ASTM A335 P11 Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
Brand Name:YUHONG
Certification:ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number:ASTM A335 P11(UNS K11597)
Minimum Order Quantity:100KGS
Delivery Time:10-15 DAYS
Payment Terms:L/C,T/T
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- YUHONG brand goods have been already exported to more than 85 countries With more than 35 years' experience, because of strict quality control policy, excellent sales service, delivery on time. YUHONG won more and more new clients and got more and more repeat orders from old clients, in YUHONG People's mind: Quality is First Important!
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
- High-Temperature Performance Advantages
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
- Cost-Effectiveness Advantages
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
Fabrication Advantages
Standard PWHT(650-750°C) is sufficient, much simpler than high-alloy steels
Supports both hot bending(>950°C) and cold bending(annealing required)
Reliability Advantages
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)
- Petrochemical Industry: Refinery hydrogenation units, cracking equipment pipelines
- Natural Gas Transmission: High-pressure natural gas gathering pipelines
- Industrial Boilers: High-pressure boiler heat exchangers, economizers, headers
- Chemical Processing: High-temperature reactors, heat exchanger tubing
| 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 |
ASTM A335 P11 Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
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