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Heat Treatment RequirementsA
|
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
normalize and temper
subcritical anneal
|
... ... ... |
... ... ... |
...
1200 [650]
1200-1300 [650-705]
|
|
P2
|
full or isothermal anneal
normalize and temper
subcritical anneal
|
... ... ... |
... ... ... |
... 1250 [675]
1200-1300 [650-705]
|
|
P5
|
full or isothermal anneal
normalize and temper
|
... ... |
... ... |
... 1250 [675]
|
|
P5b
|
full or isothermal anneal
normalize and temper
|
... ... |
... ... |
... 1250 [675]
|
|
P5c
|
subcritical anneal
|
... | ... |
1325-1375 [715-745]
|
|
P9
|
full or isothermal anneal
normalize and temper
|
... ... |
... ... |
... 1250 [675]
|
|
P11
|
full or isothermal anneal
normalize and temper
|
... ... |
... ... |
... 1200 [650]
|
|
P12
|
full or isothermal anneal
normalize and temper
subcritical anneal
|
... ... ... |
... ... ... |
... 1200 [650]
1200-1300 [650-705]
|
|
P15
|
full or isothermal anneal
normalize and temper
|
... ... |
... ... |
... 1200 [650]
|
|
P21
|
full or isothermal anneal
normalize and temper
|
... ... |
... ... |
... 1250 [675]
|
|
P22
|
full or isothermal anneal
normalize and temper
|
... ... |
... ... |
... 1250 [675]
|
|
P23
|
normalize and temper
|
1900-1975 [1040-1080]
|
air or
accelerated
cooling
|
1350-1470 [730-800]
|
|
P24
|
normalize and temper
|
1800–1870 [980–1020]
|
air or
accelerated
cooling
|
1350–1420 [730–770
|
|
P36
|
normalize and temperB
|
1650 [900]
|
... |
1100 [595]
|
|
P91
|
normalize and temper
quench and temperD
|
1900-1975 [1040-1080]
1900-1975 [1040-1080]
|
... ... |
1350-1470 [730-800]C
1350-1470 [730-800]
|
|
P92
|
normalize and temper
|
1900-1975 [1040-1080]
|
E |
1350-1470 [730-800
|
|
P122
|
normalize and temper
|
1900-1975 [1040-1080]
|
... |
1350-1470 [730-800]
|
|
P911
|
normalize and temper
|
1900-1975 [1040-1080]
|
E |
1365-1435 [740-780]
|
AWhere ellipses (...) appear in this table there is no requirement.
BAlternatively, Grade P36, Class 2 shall be cooled from the austenitizing temperature by accelerated cooling in air or by liquid quenching.
CExcept when Supplementary Requirement S7 is specified by the purchaser.
DWhen mutually agreed upon between the manufacturer and the purchaser, quenching and tempering shall be permitted for thicknesses greater than 3 in. [75 mm].
EAccelerated cooling from the normalizing temperature shall be permitted for section thicknesses greater than 3 in. [75 mm].
Permissible Variations in Outside Diameter
|
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
|
|||
Test Method Information for Certification and Marking
|
Ultrasonic
|
Flux Leakage
|
Eddy Current
|
Hydrostatic
|
Marking
|
|
NO
|
NO
|
NO
|
YES
|
TEST PRESSUREA
|
|
YES
|
NO | NO | NO | UT |
|
NO
|
YES |
NO
|
NO
|
FL |
|
NO
|
NO
|
YES |
NO
|
EC |
| YES | YES |
NO
|
NO
|
UT/FL
|
| YES | NO | YES | NO |
UT/EC
|
|
NO
|
NO
|
NO
|
NO
|
NH |
| YES | NO | NO | YES |
UT/TEST
PRESSUREA
|
| NO | YES | NO | YES |
FL/TEST
PRESSUREA
|
| NO | NO | YES | YES |
EC/TEST
PRESSUREA
|
ATest pressure is to be in psi [MPa].
Mechanical Tests Required
3.4 For pipes with wall thickness less than 0.065 in. [1.7mm], the hardness test shall not be required.
3.5 The Brinell test shall be made, at the option of the manufacturer, on the outside of the pipe near the end, on the outside of a specimen cut from the pipe, or on the wall cross section of a specimen cut from the pipe. This test shall be made so that the center of the impression to the edge of the specimen is at least 2.5 times the diameter of the impression.
3.6 The Rockwell hardness test shall, at the option of the manufacturer, be made on the inside surface, on the wall cross section, or on a flat of the outside surface.
3.7 For pipe of Grades P24, P91, P92, P122, P911, and P36, Brinell, Vickers, or Rockwell hardness tests shall be made on a specimen from each lot.
4. Bend Test:
4.1 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.
4.2 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 in. [25 mm].
4.3 Test specimens for the bend test specified in 14.4 shall be cut from one end of the pipe and, unless otherwise specified, shall be taken in a transverse direction. One test specimen shall be taken as close to the outer surface as possible and another from as close to the inner surface as possible. The specimens shall be either 1⁄2 by 1⁄2 in. [12.5 by 12.5 mm] in section or 1 by 1⁄2 in. [25 by 12.5 mm] in section with the corners rounded to a radius not over 1⁄16 in. [1.6 mm] and need not exceed 6 in. [150 mm] in length. The side of the samples placed in tension during the bend shall be the side closest to the inner and outer surface of the pipe, respectively.
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