ASTM WK67179

    Revision of A1069 / A1069M - 16 Standard Specification for Laser-Fused Stainless Steel Bars, Plates, and Shapes

    (What is a Work Item?)

    Active Standard: A1069 / A1069M - 19

    Developed by Subcommittee: A01.17 | Committee A01 | Contact Staff Manager



    WK67179


    Keywords

    joining; laser-fusion; laser-weld; plates; shapes; stainless;;

    Rationale

    This revision by the primary suppliers of this product (Montanstahl / Stainless Structurals) makes updates throughout the document. The title and document have been revised to include laser hybrid welding for duplex stainless steel. Previously only ISO standards were referenced. The relevant AWS standards have been added and standard AWS terminology will be used. Additional ASTM and ISO standards have been added. Qualification and quality control requirements have been added. ASME standards to which product has been certified have been added. 79 pages of largely third party test data in have been provided by Stainless Structurals in support of this ballot to document that products produced to this specification are capable of meeting the requirements of the referenced standards and Table 1. Due to its size, the ballot has been split into two parts with supporting letters and the changes to be balloted in this document. A PDF document with all the supporting information can be obtained from Lindsey Limone (llimone@astm.org), the technical contact or A01.17 chair, upon request. In order to avoid confusion, the scope has been modified to explicitly state that this standard covers austenitic, ferritic, and duplex (austenitic-ferritic) stainless steels since A240/A240M covers a wider range of alloy families. Other changes have been made to harmonize A1069 with other A01.17 specifications. This standard will continue to use A240/A240M, A276, A554 or A479/A479M for chemical requirements and Grade 1 strength levels. Since these products are used for structural applications, the term Grade means strength level not alloy type. The minimum mechanical property requirements for Grade 1 are those of A240/A240M, A276, A554 or A479/A479M. Higher strength levels are beneficial for structural applications and stainless steel plate is available with higher strength levels than shown in A240. The minimum requirements for three new strength Grades are defined in the new Table 1. The higher strength grade levels are justified by Stainless Structurals production data (see separate PDF) and data provided by a letter of support from North American Stainless (NAS), their primary supplier. The new mandatory table will allow structural engineers to fully utilize the strength of the most frequently ordered structural alloys purchased to this standard within each family to prevent unnecessary over design. During testing of the welded product there have never been test failures in the welds. The strength of the structural sections produced to this standard is determined by the plate because of the temperature control and rapid cooling in the narrow weld area. (See supporting data.) Three plate producers, North American Stainless (NAS), ATI Allegheny Ludlum and New Castle Stainless Steel Plate (NCSP) were consulted to determine reasonable minimum strength levels for the new austenitic Grade 2 and the duplex grades 3 and 4. All three agreed on the Grade 2 austenitic strength level up to 2.5 inches in thickness. All three can supply plate to the S32205 (2205) Grade 3 strength level, but there are some differences in maximum thickness with two able to supply this strength level up to the 2.5 inches in thickness. Both ATI and NCSP produce super duplex plate and agreed to the Grade 4 strength level up to 2 inches in thickness. There are therefore multiple suppliers of plate to these strength levels in the US alone. The stainless steels not explicitly identified in Section 7 and Table 1 as being available in Grades 2, 3, and 4 should be ordered to Grade 1.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    02-19-2019

    Technical Contact:
    Catherine Houska

    Item:
    043

    Ballot:
    A01 (19-04)

    Status:
    Ballot Item Approved as A1069/A1069M-2019 and Pending Publication