3.2.3
Hardness Tests
Perform Brinell hardness test in accordance with ASTM E 10 and ASTM E 110.
The Brinell Hardness Number (BHN) of the weld and for the rail for a
distance of 150 mm 6 inches on each side of the joint shall be greater than
250. In the heat-affected zone (a distance not greater than 25 mm one inch
to each side of the joint) the BHN may be up to 20 points lower except for
the top of the rail, which shall be not less than 250. Check hardness on
at least 10 percent of all welds. Tests shall be performed on randomly
selected welds or as directed by the Contracting Officer.
-- End of Section --
SECTION 05652N
Page 10
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