ASTM A335 P11 SEAMLESS ALLOY STEEL PIPE FOR BOILER PLANT OR POWER PLANT   ASTM A335 P11 Chemical Compositions(%)

Compositions	Data
UNS Designa-tion	K11597
Carbon	0.05-0.60
Manganese	0.30-0.60
Phosphorus(max.)	0.025
Sulfur(max.)	0.025
Silicon	0.50-1.00
Nickel	…
Chromium	1.00-1.50
Molybdenum	0.44-0.65
Other Elements	…

Mechanical properties for ASTM A335 P11

Properties	Data
Tensile strength, min, (MPa)	415 Mpa
Yield strength, min, (MPa)	205 Mpa
Elongation, min, (%), L/T	30/20

Material & Manufacture Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below. Heat Treatment

• A / N+T
• N+T / Q+T
• N+T

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:

• P11 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.