All the raw material from China big steel mills, are unused steel products spare material and leftover material , no oil, no protective film, no impurities, which are high quality raw material for intermediate frequency furnace, 20 and 30 kg of small packaging are more suitable for small intermedium frequency furnace,and it can be directly converted into molten steel. We can provide the list and data of each transaction tested by NITON or Olympus spectral analyzer, and guarantee the detection rate of the product to be 100%