ASTM A234 WP9 Buttweld Fittings are made to ASTM A234 / ASME SA234 WP9 for high-temperature refinery service. Elbows, tees, reducers and caps are dimensioned to ASME B16.9 and bevelled for welding into ASTM A182 F9 pipe.
Raaj Fittings manufactures ASTM A182 F9 buttweld fittings in-house at our two plants in India, seamless and welded, from ½" upwards, and exports them to EPC contractors, fabricators and stockists across the Middle East, Europe and the Americas, with full traceability and EN 10204 certificates.
| Material specification | ASTM A234 / ASME SA234 WP9 |
|---|---|
| Construction | Seamless and welded |
| Dimensional standards | ASME B16.9; bevelled ends to ASME B16.25 |
| Size range | ½" to 48" NPS; larger sizes to order |
| Wall thickness | SCH 10 to SCH 160, STD, XS, XXS, or to the pipe wall thickness |
| Certification | EN 10204 3.1 mill test certificate as standard; EN 10204 3.2 on request |
ASTM A182 F9 is a 9% chromium, 1% molybdenum alloy steel. The higher chromium gives better resistance to high-temperature sulphidation and oxidation than 5Cr, for refinery and petrochemical service at the upper end of the chrome-moly range.
| Element, % | ASTM A182 F9 |
|---|---|
| Carbon (C) | 0.15 max |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | 0.030 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 8.0 – 10.0 |
| Nickel (Ni) | — |
| Molybdenum (Mo) | 0.90 – 1.10 |
| Property | ASTM A182 F9 |
|---|---|
| Tensile strength, min. | 585 MPa (85 ksi) |
| UNS | Werkstoff Nr. | EN / DIN | Other |
|---|---|---|---|
| K90941 | 1.7386 | X11CrMo9-1 (comparable) | — |
Chrome-moly fittings are heat treated after forming to restore properties, and hardness is checked. Field welds need preheat and post-weld heat treatment to the piping code, and hardness testing after PWHT is common practice.
Every heat is PMI-verified and its chemistry and mechanical properties are confirmed against the material specification before the buttweld fittings are released. Each piece is marked with grade, size, rating and heat number for traceability to its EN 10204 3.1 mill test certificate. EN 10204 3.2 certification and inspection by the buyer's nominated third-party agency are available on request, as are PED 2014/68/EU compliance for European projects and IBR certification for Indian boiler applications.
Heat treatment records and hardness results are reported for each heat.
Both have about 9% chromium and 1% molybdenum, but F91 is "modified" with vanadium, niobium and nitrogen, which gives it far higher creep strength. F9 is common in refineries; F91 in power plants.
Yes. Smaller sizes are normally seamless and larger sizes welded, with weld examination as the specification and your order require. Tell us the size, schedule and any construction requirement.
Every order is supplied with EN 10204 3.1 mill test certificates showing heat chemistry and mechanical properties to ASTM A234 WP9. EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.