Low Temperature Flanges

Grade LF2, Grade LF3 - Low Temperature Flanges

U.S. Metals is the premier worldwide supplier for all your Low Temperature Forged Flanges A350 / SA350 needs.

Our ability to provide Low Temperature Forged Flanges 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
    Forged Flanges
    A/SA350 Grade LF2
    A/SA350 Grade LF2
    A/SA350 Grade LF3

    Carbon steel Grade LF2 is impact tested at -50°F. Three and one half nickel Grade LF3 material is impact tested for services down to -150°F.

    Charpy V-Notch Impact Testing is required.

    Refer to Specifications A/SA961 for additional requirements. Optional supplementary requirements are listed in A/SA350 and A/SA961.

  • The specification listed above reflects the common materials required for manufacture and fabrication of items for use in Low Temperature Service.
Ordering information for this specification is as required by Specifications A/SA961. In addition, the order should indicate the number of test reports desired and address any applicable requirements found in the footnotes to A/SA350 Table 1.
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.