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Saeco to Brinell Hardness Conversion Chart

This is a representation of the chart that Saeco ships with their Bullet Hardness Tester. I have modified and enlarged it for easier viewing.

The chart also shows the relative hardness that may be expected when alloying various ratios of Tin/Lead by using the following formula.

BH = ( 222.5 x R - 7.82 x R x R ) / ( 1 + 23.12 x R ) + 5

Let "R" equal a Ratio which is the weight of the Tin in the alloy divided by the total weight of the alloy...Then:

1 part tin plus 19 parts lead (by weight) equals a 1 in 20 alloy

Then 1
/ 20 = 0.05..... So then R = 0.05..... Therefore:

BHN = ( 222.5 x 0.05 - 7.82 x 0.05 x 0.05 ) / ( 1 + 23.12 x 0.05 ) + 5

The Brinell Hardness Number of a 1 in 20 Tin-Lead alloy = 10.15

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Last revised: November 7, 2001.