The cutting edge may have a Rockwell C hardness of at least about 50, while the inner tube has a Rockwell C hardness of no more than about 40.

Alloys of the present invention have a Rockwell C hardness greater than 50.

R 12 Verification and calibration of Rockwell C hardness standardized blocks;

The Berco tracks have surface hardness of C55 Rockwell, a depth hardness of C45 Rockwell (from 5 to 13 mm) and core hardness of C30 Rockwell.

The coating has a Rockwell C hardness of 56 to 70 and a surface roughness of less than or equal to 250 microinches rms.

The torsion bar is fabricated from a material having a hardness greater than 45 Rockwell C-Scale.

Another type of turning is hard turning which turns regular materials into hard materials with Rockwell C hardness higher than 45.

Hard turning is a type of turning done on materials with a Rockwell C hardness greater than 45.

Hard turning is a turning done on materials with a Rockwell C hardness greater than 45.

A method of forming a reconstituted slate roofing tile having a matt surface utilises a mould (10) comprising a mould body (20) incorporating a moulding surface which includes a region defined by a material having a Rockwell C hardness of at least 40.

The stationary roller shaft is formed of a material having a hardness of at least 66 Rockwell C and having a low inclusion content rating, thereby providing improved wear and/or fatigue properties.