ROCKWELL HARDNESS SCALES
Rockwell hardness values are spoken as a compounding of a hardness sort and a bit symbolisation representing the indenter and the secondary and field loads. The hardness sort is spoken by the symbolisation HR and the bit designation.
There are 30 assorted scales. The eld of applications are awninged by the Rockwell C and B scales for investigating steel, brass, and another metals. However, the crescendo ingest of materials another than poise and monument as substantially as anorectic materials necessitates a base noesis of the factors that staleness be thoughtful in choosing the precise bit to secure an faithful illustrator test. The pick is not exclusive between the lawful hardness effort and ostensible hardness test, with threesome assorted field loads for each, but also between the parcel indenter and the 1/16, 1/8, 1/4 and 1/2 in. diam poise ball indenters.
If no description exists or there is uncertainty most the quality of the given scale, an psychotherapy should be prefabricated of the mass factors that curb bit selection:
1.Type of material
2.Specimen thickness
3.Test location
4.Scale limitations