ASTM A335 Grade P9 is also commonly known as ASME SA335 Grade P9 Pipes, it is a seamless ferritic alloy-steel pipe that mainly has high-temperature applications. The UNS designation for this grade P9 is K90941.
ASTM A335 Grade P9 pipes have minimum yield strength of 205 MPA while their minimum Yield Strength is 415 MPA. These pipes have a minimum elongation percentage of about 30/20 L/T. Phosphating, passivation, shot blasting, oil dip and varnishing are some of the surface treatments possible for A335 pipes. These pipes can be tested by a variety of methods including flattening, surface and dimension, mechanical properties, hardness, chemical composition, inspection, bending, etc.
ASTM A335 Grade P9 Seamless Pipe
ASTM A335 P9 Pipe
P9 Alloy Steel Seamless Pipe
These pipes have a variety of uses and are thus used in many industries like boiler, chemical, electric, petroleum, oil and gas, etc. These pipes are widely used due to two significant properties – one is its high corrosion resistance and the second is its ability to perform in high as well as cryogenic temperatures. These pipes have exceptional machinability and weldability thus making them an excellent candidate for flanging and bending. P9 pipes are built for high-temperature service and are thus highly recommended for use in equipment like cokers, hydrocrackers, high and super high-temperature lines, reheat lines, etc.
N-Pipe Solutions Inc. is a major supplier of Low Alloy steel Seamless pipes from India. We provide high-quality pipes to clients throughout the world. Pipes are stock in NPS/NB dimension as per ASME B36.10 in various thicknesses as per clients requirements. All pipes supplied by us are duly inspected by our in-house quality control department before being supplied to the client. All pipes are available with complete traceability and mill test certificate as per EN 10204 3.1.
We provide the best competitive prices to our clients backed by quality service.
This specification covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high-temperature service. Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.
2.1 ASTM Standards:
A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
E92 Test Methods for Vickers Hardness and Knoop Hardness of Metallic Materials
E213 Practice for Ultrasonic Testing of Metal Pipe and Tubing
E309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
E570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
2.2 ASME Standard:
B36.10M Welded and Seamless Wrought Steel Pipe
Orders for material under this specification should include the following, as required, to describe the desired material adequately:
Material furnished to this specification shall conform to the applicable requirements of the current edition of Specification A999/A999M, unless otherwise provided herein
All pipes shall be reheated for heat treatment and heat-treated by the requirements of Table 2.
TABLE 2 Heat Treatment Requirements A
|Grade||Heat Treat Type||Normalizing Temperature, min or range °F [°C]||Cooling Media||Subcritical Annealing or Tempering Temperature, min or range °F [°C]|
|P9||full or isothermal anneal or||--||--||--|
|normalize and temper or||--||--||1200 |
A Where ellipses (--) appear in this table there is no requirement.
|Grade||UNS Designation A||Carbon||Manganese||Phosphorus, max||Sulfur, max||Silicon||Chromium||Molybdenum||Others|
A New designation established in accordance with Practice E527 and SAE J1086, Practice for Numbering Metals and Alloys (UNS).
D Applies to both heat and product analyses.
|Grade||Tensile strength, min:||Yield strength, min:||Elongation Requirements|
1) For pipe ordered to NPS [DN] or outside diameter, variations in outside diameter shall not exceed those specified in Table 6.
2) For pipe ordered to inside diameter, the inside diameter shall not vary more than +/- 1 % from the specified inside diameter.
|NPC [DN] Designator||Over||Under|
|1/2 to 1 1/2 [6 to 40],incl.||1/64 (0.015)||0.40||1/64 (0.015)||0.40|
|Over 1/2 to 4 [40 to 100],incl.||1/32 (0.031)||0.79||1/32 (0.031)||0.79|
|Over 4 to 8 [100 to 200],incl.||1/16 (0.031)||0.79||1/16 (0.031)||0.79|
|Over 8 to 12 [200 to 300],incl.||3/32 (0.031)||0.79||1/32 (0.031)||0.79|
|Over 12 ||± 1% of specified outside diameter|
In addition to the implicit limitation of wall thickness for pipe imposed by the limitation on weight in Specification A999/A999M, the wall thickness for pipe at any point shall be within the tolerances specified in Table 7. The minimum wall thickness and outside diameter for inspection for compliance with this requirement for pipe ordered by NPS [DN] and schedule number is shown in ASME B36.10M.
|NPS [DN] Designator||Tolerance, % form Specified|
|1/8 to 2 1/2 [6 to 65] incl., all t/D ratios A||20.0||12.5|
|Above 2 1/2, t/D<=5%A||22.5||12.5|
|Above 2 1/2, t/D>5%A||15.0||12.5|
A t= Specified Wall Thikness; D=Specified Outer Diameter.
The pipes need to be Hydro tested as per ASTM A530.
Transverse or Longitudinal Tension Test, Hardness Test, and Flattening or Bend Test
Certification and test reports, as described in Section 25 of Specification A999/A999M, are required.
16.1 In addition to the marking prescribed in Specification A999/A999M, the marking shall include the length, the schedule number, if the pipe is ordered to a schedule number, and the heat number or manufacturer’s number by which the heat can be identified. An additional symbol “S”, if the pipe conforms to any of the Supplementary Requirements S1 to S6, The marking may be by stenciling, stamping, or rolling at manufacture’s option.
Furthermore, the marking designated in below table to indicate the test method(s) shall be included.
|Marking to indicate the test method(s)|
NDE can be any of the following: Ultrasonic / Flux Leakage / Eddy Current