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Home/Questions/Q 120416
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Ashish kumar pradhan
Ashish kumar pradhan
Asked: June 22, 20212021-06-22T06:15:39+05:30 2021-06-22T06:15:39+05:30In: Iron & Steel Making

in case of stainless steel making, while adding chromium how we protect cr from oxidation?

in case of stainless steel making, while adding chromium how we protect cr from oxidation?
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    1. Mayur Pandey
      2021-06-22T08:18:41+05:30Added an answer on June 22, 2021 at 8:18 am

      By adding chromium as ferro Chrome we restrict oxidation of chromium .

      By adding chromium as ferro Chrome we restrict oxidation of chromium .

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    2. Kathirvelan R Silver Learner
      2021-06-23T21:16:34+05:30Added an answer on June 23, 2021 at 9:16 pm

      Ferrochrome, which contains about 55 to 70% chromium is the principal source of chromium. This ferroalloy can be classified into various grades, based primarily on their carbon content, such as: 1)Low carbon ferrochrome (about 0.1% C). 2) Intermediate carbon ferrochrome (about 2% C). 3)High carbon fRead more

      Ferrochrome, which contains about 55 to 70% chromium is the principal source of
      chromium. This ferroalloy can be classified into various grades, based primarily on their carbon
      content, such as:
      1)Low carbon ferrochrome (about 0.1% C).
      2) Intermediate carbon ferrochrome (about 2% C).
      3)High carbon ferrochrome (around 7% C).
      Amongst these grades, the high carbon variety has the drawback that though it is the least expensive, it raises the carbon content of the melt. This is undesirable, since all SS grades demand carbon contents less than 0.03%. As per Ellingham diagram , chromium forms stable oxides. Hence, the removal of carbon from the bath by oxidation to CO is associated with the problem of simultaneous oxidation of chromium in molten steel. The higher the temperature, the greater is the tendency for preferential oxidation of carbon rather than chromium. From this point
      of view, higher bath temperatures are desirable; however, too high a temperature in the bath gives rise to other process problems.
      The dilution of oxygen with argon lowers the partial pressure of CO, which helps in
      preferential removal of CO without oxidising bath chromium. Attempts were made to use this in the EAF, but the efforts did not succeed. Hence, as is the case with the production of plain carbon steels, the EAF is now basically a melting unit for stainless steel production as well.
      Decarburisation is carried out partially in the EAF, and the rest of the carbon is removed in a separate refining vessel. In this context, the development of the AOD process was a major
      breakthrough in stainless steelmaking.

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