This hardness test can be used in an abroad range of application for materials irrespective of hardness and size.It is the commonly-used hardness measure method for press diesRockwell hardness（HR＿）＿part is value of scale markThis hardness test can be abroadly used for material with nitrided surface, Carburized surface or thin specimens. Besides, the required calculations are the same between soft and hard.Vickers hardness（HV）Because indent is large for the relation between specimens’ load and test, it’s available for calculating average hardness of specimens.Brinell hardness（HB）It is extremely easy to operate as it is compact, portable and its indent is kept shallow compared with other tests. But it is easy to make measuring and man-made mistakes so the operator must be skillful.Shore hardness（HS）・A scale …Carbide・Ｂscale …Annealed part・Ｃscale …Quenched-tempered parts・Ｄscale …Nitrided part・Hardened layer （coating layer,induction quenched layer, Nitriding layer） ・Those of thin sheet or small specimens can not be tested by Rockwell hardness・Material ・Rolled material ・Forging part・Casting part・Large material with low mobility.Rolled material etc.・Indent is very shallow, therefore an indent is hardly left.This test is applied via a diamond or ball indenter following the order：minor load-major load-minor load. The hardness is measured by depth of penetration. For the minor load is 10 kgf, it is called Rockwell. For the minor load is 3 kgf, it is called Superficial Rockwell. The Vickers test is a square-based pyramid whose opposite sides meet at the apex at an angle of 136°A（steel or super hard alloy）ball indenter is used to indent the test surface. Hardness is given as a quotient divided by the surface area of the dent, computed from the diameter.A hammer is dropped from a uniform height. Hardness is based on how height the hammer bounces.JIS Z2245JIS Z2244JIS Z2243JIS Z22461124Hardness FeaturestestsApplicable examplesPrincipleReferenceHardness Test Methods
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