description of ASTM A335 P1 Seamless Alloy Steel Pipe
ASTM A335 Grade P1 (ASME SA333 GR. P1) specification pipes are generally Ferritic alloy steel pipes used for High-temperature services, this specification falls under the Low Alloy steel pipes category. These pipes are manufactured through the Seamless production process. The UNS designation for this grade P1 is K11522.
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These pipes have a minimum tensile strength of 415 MPa and a minimum Yield Strength of 205 MPa with an elongation of a minimum of 30%/20%. This pipe can be both cold drawn or hot-finished with finishing heat-treated to either isothermal annealed or normalized and tempered.
These pipes are ideal for flanging, bending, etc. under high temperature situations. These pipes are used in industries like oil and gas, boilers, chemical and petrochemical as well as in high temperature pipelines and various engineering applications. These pipes are available in various thicknesses and sizes as per the project’s specifications. The pipes are manufactured in size as per NPS / NB size with dimension standard as per ASME/ANSI B36.10. The ends of these pipes can be supplied in threaded, bevelled or plain ends.
These P1 pipes are alloyed with different elements to improve upon their base physical properties and to create new specialized properties such as heat and corrosion resistance. ASTM A335 P1 pipes combine carbon steel with materials like aluminium, copper or nickel as per the requirements of the project. Carbon is the most important element of the mix. It increases strength, hardness and resistance to wear and abrasion. However, the downside is that it lowers ductility, toughness and machinability, to resolve this Molybdenum is added to the chemical composition of pipes which provides improved ductility, enhances its elastic limit and impact qualities.
| Grade | UNS Designation A | Carbon | Manganese | Phosphorus, max | Sulfur, max | Silicon | Chromium | Molybdenum | Others |
|---|---|---|---|---|---|---|---|---|---|
| P1 | K11522 | 0.10–0.20 | 0.30–0.80 | 0.025 | 0.025 | 0.10–0.50 | -- | 0.44–0.65 | -- |
| Grade | Tensile strength, min: | Yield strength, min: | Elongation Requirements | |||
|---|---|---|---|---|---|---|
| KSI | MPa | KSI | MPa | Longitudinal | Transverse | |
| P1 | 55 | 380 | 30 | 205 | 30 | 20 |
| Size | 1/8NB TO 26NB IN |
|---|---|
| Standards | ASTM A 335 | ASME SA335 |
| Type | Seamless |
| P1 Pipe Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, SCH XXS |
| Form | Round |
| Length | Standard, Custom, Cut length |
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] |
|---|---|---|---|---|
| P1 | full or isothermal anneal or | -- | -- | -- |
| normalize and temper or | -- | -- | 1200 [650] | |
| subcritical anneal | -- | -- | 1200–1300 [650–705] |
A Where ellipses (--) appear in this table there is no requirement.
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 | ||
|---|---|---|---|---|
| in. | mm | in. | mm | |
| 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 [300] | ± 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 | |
|---|---|---|
| Over | Under | |
| 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios A | 20.0 | 12.5 |
| Above 2 1/2[65], t/D<=5%A | 22.5 | 12.5 |
| Above 2 1/2[65], 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) | ||
|---|---|---|
| Hydrostatic | Non Destructive | Marking |
| YES | NO | Test Pressure |
| NO | YES | NDE |
| NO | NO | NH |
| YES | YES | Test Pressure/NDE |
NDE can be any of the following: Ultrasonic / Flux Leakage / Eddy Current
Shandong Kuaima Steel Co., Ltd. has advanced special smelting, investment casting, pipe making and other production equipment. The company has 15 advanced production lines, which can independently produce alloy steel pipe, hot/cold rolled steel, galvanized steel, galvanized steel, prepainted steel and stainless steel coils, strips, plates, plates, pipes, bars and other products. The standing inventory is more than 450,000 tons to meet the customer's demand for delivery time.
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