Exhibit 2 Specification for Cutting Edges with Tungsten Carbide Inserts for Moldboard Assemblies.docx

Exhibit 2 Specification for Cutting Edges with Tungsten Carbide Inserts for Moldboard Assemblies DESCRIPTION: This specification covers requirements for replaceable cutting edges with tungsten carbide inserts to be used on motor graders and underbody truck scrapers.

BLADE: The blade shall be flat hot-rolled finished steel, SAE 1020. All bolt holes shall be located, dimensioned, and countersunk as shown on the attached drawing. Punching shall conform to American Association of State Highway and Transportation Officials (AASHTO) standard bolt hole spacing for even and half foot length, punched 11/16” square holes for 5/8” bolts. Blade thickness to be 7/8”.

Length of blade shall be as noted in the bid proposal + or - 1/8” specified in order to fit total moldboard in various combinations. The ends shall be square and cleanly cut.

MARKING: Each blade shall be legibly stamped with the manufacturer identification and year of manufacture. Complete blades are to be rust resistant painted or lacquered except for insert and brazing which shall be protected from paint by means of masking tape or other method. Color shall be yellow for identification.

INSERTS: Inserts shall be cemented tungsten carbide of rectangular design and shall be dimensioned and located in the blade as shown on the attached drawing. Inserts shall be positioned in the blade groove so that the bottom of the insert is flush with the bottom of the blade within +/- 1/16 inch. Physical properties of the inserts shall be as follows.

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APPROVED TUNGSTEN CARBIDE: Kennametal 3030 or demonstrated equal. Carbide insert manufacturers showing advertised physical properties tabulation for grade carbide proposed shall be submitted with each bid without exception. The tungsten carbide insert shall be made of virgin material.

BRAZING: The tungsten carbide inserts shall be securely brazed over the entire length and surface of the blade groove consistent with sound brazing practice with no evidence of voids or use of shims. The tungsten carbide inserts shall be positioned in the milled groove at .010” between the inserts and entire length of each cutting edge section. Brazing gaps, excessive voids or oxidized surfaces not holding brazing material shall be cause for rejection.

The brazing material shall be a high strength alloy type. The rated shear strength of the braze material shall be 30,000 P.S.I. (minimum). Certification, that meets the required specifications, from the manufacturer of the braze material is required to be submitted to the Program Manager or their designee.

BOLTS, NUTS AND WASHERS: Bolts, nuts, and washers are not to be furnished unless specifically requested by the State.

SPECIFIC REQUIREMENTS: Cutting edges shall be of the length specified in the request for quotations. The furnished cutting edge shall be free of warping and other defects and longitudinal deviation from a straight line shall not exceed 1/8 inch per 4 feet of length. The difference between the highest and lowest tip point not exceed 1/32 inch on any given blade assembly.

The contractor shall furnish the Program Manager with a certified test result of Rockwell Hardness, Transverse Rupture Strength, Density, Cobalt Content and Porosity (ASTM Designations as above) for each cemented carbide lot or batch, used in fabricating the cutting edges. Reclaimed hard scrap tungsten carbide is not acceptable. Each test sample shall meet the specified physical requirements.

The contractor shall also provide written certification that states the blades shipped meet all the requirements contained in the specification to the Program Manager or designee upon delivery.

A loss of 6” or more of tungsten carbide inserts per cutting edge during normal usage shall be considered brazing failure.

TESTING: Prior to issuing a delivery order the contractor shall be required to furnish each type of blade bid for examination and testing within ten (10) business days of notification. Two blades per shipment (a shipment shall be considered any delivery that takes place within a three (3) week period or four (4) blades per yearly purchase order, whichever is greater, shall be sampled and tested by the MDOT or an authorized/independent third-party testing provider before final acceptance and payment is made. The testing blades are not included in the overall order amount.

INSPECTION: All cutting edges will be inspected by the State for compliance with the specifications. The inspection may be performed at the place of manufacture and, if the State elects, may be undertaken subsequent to delivery. When performed at the place of manufacture, the Inspector representing the State shall have free entry to all parts of the manufacturer’s plant which concern the production of the cutting edges ordered. If the cutting edges fail to meet the requirement of the specifications, they will be rejected, and the material returned to the contractor without any charges to the State.

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