A/SA335
NPS 1/4″ – 24″
Schedules 40 through 160, STD, XH and XXH
API 5L Line Pipes, API 5L Grade B Line Pipe, API 5L Grade B Pipe, API 5L Gr. B Pipe, API 5L Grade B Carbon Steel Pipe, API 5L grade B PSL2 Pipe, API 5L Carbon Steel Pipes Grade B, X42/X46/X52/X56/X60/X65/X70/X80 PSL-1/PSL-2
Scope
This specification covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high-temperature service. ASTM A335 pipe ordered to this specification shall be suitable for fusion welding, bending, flanging (vanstoning), and similar forming operations.
Material & Manufacture
Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.
Heat Treatment Requirements
|
P5, P9, P11, and P22 |
|
|
| Grade |
Heat Treatment Type |
Normalizing Temperature Range F [C] |
Subcritical Annealing or Tempering
Temperature Range F [C] |
|
| P5 (b,c) |
Full or Isothermal Anneal |
|
|
|
Normalize and Temper |
***** |
1250 [675] |
|
Subcritical Anneal (P5c only) |
***** |
1325 – 1375 [715 – 745] |
| P9 |
Full or Isothermal Anneal |
|
|
|
Normalize and Temper |
***** |
1250 [675] |
| P11 |
Full or Isothermal Anneal |
|
|
|
Normalize and Temper |
***** |
1200 [650] |
| P22 |
Full or Isothermal Anneal |
|
|
|
Normalize and Temper |
***** |
1250 [675] |
| P91 |
Normalize and Temper |
1900-1975 [1040 – 1080] |
1350-1470 [730 – 800] |
|
Quench and Temper |
1900-1975 [1040 – 1080] |
1350-1470 [730 – 800] |
Chemical Requirements
|
|
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 |
| 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 |
Tensile Requirements
|
|
Seamless |
|
|
|
|
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 |
|
|
|
|
|
|
ksi |
60 |
60 |
60 |
60 |
85 |
|
MPa |
415 |
415 |
415 |
415 |
585 |
|
|
| Yield Strength, min., psi |
|
|
|
|
|
|
|
|
ksi |
30 |
30 |
30 |
30 |
60 |
|
|
|
MPa |
205 |
205 |
205 |
205 |
415 |
|
|
Permissible Variation in Wall Thickness
| NPS [DN] Designator |
Tolerance, % from Specified |
|
|
Over |
|
Under |
| 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios |
|
20.0% |
|
12.5% |
| Above 2 1/2 [65], t/D < or = 5% |
|
22.5% |
|
12.5% |
| Above 2 1/2 [65], t/D > 5% |
|
15.0% |
|
12.5% |
| (t = Specified Wall Thickness; D = Specified Outside Diameter) |
Elongation Requirements
| Calculated Minimum Elongation Values |
| Elongation in 2 in. or 50 mm, min % |
| Wall Thickness |
P5, P9, P11, P22 |
|
P91 |
| in. |
mm |
Longitudinal |
Transverse |
|
Longitudinal |
| 5/16 (0.312) |
8 |
30 |
20 |
|
20 |
| 9/32 (0.281) |
7.2 |
28 |
19 |
|
19 |
| 1/4 (0.250) |
6.4 |
27 |
18 |
|
18 |
| 7/32 (0.219) |
5.6 |
26 |
|
|
17 |
| 3/16 (0.188) |
4.8 |
24 |
|
|
16 |
| 5/32 (0.156) |
4 |
22 |
|
|
15 |
| 7/8 (0.125) |
3.2 |
21 |
|
|
14 |
| 3/32 (0.094) |
2.4 |
20 |
|
|
13 |
| 1/18 (0.062) |
1.6 |
18 |
|
|
12 |
Permissible Variations in Outside Diameter
Outside Diameter at any point shall not vary from standard specified more than:
| NPS [DN] Designator |
Over |
Under |
|
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 |
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. |
|
|
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. |
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: |
|
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 |
|
|
Schedule Number |
|
Heat Number or Manufacturer’s number by which heat can be identified |
|
An Additional Symbol “S” if the pipe conforms to any Supplementary Requirements |
|
S1 – Product Analysis |
|
S2 – Transverse Tension Test |
|
S3 – Flattening Test |
|
S4 – Metal Structure and Etching Tests |
|
S5 – Photomicrographs |
|
S6 – Photomicrographs for Individual Pieces |
|
S7 – Alternative Heat Treatment – Grade P91 |
|
Pipe that has been weld repaired shall be marked “WR”. |
Reference Documents
- 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
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 |
| Manufacturer |
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 |