R3.5m square billet CCM caster for steel mill continuous casting and rolling
CCM is mainly composed of ladle, tundish, mould (primary cooling), mould oscillating unit, secondary cooling and casting billet guide device, withdrawal and straightening unit, cutting unit, billet discharge unit (conveying roller), etc.
Curved continuous casting process flow:
Qualified molten steel from steel refining furnace will be poured into steel ladle, then it will be delivered to the position above the CCM after external refining processing, and molten steel will be poured into the tundish from ladle bottom outlet. Tundish nozzle shall be adjusted to match with the lower mould in advance.
After opening the tundish stopper or sliding nozzle (or sizing nozzle), molten steel will flow into forced water-cooled copper mould. The mould has no bottom, so the drop bottom is required before filling with molten steel, meanwhile the drop bottom play a role in drawing out the casting billet and it is called dummy bar.
The molten steel inside the mould will be quickly cooled into crystals; meanwhile molten steel front will be solidified together with the head of dummy bar at the bottom of mould.
The rear end of dummy bar is clamped in the withdrawal roller of billet withdrawing machine, and billet withdrawing machine and mould oscillating unit will be started simultaneously when molten steel inside the mould reach to required height and solidified shell, at the mould lower outlet, reach to a certain thickness.
Withdrawal and straightening machine will pull out the dummy bar (with dummy bar) from the mould at a certain speed. To prevent the solidified shell from cracking breakout and reduce the withdrawal resistance of the mould, mould inner wall lubrication and up-down reciprocating movement are required.
After pulling out from the mould, the casting billet shall be cooled by spaying water, and this is called secondary cooling, meanwhile casting billet liquid-core will be gradually solidified by the secondary cooling.
The casting billet is continuously pulled out and molten steel is continuously poured into the mould, forming into the continuous casting process.
After passing through the billet withdrawing machine and straightening machine (straightening is not required for vertical type and horizontal type continuous casting), the casting billet will be removed from dummy bar.
The completely solidified straight billet will be cut into required size by cutting equipment, and transported to subsequent process by conveying roller.
The equipment used for continuous casting steel production is actually the complete set of mechanical equipment in the continuous casting production line.
In the continuous casting production, one complete set of continuous casting equipment that share with one ladle and capable of one strand or multiple strand casting billet production is called one set of CCM.
One set CCM can be of multiple units or single unit, the unit at here means the independent driving system and work system in one set of CCM.
For each set of CCM, the total quantity of the casting billet that is casted at the same time is called CCM strand quantity.
If one set of CCM has only one unit and is capable of one casting billet production, it is called one unit one strand; if one set of CCM has one unit and is capable of more than two casting billets production at the same time, it is called one unit multiple strands; if one set of CCM has multiple units and capable of multiple casting billet production, called multiple units multiple strands.
Annual output is 30000~50000t with continuous production, customers do not have to stop production or produce discontinuous due to insufficient steel scraps.
Require small area and low elevation, CCM main body occupies around 22m *8m*9m.
Low power consumption,
High reliability, minimum investment, simple installation
Integral lifting and installation turn on the water, gas, power supply to use.
Lower requirement of steel production capacity, start production with one set of electric furnace with capacity more than 0.5T
Various steel casting modes, such as manually carry ladle to cast, rail cars land casting, gantry crane, crane sling ladle casting, furnace casting directly, and multi- furnace continuous casting.
With 250 or 280 mill stands, only need to allocate with simple soaking process, continuous casting and rolling can be realized.
Simple and reliable operation, easy maintenance
Continuous casting material of low, medium and high carbon steel, alloy steel, stainless steel, etc.
Low requirement to cooling water
Configuration of continuous casting machine/CCM
1. Continuous casting machine main components
Oscillation mechanism and main frame
R2.5-6meter arc shape track
Withdrawal and straightening machine
Dummy bar track and storage device
Water cooling and spraying system
Power distribution cabinet: 2pcs
Frequency converter cabinet: 1 pc
Working platform for casting
2. Hydraulic billet cutter
Consist of Main hydraulic cutter and hydraulic station
3. Hydraulic billet pusher
4. Tundish (shell without lining)
5. Tundish movable device
6. Hydraulic tilting steel ladle pouring device
7. Steel ladle
8. Steel ladle hook
9. Water pump, including start cabinet, gate valve, check valve, flange
10. Casting platform
Worker/operator needed (6~7 persons):
Ladle tapping worker: 1,
Billet control worker: 1,
Billet cutting worker: 1,
Billet collection worker: 1~2,
Manger worker: 1,
Continuous casting machine/CCM specification
|Mode||Continuous regulation full arc|
|Arc radius (m)||2.5||4||5.25||6|
|Strand number||1||1||1, 2||2,3,4|
|Cast section (mm2)||60x60 70x70||80x80 100x100||100x100 120x120||120x120 150x150|
|Cast length (m)||3-6||3-6||3-8||3-9|
|Casting productivity of single strand (t/h)||4-8||8-12||10-14||15-20|
|Ingot leading pole||Rigidity leading pole|