Answer Posted / deepak alane

as per environmental conditions
for Fe. 415:-
m20:- 48* d
m25:- 41*d
m30:- 38*d
m35:- 34*d
m40& above :- 30*d

for fe 500 (tmt)
m20:- 57*d
m25:- 49*d
m30:- 46*d
m35:- 40*d
m40& above :- 36*d

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