LR A steel plates surface pits is one of the reason why LR grade A Shipbuilding steel plates are poor in surface quality. Since ASTM A131 grade A steel surface pits is so harmful, how do you avoid it?
First, we need to know reasons caused LR A steel plates surface pits:
the unreasonable air-fuel ratio control of burning steel, resulting in iron oxide adhere to slab surface and can not be removed. The water pressure is not enough and can not continuouslyinject. So it can not clearly remove iron oxide. The residual iron oxide rolling press into LR A steel plates and form surface pits during the LR grade A plates rolling.
The measures to avoid LR A steel plates surface pits are as follows: adjusting the air-fuel ratio of the heating section; reforming the high-pressure water system to high-pressure centrifugal pump; lifting the nozzle height on the descaling box, and improving the water pressure during descaling.
Hope the information is helpful to you. If you want to consult more about LR A steel plates surface pits, please contact us freely.
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