ASTM A500 has been the preferred material specification in the United States for cold formed, welded carbon steel hollow structural sections (HSS) since the late 1970s. In April of 2013, a new material specification, ASTM A1085, was released for steel tubes used in structural applications.
See the below link for download
https://www.dropbox.com/s/psicoq0jg3ymdpf/hss-flyer.pdf?dl=0
Courtesy:www.aisc.org & internet
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