1.1 This specification covers chromium, chromium-nickel, and chromium-manganese-nickel stainless steel plates, shapes, bars, tubing, bolting, pipe, and sheet for use in fixed and movable bridges and transportation structures and other general construction applications. 1.2 Units--The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.3 This specification is expressed in both inch-pound and SI units. Unless the purchase order specifies the applicable M specification designation in which SI units are mandatory, the stainless steel shall be dimensioned and furnished in inch-pound units. 1.4 There are significant differences in the properties and corrosion resistance of the stainless steels included in this specification. Before specifying any of the stainless steels listed in this specification for a particular transportation application, the user should consult the technical literature to determine the mechanical and physical properties of the selected alloy; whether its corrosion resistance is suitable in surrounding or operating media and prevalent stress range; its availability in a particular form, shape, finish, or condition; and, if applicable, its country of origin. 1.5 Welding of the stainless steels contained in this specification shall be in accordance with the requirements of AWS D1.6/D1.6M Structural Welding CodeStainless Steel. When the stainless steel is to be welded or joined to carbon steel or another metal, a welding procedure shall be used that is compatible with the chemical compositions involved and the intended use of service. Retesting of mechanical properties shall be considered following welding procedures. NOTE 1--Weldability of most stainless steel alloys is generally good. However, pre-weld or post-weld procedures or both are necessary for martensitic grades that generally require preheat temperatures in the range of 400 to 600F (200 to 400C) for section thickness greater 1.00 in. (25 mm) and carbon contents above 0.03 %. The extent of change of post-weld properties depends upon the stainless steel composition and the required welding process parameters. 1.5 This standard does not purport to address all of the safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. CAUTION--Users of this standard are cautioned that some austenitic stainless steels exhibit stress-corrosion cracking when operating stresses are near yield strength in aqueous chloride environments and at temperatures that routinely exceed 120F (50C). Duplex stainless steels are more resistant to stress corrosion cracking in chloride environments than some of the more susceptible austenitic stainless steels. This warning primarily applies to structures in warm coastal areas that are subject to continual salt fall and have high dead load stresses.
Keywordsplates; shapes; bars; tubing, bolting pipe, sheet; corrosion resistance; stainless steel; austenitic; duplex; martensitic, precipitation hardening; bridges; structures; transportation
This specification is a companion standard to ASTM A709, Structural Steel for Bridges, which only contains references to low alloy and carbon steels. ASTM has always kept stainless steel specifications separate from those of low alloy and carbon steels. Bridge designers and transportation engineers prefer to have a single standard whereby they can select the appropriate stainless steel for various structural components.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
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