Scale |
Indenter |
Preliminary |
Total |
Application |
HRA | Diamond |
10 |
60 |
Cemented carbides, thin steel, shallow case-hardened steel |
HRB | Ball 1/16” dia. |
10 |
100 |
Cu and Al alloys; soft steels, malleable iron, annealed low C steels, etc. |
HRC | Diamond |
10 |
150 |
Hard steels, hard cast irons, pearlitic malleable iron, titanium, deep case-hardened steel, etc. |
HRD | Diamond |
10 |
100 |
Thin hard steel, med. case-hardened steel, and pearlitic malleable iron |
HRE | Ball 1/8” dia. |
10 |
100 |
Al and Mg alloys; cast iron, bearing metals |
HRF | Ball 1/16” dia. |
10 |
60 |
Annealed Cu alloys, thin soft sheet metals |
HRG | Ball 1/16” dia. |
10 |
150 |
Bronze (Cu-Ni-Zn and Cu-Ni alloys), malleable irons |
HRH | Ball 1/8” dia. |
10 |
60 |
Soft materials, high ferritic, Al, Pb, Zn |
HRK | Ball 1/8” dia. |
10 |
150 |
Bearing metals and other very soft or thin materials, such as thermoplastics, thermosets, rubbers |
HRL | Ball ¼” dia. |
10 |
60 |
|
HRM | Ball ¼” dia. |
10 |
100 |
|
HRP | Ball ¼” dia. |
10 |
150 |
|
HRR | Ball ½” dia. |
10 |
60 |
|
HRS | Ball ½” dia. |
10 |
100 |
|
HRV | Ball ½” dia. |
10 |
150 |
|
HR 15N | Diamond |
3 |
15 |
Rockwell superficial scales are used to test materials too thin for the regular scales. Generally, the diamond indenter are used for hard materials, and ball indenters are used on soft material Hardness tests used for thin sheets, foils, coatings, surface heat treatments, and polymers including their surface treatments |
HR 30N | Diamond |
3 |
30 |
|
HR 45N | Diamond |
3 |
45 |
|
HR 15T | Ball 1/16” dia. |
3 |
15 |
|
HR 30T | Ball 1/16” dia. |
3 |
30 |
|
HR 45T | Ball 1/16” dia. |
3 |
45 |
|
HR 15W | Ball 1/8” dia. |
3 |
15 |
|
HR 30W | Ball 1/8” dia. |
3 |
30 |
|
HR 45W | Ball 1/8” dia. |
3 |
45 |
|
HR 15X | Ball ¼” dia. |
3 |
15 |
|
HR 30X | Ball ¼” dia. |
3 |
30 |
|
HR 45X | Ball ¼” dia. |
3 |
45 |
|
HR 15Y | Ball ½” dia. |
3 |
15 |
|
HR 30Y | Ball ½” dia. |
3 |
30 |
|
HR 45Y | Ball ½” dia. |
3 |
45 |