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Descaling----Part of the Rolling Process

Source: | Updated: Nov 07, 2016

Rolling process has been divided into many step of process, this article mainly talk about the Descaling. The detail of the it as following:

Between the Crop Shear and the first Finishing Mill Stand sits the #2 ScaleBreaker, which is tasked with the final scale removal operation. Sprays above and below the transfer bar blast it with 1,500 psi jets of water to break up the scale that has re-formed since the descaling operation at the entry of the last roughing mill, as well as any scale that has persisted through earlier descaling operations. After descaling by the low-pressure headers, the bar is pinched by a pair of pneumatically-actuated rolls to mechanically loosen any remaining scale, which, as the processing temperatures cool off, becomes increasingly sticky even as it returns ever more slowly to the surfaces of the still red-hot steel. Finally, a pair of highpressure headers operating at nearly 3,000 psi makes a final pass at both surfaces of the transfer bar shortly before it enters F6 for finish rolling. As with the roughing mill’s descaling system, for some thinner-gauge, wider, and/or stiffer products, the low-pressure header is disabled to conserve heat for rolling.

In part because further descaling is not particularly practical once finish rolling begins, the #2 Scale Breaker is the last opportunity to remove oxidation before the finished hot-rolled strip is coiled. Typically, the descaling system in the Hot Strip Mill is very effective at removing primary (from the furnace) and secondary (regrown during roughing rolling) scale.

From all above weve described, we can came to a conclusion that Descaling is a very important part of the whole rolling process. And with the rapid development of all kinds of rolling technology, the whole rolling industry will be going to have a glory era.

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