Name of the University : Jadavpur University
Department : Metallurgical Engineering
Degree : B.E
Subject Name : Steel Making
Year/Sem : III/II
Website : jaduniv.edu.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/5461-STEEL%20MAKING.pdf
Steel Making Question Paper :
Bachelor Of Metallurgical Engg. Examination, 2010 :
(3rd Year, 2nd Semester)
Time : Three hours
Related : Jadavpur University Technology of Non-Ferrous Metals & Non-Metallic Materials B.E Question Paper : www.pdfquestion.in/5460.html
Full Marks : 100
(50 marks for each part)
Use a separate Answer – Script for each part. :
PART ** I :
Answer questions No. 1 & any three from the rest. :
1. a) ‘A’ & ‘B’ are two steel making companies, with the following data. Company ‘A’ has a no. of 90 ton electric arc furnace (EAF), ladle furnace (LF) & 3 no. of billet casters with 4 strands each.
Company ‘B’ has a no. of 20 ton coreless induction fournace (IF), LF & 2 no. of billet casters with 3 strands each. The charge mix of EAF is 60% DRI & rest steel scrap and that of IF is 10% DRI & rest steel scrap. Operating days for steel melt shop is 320 for both the companies.
The yield of billet caster is 99% for company ‘A’ and 97% for company ‘B’. For both the cases the yield of L.F = is 99.5%
Calculate:
** Number of EAF & IF for two companies.
** Billet production for both the companies and their net sales realisation
** Ratio of raw material cost of the two companies.
Data Given :
Tap to tap time for EAF & IF are 90 min & 120 min respectively
For company ‘A’ casting speed is 3.25 m/min & casting time is 70 min.
For company ‘B’ casting speed is 2.8 m/min & casting time is 72 min.
The billet size is 130 mm X 130 mm
Cost of DRI is Rs. 16000/ton & that of steel scrap is Rs. 19,000/ton
Selling price of billet is Rs. 25,000/ton
Metallic yield of EAF is 90% & that of IF is 88%
2. Answer to the followings 3×3
a) Differentiate between
** Vertical -type & S – type Continuous Casting Machine
** Dry Slag & Wet Slag
** AC Electric Arc Furnacs & DC Electric Arc Furnace
b) State the role of hot metal composition in selection of Bessemer steel making processes. 3
3. Answer to the followings ( any three)
a) Write short note on KALDO process. 3
b) What is Ladle Furnace? State the uses of it. 3
c) State the advantages & disadvantages of induction
Furnace over conventional Electric Arc Furnace. 4
d) State the advantages of using lime over limestone in steel making. 2
4. Describe a conventional Electric Arc Furnace covering the following items : 3+3+3+3
Furnace Description
Charging, Melting & Arcing
Refining
Desulphurisation
5. How the metal-slag-gas emulsion is formed in LD convertor. State the relation between emulsion formation & decarburisation in refining in LD convertor State the importance of secondary steel making. Write short notes on segregation in steel ingot. 2+4+3+3
PART ** II :
Answer All questions. :
6. a) What do you mean by oxidizing potential of slag ? How it affect dephosphorization ? Explain. 5
b) What is Flood’s theory of slag ? Explain with the help of ‘Mn’ reaction. 5
c) Is there any effect of PCO on C ** O refining reaction? Explain the limitation of C level during refining in B.O.F. 5
7. a) ‘What is the effect of base oxides on ‘P’ reaction ?Explain on the basis of Flood’s theory. 5
b) Give ‘S’ refining reaction during steel making. Show the effect of FeO on Ds index. How can you produce extra low ‘S’ steel ? 5
c) Is Mno behaviour will remain same for basic and acid slag? Explain with reference to (Mno)sn/ [Mn] meta
Syllabus :
Steel Making :
Introduction to steel making. Thermodynamic principle of steel making. Applications of alternative standard states and interaction coefficients in steel making problems.Slag theories.
Conventional steel making process : Bessemer, Open Hearth, Electric, Arc, and modified conventional process Basic oxygen Furnace Process: LD, Kaldo and Rotor, LDAC, OBM and Combined Blowing /Bath Agitated, Other recent processes.
Secondary steel making : deoxidation, desulfurization and degassing. Solidification of steel-Ingot defects (inclusions, blowholes, segregations etc.) and remedies. Continuous casting.