Yuhong Group Co.,Ltd
| Payment Terms | T/T, L/C at sight |
| Supply Ability | 500 tons per month |
| Packaging Details | According to client requirements/wooden case packing |
| Delivery Time | 30 days |
| Standard | ASTM A335 |
| Material Grade | P11, 1 1/4Cr-1/2Mo |
| Nondestructive Examination | Practice E213, Practice E309, Practice E570 |
| Mechanical Test | Transverse Test, Longitudinal Tension Test, Hardness Test, Flattening Test, Bend Test |
| Application | Oil refinery |
| Application equipment | API Standard 560 Fired Heater |
| Application section | Radiant section |
| Brand Name | YUHONG |
| Model Number | P11, 1 1/4Cr-1/2Mo |
| 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 | T/T, L/C at sight | Supply Ability | 500 tons per month |
| Packaging Details | According to client requirements/wooden case packing | Delivery Time | 30 days |
| Standard | ASTM A335 | Material Grade | P11, 1 1/4Cr-1/2Mo |
| Nondestructive Examination | Practice E213, Practice E309, Practice E570 | Mechanical Test | Transverse Test, Longitudinal Tension Test, Hardness Test, Flattening Test, Bend Test |
| Application | Oil refinery | Application equipment | API Standard 560 Fired Heater |
| Application section | Radiant section | Brand Name | YUHONG |
| Model Number | P11, 1 1/4Cr-1/2Mo | Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Place of Origin | CHINA | ||
| High Light | GRADE P11 ALLOY STEEL SEAMLESS PIPE ，ASTM A335 ALLOY STEEL SEAMLESS PIPE ，Heater Radiant Alloy Steel Seamless Pipe | ||
ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater
ASTM A335 Grade P11 (1¼Cr-½Mo) seamless pipes deliver exceptional high-temperature creep resistance and oxidation stability in fired heaters. Engineered for API 560 compliance, these pipes ensure reliable performance in radiant/convection sections up to 550°C. Ideal for hydrocarbon processing, they combine weldability, stress tolerance, and cost efficiency for critical heater tube service.
Chemical Composition of ASTM A335 Grade P11 (1¼Cr-½Mo)
| Element | Composition (% Weight) |
|---|---|
| Carbon (C) | 0.05–0.15 |
| Manganese (Mn) | 0.30–0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.50–1.00 |
| Chromium (Cr) | 1.00–1.50 |
| Molybdenum (Mo) | 0.44–0.65 |
| Notes | Residuals (Cu, Ni, etc.) ≤ 0.50% combined |
Mechanical Properties of ASTM A335 P11
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa (60 ksi) |
| Yield Strength | ≥ 205 MPa (30 ksi) |
| Elongation (50mm Gauge) | ≥ 30% (varies with wall thickness) |
| Hardness (Max) | 197 HBW / 207 HV |
| Impact Test | Charpy V-notch ≥ 20J @ 20°C (Optional per spec) |
| Notes | Properties apply after heat treatment (normalize + temper) |
Equivalent Grades of P11 Across Standards
| Standard | Grade Designation | UNS Number | Common Name |
|---|---|---|---|
| ASTM/ASME | A335 Gr. P11 | K11597 | 1¼Cr-½Mo |
| EN | 13CrMo4-5 | 1.7335 | 13CrMo4-5 |
| ISO | CrMo 1 1/4 1/2 | - | - |
| JIS | STPA 25 | - | Chrome-Moly Pipe |
| Notes | UNS K11597 is the universal cross-standard identifier |
Common Alloy Tubes in Fired Heaters
| Alloy Grade | Common Designation | Typical Use in Fired Heaters | Why Used |
|---|---|---|---|
| Carbon Steel | A106 Gr.B / A53 | Low-temp sections, economizers | Cost-effective for ≤ 425°C |
| 1¼Cr-½Mo | ASTM A335 P11 | Radiant/Convection sections (≤ 550°C) | Creep resistance, weldability |
| 2¼Cr-1Mo | ASTM A335 P22 | High-temp radiant sections (≤ 575°C) | Better creep strength than P11 |
| 9Cr-1Mo | ASTM A335 P9 | Superheaters (≤ 650°C) | Oxidation resistance |
| Alloy 800H/HT | UNS N08810/11 | High-temp crackers (≤ 900°C) | Carburization/oxidation resistance |
Radiant Section Components in Fired Heaters
| Component | Function |
|---|---|
| Radiant Tubes | Contain process fluid; absorb direct flame radiation |
| Burners | Generate flames to heat tubes |
| Refractory Lining | Insulates walls/floor, reflects heat toward tubes |
| Tube Supports | Hold tubes in position (e.g., guides, hangers) |
| Shock/Sight Doors | Allow visual inspection and emergency access |
| Header Pipes | Distribute fluid to/from tube banks |
| Crossover Piping | Connect radiant/convection sections |
| Steel Casing | Structural enclosure containing insulation |
| Stack/Damper | Flue gas exit path with draft control (connects to convection section) |
For API 560 fired heaters, ASTM A335 P11 seamless pipes provide a proven solution for demanding radiant/convection environments. Their balanced chromium-molybdenum chemistry offers superior strength, thermal stability, and corrosion resistance. Optimized for longevity and safety in refineries/petrochemical units, P11 pipes are a cost-effective choice for sustained high-temp operation.
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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