Not only the surface quality of the imported bearing workpiece is poor, but also the resistance of the workpiece to crystal corrosion is degraded. When the imported bearing workpiece is severely overheated, the grain is coarse, and at the same time, the amount of the 8 iron wire in the steel is increased, which tends to deteriorate the hot workability of the workpiece. lcrl8Ni9Ti stainless steel accompanying body or flange parts are prone to orange peel surface defects when overheating occurs.
To this end, propose preventive measures such as
(1) Strictly control the forging heating temperature and heating and holding time of the lcrl8Ni9]ri stainless steel box and flange parts to prevent the workpiece from being overheated and causing coarse defects in the workpiece.
(2) In the forging production of workpieces, if the forging ratio is too small, the final forging temperature is too high, and the coarse-grained structure defects are also prone to occur. The workpiece forging ratio should be suitable and sufficient, and the final forging temperature is moderate.
(3) The heat treatment solution temperature of the imported bearing workpiece should not be too high, the holding time should not be too long, the heating temperature should not be higher than 1150"C, and the holding time should be calculated as 1 l_5min/mm.
(4) For the coarse workpiece with overheated structure, the method of forging and refining the grain can be used to eliminate the defect, prevent the orange peel surface defect when the workpiece is cold deformed, and improve the surface quality of the workpiece.
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