ASTM A335 P11 Pipe

ASTM A335 P11 Pipe Specifications

ASTM A335 P11 pipe specifications, including standard, type, dimensions, finishes, and more are covered in the table below.

ASTM A335 P11 Pipe Sizes & Dimensions

The table below provides common sizes with corresponding outer diameter and wall thickness values per ASME B36.10. Custom sizes are available on request.

ASTM A335 P11 Pipe Weight Chart

The table below provides approximate weight per metre for selected sizes in SCH 40 and SCH 80. The weight of ASTM A335 P11 pipe depends on outer diameter, wall thickness, and schedule.

Dimensional Tolerances

ASTM A335 P11 pipes are manufactured under strict dimensional tolerance requirements for proper fit-up and pressure integrity. The key tolerances are summarised below:

ASTM A335 P11 Pipe Price

ASTM A335 P11 pipe pricing is ₹100 to ₹200 per kilogram or $0.95 to $4.20 per kg. Final pricing depends on outer diameter, wall thickness, schedule, quantity, length, and current steel market conditions. Larger diameters and heavier schedules (SCH 120, XXS) cost more per kilogram. The final price is also affected by testing requirements and end preparation.

ASTM A335 P11 Pipe Chemical Composition

The chemical composition of ASTM A335 / ASME SA-335 P11 pipe is shown below, with chromium and molybdenum as the principal alloying elements for high-temperature strength.
Chromium at 1.00 to 1.50% forms a protective oxide scale that resists oxidation in steam and flue gas environments. Molybdenum at 0.44 to 0.65% stabilises carbide precipitates along grain boundaries.

ASTM A335 P11 Pipe Mechanical Properties

ASTM A335 P11 pipe has a minimum tensile strength of 415 MPa (60 ksi), minimum yield strength of 205 MPa (30 ksi), and minimum elongation of 30% per ASTM A335 / ASME SA-335. The values apply to the heat-treated condition (annealed or normalised and tempered).

ASTM A335 P11 Equivalent Designations

ASTM A335 P11 pipe (ASME SA-335 P11) has equivalent designations in multiple international standards, allowing global buyers to cross-reference the grade against their local specifications.

ASTM A335 P11 Pipe Industrial Applications

ASTM A335 P11 pipe is used across 3 primary industrial sectors where piping systems operate at elevated temperatures and pressures. The 1.25Cr-0.5Mo composition provides the oxidation resistance and creep strength needed for continuous service at temperatures up to approximately 590°C (1094°F).

ASTM A335 P11 vs P22 Pipe: Key Differences

The table below provides the key differences between ASTM A335 P11 pipe and ASTM A335 P22 pipe.

P11 (1.25Cr-0.5Mo) is ideal for service up to approximately 590°C. P22 (2.25Cr-1Mo) handles higher temperatures up to approximately 600°C with greater creep resistance because of its higher chromium and molybdenum content. P11 is the more cost-effective option for moderately high-temperature applications.
Both grades share identical minimum tensile and yield strength values. P22's higher alloy content gives it better long-term creep performance above 560°C. For service below 540°C, P11 provides equivalent performance at lower cost.

Heat Treatment of ASTM A335 P11 Pipe

ASTM A335 P11 pipe should be heat treated by full annealing, isothermal annealing, or normalising and tempering at a minimum temperature of 650°C (1200°F).

Full annealing heats the pipe above the upper critical temperature, followed by furnace cooling to produce a soft ferritic-pearlitic microstructure. Normalising and tempering involve air cooling from the austenitising range. Then it is reheated to a minimum of 650°C. The tempering step relieves residual stresses and improves toughness.

Preheating at 200 to 300°C is recommended for field welding of A335 P11 alloy steel pipe. Post-weld heat treatment (PWHT) at 650 to 720°C is required to restore heat-affected zone properties and relieve welding stresses.

Shipping & Packaging

Heavy-duty wooden boxes Packing

Export Packaging Standard

We strictly follow seaworthy export handling standards to protect ASTM A335 P11 Pipe from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

• Heavy-duty wooden boxes with moisture barrier lining
• HDPE stretch film wrapping on all bundles
• Plastic end caps on threaded and plain-end pipes
• Silica gel desiccants to minimize moisture exposure
• ISPM-15 fumigated wooden packaging for export

Pipe Bundle Yard Staging

Container End-Cap Protection

Wrapped Export-Ready Bundles

Frequently Asked Questions