Specifications include, but are not limited to: 1. STEEL SNOWPLOW BLADE CUTTING EDGES (Item 2,5,6,7,8,11,12 and 13 in Exhibit B): Steel Snowplow Blades must be constructed of C-1085 hot rolled steel that conforms to the following requirements: a. Steel Element Properties: i. Carbon: 0.80% min. – 0.93% max. ii. Manganese: 0.60% min. – 0.90% max. iii. Phosphorus: 0.05% iv. Sulphur: 0.05% v. Silicon: 0.03% vi. Brinell Hardness: 220 min. – 270 min. b. Blade Fabrication: i. Maximum variation of thickness must be plus or minus 1/16”. ii. The length and width of all blades must be as indicated on Attachments 1,2,3,4,5,7,8, and 9 with a maximum tolerance of plus or minus 1/16”. All edges to be clean cut with no burrs. Flame cuts will not be accepted. iii. Bolt hole punching must be square holes to receive 5/8” #3 plow bolts. Round holes will not be accepted. iv. Bolt hole sizes, location and spacing must be as indicated on Attachments 1,2,3,4,5,7,8, and 9. Horizontal and vertical centerline tolerances must be plus or minus 1/16”. c. Painting: All Snowplow Blades must be painted with a lead-free, rust inhibiting paint on all sides. 2. TUNGSTEN CARBIDE SNOWPLOW BLADE CUTTING EDGES (Item 1, 3 and 4 in Exhibit B): Tungsten Carbide Snowplow Blades must be constructed of ¾” C-1085 hot rolled steel with tungsten carbide inserts brazed into bottom edge, and conform to the following properties: a. Carbide Insert Properties: i. Cobalt Content: .28% min. – 12.5% max. ii. Hardness: 87.5 min. – 88.5 max. Rockwell “A” iii. Density: 14.1 min. – 14.6 max. GMSLCC iv. Transverse Rupture Strength: 350,000 PSI min. b. Carbide Insert Dimensions: i. Shape: Trapezoid ii. Height: 0.635” +/- 0.005 iii. Width: 0.365” +/- 0.005 iv. Length: 1” nominal v. Bottom Angle: 25-degrees with a nose radius of 1/16” minimum c. Blade Fabrication: i. Blades must be fabricated in accordance with the dimensions and details shown on Attachments 1,2,3,4,5. ii. A groove must be milled in the center of the bottom side of the edge for the tungsten carbide inserts. iii. The milled groove must be the entire length of the edge. iv. Each Tungsten carbide insert must be individually brazed on all sides using sound brazing practices. There must be no voids or use of shims. v. The brazing material must be a high strength silver nickel alloy type with a shear strength of 70,000 PSI minimum. d. Painting: All Snowplow Blades must be painted with a lead-free, rust inhibiting paint on all sides. 3. UNDERBODY SCRAPPER BLADES (Item 9 in Exhibit B): Underbody scrapper blades must be a curved type constructed of ¾” through hardened, hot rolled Boron steel that conforms to the following requirements: a. Steel Properties: i. Carbon: 0.27% min. – 0.35% max. ii. Manganese: 0.70% min. – 1.20% max. iii. Phosphorus: 0.03% max. iv. Sulphur: 0.01% max. v. Silicon: 0.15% min. - 0.35% max. vi. Brinell hardness: 400 - 512 b. Blade Fabrication: i. Blades must be fabricated in accordance with the dimensions and details shown on the Attachment 9. ii. Maximum variation of thickness must be plus or minus 1/16”. iii. Blades to have a 30-degree beveled edge both sides the entire length of the blade. iv. The length and width of all blades must be as indicated on Attachment 6 with a maximum tolerance of plus or minus 1/16”. All edges must be clean cut with no burrs. Flame cuts will not be accepted. v. Bolt hole punching must be countersunk square holes to receive 5/8” #8 plow bolts. Round holes will not be accepted. Bolt hole sizes, location and spacing must be as indicated on Attachment 6. Horizontal and vertical centerline tolerances must be plus or minus 1/16”. c. Painting: All Snowplow Blades must be painted with a lead-free, rust inhibiting paint on all sides.
