Tungsten Carbide Inserts. a. The inserts shall be a high shock WC grade of tungsten carbide with 11 to 12.5 percent cobalt content. Hardness: 87.5 minimum to 89.0 Maximum Rc. “A” scale. Transverse rupture strength (p.s.i.): 350,000 Minimum. Porosity: (Based on testing in accordance with ASTM designation B276-79) A06 B02 C00 b. The carbide insert manufacturer to furnish certification to WSDOT that the inserts meet the specifications as set forth in section an immediately above. c. The inserts shall be a trapezoid design of the following dimensions: Height: .635” +/- .005 (long side) Width: .365” +/- .010 Length: 1” Nominal Bottom Angle: 25 Degrees with a nose radius of 1/16” minimum d. A metallurgical evaluation of the carbide insert shall show no evidence of cross grade contamination. Evaluation to be based on a photomicrograph of a polished and etched specimen at 500x magnification.
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Sources: Statewide Contract, Statewide Contract, Statewide Contract