Grade	UNS Designation A	Carbon	Manganese	Phosphorus, max	Sulfur, max	Silicon	Chromium	Molybdenum	Others
P1	K11597	0.05-0.15	0.30–0.60	0.025	0.025	0.50-1.00	1.00-1.50	0.44–0.65	--

Mechanical properties of ASTM A335 Gr. P11 Pipes

Heat Treatment:

All pipes shall be reheated for heat treatment and heat-treated by the requirements of Table 2.

TABLE 2 Heat Treatment Requirements A

A Where ellipses (--) appear in this table there is no requirement.

Permissible Variations in Diameter

1) For pipe ordered to NPS [DN] or outside diameter, variations in outside diameter shall not exceed those specified in Table 6.
2) For pipe ordered to inside diameter, the inside diameter shall not vary more than +/- 1 % from the specified inside diameter.

Permissible Variations in Wall Thickness

In addition to the implicit limitation of wall thickness for pipe imposed by the limitation on weight in Specification A999/A999M, the wall thickness for pipe at any point shall be within the tolerances specified in Table 7. The minimum wall thickness and outside diameter for inspection for compliance with this requirement for pipe ordered by NPS [DN] and schedule number is shown in ASME B36.10M.

A t= Specified Wall Thikness; D=Specified Outer Diameter.

Hydrostatic test

The pipes need to be Hydro tested as per ASTM A530.

Mechanical Tests Required

Transverse or Longitudinal Tension Test, Hardness Test, and Flattening 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 1 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.
• Unless otherwise specified, the flattening test or bend test shall be chosen at the manufacturer’s option.

Certification

Certification and test reports, as described in Section 25 of Specification A999/A999M, are required.

Marking on pipes

16.1 In addition to the marking prescribed in Specification A999/A999M, the marking shall include the length, the schedule number, if the pipe is ordered to a schedule number, and the heat number or manufacturer’s number by which the heat can be identified. An additional symbol “S”, if the pipe conforms to any of the Supplementary Requirements S1 to S6, The marking may be by stenciling, stamping, or rolling at manufacture’s option.
Furthermore, the marking designated in below table to indicate the test method(s) shall be included.

NDE can be any of the following: Ultrasonic / Flux Leakage / Eddy Current