe Fittings?
A403 304 Stainless Steel covers the standard for wrought austenitic stainless steel fittings for pressure piping applications. The material for fittings shall consist of stainless steel forgings, stainless steel bars, stainless steel plates, or seamless or welded stainless steel tubular products. Stainless Steel forging or shaping operations shall be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining, or by a combination of two or more of these operations.
All ASTM A403 WP304 Stainless Steel Pipe Fittings shall undergo heat-treatment. Chemical and product analyses shall be performed and shall conform to the required chemical composition in carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, and titanium.
| A403 304 Stainless Steel Pipe Fittings Specification | ||||
|---|---|---|---|---|
| A403 304 Stainless Steel Buttweld (B/W) Fittings Material | Size (in mm) | Sch. & Swg. | SS Fittings Specification | SS Pipe Fittings Items |
| A403 304 Stainless Steel Seamless Fittings | 15 NB to 300 NB | Sch. 5 to Sch. Xxs | A-403 B/W ANSI B16.9 | A403 WP304 Bend (Long & Short) |
| R=2D,3D,5D,10D Etc | ||||
| A403 WP304 Elbow ( 180o, 90o & 45o) | ||||
| A403 WP304 Tee (Equal & Unequal) | ||||
| A403 304 Stainless Steel Welded [ERW] Fittings | 15 NB to 600 NB | Sch. 5 to Sch. 80S | A-403 B/W ANSI B16.9 | A403 WP304 Reducer (Con & Ecc) CAP |
| A403 WP304 Stubend (Long & Short) | ||||
| A403 WP304 Nipple (Barrel) | ||||
| STAINLESS STEEL [SS] 304 / H / L / N / LN | |
|---|---|
| AISI | 304 / 304H / 304L / 304N / 304LN |
| UNS | S30400 / S30409 / S30403 / S30451 / S30453 |
| Werkstoff Nr. | 1.4301 / 1.4306 / 1.4948 / 1.4311 |
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 304 | S30400 | 304S31 | 58E | 1.4301 | X5CrNi18-10 | 2332 | SUS 304 |
| 304L | S30403 | 304S11 | - | 1.4306 | X2CrNi19-11 | 2352 | SUS 304L |
| 304H | S30409 | 304S51 | - | 1.4948 | X6CrNi18-11 | - | - |
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.
| Specification | ASTM A182 / A403 & ASME SA182 / SA403 |
|---|---|
| Grades | 201, 202, 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316TI, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H, 904L |
| Type | Seamless / Welded / Fabricated |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
| Range | ½”NB to 48″NB in Sch 10s, 40s, 80s, 160s, XXS. |
| Dimensions | ANSI/ASME B16.9, B16.28, MSS-SP-43. |
Stainless Steel Pipe/Tube Fittings Manufacturing Standards
| Grade | Specification |
|---|---|
| Stainless 304/304L, 304/304H | A/SA403, A/SA182 |
| Stainless 316/316L, 316/316H | A/SA403, A/SA182 |
| Stainless 317/317L | A/SA403, A/SA182 |
| Stainless 321/321H | A/SA403, A/SA182 |
| Stainless 347/347H | A/SA403, A/SA182 |
| Standard | Description |
|---|---|
| ASTM A182/A182M | Forged or rolled alloy steel pipe flanges, forged fittings and valves and parts for high temperature service. Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings |
| ASTM A403/A403M | Wrought austenitic stainless steel piping fittings. |
| ASTM A815/A815M | Wrought ferritic, ferritic/austenitic and martensitic stainless steel piping fittings. |
| AS 2129 | Flanges for pipes, valves and fittings |
| ANSI/ASME B1.20.1 | Pipe threads, general purpose (inch). |
| ANSI B16.5 | Steel pipe flanges and flanged fittings. |
| ANSI B16.9 | Factory-made wrought steel butt-welding fittings. |
| ANSI B16.11 | Forged steel fittings socket-welding and threaded. Socket Welding and Threaded Forged Fittings |
| ANSI B16.25 | Butt-welding ends. |
| MSS SP43 | Wrought stainless steel butt-welding fittings. Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications |
| BS21 | Threading. |
| ISO 4144 | Stainless steel fittings threaded to ISO 7-1. |
| MSS SP-95 | Swage(d) Nipples and Bull Plugs |
| BS3799 | Specification for Steel pipe fittings, screwed and Socket-welding for the petroleum industry |
| ANSI – B 16.9 ASTM A403 – ASME SA403 | ‘Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings’ |
| API 590-605 ASME B16.9 | ‘Factory-Made Wrought Buttwelding Fittings’ |
| ASME B16.25 | ‘Buttwelding Ends’ |
| ASME B16.28 | ‘Wrought Steel Buttwelding Short Radius Elbows and Returns’ |
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