Work Item
ASTM WK75029

New Specification for Carbon Steel Laser and Laser-Hybrid Welded, Sharp-Cornered Profile (SCP), Built-Up, Square, Rectangular, and Special Shape Tube

1. Scope

The promotion of knowledge, the stimulation of research, and the development of specifications, test methods, terminology, and other types of standards relating to cast or wrought steels, stainless steels and related alloys and ferrous alloys.

Areas of Interest: The Committee's interest includes the following materials: carbon and alloy steels, tool steels, tin mill products, corrosion and heat-resistant alloys, super-strength alloys, and clad steels.
The Committee, unless specifically requested by the Chairman of the Committee having prime responsibility, is not concerned with materials which are the interest to Committees; A06 on Magnetic Properties, B02 on Nonferrous Metals and Alloys, B04 on Metallic Materials for Thermostats and for Electrical Resistance, Heating, and Contacts; and F04 on Surgical Implants.

The Committee specifically excludes the following areas of interest:
* Aluminum-coated, zinc-coated, or terne-coated steel products covered by Committee A05.
* Alloys in those forms for which the principal use results from specifically controlled electrical resistance, thermal expansion, or magnetic characteristics which pertain to electrical resistance devices, electrical contacts, thermostats, and electrical steel.
* Materials for surgical implants.

Policy on Material Specification Coverage: The material specifications prepared by the Committee are available for use by producers and users anywhere in the world. To maintain a practical limit to the amount of committee effort, the Committee will prepare and administer specifications within its expertise. Requests for new specifications or standards or for new grades or types of material should be supported by a regulatory body, a code-writing body or a member of ASTM.

Keywords

rectangular tube; square tube; special shape; sharp cornered; built-up; laser weld; laser-hybrid weld; fusion welding; carbon steel; AESS; SCP; architectural steel; architectural steel profiles.

Rationale

This is the second ballot. Changes were made as the result of a review by an ASTM Editor and in response to 1 persuasive negative (weight limit removal - discussed in sub) and 3 affirmatives with comment. The changes based on the comments were editorial or added clarity and added inspection requirement details from the referenced standards for the convenience of users. ASTM A606 was not added, as most are not laser weldable.

In the scope of AWS D1.1, it states, “This code contains the requirements for fabricating and erecting welded steel structures,” but it does not cover dedicated production methods for structural shapes. Architectural and industrial applications are increasingly using short runs of precision, built-up, sharp cornered profile (SCP), laser, and laser hybrid steel tube products from dedicated production lines, particularly when aluminum does not satisfy the structural requirements. SCP steel tube sections are used when the round corners of standard tubular products do not satisfy the dimensional requirements. The applications include life safety critical curtain wall, window mullion, egress stairs, and industrial applications. The abbreviation SCP is commonly used when specifying this product.

In a series of emails in 2019, Mr. Ehlert of Novum Structures, a fabricator who purchases the product, communicated the need for this ASTM standard, while mentioning that a standard already exists for laser and laser hybrid welded stainless steel (ASTM A1069/A1069M). His firm provided a letter of support, feedback on draft development, and has requested the addition of Canadian Standards Association CSA W47.1. U.S., Canadian, and European fabricators and U.S. and European manufacturers are formally requesting this standard and there have also been requests from structural engineers using this product. European and U.S. manufacturers of this product, Montanstahl, and Stainless Structurals significantly contributed to the draft. Additional fabricators who purchase SCP steel, specifically TriPyramid, Feature Walters, Haskell, Newport Industrial Fabrication, Sentech, Seele, Roschmann Group, and Mistral Architectural Metal & Glass, have written letters of support.

Currently, some are specifying carbon steel to ASTM A1069/A1069M, which is for laser and laser hybrid welded stainless steel because of the lack of a carbon steel standard, which is problematic. ANSI/AISC 360 provides the expected weld design strength but does not limit the welding methods that can be used for SCP products or establish quality requirements. Simply referencing AWS D1.1, ISO, or CSA W47.1 (Canada) is not sufficient to define the requirements for SCP tube. This standard will fill the existing specification gap.

The stainless steel standard, ASTM A1069, was used as the starting point for this draft. The ISO, CSA, and AWS standards for laser and laser hybrid operator and process qualification apply to all steels and, since users of the standard may not have these documents for reference but may want to understand their requirements, they have been summarized in Appendix X2. Referencing them avoids a conflict between standards and unnecessary standard length while capitalizing on standard-setting body expertise. While these standards set welding qualification requirements, final product dimensional tolerances, inspection, and other requirements are equally important in producing a high-quality structural shape.

Because this is a short run, customized product, some of the requirements for large production runs of carbon steel tube are not applicable such as continuous identification marking. Raw material is purchased to the chemistry requirements of other standards. Custom laser and laser hybrid carbon steel structural shapes other than tube are purchased so a nonmandatory appendix provides guidance for specifiers of these products since it has been determined that there is currently no A01 subcommittee that is an appropriate fit for a standard covering these products.

The title and scope are in draft form and are under development within this ASTM Committee.

Details

Developed by Subcommittee: A01.09

Committee: A01

Staff Manager: W Scott Orthey

Work Item Status

Date Initiated: 12-02-2020

Technical Contact: Catherine Houska

Item: 001

Ballot: A01.09 (22-02)

Status: In Balloting

Item: 001

Ballot: A01.09 (21-05)

Status: Will Reballot Item

Item: 001

Ballot: A01.09 (21-06)

Status: Will Reballot Item