Stainless Steel Strip Reversible Cold Reduction Rolling Mill High
Efficiency Power Saving
Stainless steel coil strips thickness reducing mill has some unique features: - stainless steel material has much high tensile and yield strength
- Stronger rolling mill stands, bigger rollers
- Much bigger motors to supply bigger rolling force,
- Dismantable solid coiling mandrel for convenient intermediate
annealing treatment
- Automatic hydraulic AGC control system
- Usually reversible cold mill
- Dual ratios drive can give high efficiency and power saving.
More frequently see reversible SS strip cold rolling mill for the
reasons that: stainless steel strip reducing degree can not be as
much as normal carbon steel, tandem stainless steel mills will be
very costly.
Power saving of advanced dual ratios drive configuration:
| | mill motor | recoiler motor | mill reducer | recoiler reducer | Traditional | 2 x 800Kw Z-560-4 515/1200 440V | 2 x 800Kw Z-560-4 515/1200 440V | I=9;V=305m/min Output torque:267KN.M; | mandrelΦ500×850 (I=6.3;V=299m/min) Tension:103.8KN; | High efficiency Power saving | 2 x 500Kw Z4-500-42 400/1200 440V | 2 x 500Kw Z4-500-42 400/1200 440V | I=14/9 V=196/305m/min 334.25/214.9KN.M; | Mandrel Φ650×850 I=14/9 V=175/272m/min tension:185.7/119.4KN; | Conclusion: 1) new type high efficiency mill has 25% bigger torque in rough
rolling and 78.9% bigger tension, the torque and tension is
completely enough at increasing speed, and more stable rolling at
thin sheet below 0.3mm; 2) the power saving is obvious, transformer can be 800-900KVA
smaller. |
Rolling process: Hydraulic payoff uncoiler →coil loading car→solid mandrel
recoiler→4hi rolling mill(include entry and exit press
plates)--solid mandrel recoiler(electric control, AGC system,
hydraulic, thin oil system)
Intermediate annealing for SS strip is solution treatment in
continuous annealing furnace at speed of around 40m per minute,
after cold rolling and annealing, the tension leveling is also
considered in the process.
We supply different models stainless steel cold rolling mills of
high level configuration to stainless steel coil plants, thus
accumulate rich experiences in stainless steel rolling technology,
can ensure high efficiency stable rolling process, customers will
profit from investing cold mill made by our company.
Take 850 four roller (4 high) reversible cold rolling mill for
stainless steel strip up to 750mm with hydraulic AGC configuration as example. | Stainless Steel coil parameters | | Stainless steel material | 200 , 300, 400 series pickled | | Incoming SS coil strip | 550-750mm x 0.65-0.80mm | | Incoming SS coils | 508mm ID, 1800mm OD, 15T | | Cold rolled finished SS coil strip | 550-750 x 0.30-0.45mm | | Reverse Rolling mill parameters | | Rolling mill speed | Max 300m/min, 80-100T/day production | | Rolling force | Max 10000KN | | Recoiling tension | Up to 150KN | | Work roller spec. | Ф185 x 870mm | | Backup roller spec. | Ф730 x 850mm | | Main motor power | 1100KW | | Recoil motor power | 630KW | | Electric control | Hydraulic AGC, Siemens RA80 DC Drivers, PLC, X-ray Thickness Gauge
system | | Liquid conditions | Thin oil lubrication for gearboxes, oil gas lubrication for bearing
seats, hydraulic stations, rolling process coolant system | | Automatic roller changing | Hydraulic motor and cylinder drive, to realize automatic roller
change |
Work process:
15T Uncoiler, pinch feeder and 5 roller straightener, 1st Recoiler,
4 Hi Hydraulic AGC Reversible Mill, 2nd Recoiler.
Stainless steel strip continuous solution annealing furnace line. - Uncoiler with 22KW motor for threading, in normal production, is
passive uncoiling with brake
- Heat temperature about 1070°C under protection air atmosphere.
- Heating furnace is composed of pre heating zone and hot heating
zone, total about 25m length
- S roll briddle unit at exit of furnace to pull stainless steel
strip continuously out from furnace
- Two recoilers, one is working and the other is discharging annealed
SS coil and ready for next coil recoiling, to ensure non stop
continuous working of the whole annealing line.
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