Specifications include, but are not limited to: 3. Steel Blades -When sampled and tested in accordance with the designated methods set forth in ASTM E 30, the following chemical requirements shall apply. Motor Grader and Snow Plow Blades Min Max Carbon (C), Percent, (Direct Combustion Method) 0.75 0.98 Manganese (Mn), Percent, (Bismuthate Method) 0.60 0.90 Phosphorus (P), Percent, (Alkalimetric Method) --- 0.04 Sulfur (S), Percent, (Evolution Method) --- 0.05 Silicon (Si), Percent, (Sulfuric Acid Method) --- 0.30 The Brinell Hardness, (ASTM E10) shall be a minimum of 250 and a maximum of 325. 4. Carbide tip blades -constructed from flat steel ¾" x 6" material meeting A-36, M1020 Specifications, and these specifications. a. One-inch (nominal) tungsten carbide inserts shall be brazed into a milled slot in the center of the blade edge. Inserts shall be continuous the full length of the blade. All inserts shall be manufactured from virgin material. b. Brazing shall be on all sides of insert, without voids and shall have a shear strength of not less than 30,000 p.m.
