洛氏硬度標尺 | 硬度 符號 | 壓頭類型 | 初試驗力 F0(N) | 主試驗力 F1(N) | 總試驗力 F0+ F1(N) | 適用范圍 |
A | HRA | 120°金剛石圓錐 | 98.07 | 490.3 | 588.4 | 20~88HRA |
B | HRB | 1.5875mm鋼球 | 98.07 | 882.6 | 980.7 | 20~100HRB |
C | HRC | 120°金剛石圓錐 | 98.07 | 1373 | 1471 | 20~70HRC |
D | HRD | 120°金剛石圓錐 | 98.07 | 882.6 | 980.7 | 40~77HRD |
E | HRE | 3.175mm鋼球 | 98.07 | 882.6 | 980.7 | 70~100HRE |
F | HRF | 1.5875mm鋼球 | 98.07 | 490.3 | 558.4 | 60~100HRF |
G | HRG | 1.5875mm鋼球 | 98.07 | 1373 | 1471 | 30~94HRG |
H | HRH | 3.175mm鋼球 | 98.07 | 490.3 | 558.4 | 80~100HRH |
K | HRK | 3.175mm鋼球 | 98.07 | 1373 | 1471 | 40~100HRK |
表面洛氏 硬度標尺 | 硬度 符號 | 壓頭類型 | 初試驗力F0(N) | 主試驗力F1(N) | 總試驗力 F0+ F1(N) | 適用范圍 |
15N | HR15N | 120° 金剛石圓錐 | 29.42 | 117.7 | 147.1 | 70~94HR15N |
30N | HR30N | 264.8 | 294.2 | 42~86HR30N | ||
45N | HR45N | 411.9 | 441.3 | 20~77HR45N | ||
15T | HR15T | 1.5875mm鋼球 | 29.4 | 117.7 | 147.1 | 67~93HR15T |
30T | HR30T | 264.8 | 294.2 | 29~82HR30T | ||
45T | HR45T | 411.9 | 441.3 | 10~72HR45T |