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Asked: 2020-04-16T23:38:15+05:30 In:

BARC-6: Why Vacuum is used in Secondary Steelmaking? Explain using Thermodynamics?

BARC-6: Why Vacuum is used in Secondary Steelmaking? Explain using Thermodynamics?
BARC-6: Why Vacuum is used in Secondary Steelmaking? Explain using Thermodynamics?
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    8 Answers

    1. Copper

      In thermodynamic point of view: 1.we generally see That most of secondary steel making process done in vacuum why Beacuse., According to THE CLAUSIUS-CLAPEYRON EQUATION The transition temperature of metal (melting point) increase with pressure, and simillarly decrease with pressure So under vacuum,Read more

      In thermodynamic point of view:

      1.we generally see That most of secondary steel making process done in vacuum why Beacuse.,

      According to THE CLAUSIUS-CLAPEYRON EQUATION

      The transition temperature of metal (melting point) increase with pressure, and simillarly decrease with pressure So under vacuum, the melting point quit Low as compared to atmospheric pressure …

      So we require less heat supply to keep it as molten state..

      And also remove the dissolved gases in the molten steel  …

      Mistakes are acceptable.

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    2. Silver Metallurgical Engineering student

      We are using vaccum in secondary steel making to remove the gases like Hydrogen, Nitrogen and oxygen. If these gases present it will cause embrittlement in steel. So we have to eliminate them. To eliminate these gases we are using vaccum. By the vaccum these gases will be eliminated using siverts laRead more

      We are using vaccum in secondary steel making to remove the gases like Hydrogen, Nitrogen and oxygen. If these gases present it will cause embrittlement in steel. So we have to eliminate them. To eliminate these gases we are using vaccum.

      By the vaccum these gases will be eliminated using siverts law.

       

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    3. N->(1/2)N2 For degassing we use vacuum or low pressure as when we decrease pressure reaction proceeds in the direction with lesser number of moles i.e forward direction hence facilitating the degassing process.

      N->(1/2)N2

      For degassing we use vacuum or low pressure as when we decrease pressure reaction proceeds in the direction with lesser number of moles i.e forward direction hence facilitating the degassing process.

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    4. Silver

      It's based on the sieverts law. It states that the solubility of a diatomic gas in metal is proportional to the square root of the partial pressure of the gas in thermodynamic equilibrium. So, vaccum is used to reduce the partial pressure of the dissolved gases so that the elimination of these gasesRead more

      It’s based on the sieverts law. It states that the solubility of a diatomic gas in metal is proportional to the square root of the partial pressure of the gas in thermodynamic equilibrium. So, vaccum is used to reduce the partial pressure of the dissolved gases so that the elimination of these gases will become easier.

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    5. Gases like H, N2 and O2 are very deangerous for steel. The steel suddenly cracks during application  due to presence of this gases. We need to degassing after primary steel making by the vacuum. The vacuum is removes gases by the seavert's law. The seavert law states that the Dissolution of gases isRead more

      Gases like H, N2 and O2 are very deangerous for steel. The steel suddenly cracks during application  due to presence of this gases. We need to degassing after primary steel making by the vacuum. The vacuum is removes gases by the seavert’s law. The seavert law states that the Dissolution of gases is equals to the partial pressure of Di atomic gases. Degassing process done by the vacuum degasser.

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    6. Gold Metallurgist, Standard Provider (IS, ASTM, BS, ISO etc), Laboratory Equipment Suppliers,

      A Vacuum is used to reduce the concentrations of dissolved gases (H2, N2, O2) in the liquid steel; Homogenize the liquid steel composition and bath temperature; remove oxide inclusion materials from the liquid steel. As thermodynamic point of view, I think Vijay said a well.

      A Vacuum is used to reduce the concentrations of dissolved gases (H2, N2, O2) in the liquid steel; Homogenize the liquid steel composition and bath temperature; remove oxide inclusion materials from the liquid steel.

      As thermodynamic point of view, I think Vijay said a well.

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    7. Vaccum degassing is mainly done to reduce the amount of gases (such as Hydrogen, Oxygen, Nitrogen) which mainly responsible for defects generation in steel after casting. And also vaccum degassing helps to reduce inclusions in steel.

      Vaccum degassing is mainly done to reduce the amount of gases (such as Hydrogen, Oxygen, Nitrogen) which mainly responsible for defects generation in steel after casting. And also vaccum degassing helps to reduce inclusions in steel.

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    8. 2

      Simply, to create pressure difference for the removal of gases.

      Simply, to create pressure difference for the removal of gases.

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