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Steel products supplied by structural steel contractors are steel ingots, cast slabs and cast directly into a variety of steel castings. Generally speaking, steel, generally refers to the rolling into a variety of steel steel. Steel is black metal but steel is not exactly equal to ferrous metal.
As a result of the construction of steel structures created by structural steel contractors at high altitudes, operators are faced with a wide range of risks when walking or operating on steel beams or gauges. The risk of falling is the greatest risk and the consequences are the most serious. In order to ensure the safety of the aerial workers, in the construction process to take a temporary installation of a series of wire grid lines in the steel structure of the high-altitude operation, this temporary installation of the rope called "lifeline.