Specifications include, but are not limited to: 1. BLADE
1.1 The blade shall be flat, hot-rolled finished steel of a chemistry and/or grade to match SAE
1.2. The groove for the carbide inserts shall be milled in the center of the blade edge.
( ) ( ) 2. CARBIDE
2.1 The inserts shall be a high shock WC grade of Tungsten Carbide with 10-12% cobalt content.
Density: 14.1 (Minimum) to 14.6 (Maximum) grams/cm³
Hardness: 87.5 (Minimum) to 89.0 (Maximum) Rockwell “A” scale
Transverse Rupture Strength: 350,000 to 400,000 PSI
2.2 The inserts shall be designed to meet the customer’s specifications where listed, or as a
standard design of the following dimensions:
Height: .635” ± .010 (Long side)
Width: .365” ± .005
Length: 1” Nominal
Bottom Angle: 25º with a nose radius of 1/16” minimum.
( ) ( ) 3. BRAZING
3.1 The brazing material shall be a high strength alloy type. The braze shear strength to be 30,000
3.2 The tungsten carbide inserts shall be positioned in the milled groove at .010 between the
inserts along the entire length of each cutting edge section.
3.3 The inserts shall be brazed on all sides consistent with sound brazing practices, and no
evidence of voids or use of shims.
3.4 Each blade section shall contain one insert of 1” nominal length per each inch of blade section
length. (Reference 2.2)
( ) ( ) 4. EMBEDDING
4.1 The crushed carbide shall be the “blocky” type which penetrates and compacts in the mold
4.2 The crushed carbide shall be applied in a hot wire (tig) process to a puddle depth of 3/16” in
the parent metal.
( ) ( ) 5. SPECIFIC REQUIREMENTS
5.1 Each blade section shall be identified with manufacturer’s identification mark stamped or
stenciled on each end of the section.
5.2 The finished blade sections shall have markings showing the front edge of the blade to avoid