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The Rockwell hardness test is a hardness test based on ... Very hard steel (e.g. chisels, quality knife ... Hardness Conversion Chart; Rockwell to brinell conversion ...
A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels.
The hardness of steel is usually stated as a number on the Rockwell C scale (HRC). The Rockwell scale is a hardness scale based on the resistance to indentation a material has. This differs from other scales such as the Mohs scale (scratch resistance testing), which is used in mineralogy.
Toggle the table of contents. Hardnesses of the elements (data page) 10 languages. ... Mohs hardness [1] Vickers hardness (MPa) [1] Brinell hardness
Fillet knife blades often have a Rockwell hardness in the mid to upper 50s placing them in the medium hardness range. [4] A medium hardness gives the blade moderate edge retention and relies on the thinness of the blade for flexibility rather than lack of hardness.
The addition of cobalt increases heat resistance, and can give a hardness up to 70 Rockwell C. [14] M35 M35 is similar to M2, but with 5% cobalt added. M35 is also known as Cobalt Steel, HSSE or HSS-E. It will cut faster and last longer than M2. [15] M42 M42 is a molybdenum-series high-speed steel alloy with an additional 8% cobalt. [14]
440C (UNS designation S44004) is a martensitic 400 series stainless steel, [1] and has the highest carbon content of the 400 stainless steel series. It can be heat treated to reach hardness of 58 to 60 HRC. It can be used to make rolling contact stainless bearings, e.g. ball bearings and roller bearings. It is also used to make knife blades.
As a result, the blades have an edge hardness of 62-63 on the Rockwell C scale whereas the tip, spine, and tang have a Rockwell hardness of 50-54. [1] This heat treatment was devised to develop phenomenal edge retention while preventing tip breakage and maintaining a degree of flexibility on the softer spine to improve the toughness of the knife.