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.
Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.
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] |
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 |
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 |
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) |
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 |
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 |
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. |
Author:
Ms. Sunny Peng
Phone/WhatsApp:
+8618333120628
September 13, 2022
September 13, 2022
September 09, 2022
September 09, 2022
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Author:
Ms. Sunny Peng
Phone/WhatsApp:
+8618333120628
September 13, 2022
September 13, 2022
September 09, 2022
September 09, 2022