Nickel Alloy Buttweld Fittings

Incoloy®, Alloy 20®, Monel® 400, Inconel®, Nickel 200, Nickel 201 - Buttweld Fittings

U.S. Metals is a premier worldwide supplier for all your Nickel Alloy Buttweld Fittings needs.

Our ability to provide Nickel Alloy Buttweld Fittings on a project basis is one of our strongest capabilities and is unmatched in our industry.

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.



  • The table shown above addresses only the WP Grade wrought buttweld fittings produced in accordance with ASME B16.9. The permissible raw materials and manufacturing operations listed in B/SB366 allow producing forged threaded and socket weld fittings in accordance with ASME B16.11.

    Specifications B/SB366 cover all the material grades listed above. Alloy 20 is the only grade listed above that is covered by A/SA182. B/SB462 also covers Alloy 20 B16.11 forged fittings.

    Most nickel/nickel alloy specifications especially in pipe and tube refer only to the uns number for material identification. Classes and Grades are occasionally used to identify options for items such as NDT, heat treatment or different methods employed when welding with filler metal such as single welded or double welded. these options do not result in an additional uns number in the nickel materials.

    Grades/Classes/Identification Symbols are shown in this table only when they are used for material identification. Buttweld Fittings under B/SB366 have the same suffix class marking requirements (S,W,WX,WU and CR) as A/SA403.

    Specification B/SB564 permits manufacture of all the grades listed above except for Nickel 201 and Alloy 20.
    Refer to U.S. Metals' forged fitting web page for more details.
  • Specification B/SB366 offers suggested requirements for purchasing requirements including but not limited to the following:

    1) Quantities to be furnished.
    2) Description of fitting including any non-standard dimensional requirements.
    3) Alloy / UNS Designation.
    4) Selection of heat treatment desired when purchaser options are offered. Refer to heat treatment requirements for Inconel 625 for an example.
    5) WP fitting Class (S, W, WX or WU).
    6) Any Purchaser Inspection requirements at the manufacturing facility.
    7) Any purchaser requirements for providing material for Product Check Analysis.
    8) Test Report requirements.
    9) Any supplementary requirements desired.
Information provided in this page is in accordance with the 2013 Edition of the ANNUAL BOOK OF ASTM STANDARDS, Section Two VOLUME 02.04.
Refer to ASME B & PV Code Section II for non-identical B/SB requirements.