ããé ç¬æ21ç§åå·ã
ããé ç¬é è¯ç硬度æ å¿ï¼ä¸è¬ç¨âHâ表示硬质é ç¬ï¼âBâ表示软质é ç¬ï¼âHBâ表示软硬éä¸çé ç¬ï¼âFâ表示硬度å¨HBåHä¹é´çé ç¬ã
ããæåæ¹å¼ï¼ç±è½¯è³ç¡¬ï¼9Bã8Bã7Bã6Bã5Bã4Bã3Bã2BãBãHBãFãHã2Hã3Hã4Hã5Hã6Hã7Hã8Hã9Hã10Hç硬度ç级ã
ããHåé¢çæ°åè¶å¤§ï¼è¡¨ç¤ºå®çé è¯è¶ç¡¬ï¼é¢è²è¶æ·¡ãBåé¢çæ°åè¶å¤§ï¼è¡¨æé¢è²è¶æµãè¶é»ãé ç¬æçåç±»æ£æ¯æç §ç¬è¯ä¸ç³å¢¨ç份éæ¥ååãå ¶ä¸Hç±»é ç¬ï¼ç¬è¯ç¡¬åº¦ç¸å¯¹è¾é«ï¼éåç¨äºçé¢ç¸å¯¹è¾ç¡¬ææç¡®çç©ä½ï¼æ¯å¦æ¨å·¥å线ï¼éå¤ç»å¾çï¼HBç±»é ç¬ç¬è¯ç¡¬åº¦éä¸ï¼éåä¸è¬æ åµä¸ç书åï¼ææè½®å»ç¨ï¼Bç±»é ç¬ï¼ç¬è¯ç¸å¯¹è¾è½¯ï¼éåç»ç»ï¼ä¹å¯ç¨äºå¡«æ¶ä¸äºæºå¨å¯è¯å«çå¡çãæ¯å¦ï¼æ们常使ç¨2Bé ç¬æ¥å¡«æ¶çé¢å¡ãå¦å¤ï¼å¸¸è§çè¿æ彩è²é ç¬æï¼ä¹å°±æ¯äººä»¬å¸¸è¯´ç彩è²é ç¬ï¼ä¸»è¦ç¨äºç»ç»ã
åèèµæï¼http://baike.baidu.com/subview/2778/2778.html#1_2