ãã1ãhrcæ¯
æ´æ°ç¡¬åº¦çææã
ãã2ã硬度æ¯æææµæå¤ç©åºå
¥çä¸ç§è½åã
ããæ´æ°ç¡¬åº¦ä¸HRAãHRBãHRCä¸çAãBãC为ä¸ç§ä¸åçæ åã称为æ å°ºAãæ å°ºBãæ å°ºCã
ããHRA æ¯éç¨60Kgè½½è·åé»ç³é¥åå
¥å¨æ±ç硬度ï¼ç¨äºç¡¬åº¦æé«çææãä¾å¦ï¼
硬质åéã
ããHRB æ¯éç¨100Kgè½½è·åç´å¾1.58mm淬硬çé¢çæ±å¾ç硬度ï¼ç¨äºç¡¬åº¦è¾ä½çææãä¾å¦ï¼éç«é¢ã é¸éçã
ããHRC æ¯éç¨150Kgè½½è·åé»ç³é¥åå
¥å¨æ±å¾ç硬度ï¼ç¨äºç¡¬åº¦å¾é«çææãä¾å¦ï¼æ·¬ç«é¢çã