Pass Style Box Pass
Pre-PFM ROA (%)
Post-PFM ROA (%)
Difference
26.8
25.4
-1.4
32.7
27.6
-5.1
42.9
38.7
-4.2
22.8
22.1
-0.7
35.6
30.1
-5.5
25.3
26.4
1.1
31.1
26.8
-4.3
N/A
N/A
N/A
23.5
22.5
-1.0
28.1
23.3
-4.8
20.4
19.7
-0.7
24.3
20.1
-4.2
17.2
15.6
-1.6
23.2
21.1
-2.1
14.3
16.1
1.8
N/A
20.3
N/A
N/A
19.9
N/A
2 Box Pass
3 Diamond (pre-PFM)
Oval (post-PFM)
4 Square (pre-PFM)
5
Round (post-PFM)
Oval
6 Round
7 8
Oval Dummy Pass
9 Round
10
Oval
11 Round
12
Oval
13 Round
14
Oval
15 Round
PFM-1 Oval
PFM-2 Round
Fig. 6. Pass design in the roughing mill at Sterling Steel, before and after the PFM installation. DECEMBER 2018 | 67
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