Specifications include, but are not limited to: Item #’s 1 – 8 (For through hardened, single and double bevel scraper blade): Yes No Material shall be hot rolled steel bars A.I.S.I. 15b30. Yes No Chemical Analysis shall be: Carbon .29/ .34, Manganese .85/1.10, Phosphorus .020 max., Sulfur .025 max., Silicon .15/.30, Boron .003 max. Yes No The ¾” wearing edge shall be hardened front and back with a primary and secondary hardness. The surface area shall have a Rockwell C hardness of 50 +/- 3, and the core area shall have a Rockwell C hardness of 45 +/- 3.12-volt electric powered hydraulic unit. Yes No Tensile strength shall be 215,000 P.S.I. Yes No Length as noted in the bid shall not be exceeded and shall not be shorter than specified + or - 1/8”. Ends shall be square and cleanly cut. Yes No Punching shall conform to AASHTO standard bolt hole spacing for all even and half foot lengths punched 11/16” diameter for 5/8” bolts and shall mount on Root and Henke underbodies. Yes No Each blade shall have a legible identifying mark indicating through hardened type blade. Blades shall be guaranteed against breakage in normal use. Item #’s 9 - 13 (For Carbide, scraper blade): Yes No Thickness shall be .750 inches subject to standard steel mill tolerances. Yes No Width shall be 6.00 inches. Yes No Length shall be 60 inches. Yes No Punching shall conform to AASHTO standard bolt hole spacing for all even and half foot lengths punched 11/16” diameter for 5/8” bolts and shall mount on Root and Henke underbodies. Tungsten Carbide Tips: Yes No Material shall be standard rock drill grade, 88% carbide – 12% cobalt to 89% carbide – 11% cobalt composition. Yes No Shape shall be “Trapezoid” twenty-five degrees. Yes No Thickness shall be .365 inches to .005 inches. Yes No Height shall be .635 inches minimum. Yes No Length shall be 1.125 inches maximum - .500 inches minimum, nominal 995 inches. Yes No Hardness shall be 88.2 Rockwell A. Yes No Density shall be 14.35 grams minimum. Yes No Traverse Rupture Strength shall be 370,000 P.S.I.
