Yuhong Group Co.,Ltd
| Payment Terms | L/C,T/T |
| Delivery Time | 7 DAYS |
| Packaging Details | BUNDLE, PLYWOOD CASE |
| Product Name | Alloy Steel Seamless Pipe |
| Standard | ASTM A335 / ASME SA335 |
| Material | Gr. P5, P9, P11, P12, P21, P22 , P91 |
| O.D. | 1/2" TO 24 " or large |
| Length | Single Random, Double Random & Cut Length |
| Thickness | SCH.5S- SCH.XXS |
| End | Plain End, Beveled End |
| High Light | ASTM A335 P9 Alloy Steel Seamless Pipe |
| Brand Name | YUHONG |
| Model Number | ASTM A335 P9 Alloy Steel Seamless Pipe |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | L/C,T/T | Delivery Time | 7 DAYS |
| Packaging Details | BUNDLE, PLYWOOD CASE | Product Name | Alloy Steel Seamless Pipe |
| Standard | ASTM A335 / ASME SA335 | Material | Gr. P5, P9, P11, P12, P21, P22 , P91 |
| O.D. | 1/2" TO 24 " or large | Length | Single Random, Double Random & Cut Length |
| Thickness | SCH.5S- SCH.XXS | End | Plain End, Beveled End |
| High Light | ASTM A335 P9 Alloy Steel Seamless Pipe | Brand Name | YUHONG |
| Model Number | ASTM A335 P9 Alloy Steel Seamless Pipe | Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Place of Origin | CHINA | ||
| High Light | Cr-Mo Alloy Steel Seamless Pipe ，ASTM A335 Seamless Alloy Pipe ，UNS S50400 Seamless Alloy Steel Pipe | ||
ASTM A335 / ASME SA335 Grade P9 / UNS S50400 Alloy Steel Seamless Pipe Black Painted
ASTM A335 P9 is a seamless, chromium-molybdenum alloy steel pipe designed for high-temperature and high-pressure applications. With 8–10% chromium and 0.9–1.1% molybdenum, it offers exceptional resistance to oxidation, creep, and thermal stress at temperatures up to 650°C (1,200°F). It is widely used in critical environments like power plant steam lines, oil refineries, petrochemical processing, and boiler systems where long-term reliability under extreme conditions is essential. P9 requires specialized welding/preheat treatment but outperforms lower-grade alloys in demanding industrial settings.
Equivalent Material of ASTM A335/ASME SA335 Alloy Steel Seamless Pipe
| UNS | ASTM | EN | DIN | JIS | GB |
| K50400 | P9 | 12Cr9Mo | X12CrMo91 | STBA26 | / |
Chemical composition(%) of ASTM A335/ASME SA335 Alloy Steel Seamless Pipe
| Grade | C | Mn | P≤ | S≤ | Si≤ | Cr | Mo |
| P11 | .05-0.15 | 0.30-0.60 | 0.025 | 0.025 | .50-1.00 | 1.00-1.50 | .44-0.65 |
| P22 | .05-0.16 | 0.30-0.60 | 0.025 | 0.025 | ≤0.50 | 1.90-2.60 | .87-1.13 |
| P5 | ≤0.15 | 0.30-0.60 | 0.025 | 0.025 | ≤0.50 | 4.00-6.00 | .45-0.65 |
| P9 | ≤0.15 | 0.30-0.60 | 0.025 | 0.025 | .25-1.00 | 8.00-10.00 | .90-1.10 |
| P91 | 0.08-0.12 | 0.30-0.60 | 0.020/0.010 | 0.020/0.010 | .02-0.50 | 8.00-9.50 | .85-1.05 |
| P92 | 0.07-0.13 | 0.30-0.60 | 0.020/0.010 | 0.020/0.010 | ≤0.50 | 8.50-9.50 | .30-0.60 |
Advantages:
Superior creep strength under sustained high temps.
Oxidation/sulfidation resistance (due to Cr content).
Good weldability (requires pre/post-weld heat treatment).
Mechanical Property of ASTM A335/ASME SA335 Alloy Steel Seamless Pipe
| Steel Grade | Tensile Strength, Mpa | Yield Strength, Mpa | Elongation, % |
| P5 | Min: 415 | Min: 205 | Min: 30 |
| P9 | Min: 415 | Min: 205 | Min: 30 |
| P11 | Min: 415 | Min: 205 | Min: 30 |
| P12 | Min: 415 | Min: 205 | Min: 30 |
| P22 | Min: 415 | Min: 205 | Min: 30 |
| P91 | Min: 415 | Min: 415 | Min: 20 |
Application
Power Plants: Superheaters, reheaters, high-temp steam lines.
Oil & Gas: Refinery piping, catalytic cracker units, hydrogen service.
Petrochemical: High-pressure/temperature process pipelines.
Boilers: Critical pressure parts in fossil-fuel boilers.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou... Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
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