Chrome Moly Alloy Seamless Pipe

P91, P22, P5, P11, P9, P92 ( ASTM A335 & ASME SA335 ) - Alloy Seamless Pipe

U.S. Metals is a premier worldwide supplier for all your Chrome Moly Alloy A335 / SA335 Seamless Piping needs.

Our Chrome Alloy Seamless Piping inventory is unsurpassed and is considered one of the most extensive chrome inventories in the world!

Turnarounds or outages, planned retrofits or emergency situations, grassroots projects worldwide; U.S. Metals has the experienced staff to assist you on all of your specialty alloy requirements, no matter how detailed the specification, no matter how difficult the situation.

New industry requirements, not an issue. We work closely with agencies like EPRI along with our utility and refining clients to be on the cutting edge of new industry requirements that affect your high energy/high temperature piping systems.

Our inventory is evolving to meet the new specifications that prevent current issues as creep cracking and hardness problems.



  • Trade Name 
    Grade
    UNS #
    Pipe
    Forged / Bored Pipe *
    1 1/4 Chrome 
    P11
    K11597
    A335 / SA335
    A369 / SA369
    2 1/4 Chrome 
    P22
    K21590
    A335 / SA335
    A369 / SA369
    5 Chrome 
    P5
    K41545
    A335 / SA335
    A369 / SA369
    9 Chrome 
    P9
    S50400
    A335 / SA335
    A369 / SA369
    P91
    P91
    K91560
    A335 / SA335
    A369 / SA369
    P92
    P92
    K92460
    A335 / SA335
    A369 / SA369

    Materials in industry standard designations: STD, 40, XH, 60, 80, 100, 120, 140, 160, XXH
    Special customer designated nominal and minimum wall thicknesses can also be furnished.
    Non standard OD & ID are available.

    * U.S. Metals can offer pipe from turned and bored forgings in accordance with Specifications A/SA369 when client requirements for size, wall thickness, quantity or delivery cannot be met by material available under Specifications A/SA335.

    A/SA369 material is manufactured in grades including FP11, FP22, FP5, FP9, FP91, and FP92 corresponding to the same grades listed above for A/SA335.
  • This specification covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high-temperature service. Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.
Orders for material under this specification should include the following, as required, to describe the desired material adequately:

  • Quantity (feet, metres, or number of lengths)
  • Name of material (seamless alloy steel pipe)
  • Grade
  • Manufacture (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 (Ends Section of Specification A999/A999M)
  • Optional requirements (Section 8, 12 and 13 of this specification. See the Sections on Hydrostatic Test Requirements and Permissible Variation in Weight for Seamless Pipe in Specification A999/A999M)
  • Specification designation
  • Special requirements or any supplementary requirements selected, or both.
Information provided in this page is in accordance with the 2013 Edition of the ANNUAL BOOK OF ASTM STANDARDS
Refer to ASME B & PV Code Section II for non-identical A/SA requirements.