Name: ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater
Brand: Yuhong Group Co.,Ltd
SKU: P11, 1 1/4Cr-1/2Mo
Price: 1000000.00 USD
Availability: InStock

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

Product Details:

Place of Origin:	CHINA
Brand Name:	YUHONG
Certification:	ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number:	P11, 1 1/4Cr-1/2Mo

Payment & Shipping Terms:

Minimum Order Quantity:	1000KG
Price:	Negotiation
Packaging Details:	According to client requirements/wooden case packing
Delivery Time:	30 days
Payment Terms:	T/T, L/C at sight
Supply Ability:	500 tons per month

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Detailed Product Description

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
Highlight:	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.

ASTM A335 Grade 1¼Cr-½Mo P11 Alloy Steel Seamless Pipe for API Standard 560 Fired Heater 0