Kennametal Spec

KENNAMETAL CARBIDE TUNGSTEN INSERT SPECIFICATIONS

MHL SYSTEMS – SOLE SOURCE TO ABOVE

Specifications for Carbide Insert Snow Plow Blades

A – Blade                                                                                                                                                                                                        

1. Blades shall be (SAE 1020) flat steel (3/4″ x 5″); (3/4″ x 6″); (7/8″ x 5″) x (36″; 48″; 60″; 72″) x Tolerance

                       (+0″/-1/16″ length).

2. Punching shall be 11/16″ round holes for (5/8″) bolts; or 13/16″ round hole for (3/4″) bolts.
3. Location of holes shall be per customer’s requirements.
4. Tolerance for hole spacings shall be (+/-) 1/16″, non-accumulative, from center to center, across full length

                       of blades.

5. The groove for the carbide inserts shall be milled in the center of blade edges.

B – Carbide Inserts                                                                                                                                                                                       

1. The tungsten carbide insert shall be of trapezoidal design, with the following dimensions:

                                                Length:                  1″ nominal

                                                Width:                   .365″ (+/-) .005″  (Standard Width)

                                                ✸Height:              .625″ (+/-) .005″  (Standard Height)

                                                Bottom Angle:     25 degrees (+/-) 1 degree with a nose radius of 1-1/6″ minimun

                                Optional Insert Dimensions:

                                                Length:                  1″ nominal

                                                Width:                   .365″ (+/-) .005″  (Standard Width)

                                                ✸Height:              .750″ (+/-) .005″  (When Specified)✸

                                                Bottom Angle:     25 degrees (+/-) 1 degree with nose radius of 1-1/16″ minimum

2. The inserts shall be a high shock WC grade of tungsten carbide with (11 to 12-1/2) percent Cobalt

                                                content:

                                                Density: 14.1 Minimum to 14.6 Maximum

                                                Hardness:              87.5 Minimum to 89.0 Maximum RC. “A” Scale

                                                Transverse Rupture Strength (P.S.I.):            350,000 Minimum

                                                Porosity:                (Based on testing in accordance with ASTM designation B276-79)

                                                                                (A06 – B00 – C00)

3. The carbide insert manufacturer to furnish certification to customers that the inserts meet the specifications as set forth in B-2.

4. A Metallurgical evaluation of the carbide insert shall show no evidence of cross grade contamination.  Evaluation to be based on a photomicrograph of a polished and etched specimen at 500X magnification.

C – Brazing                                                                                                                                                                                                     

1. The Carbide Inserts shall be brazed on all sides with sound brazing practice, having no evidence of

                                                voids, with minimum shear strength of 30,000 PSI.  The filler material must not contain any cadmium.

2. The Carbide Inserts shall be placed in line within the milled groove.  Spacing shall be no more than

                                                .010″ between inserts the entire length of the cutting edge.

D – Finished Product                                                                                                                                                                                    

1. Complete snow plow blade lengths (36″, 48″, 60″, 72″) shall consist of 1″ length inserts determined

                                                by blade length (See: D-2).

2. Carbide tip points shall not exceed 1″ length of Carbide Insert for each 1″ length of blade section.

3. Finished blades shall comply with standard blade manufacturing tolerances.
4. Finished blades will be given one coat of rust resistant paint and marked with manufacturers’ identification and date of manufacture.  Front edges of the blade will be marked to avoid

                                                improper mounting.

5. Manufacturers’ literature or certifications showing physical properties of a grade carbide proposed

                                                shall be furnished as required.

E – Manufacturing in The USA                                                                                                                             

1. Product shall be manufactured entirely in the United States of America