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日本开发出一种超小型热轧机轨辊轴承,其寿命 为普通轧辊轴承的三倍。 制造中采用特殊真空冶炼法使非金属夹杂物浮起,
Japan developed a super-miniature hot-rolling mill rail roller bearings, the life of ordinary roller bearing three times. Manufacture of special vacuum smelting method to float non-metallic inclusions,