We have completed an export shipment of ASTM A312 TP347H seamless stainless steel pipe to a refinery and petrochemical complex in the Middle East. Specified for high-temperature, carburizing and sensitization-prone service, the material was supplied with full mill test certificates and third-party inspection to support the client's critical high-pressure, high-temperature (HPHT) piping runs.
Product Details
| Product | Stainless Steel Seamless Pipe |
| Material | ASTM A312 / ASME SA312 TP347H (UNS S34709) |
| Size | OD 60.3–168.3 mm (2″–6″), SCH 40S / 80S, Length 6 m |
| End-user | Refinery & petrochemical complex, Kuwait (Middle East) |
Export Details
| Item | Specification |
|---|---|
| Material grade | TP347H, UNS S34709 (niobium-stabilized austenitic) |
| Standard | ASTM A312 / ASME SA312, annealed & pickled |
| Quantity | 32 metric tons / 1,460 pieces |
| Size range | 2″ SCH 80S (60.3×5.54 mm) to 6″ SCH 40S (168.3×7.11 mm), 6 m random length |
| Chemistry (typical) | C 0.04–0.10, Cr 17.0–19.0%, Ni 9.0–13.0%, Nb+Ta ≥ 8×C (≤1.00%) |
| Mechanical (annealed) | Tensile ≥ 515 MPa (75 ksi), Yield ≥ 205 MPa (30 ksi), Elongation ≥ 35% |
| Inspection & test | PMI, UT, hydrostatic test, IGC per ASTM A262 Practice E; EN 10204 3.1 MTC |
| Third-party | SGS / BV witness available on request |
| Packaging | Wooden cases, plastic end caps, rust-preventive oil, seaworthy export marking |
| Destination | Shuwaikh / Shuaiba port, Kuwait (CIF) |
| Lead time | 35 days from order confirmation |
Why TP347H for this project?
Niobium (Nb) stabilization prevents chromium-carbide precipitation at 425–850 °C, so the pipe resists intergranular corrosion in the heat-affected zone without post-weld heat treatment.
Higher carbon (0.04–0.10%) gives TP347H superior creep and high-temperature strength versus 304H/316L in HPHT refinery and furnace service (continuous use up to ~800 °C).
Excellent resistance to oxidation and carburization in catalytic reforming, hydrotreating and pyrolysis lines.
Seamless integrity - no longitudinal weld, ideal for cyclic thermal stress and high-pressure boiler/transfer lines.
