@Copyright 2017 by China Steel Corporation All rights reserved. 1

@Copyright 2017 by China Steel Corporation All rights reserved. 1

@Copyright 2017 by China Steel Corporation All rights reserved. 2

@Copyright 2017 by China Steel Corporation All rights reserved. 3

@Copyright 2017 by China Steel Corporation All rights reserved. 4

@Copyright 2017 by China Steel Corporation All rights reserved. 5

efine M A I C Coil chamber coil transfer equipment @Copyright 2017 by China Steel Corporation All rights reserved. 6

efine M A I C Temp. Length Pyrometer Difference: 53 @Copyright 2017 by China Steel Corporation All rights reserved. 7

Measure A I C 567 12 34 4 6 2 3 5 7 1 350 300 8 2 3 Test Result 8 250 200 150 100 50 0 1 8 0 4 8 12 16 20 24 P1 P2 P3 P4 P5 P6 P7 P8 Heating condition 400 /15hours+200 /5hours @Copyright 2017 by China Steel Corporation All rights reserved. 8

Measure A I C Issue Description Target Coil internal temperature difference Long preheating time Bottom portion temperature is low (temperature difference is 53 ) Center portion temperature is low (temperature difference is 20 ) In 25 In 10 30 hours pre-heating time In 15 hours @Copyright 2017 by China Steel Corporation All rights reserved. 9

M Analyze I C Coil Issue Bottom temperature is low Center temperature is low Long Pre-heat time Analysis Inhalation of cool air Heating source is from the side Internal temperature uniformity Heating efficiency is low @Copyright 2017 by China Steel Corporation All rights reserved. 10

M A Improve C Prevent bottom portion to be cooled down Reduce gap between skid and coil transfer equipment Add a lower portion nozzles Coil Reduce the gap Add a lower Portion nozzle @Copyright 2017 by China Steel Corporation All rights reserved. 11

M A Improve C Factor Level Hot gas Temperature 200 300 400 Nozzle Pressure P1 P2 Furnace Pressure P 1 P 2 Temperature difference @Copyright 2017 by China Steel Corporation All rights reserved. 12

M A Improve C P1 P2 Nozzle pressure P=0<0.05, judge it as crucial factor without interaction @Copyright 2017 by China Testing Steel Corporation condition:300 /12Hours All rights reserved. 13

M A Improve C Box Plot for Edge-to-Center temperature difference Temperature difference P1 P2 P3 P4 P5 P6 P7 Nozzle Pressure @Copyright 2017 by China Steel Corporation All rights reserved. 14

M A Improve C Center-to-edge temp. difference P6 P7 P=0.456>0.05, Judge it as no difference @Copyright 2017 by China Steel Corporation All rights reserved. 15

M A Improve C Box Plot for coil temperature coil temperature P 1 P 2 P 3 P 4 Furnace Pressure Coil Temperature @Copyright 2017 by China Steel Corporation All rights reserved. 16

M A Improve C coil temperature P 3 P 4 P=0.004<0.05, Judge it is not the same. @Copyright 2017 by China Steel Corporation All rights reserved. 17

M A Improve C 350 Test Result 300 250 200 150 100 50 0 0 4 8 12 16 20 24 P1 P2 P3 P4 P5 P6 P7 P8 @Copyright 2017 by China Steel Corporation All rights reserved. 18

M A Improve C Temp. Length Temp. Length @Copyright 2017 by China Steel Corporation All rights reserved. 19

M A Improve C Issue Countermeasure Result Top-to-bottom temperature difference Edge-to-Center temperature difference Long pre-heat time Reduce Gap Add a lower nozzle Adjust nozzle pressure Improving coil uniformity Adjust Furnace pressure From 53 to 20 (better than target 25 ) From 20 to 10 (archived target 10 ) From 30 hours to 10 hours (better than target 15 hours) @Copyright 2017 by China Steel Corporation All rights reserved. 20

M A Improve C Before improvement Natural Gas Consumption(Nm 3 /t) Modify Equipment Nozzle pressure adjust Furnace pressure adjust After improvement 2015-1Q 2015-2Q 2015-3Q 2015-4Q 2016-1Q 2016-2Q 2016-3Q 2016-4Q @Copyright 2017 by China Steel Corporation All rights reserved. 21

M A Improve C Profit Reduce NG Consumption Reduce Electricity Consumption Reduce Roll change frequency state Save 40% consumption Save 54% consumption Reduce 709 times/year Money save (hundred thousand USD/year) 2.449 1.401 0.094 Summary 3.944 @Copyright 2017 by China Steel Corporation All rights reserved. 22

M A I Control @Copyright 2017 by China Steel Corporation All rights reserved. 23

@Copyright 2017 by China Steel Corporation All rights reserved. 24

@Copyright 2017 by China Steel Corporation All rights reserved. 25