Download GTU BE/B.Tech 2018 Winter 5th Sem New 2152108 Steel Making Question Paper

FirstRanker.com

GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018

--- Content provided by‍ FirstRanker.com ---

Subject Code:2152108 Date:07/12/2018
Subject Name:Steel Making
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:
1. Attempt all questions.

--- Content provided by FirstRanker.com ---

2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) What is the basic difference between steel making and iron making? 03
(b) Name various Integrated and Mini Steel Plants in India. 04
(c) With the help of schematic show different routes of steelmaking. 07

--- Content provided by FirstRanker.com ---

Q.2 (a) Discuss briefly Basic Oxygen Furnace (BOF). 03
(b) Explain in brief, the effect of Sulphur, Phosphorous in Steel. 04
(c) Explain: Reaction at slag metal interface. 07

OR

(c) Explain briefly (i) Carbon Reaction, (ii) Phosphorous Reaction, (iii) 07

--- Content provided by FirstRanker.com ---

Silicon Reaction, (iv) Manganese Reaction, (v) Sulphur Reaction.

Q.3 (a) List the purposes of secondary steel making. 03
(b) Discuss the main requirements of “Deoxidizer” in steel making. 04
(c) Explain construction & working principle of single nozzle oxygen lance 07
with neat sketch.

--- Content provided by‍ FirstRanker.com ---

OR

Q.3 (a) What is tundish metallurgy? Briefly explain. 03
(b) What are the effects of inclusions on mechanical properties of steel? 04
(c) Explain AOD process in detail. 07

Q.4 (a) What are the environmental issues related to steel making? 03

--- Content provided by FirstRanker.com ---

(b) Calculate the p co2/ p co ratio in aCO-CO2 gas mixture at equilibrium withp o2 04
=10^-7 atmosphere at 1600°C
. Standard free energy of formation (J. mol^-1) of some compounds as a function
of temperature (at the indicated temperature range)

Reaction Temperature, K A, J . mol^-1 B, J . mol^-1.K^-1

--- Content provided by‍ FirstRanker.com ---

C(gr) + (1/2)O2(g) = CO(g) 1500-2000 -111800 -87.65
C(gr) + O2(g)=CO2(g) 1500-2000 -394200 -0.84

(c) Explain Ladle Furnace principle for secondary refining with neat sketch. 07

OR

Q.4 (a) With figure briefly explain R-H degasser. 03

--- Content provided by​ FirstRanker.com ---

(b) A slag of CaO, SiO₂ and Al₂O₃, having mole fraction of alumina as 0.15, 04
has SiO₄^4-, AlO₄^5- anions. Calculate the slag composition.

(c) Compare and contrast AC and DC electric arc furnace. 07

Q.5 (a) Calculate the activation energy for viscosity for a liquid slag, whose 03
viscosities are 10 and 2 kg.m^-1.s^-1 at 1510 and 1610°C respectively.

--- Content provided by‍ FirstRanker.com ---

(b) Explain VOD process. 04
(c) List the types of Continuous-Casting (C.C.) machines and explain any one. 07

OR

Q.5 (a) A liquid slag has 50 wt. % CaO, 10 wt. % MgO, 25 wt. % SiO₂, and 15 03
wt. % Al₂O₃.

--- Content provided by​ FirstRanker.com ---

Calculate its sulphide capacity at 1900 K with the help of the following
equation:

Log Cs=3.44 ( Xcao + 0.1 Xmgo — 0.8 X Al2O3 — X Sio2) — 9894/T +2.04

(b) List the ingot defects and give their remedies. 04
(c) List the defects in Con-cast products & Discuss briefly about Near Net 07

--- Content provided by FirstRanker.com ---

Shape casting.

FirstRanker.com