Example; 6-Hi Reversible Cold Rolling Mill
Annual Yield – 200,000 Tons
Incoming Material
Hot rolling strip after pickling |
Material |
common carbon steel |
|
(Q195, Q215, 08AL, 20, SPCC, SPCD….) |
Mechanical property |
σs ≤ 360 (mm2) |
Thickness |
1.8 ~ 4.5 mm (for common carbon steel) |
Width |
800 ~ 1250 mm |
Coil diameter (inner/outer) |
Ф 610/ Ф 900 ~ 2000 mm |
Max coil weight |
25 tons |
Finished Product
Thickness |
0.2 ~ 1.5 mm (for common carbon steel) |
Width |
800 ~ 1250 mm |
Coil diameter (inner/outer) |
Ф 610/ Ф 900 ~ 2000 mm |
Max coil weight |
25 tons |
Requirements for Raw Material
Longitudinal thickness deviation of raw material |
≤ ± 0.2 mm |
Longitudinal thickness change rate of raw material |
≤ ± 0.02 mm/m |
Transverse thickness deviation of raw materia |
≤ ± 2 % |
Product Precision
Thickness tolerance in steady state
± 5 μm (δ < 0.5 mm)
± 1 % δ (δ ≥ 0.5 mm)
The thickness tolerance in accelerating / decelerating is 2 times more than rolling in steady speed.
Note: The precision of the products is guaranteed based on the precision of incoming raw material quality.
Main Technical Data
Roll Assembly
Item |
Working Roll |
Intermediate Roll |
Supporting Roll |
Roll diameter (mm) |
Ф 400 ~ 370 |
Ф 450 ~ 415 |
Ф 1250 ~ 1190 |
Roller length (mm) |
1450 |
1450 |
1350 |
Material |
9Cr3MoV |
9Cr3MoV |
9Cr2MoV |
Heat treatment |
Electro-slag re-melting forged steel with quenched surface |
Hardness (HS) |
HS93-97 |
HS75-80 |
HS65-70 |
Processing Parameters
Item |
Specification |
Maximum Rolling force |
18,000 KN |
Maximum Rolling torque |
135 KN.m |
Pay-off tension |
8 ~ 80 KN |
Coiling tension |
17 ~ 170 KN (V < 640 m/min) |
10 ~ 100 KN (V ≥ 640 m/min) |
Speed |
Threading |
18 m/min |
Rolling |
0 ~ 450 ~ 1,000 m/min |
Coiling |
1,050 m/min (Maximum) |
Acceleration of mill |
0.8 m/s2 |
Deceleration of mill |
0.8 m/s2 |
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