Import Astm A335/ Asme Sa335 P91 Seamless Steel — Buy in wholesale FOB from Supplier in China

Astm A335/ Asme Sa335 P91 seamless steel pipe is a creep-strength enhanced ferritic alloy steel designed for high-temperature service in power generation and petrochemical plants. The source listing specifies outside diameters from 1/2 inch to 48 inches across Schedules 10 through 160, plus STD, XS and XXS wall thicknesses, with non-standard dimensions available on request. Manufacture covers both hot-finished and cold-drawn methods, and length options include fixed or random configurations to suit project requirements.

The P91 grade contains 9% chromium and 1% molybdenum with controlled additions of vanadium and niobium, providing enhanced creep rupture strength compared to lower alloy grades such as P11 or P22. Typical chromium content ranges from 8.00% to 9.50%, molybdenum from 0.85% to 1.05%, and carbon from 0.08% to 0.12%, balanced with manganese, silicon and restricted sulphur and phosphorus levels. This composition forms a stable martensitic microstructure after normalising and tempering, delivering oxidation resistance up to 650 degrees Celsius under sustained load conditions. Wall thickness tolerance for seamless pipe typically follows ASTM A530 standards, with +/- 12.5% on nominal wall for schedules above XS.

Power plant contractors and oilfield engineering firms purchase P91 seamless pipe for main steam lines, reheater tubing and high-pressure headers where ASME compliance is mandatory. The large diameter range up to 48 inches suits both boiler fabrication and pipeline construction, while the schedule breadth accommodates varying pressure classes. Buyers should confirm mill test certificates, third-party inspection protocols and specific heat treatment records with Xi'an Overseas Oilfield Services Co., Ltd., as response rate data is currently unavailable.

Xi'an Overseas Oilfield Services Co., Ltd. is located at No.35, Tangyan Road, High-Tech Zone, Xian, Shaanxi, 710075, China. The company operates under a harbor trust tier classification. The response rate is recorded as 0.00% with average response hours at zero, which indicates no response data is currently available through this channel.

The listing presents this supplier as offering ASTM A335/ASME SA335 P91 seamless steel with substantial size flexibility, including non-standard dimensions. No information is provided about year of establishment, production capacity, workforce size, revenue figures, specific client references, or third-party certifications. Buyers should verify manufacturing credentials, quality management system certification and inspection capabilities directly with the supplier before committing to orders.