ASTM A335 P11 Pipe Specification (Chrome Moly Seamless Pipe)

ASTM A335 P11 Pipe (ASME SA335 P11) is Chrome Moly Alloy Seamless Pipe that used for high-temperature services, P11 Grade Pipe Chrome content at 1.00% to 1.50%, Moly content 0.44% to 0.65%, Minimum tensile strength 415MPa, minimum yield strength 205Mpa.

P11 pipe material has high toughness and high wear and tear resistance, it could be used to manufacture pipe fittings like elbow, tee, reducers, and flanges as following standard:

Pipe fittings standard: ASTM A234 WP11
Flange Standard: ASTM A182 F11

Equivalent Steel Plate Standard: ASTM A387 Grade 11/ ASME SA387 Grade 11
Welded pipe standard: ASTM A691 1-1/4 CR

ASTM A335 specificaton covers nominal wall and minimum wall thickness pipe that with alloy material and manufactured in seamless type. The pipe under this specification shall be suitable for bending, flanging, and all the other similar processing and formations. Although it shall be good for fusion welding.

ASTM A335 P11, P22 – Common Use Grade

ASTM A335 P11 and P22 are most common use in Chrome Moly Alloy Pipes for high temperature environment, for power industry and petro-chemical plants.

Chrome Moly Alloy ASTM A335 pipe

ASTM A335 pipe called chrome moly pipe as they have a high level of Chromium and Molybdenum presence in it. While Molybdenum increases the overall strength, resistance, elasticity, hardenability and overall quality, moly ensures that the material is more resistant to softening, restrains the growth of grains and lessens the chances of embrittlement. It is the single additive that is responsible for the increase in high temperature resistance (to 540-750°C) and it also improves the corrosion resistance to steel.

Key Elements – Chromium

Chromium is a key component that is used in the manufacture of stainless steel. If the chromium levels are above 12%, it can be classified as stainless steel. The oxidation resistance potential of chrome is irreplaceable even in elevated temperatures. The hardness, tensile and yield strength is better at standard temperatures. Due to the composition of the material, it is ideal to be used in power plants, refineries, petro-chemical plants and other oil field services when there is transportation under high temperatures and pressures involved.

ASTM A335 P11/ASME SA355 P11 Data Sheet

Chemical Composition and for other P grade Pipe

Mechanical Properties

Referred standards for making ASTM A335 P11 Pipe

a. ASTM A999/ A999M, Standard specification for common requirements for stainless and alloy steel pipe
b. ASTM A92, Hardness test methods for steel materials
c. E213, Instructions and practice for ultra sonic testing of steel pipe and tube
d. E309 Eddy-Current Examniation methods for steel pipe products
e, E381, Inspection methods for steel bars, beams, profiles, billets and forgings.
f, E527, Numbering metals and alloys practices
g, E570, Instructions for flux leakage examniation of ferromagnetic steel pipe products

Dimension standard: ASME B36.10M
Manufacturing process: Hot finished or Cold drawn
Heat treatment methods different for each grade

Tests

Tensile tests: Transverse and Longitudinal
Flattening test
Hardness test
Bend Test

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