06-04-2011, 10:10 AM
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THE STUDY ON MEDIUM MERCHENT STRUCTURAL MILL & HYDRALIC SYSTEMS IN MMSM
ABSTRACT
• Medium merchant structural mill is a high capacity continuous mill consisting of Re-heating furnace, 20 stands arranged in 3 trains.
• 5/2 Hydraulic cellar in MMSM finishing system having 4 hydraulic stations .
• Hydraulic station is having 20 no’s of positive displacement pumps, 12 no’s of cooling and filtering pumps, many control units.
MAJOR PRODUCTION UNITS IN
VIZAG STEEL PLANT
RAW MATERIAL HANDLING PLANT
• The Raw Material Handling Plant receives the basic raw materials .
• This unit is provided with elaborate unloading, blending, stacking and reclaiming facilities .
COKE OVEN AND COAL CHEMICAL DEPARTMENT
• Coke is manufactured by heating of crushed coking coal ( below 3mm) .
• Heating in the absence of air at temperature of 10000 c and above for about 16 - 18 hours .
BLAST FURNACE
• The Blast Furnace produces the hot metal at high pressure and temperature.
• VSP has two 3200cu.meters blast furnaces equipped with Paul worth Bell less top equipment with conveyor charging.
STEEL MELTING SHOP
• VSP produces steel employing three numbers of top blown oxygen converters .
• Each converter is having 133cu.mts volume capable of producing 3MT of liquid steel annually.
LIGHT AND MEDIUM MERCHANT MILL
• LMMM comprises of two units.
• In LMMM break down mill 250*320 mm size blooms are rolled into billets of 125*125 mm size after heating them in two nos. of walking beam furnaces of 200 TPH capacities each.
WIRE ROD MILL
• Wire rod mill is a 4 strand, 25 stands fully automated & sophisticated mill.
• The mill has a four zone combination type reheating furnace of 200 TPH capacity for heating billets at temperature of 12000C .
• ABOUT MEDIUM MERCHANT STRUCTURAL MILL
INTRODUCTION TO MMSM
• The MMSM is a single stand fully continuous rolling mill having an annual capacity of 8,50,000 Tones of Medium Merchant & Structural products.
• The important feature of this mill is that Universal Beams both parallel and wide flange beams are rolled by using four universal rolls to stands.
PRODUCTS &IT’S SIZES
• MILL PROPER:
• Roughing Mill: It consisting of 8 stands .
4 Horizontal ,2 Vertical &2 Combination stands with 630 mm dia.
• Intermediate mill: It consists of 6 stands.
2 Horizontal ,2 Combination with 630mm dia & 2 Horizontal stands 630 mm dia replaceable by two 1060/710 mm Universal stands.
• Finishing mill: It consists of 6 stands.
2 Combination stands 500mm dia,4 Horizontal stands 600mm dia replaceable by four 900/600 mm universal stands.