推荐回答（1个）
区别是研磨后的光洁度
600的要高于320
600目研磨后的金属表面就很光滑了，研磨面细腻
给您个参考感觉，平时用的砂轮片是80目的，磨出的表面很刮手
不锈钢制品表面拉丝，一般就是600-800目研磨的
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