JNTU Steel Making Exam Paper Apr- May 2008

JNTU B.Tech II Semester Examinations, STEEL MAKING, Apr/May 2008

(Metallurgy & Material Technology)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

SET-II

1. (a) Compare and contrast ancient processes of steel making with modern processes with reference to process and equipment.

(b) Explain how the following factors affect the efficiency of steel making operation:

i. Energy consumption

ii. Cost of raw-materials used. [10+6]

 

2. Explain

(a) Molecular theory and

(b) Ionic theory of refininng of slags in steel making process. [16]

 

3. Discuss the construction and operatiional features for the following

(a) Twin hearth furnace

(b) Tilting open hearth furnace. [8+8]

 

4. What is L.D process? With the help of a neat sketch explain the steel making by L D process. What are the advantages and limitations of this process over other methods of steel making. [16]

 

5. (a) What are the types of electric heating ?

(b) What are the advantages and disadvantages of using electric energy as a source of heat ?

(c) Classify the Electric Arc Furnace processes. [4+6+6]

 

6. Describe the following with figures :

(a) Teeming Ladle

(b) Stopper assembly

(c) Ladle lining [6+6+4]

 

7. (a) What is secondary steel making ? Classify the various processes.

(b) What are the aims of secondary steel making ?

(c) Discuss stirring treatments in secondary steel making processes. [5+5+6]

 

8. (a) What is the principle of moving mould ? What are its modifications and its beneficial effect?

(b) What are the metallurgical aspects of continuous casting of steel ? [8+8]

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