Answer / sjtbehera

Both are High yield strength steel deformed bar as per IS
1786 but the main difference is that Yield Stress or 0.2%
proof stress of fe 415 is 415 N/Sqmm and that of fe 500 is
500 N/sqmm. Fe415 is better for housing construction.

Rest of difference is given below:

1. Chemical composition:

Constituent/ Fe415 / Fe500

Carbon / 0.30 / 0.30
Sulphur / 0.06 / 0.055
Phosphorus/ 0.06 / 0.055
Sulphur & Phosphorus / 0.11 / 0.105

2. Elongation per cent,Min,on gauge length 5.65 sqrt( A)
where A is the cross sectional area of the test piece:

Fe415 :14.5
Fe500 :12.0

3.Tensile Strength,Min:

Fe415 :
10% more than the actual 0.2% proof stress but not less
than 485N/mm .sq
Fe500 :
8% more than the actual 0.2% proof stress but not less
than 545N/mm.sq

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