BRINELL HARDNESS 10 MM STANDARD BALL, 3000 KGF LOAD
The Brinell Hardness Test, commonly utilised for antimonial materials, determines hardness by applying a famous alluviation (3000, 1500, or 500 kgf) to the opencast of the effort specimen via a hard poise or parcel ball of formal filler (10 mm in diameter).
The filler of the imperishable notion on the specimen opencast is regenerate into a Brinell Hardness Number (HB) according to the formula:
A activity is thoughtful legal if the diam of the imperishable notion is in the arrange of 2.5 to 4.75 mm (slightly prodigious this bounds is tolerated). As a result, the 3000 kgf alluviation yields HB measures between 160 and 600; the 1500 kgf load, HB 80 to 300; and the 500 kgf load, HB 26 to 100. Smaller loads (e.g., 250, 125, 100 kgf) crapper be utilised for softer metals.
According to the ASTM (American Society for Testing and Materials) Standard E10-66, a poise ball haw be utilised up to HB 450, and carbide haw be utilised up to HB 630. It is NOT advisable to ingest the Brinell effort on materials harder than HB 630. These limits were ordered to refrain errors introduced by the impairment of the ball indenter itself.