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本标准适用气缸直径为160 m m以内的钒钛总含量大于0.2％的钒钛铸铁气缸套金相组织的检验。 1 技术要求 1.1 石墨 石墨应为A型或B型,允许有D型和少量E型,E型石墨应不大于视场面积的30％。成品壁厚小于或等于5mm的气缸套,石墨长度应不大于220μm,成品壁厚大于5 mm的气缸套,石墨长度应不大于250 μm。按本标准第一级别图评定:成品壁厚小于或等于5 m m的气缸套,1～4级合格,成品壁厚大于5 m m的气缸套,1～5级合格。
This standard applies to the cylinder diameter of 160 m m within the total content of vanadium and titanium greater than 0.2% vanadium titanium cast iron cylinder liner metallographic examination. 1 Technical Requirements 1.1 Graphite graphite should be Type A or Type B, allowing a small number of E-type D and E, E-type graphite should not exceed 30% of the field of view. Cylinder liner with wall thickness less than or equal to 5mm, cylinder liner with graphite length not greater than 220μm and finished wall thickness greater than 5mm, graphite length should not exceed 250μm. According to the first level of this standard chart assessment: finished wall thickness less than or equal to 5 m m cylinder liner, qualified 1 to 4, the finished wall thickness greater than 5 m m cylinder liner, 1 to 5 qualified.