<a href="http://www.lefinsteel.net/hollow-section/steel-hollow-section/" target="_self">Steel hollow section</a> also known as structural steel tube and hollow structural sections (HSS) is a type of steel that is formed into a hollow tubular section. Steel hollow sections are commonly used in welded frames, columns and as beams providing various benefits to a range of construction and mechanical applications.
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<a href="http://www.lefinsteel.net/steel-pipe/" target="_self">Steel pipe</a> is the long, hollow tube that is used for a variety of purposes. It is produced by two distinct methods which result in either a welded or seamless pipe. In both methods, raw steel is first cast into a more workable starting form.