Podcast
Questions and Answers
What is the main advantage of using ferrochrome alloys in steel production?
What is the main advantage of using ferrochrome alloys in steel production?
- Increases the steel elasticity and hardness (correct)
- Improves the machinability of steel
- Acts as a deoxidizer during steelmaking
- Enhances the magnetic properties of steel
Which of the following statements about chromium is correct?
Which of the following statements about chromium is correct?
- It has a high specific gravity of 12.5
- It forms a solid solution with iron and an intermetallic compound FeCr (correct)
- It is primarily used as a deoxidizer in steelmaking
- It has a low melting point of 1200°C
Which of the following is a key property of the FeCr intermetallic compound?
Which of the following is a key property of the FeCr intermetallic compound?
- It improves the machinability of steel
- It causes the steel to gain passivity against corrosion (correct)
- It enhances the magnetic properties of steel
- It increases the electrical conductivity of steel
In the production of carbon ferrochrome, what is the primary function of carbon?
In the production of carbon ferrochrome, what is the primary function of carbon?
Which of the following statements about slag formation in ferrochrome production is correct?
Which of the following statements about slag formation in ferrochrome production is correct?
What is the primary difference between carbon ferrochrome and low-carbon ferrochrome?
What is the primary difference between carbon ferrochrome and low-carbon ferrochrome?
Which of the following statements about carbides in ferrochrome alloys is correct?
Which of the following statements about carbides in ferrochrome alloys is correct?
What is the primary purpose of adding silicon to ferrochrome alloys?
What is the primary purpose of adding silicon to ferrochrome alloys?
In the production of low-carbon ferrochrome, what is the primary method used to reduce the carbon content?
In the production of low-carbon ferrochrome, what is the primary method used to reduce the carbon content?
Which of the following statements about the use of ferrochrome alloys in steel production is correct?
Which of the following statements about the use of ferrochrome alloys in steel production is correct?
Flashcards are hidden until you start studying
Study Notes
Production of Carbon Ferrochrome
- Increasing the process temperature helps to decrease heat losses during continuous charging in a patch type furnace.
Raw Materials and Power Consumption
- Chrome ore: 77-78% with a grain size of 50-60 mm
- Reducer: 14-20% Nut-coke with a grain size of up to 25 mm
- Quartzite: 2-3% with a grain size of 30-50 mm, used as a fluxing material
- Iron chips: 5-15% of the charge
- Electrod mass: 27-30 kg/ton alloy
Reduction of Oxides
- Oxides contained in the ore are reduced by carbon at a temperature of 1240°C
- Reduction of chrome oxide by carbon: Cr2O3 + 3C = 2Cr + 3CO, ∆H = + 195510 Cal
- Stable carbides are formed during the reduction of chrome oxide by carbon at a temperature of 1129°C: Cr2O3 + 27/7 C = 2/7Cr7C3 + 3CO, ∆H = + 182919 Cal
- Reduction of iron oxide: FeO + C = Fe + CO
Uses of Ferrochrome Alloys
- Used for alloying and not for deoxidation
- Improves the mechanical and chemical properties of steels
- Increases the steel's elasticity and hardness
- Increases the chemical corrosion resistance for seawater
- Increases the acid resistance with Si addition
Physicochemical Properties of Chromium
- Atomic weight: 52
- Melting point: 1930°C
- Specific gravity: 7.19
- Boiling point: 2470°C
- Forms solid solutions with Fe and intermetallic compound (FeCr) of 13% Cr, which causes the steel to gain passivity against corrosion
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
