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A/SA335 |
NPS 1/4" - 24" |
Schedules 40 through 160, STD, XH and XXH |
Scope
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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. |
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Material & Manufacture
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Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below. |
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Heat Treatment Requirements
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P5, P9, P11, and P22 |
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| Grade |
Heat Treatment Type |
Normalizing Temperature Range F [C] |
Subcritical Annealing or Tempering
Temperature Range F [C] |
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| P5 (b,c) |
Full or Isothermal Anneal |
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Normalize and Temper |
***** |
1250 [675] |
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Subcritical Anneal (P5c only) |
***** |
1325 - 1375 [715 - 745] |
| P9 |
Full or Isothermal Anneal |
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Normalize and Temper |
***** |
1250 [675] |
| P11 |
Full or Isothermal Anneal |
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Normalize and Temper |
***** |
1200 [650] |
| P22 |
Full or Isothermal Anneal |
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Normalize and Temper |
***** |
1250 [675] |
| P91 |
Normalize and Temper |
1900-1975 [1040 - 1080] |
1350-1470 [730 - 800] |
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Quench and Temper |
1900-1975 [1040 - 1080] |
1350-1470 [730 - 800] |
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Chemical Requirements
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Grade |
P-5 |
P-9 |
P-11 |
P-22 |
P-91 |
P-91 shall also include the following: |
| Element |
UNS Designation |
K41545 |
S50400 |
K11597 |
K21590 |
K91560 |
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Carbon |
0.15 max |
0.15 max |
0.05 - 0.15 |
0.05 - 0.15 |
0.08 - 0.12 |
V at 0.18 - 0.25 |
| Manganese |
0.30 - 0.60 |
0.30 - 0.60 |
0.30 - 0.60 |
0.30 - 0.60 |
0.30 - 0.60 |
N at 0.030 - 0.070 |
| Phosphorous, max |
0.025 |
0.025 |
0.025 |
0.025 |
0.020 |
Ni at 0.40 max |
| Sulfur, max |
0.025 |
0.025 |
0.025 |
0.025 |
0.010 |
Al at 0.02 max |
| Silicon |
0.50 max |
0.25 - 1.00 |
0.50 - 1.00 |
0.50 max |
0.20 -0.50 |
Cb at 0.06 - 0.10 |
| Chromium |
4.00 - 6.00 |
8.00 - 10.00 |
1.00 - 1.50 |
1.90 - 2.60 |
8.00 - 9.50 |
Ti at 0.01 max |
| Molybdenum |
0.45 -0.65 |
0.90 - 1.10 |
0.44 - 0.65 |
0.87 - 1.13 |
0.85 - 1.05 |
Zr at 0.01 max |
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Tensile Requirements
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Seamless |
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P-5 |
P-9 |
P-11 |
P-22 |
P-91 |
P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC]. |
| Tensile Strength, min., psi |
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ksi |
60 |
60 |
60 |
60 |
85 |
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MPa |
415 |
415 |
415 |
415 |
585 |
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| Yield Strength, min., psi |
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ksi |
30 |
30 |
30 |
30 |
60 |
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MPa |
205 |
205 |
205 |
205 |
415 |
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Permissible Variation in Wall Thickness
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| NPS [DN] Designator |
Tolerance, % from Specified |
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Over |
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Under |
| 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios |
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20.0% |
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12.5% |
| Above 2 1/2 [65], t/D < or = 5% |
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22.5% |
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12.5% |
| Above 2 1/2 [65], t/D > 5% |
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15.0% |
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12.5% |
| (t = Specified Wall Thickness; D = Specified Outside Diameter) |
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Elongation Requirements
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| Calculated Minimum Elongation Values |
| Elongation in 2 in. or 50 mm, min % |
| Wall Thickness |
P5, P9, P11, P22 |
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P91 |
| in. |
mm |
Longitudinal |
Transverse |
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Longitudinal |
| 5/16 (0.312) |
8 |
30 |
20 |
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20 |
| 9/32 (0.281) |
7.2 |
28 |
19 |
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19 |
| 1/4 (0.250) |
6.4 |
27 |
18 |
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18 |
| 7/32 (0.219) |
5.6 |
26 |
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17 |
| 3/16 (0.188) |
4.8 |
24 |
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16 |
| 5/32 (0.156) |
4 |
22 |
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15 |
| 7/8 (0.125) |
3.2 |
21 |
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14 |
| 3/32 (0.094) |
2.4 |
20 |
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13 |
| 1/18 (0.062) |
1.6 |
18 |
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12 |
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Permissible Variations in Outside Diameter
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Outside Diameter at any point shall not vary from standard specified more than: |
| NPS [DN] Designator |
Over |
Under |
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in. |
mm |
in. |
mm |
| 1/8 to 1 1/2 [6 to 40], incl. |
1/64 (0.015) |
0.40 |
1/64 (0.015) |
0.40 |
| Over 1 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 (0.062) |
1.59 |
1/32 (0.031) |
0.79 |
| Over 8 to 12 [200 to 300], incl. |
3/32 (0.093) |
2.38 |
1/32 (0.031) |
0.79 |
| Over 12 [300] |
+/- 1% of the specified outside diameter |
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Mechanical
Tests Specified
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| Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test |
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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. |
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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. |
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Notes for Hardness Test: |
P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC]. |
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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. |
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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. |
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The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion. |
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The inside diameter of the bend shall be 1 inch [25 mm]. |
| Hydrostatic Test |
Each length of pipe shall be Hydro tested, at option of manufacture nondestructive electric testing can be used. |
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Required Markings on
Each Length
(On Tags attached to each Bundle in case of Bundled Pipe) |
Markings will adhere to prescribed specifications in A 999/A999M and be: Rolled, Stamped, or Stenciled (Mfrs. Option) |
| In addition, markings will include: |
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Length of pipe |
| Marking to indicate the test method(s) |
| Hydrostatic |
Nondestructive |
Marking |
| YES |
NO |
Test Pressure |
| NO |
YES |
NDE |
| NO |
NO |
NH |
| YES |
YES |
Test Pressure/NDE |
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Schedule Number |
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Heat Number or Manufacturer's number by which heat can be identified |
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An Additional Symbol "S" if the pipe conforms to any Supplementary Requirements |
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S1 - Product Analysis |
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S2 - Transverse Tension Test |
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S3 - Flattening Test |
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S4 - Metal Structure and Etching Tests |
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S5 - Photomicrographs |
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S6 - Photomicrographs for Individual Pieces |
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S7 - Alternative Heat Treatment - Grade P91 |
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Pipe that has been weld repaired shall be marked "WR". |
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Reference Documents
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ASTM A999/A 999M Specification for General requirements for Alloy and Stainless Steel Pipe. |
| ASTM E 213 Practice for Ultrasonic Examination of metal Pipe and Tubing |
| ASTM E 309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation |
| ASTM E 381 Method of Macroetch testing Steel Bars, Billets, Blooms, and Forgings |
| ASTM E 570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products |
| ASME B26.10M Welded and Seamless Wrought Steel Pipe |
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Ordering
Information
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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 |
| End Finish |
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