Explicación dos termos HRA, HRC e HV
1，A broca HRA é un corpo cónico de diamante de 120 ± 0,5 °, cunha curvatura superior de 0,2 ± 0,002 mm e unha carga de 60 kg.
2，A broca HRC é un corpo cónico de diamante de 120 ± 0,5 °, cunha curvatura superior de 0,2 ± 0,002 mm e unha carga de 150 kg.
3, Superficie diagonal HV de broca de diamante de pirámide cuadrangular de 136 °, o valor de dureza é a presión específica sobre a área da unidade de sangría, a carga é de 50/100 gramos de forza, a área de sangría é de varios um, o valor é kg/mm
| HV | HRC | HRA | HV | HRC | HRA | HV | HRC | HRA |
| 1700,0 | 80.5 | 92.5 | 528,0 | 51.0 | 76,0 | 31.0 | 66.0 | |
| 1600,0 | 80,0 | 92.0 | 513.0 | 50,0 | 76,0 | 301.0 | 30.0 | 66.0 |
| 1550,0 | 79,0 | 91.5 | 498,0 | 49.0 | 76,0 | 29.0 | 65,0 | |
| 1500,0 | 78,0 | 91.0 | 48.5 | 75,0 | 28.5 | 65,0 | ||
| 1450,0 | 77,0 | 90,5 | 485,0 | 48.0 | 75,0 | 285,0 | 28.0 | 65,0 |
| 1400,0 | 76,0 | 90,0 | 47.5 | 74.5 | 27.5 | 64.5 | ||
| 1350,0 | 75,0 | 89.5 | 471,0 | 47.0 | 74.0 | 27.0 | 64.0 | |
| 1300,0 | 74.0 | 89,0 | 458,0 | 46.0 | 73.5 | 26.5 | 64.0 | |
| 1250,0 | 73,0 | 88.5 | 45.0 | 73,0 | 271,0 | 26.0 | 64.0 | |
| 1200,0 | 72.0 | 88,0 | 446.0 | 44.5 | 73,0 | 25.5 | 63.5 | |
| 1150,0 | 71.5 | 87.5 | 435,0 | 44.0 | 73,0 | 25.0 | 63.0 | |
| 1140.0 | 71.0 | 87,0 | 43.5 | 72.5 | 24.5 | 63.0 | ||
| 1076.0 | 70,0 | 86.5 | 43.0 | 72.0 | 257,0 | 24.0 | 62.5 | |
| 1004.0 | 69,0 | 86,0 | 413.0 | 42.0 | 72.0 | 23.5 | 62.0 | |
| 942,0 | 68,0 | 85.8 | 41.5 | 71.5 | 23.0 | 62.0 | ||
| 894.0 | 67.0 | 85,0 | 41.0 | 71.0 | 22.5 | 62.0 | ||
| 854.0 | 66.0 | 84.5 | 40.5 | 70.5 | 22.0 | 62.0 | ||
| 820,0 | 65,0 | 84.0 | 393,0 | 40,0 | 70.5 | 21.5 | 61.5 | |
| 789,0 | 64.0 | 83.5 | 39.5 | 70,0 | 21.0 | 61.0 | ||
| 763,0 | 63.0 | 83.0 | 39.0 | 70,0 | 20.5 | 61.0 | ||
| 739,0 | 62.0 | 82.5 | 38.5 | 69.5 | 236,0 | 20.0 | 61.0 | |
| 716.0 | 61.0 | 82.0 | 373,0 | 38.0 | 69,0 | 223,0 | 19.5 | 60.5 |
| 695,0 | 60,0 | 81.5 | 37.5 | 69,0 | 217,0 | 19.0 | 60,0 | |
| 675,0 | 59.0 | 81.0 | 37.0 | 69,0 | 18.5 | 60,0 | ||
| 655,0 | 58.0 | 80.5 | 36.5 | 68.5 | 209.0 | 18.0 | 60,0 | |
| 636.0 | 57.0 | 80,0 | 353,0 | 36.0 | 68,0 | 205.0 | 60,0 | |
| 56.5 | 79.5 | 35.5 | 68,0 | 197.0 | 59.0 | |||
| 617.0 | 56.0 | 79,0 | 35.0 | 67.5 | 195,0 | 58.0 | ||
| 598,0 | 55.0 | 78,0 | 334.0 | 34.5 | 67.0 | 191.0 | 57.5 | |
| 580,0 | 54.0 | 78,0 | 34.0 | 67.0 | 186,0 | 56.0 | ||
| 562,0 | 53.0 | 78,0 | 33.5 | 67.0 | ||||
| 545,0 | 52.0 | 77,0 | 317.0 | 32.0 | 67.0 | |||
| 51.5 | 76.5 | 31.5 | 66.0 |
Hora de publicación: 18-Abr-2024