260 INFORMAZIONI TECNICHE QConversione approssimativa dei valori di durezza Rockwell C per l'acciaio(1) (HRC) Durezza Rockwell scala C (HV) Durezza Vickers Durezza Brinell (HB) Sfera da 10mm, Carico di 3000kgf Durezza Rockwell(3) Durezza superficiale Rockwell Penetratore a cono di diamante (Hs) Carico di rottura (Valore approssimato) Mpa (kgf/mm2) (2) Durezza Rockwell scala C (3) Sfera standard Sfera in carburo di tungsteno (HRA) Scala A, carico 60kgf, Penetratore a cono di diamante (HRB) Scala B, carico 100kgf, Sfera con diametro 1.6mm (1/16 poll.) (HRD) Scala D, carico 100kgf, Penetratore a cono di diamante Scala 15-N carico 15kgf Scala 30-N carico 30kgf Scala 45-N carico 45kgf 68 940 − − 85.6 − 76.9 93.2 84.4 75.4 97 − 68 67 900 − − 85.0 − 76.1 92.9 83.6 74.2 95 − 67 66 865 − − 84.5 − 75.4 92.5 82.8 73.3 92 − 66 65 832 − (739) 83.9 − 74.5 92.2 81.9 72.0 91 − 65 64 800 − (722) 83.4 − 73.8 91.8 81.1 71.0 88 − 64 63 772 − (705) 82.8 − 73.0 91.4 80.1 69 9 87 − 63 62 746 − (688) 82.3 − 72.2 91.1 79.3 68.8 85 − 62 61 720 − (670) 81.8 − 71.5 90.7 78.4 67.7 83 − 61 60 697 − (654) 81.2 − 70.7 90.2 77.5 66.6 81 − 60 59 674 − (634) 80.7 − 69.9 89.8 76.6 65.5 80 − 59 58 653 − 615 80.1 − 69.2 89.3 75.7 64.3 78 − 58 57 633 − 595 79.6 − 68.5 88.9 74.8 63.2 76 − 57 56 613 − 577 79.0 − 67.7 88.3 73.9 62.0 75 − 56 55 595 − 560 78.5 − 66.9 87.9 73.0 60.9 74 2075(212) 55 54 577 − 543 78.0 − 66.1 87.4 72.0 59.8 72 2015(205) 54 53 560 − 525 77.4 − 65.4 86.9 71.2 58.5 71 1950(199) 53 52 544 (500) 512 76.8 − 64.6 86.4 70.2 57.4 69 1880(192) 52 51 528 (487) 496 76.3 − 63.8 85.9 69.4 56.1 68 1820(186) 51 50 513 (475) 481 75.9 − 63.1 85.5 68.5 55.0 67 1760(179) 50 49 498 (464) 469 75.2 − 62.1 85.0 67.6 53.8 66 1695(173) 49 48 484 451 455 74.7 − 61.4 84.5 66.7 52.5 64 1635(167) 48 47 471 442 443 74.1 − 60.8 83.9 65.8 51.4 63 1580(161) 47 46 458 432 432 73.6 − 60.0 83.5 64.8 50.3 62 1530(156) 46 45 446 421 421 73.1 − 59.2 83.0 64.0 49.0 60 1480(151) 45 44 434 409 409 72.5 − 58.5 82.5 63.1 47.8 58 1435(146) 44 43 423 400 400 72.0 − 57.7 82.0 62.2 46.7 57 1385(141) 43 42 412 390 390 71.5 − 56.9 81.5 61.3 45.5 56 1340(136) 42 41 402 381 381 70.9 − 56.2 80.9 60.4 44.3 55 1295(132) 41 40 392 371 371 70.4 − 55.4 80.4 59.5 43.1 54 1250(127) 40 39 382 362 362 69.9 − 54.6 79.9 58.6 41.9 52 1215(124) 39 38 372 353 353 69.4 − 53.8 79.4 57.7 40.8 51 1180(120) 38 37 363 344 344 68.9 − 53.1 78.8 56.8 39.6 50 1160(118) 37 36 354 336 336 68.4 (109.0) 52.3 78.3 55.9 38.4 49 1115(114) 36 35 345 327 327 67.9 (108.5) 51.5 77.7 55.0 37.2 48 1080(110) 35 34 336 319 319 67.4 (108.0) 50.8 77.2 54.2 36.1 47 1055(108) 34 33 327 311 311 66.8 (107.5) 50.0 76.6 53.3 34.9 46 1025(105) 33 32 318 301 301 66.3 (107.0) 49.2 76.1 52.1 33.7 44 1000(102) 32 31 310 294 294 65.8 (106.0) 48.4 75.6 51.3 32.7 43 980(100) 31 30 302 286 286 65.3 (105.5) 47.7 75.0 50.4 31.3 42 950 (97) 30 29 294 279 279 64.7 (104.5) 47.0 74.5 49.5 30.1 41 930 (95) 29 28 286 271 271 64.3 (104.0) 46.1 73.9 48.6 28.9 41 910 (93) 28 27 279 264 264 63.8 (103.0) 45.2 73.3 47.7 27.8 40 880 (90) 27 26 272 258 258 63.3 (102.5) 44.6 72.8 46.8 26.7 38 860 (88) 26 25 266 253 253 62.8 (101.5) 43.8 72.2 45.9 25.5 38 840 (86) 25 24 260 247 247 62.4 (101.0) 43.1 71.6 45.0 24.3 37 825 (84) 24 23 254 243 243 62.0 100.0 42.1 71.0 44.0 23.1 36 805 (82) 23 22 248 237 237 61.5 99.0 41.6 70.5 43.2 22.0 35 785 (80) 22 21 243 231 231 61.0 98.5 40.9 69.9 42.3 20.7 35 770 (79) 21 20 238 226 226 60.5 97.8 40.1 69.4 41.5 19.6 34 760 (77) 20 (18) 230 219 219 − 96.7 − − − − 33 730 (75) (18) (16) 222 212 212 − 95.5 − − − − 32 705 (72) (16) (14) 213 203 203 − 93.9 − − − − 31 675 (69) (14) (12) 204 194 194 − 92.3 − − − − 29 650 (66) (12) (10) 196 187 187 − 90.7 − − − − 28 620 (63) (10) (8) 188 179 179 − 89.5 − − − − 27 600 (61) (8) (6) 180 171 171 − 87.1 − − − − 26 580 (59) (6) (4) 173 165 165 − 85.5 − − − − 25 550 (56) (4) (2) 166 158 158 − 83.5 − − − − 24 530 (54) (2) (0) 160 152 152 − 81.7 − − − − 24 515 (53) (0) Nota(1): Valori in blu: in base a ASTM E 140, Tabella 1 (coordinamento congiunto di SAE, ASM e ASTM.) (2): Unità e valori tra parentesi sono il risultato della conversione dai valori in psi con riferimento alle tabelle di conversione JIS Z 8413 e Z 8438. Inoltre, 1MPa=1N/mm2 (3): I valori tra parentesi rientrano in gamme di utilizzo non frequente. Vengono forniti come dati di riferimento. Durezza Shore Informazioni tecniche generali Tabella di conversione delle durezze
RkJQdWJsaXNoZXIy MTc2MTk0OA==