Detailed Project Report on Hot Rolling Mill of Narrow Steel Strip

HOT ROLLING MILL OF NARROW STEEL STRIP

[EIRI/DPR/3656](J.C.: 6156)

INTRODUCTION

Mechanical working of a metal is simply plastic deformation performed to change dimensions, properties and surface condition by means of mechanical pressure. Mechanical working may be either hot working or cold working depending on temperature and strain rate such that recovery processes take place simultaneously with the deformation. Plastic deformation above recrystallisation temperature, but below the melting or burning point, is hot work. Some metals, such as lead and tin, have a low recrystalline range and can be hot worked at room temperature, but most commercial metals require some heating. Plastic deformation below the recrystallisation temperature is cold work. Although normal room temperatures are ordinarily used for cold working of steel, temperatures up to the recrystallisation range are sometimes used. In cold working, recrystallisation processes are not effective. It is, therefore, important to realise that the distinction between hot working and cold working does not depend upon any arbitary temperature, but also on the recrystallisation temperature, of deformation.

Hot Working

Hot working is the initial step in the mechanical working of most metals and alloys. Hot working combines the working and annealing processes by deforming metal above the recrystallisation temperature at which new grains are formed. Since most metals and alloys have relatively high recrystallisation temperatures, they must be worked at high temperatures. Each metal of course, has a characteristic hot-working temperature range over which hot working may be performed. The upper limit of working temperature depends on metal composition, prior deformation and impurities within the metal. Obviously, the upper limit for working must be somewhat below the melting or burning point. The finishing temperature, however, is usually just above the minimum recrystallisation temperature at which reheating is desired before further hot working.

In addition to mere change of shape, hot working has profound effects on metal characteristics or properties. These are listed under Table 6.1. The changes in structure from hot working improve mechanical properties such as ductility, toughness, elongation percentage, reduction of area percentage and resistance to shock and vibration.

COST ESTIMATION

Plant Capacity            16.67 MT/Day  

Land & Building (20,000 sq.mt.)    Rs. 41.00 Lac    

Plant & Machinery                    Rs. 1.15 Cr 

Working Capital for 3 Months    Rs. 3.59 Cr 

Total Capital Investment          Rs. 5.37 Cr 

Rate of Return                          37%

Break Even Point                      47%

CONTENTS

INTRODUCTION                                     

USES AND APPLICATIONS                            

PROPERTIES                                       

PRESENT MINI STEEL UNIT                          

B.I.S. SPECIFICATIONS                            

RAW MATERIAL REQUIREMENT                         

MANUFACTURING PROCESS                            

BLOCK DIAGRAM FOR ROLLING STRUCTURAL SHAPES      

ABOUT THE TOOL ROOM                              

PLANT LAYOUT                                     

SUPPLIERS OF PLANT & MACHINERIES                 

APPENDIX – A:

01. PLANT ECONOMICS

02. LAND & BUILDING

03. PLANT AND MACHINERY

04. OTHER FIXED ASSESTS

05. FIXED CAPITAL

06. RAW MATERIAL

07. SALARY AND WAGES

08. UTILITIES AND OVERHEADS

09. TOTAL WORKING CAPITAL

10. TOTAL CAPITAL INVESTMENT

11. COST OF PRODUCTION

12. TURN OVER/ANNUM

13. BREAK EVEN POINT

14. RESOURCES FOR FINANCE

15. INSTALMENT PAYABLE IN 5 YEARS

16. DEPRECIATION CHART FOR 5 YEARS

17. PROFIT ANALYSIS FOR 5 YEARS

18. PROJECTED BALANCE SHEET FOR (5 YEARS)