GST on Scrap sale

Manufacturing and sale of all kinds of iron and steel like iron rods, bars, and scraps of iron and steel etc are charged at the rate of 18%

You need to be more elaborate with what type of Scrap it is, It depends on what type of waste/scrap it is, What form it has , What it is made of etc. However mostly scrap falls under 18% unless it is of Precious metals then it will be 28% chargeable under GST.