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

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

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

MOQ : 1000KG

Price : Negotiation

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

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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.

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


Product Tags:

GRADE P11 ALLOY STEEL SEAMLESS PIPE

      

ASTM A335 ALLOY STEEL SEAMLESS PIPE

      

Heater Radiant Alloy Steel Seamless Pipe

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

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

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