Specifications include, but are not limited to: 1. Contractor must be able to provide Cutting Blades to the requesting departments, which meet or exceed the specifications contained in this document. 2. Unit prices for cutting blades shall include all costs associated with loading and hauling. The unloading areas shall be the East District Shop at 1360 Riverview Drive, Union, MO 63084 or 3401 HWY 50 Beaufort, MO. 63013 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. c. The tungsten carbide inserts shall have the following properties: *Cobalt content 10 to 12.5% *Density 14.1 to 14.6 *Hardness (Rockwell “A”) 87.5 to 89.0 *Transverse Rupture Strength 350,000 p.s.i. (minimum) 5. Moldboards are punched with holes 1/8 inch larger than the blade bolts. Accordingly, cutting blade punching will be of such accuracy, both for the spacing between the holes and for the spacing between the end hole and the end of the cutting blade, that the cutting blade will fit the moldboards, thus making the cutting blade sections interchangeable.
