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ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater

    Buy cheap ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater from wholesalers
     
    Buy cheap ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater from wholesalers
    • Buy cheap ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater from wholesalers
    • Buy cheap ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater from wholesalers
    • Buy cheap ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater from wholesalers
    • Buy cheap ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater from wholesalers

    ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater

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    Brand Name : YUHONG
    Model Number : P11, 1 1/4Cr-1/2Mo
    Certification : ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
    Price : Negotiation
    Payment Terms : T/T, L/C at sight
    Supply Ability : 500 tons per month
    Delivery Time : 30 days
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    ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater

    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)​

    ElementComposition (% 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​

    PropertyValue
    ​​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​

    StandardGrade DesignationUNS NumberCommon Name
    ​​ASTM/ASME​​A335 Gr. P11K115971¼Cr-½Mo
    ​​EN​​13CrMo4-51.733513CrMo4-5
    ​​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 GradeCommon DesignationTypical Use in Fired HeatersWhy Used
    ​​Carbon Steel​​A106 Gr.B / A53Low-temp sections, economizersCost-effective for ≤ 425°C
    ​​1¼Cr-½Mo​​ASTM A335 P11Radiant/Convection sections (≤ 550°C)Creep resistance, weldability
    ​​2¼Cr-1Mo​​ASTM A335 P22High-temp radiant sections (≤ 575°C)Better creep strength than P11
    ​​9Cr-1Mo​​ASTM A335 P9Superheaters (≤ 650°C)Oxidation resistance
    ​​Alloy 800H/HT​​UNS N08810/11High-temp crackers (≤ 900°C)Carburization/oxidation resistance

    Radiant Section Components in Fired Heaters​

    ComponentFunction
    ​​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.


    Quality ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater for sale
    Company Info.
    Yuhong Group Co.,Ltd
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