Specifications include, but are not limited to: 1. SCOPE: This specification describes snow plow blades for use in winter highway operations. Blades furnished shall meet the following requirements: EXAMPLES: Valk Viper© Chemung- Evolution Edges or TxDOT approved equal. NOTICE TO RESPONDENT: Any example shown is listed to show type and class of item desired. Bidders are cautioned to read the specifications carefully, as there may be special requirements. Do not assume your standard item meets all detailed specifications merely because it is listed as an example. Bidders are cautioned that any item delivered to the FOB point which does not meet specifications in every aspect will not be accepted. 2. Regular Steel Snow Plow Blades: Blades shall be constructed in accordance with American Society for Testing and Materials (ASTM) A36 or ASTM A29 standards. 2.1. Blades shall be of typical SAE- AISI grade for this application: 1084, 1090, etc. 2.2. Blades shall be manufactured to a uniform range on the Rockwell “C” R(c) and 2 - 4 Brinell scales. Hardness testing shall be in accordance with the current versions of ASTM E-18 and ASTM E-10 through E-14. Hardness Range Rockwell C Scale Min 24 Max 36 Brinell Scale 215 337 2.3. Length, Width, and Thickness of the blade will be specified on the solicitation. Tolerances shall be +1/16” to -3/32” width from spec and +/- 1/8” length from spec. 3 foot Blades shall be straight and flat within 1/8 inch. 4 foot blades shall be straight and flat within 3/16 inch. Longer blades shall be straight and flat within ¼ inch over 5 feet. 2.4. Blades shall have standard AASHTO square highway punching holes for 5/8” bolts. Holes shall be countersunk 11/16 inch on the cutting side, to allow bolt head align flush with surface of blade. Holes shall be spaced 12 inches center to center on a straight line and located within .06 inch of true position using both ends as reference points. The .06 inch shall be ± non-accumulative. The first hole on the left shall be spaced 3 inches from the end with the second hole 3 inches from the first hole. The right end of the blade shall be spaced the same as the left end. Height from top of blade will be two inches on center. 2.5. Blades shall be coated with a rust-preventative solution. 3. Tungsten Carbide Insert Blades: Blades shall be constructed in accordance with American Society for Testing and Materials (ASTM) A36 or ASTM A29 standards. 3.1. Blades shall be of typical SAE- AISI grade for this application: 1020, 1021, 1025, 1026, A36, etc. 3.2. Blades shall be manufactured to a uniform range on the Rockwell B (Rb) and Brinell scales. Hardness testing shall be in accordance with the current versions of ASTM E-18 and ASTM E-10 through E-14. Hardness Range Rockwell B Scale Min 66 Max 73 Brinell Scale 119 235 3.3. Length, Width, and Thickness of the blade will be specified on the solicitation. Tolerances shall be +1/16” to -3/32” width from spec and +/- 1/8” length from spec. Blades shall be straight and flat within ¼ inch over 5 feet. 3.4. Blades shall have standard AASHTO square highway punching holes for 5/8” bolts. Holes shall be countersunk 11/16 inch countersunk on the cutting side, to allow bolt head align flush with surface of blade. Holes shall be spaced 12 inches center to center on a straight line and located within .06 inch of true position using both ends as reference points. The .06 inch shall be ± non-accumulative. The first hole on the left shall be spaced 3 inches from the end with the second hole 3 inches from the first hole. The right end of the blade shall be spaced the same as the left end. Height from top of blade will be two inches on center. 3.5. Carbide Inserts shall be constructed of a high shock WC. Inserts shall have the following characteristics: Cobalt Content 11% to 14% Density 14.1 – 14.6 Hardness 87.5 to 89.0 Rockwell A R(a) 170-185 Brinell 3 - 4 Porosity A06, B00, C00 Rupture Strength 350,000 to 450,000 psi 3.6 The shape and size of the insert shall be determined by the individual product. The tolerance on each dimension shall be as follows: 0.635 Height +/-.005” 0.365 Width +/- .005” Length 1” nominal Bottom Angle = 25 degrees, with a nose radius of 1/16 inch, minimum 3.7. Brazing material shall be a high strength high temp alloy type. Inserts will be placed next to each other in the milled slot along the entire length of the cutting edge. Inserts shall be braised on all sides consistent with sound brazing practice with no evidence of voids or use of shims. 3.8. Each blade shall contain one insert, one inch nominal length for each inch of the blade sections overall length. Several inserts in each blade may be slightly longer or shorter to ensure there will be no inserts extending from the ends of the steel portion of the blade. 3.9 Milled Slot 3.9.1 Slot Width .375” +/- .005 3.9.2 Slot Depth .635” +/- .005 3.10 Additional Specifications 3.10.1 The difference between the highest and lowest tip point on any two adjacent inserts is not to exceed 1/32” on any given blade assembly. 3.10.2 Longitudinal deviation will not exceed 1/8” in a 4’ blade section. 3.11 Blades shall be coated with a rust preventative solution. 3.12 Testing: Blades with inserts shall be tested using one or all of these standards: ASTM B276-05, B294-10, B311-08, B390-92, and E-10 through E-14.
