YUHONG HOLDING GROUP CO., LTD
| Payment Terms | L/C,T/T |
| Supply Ability | Accdording to customer's request |
| Delivery Time | Depends on quantity |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| Product Name | Seamless Alloy-Steel Pipe |
| Specification | ASTM A335/ ASME SA335 |
| Material | P11 |
| W.T. | MW/ AW |
| Type | Seamless |
| Surface | Bright Annealed, Pickled And Annealed, Polished |
| Ends | Plain End, Beveled End |
| Application | Boiler, Superheater, Heat Exchanger |
| Brand Name | YUHONG |
| Model Number | ASTM A335 P11(UNS K11597) |
| Certification | ABS, LR, GL, DNV, NK, TS, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 |
| Place of Origin | China |
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Product Specification
| Payment Terms | L/C,T/T | Supply Ability | Accdording to customer's request |
| Delivery Time | Depends on quantity | Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| Product Name | Seamless Alloy-Steel Pipe | Specification | ASTM A335/ ASME SA335 |
| Material | P11 | W.T. | MW/ AW |
| Type | Seamless | Surface | Bright Annealed, Pickled And Annealed, Polished |
| Ends | Plain End, Beveled End | Application | Boiler, Superheater, Heat Exchanger |
| Brand Name | YUHONG | Model Number | ASTM A335 P11(UNS K11597) |
| Certification | ABS, LR, GL, DNV, NK, TS, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 | Place of Origin | China |
| High Light | ASTM A335 P11 alloy steel pipe ，seamless ferritic boiler tube ，high-temperature service alloy pipe | ||
ASTM A335 P11 Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P11 is a seamless ferritic alloy-steel pipe within the chromium-molybdenum (Cr-Mo) system, engineered for high-temperature/pressure service. Its microstructure consists of tempered bainite or ferrite-pearlite (depending on heat treatment), where the controlled alloying of Cr (1.00-1.50%) and Mo (0.44-0.65%) ensures superior creep resistance and rupture strength within the 540-593°C range. Manufactured via seamless hot-finished or cold-drawn processes, the pipe requires normalization and tempering to enhance grain boundary stability. It is certified for ASME B31.1/B31.3-regulated power piping and high-temperature refinery/petrochemical pipelines.
1.Chemical & Mechanical Properties
| ASTM A335 P11 Chemical Composition (%) | ||||||
| C | Mn | P | S | Si | Cr | Mo |
|
0.05%~0.15% |
0.3%~0.6% | ≤0.025% |
≤0.025% |
0.5%-1.00% |
1.00%~1.5% |
0.44%~0.65% |
Mechanical Properties
| Property | Standard Value |
|---|---|
| Tensile Strength | ≥415 MPa (60 ksi) |
| Yield Strength (0.2% offset) | ≥205 MPa (30 ksi) |
| Elongation | ≥20% |
| Hardness (Brinell) | ≤197 HBW |
2. Key Adventages
Maintains excellent creep resistance at 540-593°C, with 2-3 times longer service life than carbon steel (e.g. A106)
Maintains rupture strength >60MPa under 593°C/100,000h condition
1.25% Cr content forms dense Cr₂O₃ scale, reducing oxidation rate by 80% vs carbon steel
15-20% cost saving vs P22, most economical choice for <600°C service
Excellent high-temp stability extends maintenance intervals by 50% vs carbon steel
Standard PWHT(650-750°C) is sufficient, much simpler than high-alloy steels
Supports both hot bending(>950°C) and cold bending(annealing required)
Normalizing+Tempering creates stable ferrite+pearlite structure
Complies with both ASME BPV Code and ASTM A335 standards
3. Key Applications
Power Industry: Power plant boilers (superheaters, reheaters, main steam pipelines)
| Characteristic | ASTM A335 P11 | Carbon Steel (A106) | High-Alloy Steel (P91) |
| Max Service Temp | 593°C | 425°C | 700°C |
| High-Temp Strength | ★★★★☆ | ★★☆☆☆ | ★★★★★ |
| Cost Efficiency | ★★★★★ | ★★★★☆ | ★★★☆☆ |
| Fabrication Difficulty | ★★☆☆☆ | ★☆☆☆☆ | ★★★★☆ |
| Maintenance Interval | 3-5 years | 1-2 years | 5-8 years |
Company Details
Business Type:
Manufacturer,Importer,Exporter,Trading Company,Seller,Other
Year Established:
1990
Total Annual:
50M-70M
Employee Number:
50~800
Ecer Certification：
Verified Supplier
Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n... Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n...
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