Continous Casting of Steel
Secondary cooling
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The demand for improved product quality and increased productivity has focussed attention on the need for more efficient systems of spray cooling during continuous casting. Nozzle characteristics must be investigated and test procedures developed to measure cooling patterns and heat transfer. Lechler has developed new nozzles with higher heat transfer coefficients, better water distribution performances and larger free passages.
There are also important operational benefits such as:
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Nozzles for every caster
From simple billet casters for rebars to sophisticated machines for tire cord grades or for casters for beam blanks and round blooms, Lechler offers the optimal nozzle solutions both for water only cooling or air mist systems. The same goes for thick or thin slab casters. Solutions for HARD-HARD® INTENSIVE COOLING and SOFT REDUCTION applications are available, too.
Modern slab continuous casting plants are in most cases fitted with specially designed and customised air mist nozzles of the Mastercooler type. This applies to both conventional thick slab plants and the more compact thin slab plants.
Nozzle parameters
A defect free slab, bloom, billet or beam blank and an economical operation are the objectives to be achieved by the spray nozzle cooling system. The nozzle manufacturer must have detailed knowledge of the behaviour of the nozzles under operation conditions and the machine segment design.
Of particular concern are:
- Nozzle type selection according to the product mix and machine design
- New nozzle designs
- Heat transfer coefficients measurements of the spray nozzles
- Air-water ratio
- Water turn-down ratio
- Water distribution
- New methods of nozzle mounting and new header pipe designs
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