Appendice Correzioni da aggiungere ai valori di lettura “C” Rockwell ottenuti su superfici cilindriche Lettura ottenuta (valore leggibile all’interno della macchina durante la misurazione della durezza) Reale valore HRC ø 2 mm ø 3 mm ø 4 mm ø 5 mm ø 6 mm ø 7 mm ø 8 mm ø 9 mm ø 10 mm 15,0 18,5 22,0 24,0 25,0 26,0 26,5 27,0 27,5 30 16,5 20,0 23,0 25,0 26,0 27,0 27,5 28,0 28,5 31 18,0 21,0 24,0 26,0 27,5 28,0 29,0 29,5 29,5 32 19,0 22,5 25,5 27,5 28,5 29,0 30,0 30,5 30,5 33 20,5 23,5 26,5 28,5 29,5 30,5 31,0 31,5 32,5 34 21,5 25,0 27,5 29,5 30,5 31,5 32,0 32,5 33,0 35 23,0 26,0 29,0 30,5 31,5 32,5 33,0 33,5 34,0 36 24,5 27,5 30,0 31,5 33,0 33,5 34,0 34,5 35,0 37 25,5 28,5 31,0 33,0 34,0 34,5 35,0 35,5 36,0 38 27,0 30,0 32,5 34,0 35,0 35,5 36,5 36,5 37,0 39 28,5 31,0 33,5 35,0 36,0 37,0 37,5 37,5 38,0 40 29,5 32,5 34,5 36,0 37,0 38,0 38,5 39,0 39,0 41 31,0 33,5 36,0 37,5 38,0 39,0 39,5 40,0 40,0 42 32,0 35,0 37,0 38,5 39,5 40,0 40,5 41,0 41,5 43 33,5 36,0 38,0 39,5 40,5 41,0 41,5 42,0 42,5 44 35,0 37,5 39,5 40,5 41,5 42,0 42,5 43,0 43,5 45 36,0 38,5 40,5 42,0 42,5 43,5 43,5 44,0 44,5 46 37,5 40,0 41,5 43,0 43,5 44,5 45,0 45,0 45,5 47 39,0 41,0 43,0 44,0 45,0 45,5 46,0 46,0 46,5 48 40,0 42,0 44,0 45,0 46,0 46,5 47,0 47,5 47,5 49 41,5 43,5 45,0 46,5 47,0 47,5 48,0 48,5 48,5 50 43,0 44,5 46,5 47,5 48,0 48,5 49,0 49,5 49,5 51 44,0 46,0 47,5 48,5 49,0 49,5 50,0 50,5 51,0 52 45,5 47,0 48,5 49,5 50,5 51,0 51,0 51,5 52,0 53 46,5 48,5 50,0 51,0 51,5 52,0 52,5 52,5 53,0 54 48,0 49,5 51,0 52,0 52,5 53,0 53,5 53,5 54,0 55 49,5 51,0 52,0 53,0 53,5 54,0 54,5 54,5 55,0 56 50,5 52,0 53,5 54,0 54,5 55,0 55,5 56,0 56,0 57 52,0 53,5 54,5 55,5 56,0 56,0 56,5 57,0 57,0 58 53,5 54,3 55,5 56,5 57,0 57,5 57,5 58,0 58,0 59 54,5 56,0 57,0 57,5 58,0 58,5 58,5 59,0 59,0 60 56,0 57,0 58,0 58,5 59,0 59,5 60,0 60,0 60,5 61 57,5 58,5 59,0 59,5 60,0 60,5 61,0 61,0 61,5 62 58,5 59,5 60,5 61,0 61,5 61,5 62,0 62,0 62,5 63 60,0 61,0 61,5 62,0 62,5 62,5 63,0 63,0 63,5 64 61,0 62,0 62,5 63,0 63,5 64,0 64,0 64,5 64,5 65 62,5 63,5 64,0 64,0 64,5 65,0 65,0 65,5 65,5 66 64,0 64,5 65,0 65,5 65,5 66,0 66,0 66,5 66,5 67 65,0 66,0 66,0 66,5 66,5 67,0 67,5 67,5 67,2 68 Riferimento incrociato - Standard sull’acciaio Gruppo mat. W. n. EN AFNOR AISI 1.2067 100 Cr 6 100 C6 ~L3 WS 1.2510 100 MnCrW 4 90MCWV 5 O1 1.2210 115 CrV 3 115 CV 3 L2 WAS 1.2343 1.2344 X 38 CrMoV 5 X 40 CrMoV 5 1 Z 38 CDV 5 Z 40 CDV 5 H11 H13 Gli standard sull’acciaio attualmente utilizzati da DME sono evidenziati in grassetto. 44 - www.dmeeu.com
25/01/2011 Indice www.dmeeu.com