Sink Roll for galvalume line by Qingdao Hexin Machinery Co.,Ltd.
Reasons why high-speed steel sink rolls are cooled in use High-speed steel material has a large amount of thermal expansion, and poor roll temperature distribution is prone to uneven thermal expansion and abnormal shedding of the oxide film, which affects the thermal crown and roll gap accuracy of sink rolls . The key factor affecting the oxide film and thermal crown of high-speed steel sink rolls is the surface temperature of sink rolls. Therefore, the ideal cooling method of sink rolls and shortening the time that the sink roll surface is in a high temperature state are important means to control the thickness of the oxide film on the sink roll surface, control the thermal crown, and reduce thermal cracks. During the hot rolling process, the instantaneous contact temperature of sink rolls is 600 ℃ ~750 ℃ , and the temperature of sink rolls exceeds 50 ℃ . prevent further oxidation. After the sink rolls pass through the instantaneous high temperature contact zone, t...