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 HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9... YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9...
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