ASTM A403 WP321H Elbow Tee Reducer ASME B16.9 Pipe Fittings Manufacturer
We are the reliable manufacturer and exporter of ASME SA403 WP321H stainless steel elbows, producing butt weld fittings according to ASME B16.9 standards.
Our WP321H elbows are made from high-carbon titanium-stabilized austenitic stainless steel, designed for superior performance in high-temperature and corrosive service environments.
“WP” stands for “wrought pipe,” and “321H” refers to the specific grade of stainless steel.
321H stainless steel is a higher carbon version (0.04–0.10% ) version of the of 321 stainless steel, which contains titanium to stabilize the material against chromium carbide precipitation, which can occur during welding and exposure to high temperatures. which makes 321H suitable for high-temperature applications
ASME SA403 WP321H fittings covered under ASTM A403 include elbows, tees, reducers, crosses, stub ends, caps, and bends
ASME SA403 WP321 & WP321H Equivalent Grade
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
ASME SA403 WP321 & WP321H Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
| SS321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
ASME SA403 WP321H Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
Fitting Classes for WP Grades
| CR | Corrosion resistant grade. S through WU Classes do not apply. |
| WP-S | Seamless |
| WP-W | Welded, RT or UT all pipe starting material welds made with filler metal. All fitting manufacturer welds except as excluded in A/SA403 paragraph 5.4.3. If UT is substituted for RT, all welds must be examined 100% for their length as required by A/SA403 paragraph 5.6 |
| WP-WX | RT all welds with or without filler metal. |
| WP-WU | UT all welds with or without filler metal. |
| WPgrade-grade-class | Insert grades (304-304L) and class (S,W,WX, or WU). Applies to fittings meeting all chemical and physical requirements of both grades. |
A403 WP321 / 321H Buttweld Pipe Fittings Size Range
Available Types of WP321H Elbows
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A403 WP321H 90° Long Radius Elbow (LR)
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A403 WP321H 45° Elbow
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A403 WP321H 180° Return Elbow
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A403 WP321H Short Radius Elbow (SR)
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Reducing Elbow
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Custom radius elbows on request
Size Range: ½” to 48” (DN15–DN1200)
Thickness: SCH 10S to SCH XXS
Standard: ASME B16.9 / MSS SP-43 / ASTM A403 / ASME SA403
How to order our ASME SA403 WP321H Elbow ?
ASME B16.9 ASTM A403 WP321H 90Deg LR Elbow 4 Inch Sch40S
