Low Temperature Buttweld Fittings

Grade 1 Low Temp, Grade 6 Low Temp, Grade 3 Low Temp ( ASTM A420 & ASME SA420 )

U.S. Metals is the premier worldwide supplier for all your Low Temperature Buttweld Fittings A420 / SA420 needs.

Our ability to provide Low Temperature 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.



  • Trade Name
    Grade 1 Low Temp
    Grade 6 Low Temp
    Grade 3 Low Temp
    Buttweld Fittings
    A/SA420 Grade WPL6
    A/SA420 Grade WPL6
    A/SA420 WPL3

    Carbon steel Grade WPL6 is impact tested at -50°F. Three and one half nickel Grade WPL3 material is impact tested for services down to -150°F.

    Charpy V-Notch Impact Testing is required and shall be performed in accordance with the requirements of A/SA420 and A/SA960.

  • The specification listed reflects the common materials required for manufacture and fabrication of items for use in Low Temperature Service. 
Ordering information for this specification in accordance with General Requirements Specification A/SA960 and should include:

1) Quantity.
2) Description of fittings and dimensions, either standard or special.
3) Grade and class of material.
4) Seamless or wewlded construction.
5) Complete specification number.
6) Special requirements for metric fittings are found in Specification A1058.
7) Any desired supplemental or additional requirements.
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.