rockwell testing machine. this is probably the most common way of professionally and accurately checking the hardness of metals. a rounded steel ball or conical diamond tip is pushed into the metal and the depth of the indent is measured by the machine.
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the problem with asking for carbon steel specifically is most asian carbon steel knives tend to be at or above 59 hrc. if you specifically want a softer knife you might be better off going stainless (it 39;s not that stainless is necessarily softer than carbon btw - it 39;s just that the few vegetable cleavers that i happen to know of made of softer steel happen to be stainless probably because
hardness is a characteristic of a material not a fundamental physical property. it is defined as the resistance to indentation and it is determined by measuring the permanent depth of the indentation
2 inch diameter are used when testing materials such as steel-copper alloys aluminum and plastics to name a few. rockwell testing falls into two categories: regular rockwell testing (e.g. c and b scales) and rockwell superficial testing (e.g. 30 n and 30 t scales). high rockwell hardness numbers represent hard materials and low numbers soft
the principle of the rockwell hardness test is that both hardened steel ball and diamond cone will be used as the indenter. it is pressed into the specimen to make the indent in the specimen by applying minor and the major load.
3.1 macro hardness test methods 3.1.1 rockwell hardness test the rockwell hardness test method consists of indenting the test material with a diamond cone or hardened steel ball indenter. the indenter is forced into the test material under a preliminary minor load �0 (fig. 1a) usually 10 kgf. when equilibrium has been reached an
the choice is generally between the diamond indenter and the steel ball indenters with varying diameters. if the test specimen belongs to soft metal groups like copper alloys soft steel aluminum alloys etc. then a 1/16-inch diameter steel ball coupled with 100kgf test load is used and the hardness is represented as b on the scale.
for example steel we will go for the 10mm diameter ball with the applied load of the 3000 kg. rockwell hardness testing. in the rockwell test we use the depth of the penetration to determine the hardness of the material rather than the surface area to determine the hardness. (in brinell test we use the surface area of indent to determine the
this app is in conformance with astm a956-06 standard test method for leeb hardness testing of steel products and astm e140-07 for calculating approximate hardness conversion numbers for non
cutco knives are somewhat harder than wusthoff or henckels but softer than shun or global. we don 39;t have a rockwell hardness tester here but we think they 39;d test out at c-57 or 58. as a result it will hold an edge slightly longer and take slightly longer to sharpen. but like all knife makers selling them is an art.