1. Scope

1.1 This specification covers grades of hot-formed welded and seamless high-strength low-alloy square, rectangrlar, round or special shape structural tubing for welded, riveted, or bolted construction of bridges and buildings and for general structural purposes. When the steel is used in welded construction, the welding procedure shall be suitable for the steel and the intended service.

1.2 Grade ケ has atmospheric corrosion resistance equivalent to that of carbon steel with copper (0.20 minimum Cu90grades Ia and Ib have atmospheric corriosion resistance substantially better than that of Grade ケ (Note1). When properly exposed to the atmoshere, Grades Ia and Ib can be used bare (unpainted) for many applications. Whten enhanced corrosion resistance is desired, Greade ゲ, copper limits may be specified.

Note 1-For methosd of esimating the atmospheric corrosion resistance of low ally steels see Guide G 101 or actual data.

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