Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel
|Publication Date:||1 March 2007|
|ICS Code (Heat-treatable steels):||77.140.10|
This specification covers five grades of high-strength low-alloy structural steel shapes, plates, sheet piling, and bars. Grades 42 , 50 , and 55  are intended for riveted, bolted, or welded structures. Grades 60  and 65  are intended for riveted or bolted construction of bridges, or for riveted, bolted, or welded construction in other applications.
For applications, such as welded bridge construction, where notch toughness is important, notch toughness requirements are to be negotiated between the purchaser and the producer.
Specification A 588/A 588M shall not be substituted for Specification A 572/A 572M without agreement between the purchaser and the supplier.
The use of columbium, vanadium, titanium, nitrogen, or combinations thereof, within the limitations noted in Section 5, is required; the selection of type (1, 2, 3, or 5) is at the option of the producer, unless otherwise specified by the purchaser. (See Supplementary Requirement S90.)
The maximum thicknesses available in the grades and products covered by this specification are shown in Table 1.
When the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service is to be utilized. See Appendix X3 of Specification A 6/A 6M for information on weldability.
The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system is to be used independently of the other, without combining values in any way.
The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements.
For structural products produced from coil and furnished without heat treatment or with stress relieving only, the additional requirements, including additional testing requirements and the reporting of additional tests, of A 6/A 6M apply.
*A Summary of Changes section appears at the end of this standard.