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The unique feature of Supreme ERS structure is that they are made of High strength steel instead of High Strength Aluminium. High strength steel has three times the specific gravity and yield strength of more than 2 times when compared with High strength Aluminium alloy. Another reason why High Strength steel is preferred over Aluminium is due to the wide spread usage of High Strength Steel in the transmission sector. India uses close to 1 million MT of High Strength Steel on towers alone. Rolling and Fabrication process of High Strength Steel is highly standardised and thus it is economical, functionally dependable and structurally stable option. The savings due to reduced outage time faroutweighs the cost of such ERS which is now substantially reduced due to use of steel.
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