Rockwell Ball Mills . PRACTICAL HARDNESS TESTING MADE SIMPLE. ROCKWELL HARDNESS TESTING 17 6. INFORMATIONS 22 . spherical hardened steel ball of 10 mm pressed against the test surface using a static force of 3000 kg (=29.42 kiloNewton) for at least 10 seconds for steel and measuring the diameters of the indentation left on the surface by means of a graduated low .
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