ASTM A335 P91 P11 P22 P5 Seamless Pipe
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ASTM A335 Seamless Ferritic Alloy Steel Pipe for High-Temperature Service
Astm A335 standard specication for seamless ferritic alloy-Steel Pipe for high-temperature service ASTM A335 standard is issued under the fixed designation A 335/A 335M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ュ) indicates an editorial change since the last revision or reapproval.
Main ASTM A335 alloy pipes/tubes
General Abbreviations of chrome moly pipe are chrome-moly, cro-moly, CrMo, CRMO, CR-MOLY.
The range of ASTM A335 P9 seamless alloy steel pipe sizes that may be examined by each method shall be subjected...
ASTM A335 P11 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. 
ASTM A335 P22 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding.
Scope
1.1This specification covers nominal (average) wall seamless alloy-steel pipe intended for high-temperature service (Mote 1). 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.
NOTE 1 Α Appendix X1 lists the sizes and wall thicknesses of pipe which may be obtained under current commercial practice.
1.2 Several grades of ferritic steels (Note 2) are covered. Their compositions are given in Table 1.
Chemical Composition:
| Grade | C | Mn | P | S | Si | Mo |
| P1 | 0.10-0.20 | 0.30-0.80 | 0.025 | 0.025 | 0.10-0.50 | 0.44-0.65 |
| P2 | 0.10-0.20 | 0.30-0.61 | 0.025 | 0.025 | 0.10-0.30 | 0.44-0.65 |
| P5 | 0.15max | 0.30-0.60 | 0.025 | 0.025 | 0.50max | 0.45-0.65 |
| P5b | 0.15max | 0.30-0.60 | 0.025 | 0.025 | 1.00-2.00 | 0.45-0.65 |
| P5c | 0.12max | 0.30-0.60 | 0.025 | 0.025 | 0.50max | 0.45-0.65 |
| P9 | 0.15max | 0.30-0.60 | 0.025 | 0.025 | 0.25-1.00 | 0.90-1.10 |
| P11 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 0.44-0.65 |
| P12 | 0.05-0.15 | 0.30-0.61 | 0.025 | 0.025 | 0.50max | 0.44-0.65 |
| P15 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 1.15-1.65 | 0.44-0.65 |
| P21 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50max | 0.80-1.06 |
| P22 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50max | 0.87-1.13 |
| P23 | 0.04-0.10 | 0.10-0.60 | 0.030max | 0.010max | 0.50max | 0.05-1.30 |
Mechanical Properties
| Mechanical properties | P1,P2 | P12 | P23 | P91 | P92,P11 | P122 |
| Tensile strength | 380 | 415 | 510 | 585 | 620 | 620 |
| Yield strength | 205 | 220 | 400 | 415 | 440 | 400 |
| Heat Treatment | A / N+T | N+T / Q+T | N+T |
Material & Manufacture
Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.
Heat Treatment Requirements
| Grade | Heat Treatment Type
P5, P9, P11, and P22 | Normalizing Temperature Range F [C] | Subcritical Annealing or Tempering
Temperature Range F [C] |
| A335 P5 (b,c) | Full or Isothermal Anneal | | |
| | Normalize and Temper | ***** | 1250 [675] |
| | Subcritical Anneal (P5c only) | ***** | 1325 – 1375 [715 - 745] |
| A335 P9 | Full or Isothermal Anneal | | |
| | Normalize and Temper | ***** | 1250 [675] |
| A335 P11 | Full or Isothermal Anneal | | |
| | Normalize and Temper | ***** | 1200 [650] |
| A335 P22 | Full or Isothermal Anneal | | |
| | Normalize and Temper | ***** | 1250 [675] |
| A335 P91 | Normalize and Temper | 1900-1975 [1040 - 1080] | 1350-1470 [730 - 800] |
| | Quench and Temper | 1900-1975 [1040 - 1080] | 1350-1470 [730 - 800] |
Mechanical Tests Specified
Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test
For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot. For small lots, at least one pipe shall be tested.
For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe.
Notes for Hardness Test:
P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].
Notes for Bend Test:
For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test.
Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser.
The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion.
Hydrostatic Test
The inside diameter of the bend shall be 1 inch [25 mm].
Each length of pipe shall be Hydro tested, at option of manufacture nondestructive electric testing can be used.
Ordering Information
Orders for material under this specification should include the following, as required, to describe the desired material adequately:
| Quantity | Feet, meters, or number of lengths |
| Name of material | Seamless Alloy Steel Pipe |
| Grade | P5, P9, P11, P22, P91 |
| Manufacture | Hot-finished or cold-drawn |
| Size using one of the following: |
| NPS and Schedule Number |
| Outside Diameter and Nominal Wall Thickness |
| Outside Diameter and Minimum Wall Thickness |
| Inside Diameter and Nominal Wall Thickness |
| Inside Diameter and Minimum Wall Thickness |
| Length | Specific or Random |
|
Product Categories : Steel Pipe > Alloy Steel Pipe
