Reconciliation of steel

Reconciliation of steel

 

  • Length of one rod from each diameter is to be measured and written in Stock Register.

 

  • Weight of rods vary from the standard weight.

 

  • Calculating the weight of steel based on the sample unit weight is necessary to avoid manipulation by the Supplier.

 

  • This actual weight of steel is required for the periodical Reconciliation of Steel.

 

  • Say, for example

100 MT of 16mm Ø bars of Fe500 grade are required to procure. Assume the weight of bar received is 1.63 kg/Rm.

⇒ Total Weight of Steel received  =  100,000 kg

⇒ Standard Weight of Steel  =  1.58 kg/m

⇒ ∴ Length of Steel received  =  100,000 / 1.63  =   61,349.693 m

⇒ But the length of Steel as per Standard weight  =  100,000 / 1.58  =  63,291.139 m

⇒ Loss of Weight  =  ( 1.63 – 1.58 ) / 1.58  =  3.16 %

This is the Rolling Margin in Reinforcement Steel.

The Allowable deviation in Rolling Margin in R/f Steel ( IS 1786 ) :

8 mm to 10 mm     :     ± 7.0 %

12 mm to 16 mm    :     ± 5.0 %

20 mm & above      :     ± 3.0 %

⇒ Weight computed by measurement & Standard weight

                          = 61,349.693  x  1.58  =   96,932.50 kg

⇒ Loss of Weight   =  100,000  –  96,932.50  =  3067.50 kg