Import Alloy Steel Seamless Pipe — Buy in wholesale FOB from Supplier in China

Cangzhou Weiheng Pipe Industry Co., Ltd manufactures alloy steel seamless pipe to GB5310-2013 and ASTM A335, with grades P2, P5, P9, P11, P12, P22 and P91. Chrome-molybdenum compositions include 15CrMoG, 12Cr2MoG, 12CrMoG and 12Cr1MoVG, while carbon alloy options cover 20G and 25MnG. Outside diameter spans 6mm to 760mm with wall thickness from 1mm to 80mm, supplied in fixed lengths of 5.8m, 6m, 11.8m or 12m, or random length as required. The pipe is produced by hot rolling, cold drawing or cold rolling, with testing covering tensile, hardness, impact, bend, flattening, flaring and hydrostatic or nondestructive examination.

The GB5310-2013 standard governs seamless steel tubes for high-pressure boilers in China, with 15CrMoG containing approximately 0.12-0.18 percent carbon, 0.80-1.10 percent chromium and 0.40-0.55 percent molybdenum, offering a 440MPa minimum tensile strength at room temperature and design service up to 560 degrees Celsius. 12Cr1MoVG adds 0.15-0.30 percent vanadium for enhanced creep resistance, extending allowable stress at elevated temperature. ASTM A335 P91 (9Cr-1Mo-V-Nb-N) achieves 585MPa minimum tensile strength and is standard for ultra-supercritical boiler and heat-exchanger tubing where metal temperatures reach 600-650 degrees Celsius. Typical wall thickness tolerance for hot-finished seamless pipe is plus 12.5 percent, minus 12.5 percent to ASTM A530, while cold-drawn pipe achieves closer control at plus or minus 10 percent or better depending on specification class.

Power plant builders, petrochemical refineries, oil and gas pipeline contractors and industrial boiler manufacturers represent the core import market. The pipes serve superheater tubes, reheater tubes, steam lines, cracking coils and high-temperature process piping. Cangzhou Weiheng also offers complementary fittings including pipe caps, tees and bends, which simplifies procurement for fabricated piping systems. Buyers should confirm grade availability against their design code, whether EN 10216-2, DIN 17175, JIS G3458 or ASME standards are required, and specify the complete testing and certification package including third-party inspection if mandated by the project specification.

Cangzhou Weiheng Pipe Industry Co., Ltd is located in Wuliyao Development Zone, Yanshan County, Cangzhou City, Hebei Province, China, postal code 061300. The company holds a harbor trust tier on the platform, with a response rate of 0.00 percent and an average response time of 0 hours, indicating no verified response history is recorded. The listing presents an extensive standard and grade portfolio spanning Chinese, American, German, Japanese, French and British specifications, suggesting broad sourcing or manufacturing capability, though buyers should independently verify current production scope and quality system coverage for the specific grades required.

The company profile does not state year of establishment, employee count, annual turnover, named clients, factory floor area, number of production lines or specific certifications such as ISO 9001, API Q1 or ASME U/S stamps. Cangzhou is a recognized cluster for steel pipe and pipe fitting manufacturing in China, with numerous producers serving domestic power and petrochemical projects and export markets. The offering of complementary products (caps, tees, bends) indicates vertical integration or trading partnerships in the pipe fitting sector. Importers should request a factory audit, quality system certificate and reference list for projects supplied, particularly for P91 and other grades requiring stringent traceability and heat treatment control.