This standard is issued under the fixed designation A 847; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ュ) indicates an editorial change since the last revision or reapproval.

1. Scope
1.1 This specification covers cold-formed welded and seamless high-strenght, low-alloy round, square, rectangular, or special shaped structural tubing for welded, riveted, or bolted construction of bridges and buildings and for general structural purposes where high strength and enhanced atmo-spheric corrosion resistance are required (Note 1). The atmospheric corrosion resistance of this steel in most envi-ronments is substantially better than carbon steel with or without copper addition (Note 2). When properly exposed to the atmosphere, this steel can be used bare (unpainted) for many applications. When this steel is used in welded construction. the welding procedure shall be suitable for the steel and the intended service.

1.2 This tubing is produced in welded sizes with a maximum prriphery of 64 in. (1626 mm) and a maximum wall of 0.625 in. (15.88mm), and in seamless with a maximum periphery of 32 in. (813 mm) and a maximum wall of 0.500 in. (12.70mm). Tubing having other dimen-sions may be furnished provided such tubing complies with all other requirements of this specification.

1.3 The values stated in inch-pound units are to be regarded as the standard.

NOTE 1-Products manufactured to this specification may not be suitable for those applications where low temperature notch toughness properties may be important, such as dynamically loaded elements in welded stuctures, etc.

NOTE 2-For methods of estimating the atmospheric corrosion resistance fo low alloy steels see Guide G 101 or actual data.