52nd ROLLING MILLS OPERATING COMMITTEE MEETINGCOMMITTEE MEETING

ONON

14 02 2019 & 15 02 201914.02.2019 & 15.02.2019

ATAT

BSL SAILBSL ,SAIL

LAYOUT HSM RSPLAYOUT HSM ,RSP

PRODUCT SIZEPRODUCT SIZE• Input Slab Size

THICKNESS 180 – 220 mm

WIDTH 750 – 1450 mm

• Strip SizeLENGTH 6500‐8700 mm 

• Strip SizeTHICKNESS 1.9 – 11.8 mm

WIDTH 725 1450 mm

• Coil Size

WIDTH 725 – 1450 mm

Coil SizeINNER DIAMETER 762 mm

OUTER DIAMETER 1200 ‐ 1800 mmOUTER DIAMETER 1200 1800 mm

WEIGHT 16.5 T (max.)

P d t iProduct mix

CRNO•ERW, SWPP, 

•JACKAL,• HR plates, 

/•SAILCOR,• SAILSOFT, 

•Chequered Coil/Plates,  •LPG

TECHNO – ECONOMIC PARAMETERS , HSM , RSP

PARAMETER UNIT target 2017‐18 2018‐19(Apr‐’ )Dec’18)

Availability % 85.3 91.46 86.84

Utili ti % 78 0 76 13 78 64Utilization % 78.0 76.13 78.64

Rolling Rate t/hr 291 276 277

Yield % 97 7 97 71 97 27Yield % 97.7 97.71 97.27

Specific heat consumption Kcal/kg 344 328 330p

Specific power consumption KWh/t 85 84.97 84.49

Specific roll consumption Kg/t 0.75 0.721 0.645

S ifiSpecific lubrication consumption

l/t 29 28.92 29.26

cobble % 0.33 0.25 0.32

IMPROVEMENT IN OPERATING PRACTICES IN HSM, RSP

• Modification of Finishing Mill Entry Guides by Additional Short StrokeAdditional Short Stroke 

• Simplifying logistics & facilitating hot charging at higher temperaturehigher temperature

• Roll bite lubrication for improved roll consumption• Auto marking of coils and individual coil tracking• Auto marking of coils and individual coil tracking improved coil dispatch

• Installation of amiad Auto water filter• Installation of amiad Auto water filter• Commissioning of ABB drive in down coilerR d ti i hi ti b ti i i d ft• Reduction in roughing time by optimizing draft schedules in roughing mill (R#0, R#1, R#2)

IMPROVEMENT IN THE SURFACE QUALITY OF THE STRIP 

Descaling Practice :

Primary descaling Primary descaling

R#1 descaling

R#2 descaling

Scale Washer Pinch Roll Descalingg

USE OF COILBOX TECHNOLOGYUSE OF COILBOX TECHNOLOGY

C il bC il b Ad tAd tCoil box Coil box ‐‐ AdvantagesAdvantages

• Reduce temp. drop of head & tail of transfer bbar

• Reduce effective length between roughing toReduce effective length between roughing to finishing mill

• Decrease energy consumption in finishing mill• Improve product quality• Improve product quality

NEW HOT STRIP MILL2250 mm New Hot Strip Mill

NEW HOT STRIP MILL

3 million T/year Input Slab

2.94 million T/year HR Coil

Mi bi hi C i L&TMitsubishi Corporation, L&T,    

…Primetals & Hitachi

Level II Automation

Thickness : 1.2 – 25.4 mmWidth : 725 2150 mmWidth : 725 ‐ 2150 mmCoil Wt.(max) : 35 T

OVERVIEW OF MILL3. Advanced Down Coiler1. Heavy Duty Roughing Mill withHot Run Start : 2019. MAY.

OVERVIEW OF MILL1) New QOC with Non-step

expanding mandrel2) Fixed type DC

3. Advanced Down Coiler1. Heavy Duty Roughing Mill with Hyd. AWC Attached Edger

- Full Hydraulic Roll Gap Adjust Cyl. with AWCEasier Maintenance

Production capacitySteel Grade

3.0 million tons/yearCarbon steel, Low alloy steel, Pipe steel, IF Steel, DP &Trip steel

Production Data::

Superior Coiling Performance and Stable Operation for longer time

- Hydraulic Gap Control Cyl. Located on Bottom・ Fine leveling and zeroing calibration・ Proper Pass Line Adjust

Strip ThicknessStrip Width

1.2 mm to 25.4 mm725 mm to 2,150 mm

::

HeatHeat

FSBFSB4Hi4Hi‐‐RMRM

HSBHSB

Heat Heat HoldingHoldingCoverCover

Edge HeaterEdge Heater (Future)(Future)

#3 DC #3 DC (Future)(Future)

Crop ShearCrop ShearReheating FurnaceReheating Furnace Slab Sizing PressSlab Sizing Press

(Future)(Future)

Crop ShearCrop Shear

2. Advanced Finishing Mill

- F1-F4 Stand : Advanced PC Mill

Reheating FurnaceReheating Furnace300 ton/Hr300 ton/Hr××2+1(2+1( Future)Future)

Slab Sizing PressSlab Sizing Press(Future)(Future)

・ Higher Strip Crown Control Capacity・ Prevention of Mill Vibration by Mill Stabilizer (MSD)

- F5-F7 Stand : WR Shift・ Roll Wear Dispersion・ Roll Wear Dispersion

SLAB YARDSLAB YARD Slab yard has two bays Slab yard has two bays Slabs from Casters to be stored in stacks of 12 slabs (max) Slab yard‐1 ‐ 30m x 213m, 2nos. 150T crane (lifts 3‐slabs at a time) Slab yard 1 30m x 213m, 2nos. 150T crane (lifts 3 slabs at a time) Slab yard‐2 ‐ 36m x 240m, 1 no. 150T crane, 1 no. 40/10T crane and 1no. 40/10T

semi‐gantry crane for charging slabs to furnace entry table.

Slab Yard

REHEATING FURNACEREHEATING FURNACE 2 Reheating furnaces – 300 T/Hr capacity (based on cold slabs) 1 Reheating furnace provision for future Walking beam type furnace ill i h i d i h l f l Furnace will run on either mixed gas or with alternate fuel as HFO Slabs coming out of furnace passes through Heavy Scale breaker (HSB),

water jet pressure of approximately 250barwater jet pressure of approximately 250bar

Reheating Furnace

REHEATING FURNACEREHEATING FURNACE Charging Temperature : 20°C (Cold) Discharging Temperature: 1280°C Fuel (Dual Fired):  Mixed Gas  LCV=3638 kcal/ Nm³; Max. 60,000 Nm³/hr, 

Avg 47 000 nm³/hrAvg. 47,000 nm³/hr Furnace Oil(LCV=9800 kcal/ Nm³)

Specific Fuel Consumption : 0 28 Gcal/ton Specific Fuel Consumption : 0.28 Gcal/ton Combustion Air Fan : 2 nos. (1W+1 S)

Reheating Furnace

Advantages of Slab sizing press (SSP)

Increased width reduction maximum350mmImproved slab caster efficiencyp yImproved yieldPress design which helps reduce the time required forPress design which helps reduce the time required for retrofitting (or installation)

ROUGHING MILLROUGHING MILL 4 Hi‐ Reversing Roughing Mill with attached Edger4 Hi Reversing Roughing Mill with attached Edger R1 motor rating: 2 x 7.5 MW; Roll Force‐ 45000 KN Slab can go thro gh 3 to 11 passes as per req irement Slab can go through 3 to 11 passes as per requirement RM Side Guide – Hyd. Cylinder driven, Opening : 675 – 2350mm

• Transfer bar coming out of R#1 is protected from further

Heat Holding Cover

• Transfer bar coming out of R#1 is protected from furtherheat loss by heat holding cover while it passes through thedelay table prior to entry into Finishing Mill stands

Cover 

• The head end and tail end is cut in the Rotary Drum  type crop‐shear before entry into Finishing Mill

Crop‐shearcrop‐shear before entry into Finishing Mill.  

• The transfer bar is then passed through the Finishing mill

Finishing Mill 

• The transfer bar is then passed through the Finishing mill stands (F1‐F7). 

FINISHING MILLFINISHING MILL 7 finishing stands (4 Hi‐mill) 7 finishing stands (4 Hi‐mill)  F1‐F4: provided with advanced Pair cross mill for Strip crown control

capacityp y F5‐F7: provided with Roll shift arrangement for roll wear dispersion Roll Force: F1‐F4 50,000 KN and F5‐F7 40,000 KN; each mill motor rating is

9.5MW

MILL STABLIZERS A mill stabilizer uses a cylinder installed on the mill entry side or exit side

to press a roll chock against the opposite side with constant force. Thisp g ppeliminates any gap between the roll chock and housing, stabilizing the rollchock.

MILL STABLIZER• APPLICATION OF THE MSD LEADS TO THE  FOLLOWING  

BENEFITS :BENEFITS : Reduces the impact load which occurs when the strip is engaged. Reduces mill vibration Reduces mill vibration. Stabilizes threading. Reduces housing window control work Reduces housing window control work.

DOWN COILERDOWN COILER The strip is made into form of

coil in Down Coiler 2 nos. of Heavy duty hydraulic

coilerscoilers Motor power of each coiler is

1600 KW S i i f 1 Space provision for 1 no. Down

coiler in future The coils are then transportedp

through Pallet Conveyor Transferred to Coil weigher,

paint marking machinepaint marking machine,circumferential and eye bandingm/c

Fi ll t t d t th C il Finally transported to the Coilyard for storage & subsequentdispatch

THANK YOUTHANK YOU