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Q 4. Should high Strength steel be used for Tower manufacture ? 

Ans: To achieve desired strength of tower, use of HSS(High Strength Steel) instead of normal mild structural steel will result in lighter tower ( Not necessarily cheaper tower because of cost differential of normal mild structural steel and HSS).

Reduction in weight may be very important in certain applications e.g. airplanes, motor cars etc.

In such applications, irrespective of the initial cost, low weight results in low operational cost.

In case of towers, operational costs do not depend on weight of tower.

Hence no special advantage is obtained by using HSS. HSS is normaly used by manufacturer to achieve cost savings .