11011_specs.pdf

State of South Dakota - Snow Plow Cutting Edges - Specifications

All deliveries will be made via flatbed, on pallets, to facilitate unloading from the side with a forklift.

Line 1

1. PLOW BLADE – CARBIDE TIP (25° Trapezoid shape)

a. Plow blades will be 3/4”x 6” with a center bolt-hole distance of 2” from the top and will be hot-rolled SAE 1020 through 1045 quality steel.

b. To be made available in 3-foot and 4-foot sections.

c. Hole punching will be 11/16” square and countersunk to receive 5/8” bolts.

d. Location and spacing of the hole will be per AASHTO standards for “HEAVY-DUTY” punching.

e. Tolerance for bolt-hole location will be 1/32”.

f. A groove for the carbide inserts will be milled in the center of the blade edge.

2. CARBIDE BLADE INSERTS

a. Inserts will be made of the following materials:

i. 87-89% tungsten carbide

ii. 11-12% cobalt

iii. 1% maximum for all other elements

b. Inserts will be 25° trapezoidal with the following nominal dimensions:

i. Length: 1” ± 0.005”

ii. Thickness: 0.365” ± 0.005”

iii. Height: 0.635” ± 0.005” (measured on the long side)

iv. Nose Radius: 1/16”

c. Inserts will have the following properties:

i. Hardness: 88.0-90.5 HRA per ASTM B294-92

ii. Density: 14.4-14.5 g/cc per ASTM 311-08

iii. Porosity: A04 = 0.06%, B02 = 0.02%, C04 = 0.06% per ASTM B276-05e1

iv. Transverse rupture strength of 351,000 psi, minimum.

d. All surfaces (internal and external) will be free of cracks and laminations.

e. The carbide insert manufacturer is to furnish certification to the South Dakota

Department of Transportation (SDDOT) that the inserts meet the specifications.

f. The insert manufacturer is also to certify that the inserts meet virgin tungsten carbide quality specifications.

3. BRAZING

a. Carbide inserts will be spaced in the milled groove with .010” between the inserts for the entire length of each blade section.

b. The inserts will be brazed on all sides, leaving no voids or shims.

c. The brazing material will be a high-strength alloy, with a minimum shear strength of

30,000 psi.

d. There will be no gaps or spacing between adjacent inserts after brazing.

4. SPECIAL REQUIREMENTS

a. The complete cutting edge will consist of a combination of three sections with the two end sections interchangeable.

b. The difference between the highest and lowest tip points is not to exceed 1/32” on any blade assembly.

c. The finished blade sections will be free of warpage and longitudinal deviation not to exceed 1/8” in a four-foot blade section.

d. Each blade section will be identified with the manufacturer's identification stamp on each end of the section.

e. The finished blade sections will have markings showing the front edge of the blade to avoid improper mounting.

f. The bidder will send with each shipment an analysis of carbide inserts showing Cobalt %, Hardness, Density, Porosity, and Traverse Rupture Strength for the accompanying shipment.

g. Blueprints of the cutting-edge punching are to accompany the bids.

Line 2

1. PLOW BLADE – CARBIDE TIP (Bullnose shape)

a. Plow blades will be 3/4”x 6” with a center bolt-hole distance of 2” from the top and will be hot-rolled SAE 1020 through 1045 quality steel.

b. To be made available in 3-foot and 4-foot sections.

c. Hole punching will be 11/16” square and countersunk to receive 5/8” bolts.

d. Location and spacing of the hole will be per AASHTO standards for “HEAVY-DUTY” punching.

i. 87-89% tungsten carbide

ii. 11-12% cobalt

iii. 1% maximum for all other elements

b. Inserts will be bullnose shape with the following nominal dimensions:

i. Length: 1” ± 0.005”

ii. Thickness: 0.365” ± 0.005”

iii. Height: 0.750” ± 0.005” (total height, including bullnose radius)

iv. Nose Radius: 3/16”

c. Inserts will have the following properties:

i. Hardness: 88.0-90.5 HRA per ASTM B294-92

ii. Density: 14.4-14.5 g/cc per ASTM 311-08

iii. Porosity: A04 = 0.06%, B02 = 0.02%, C04 = 0.06% per ASTM B276-05e1

iv. Transverse rupture strength of 351,000 psi, minimum.

d. All surfaces (internal and external) will be free of cracks and laminations.

e. The carbide insert manufacturer is to furnish certification to the South Dakota

Department of Transportation (SDDOT) that the inserts meet the specifications.

the entire length of each blade section.

b. The inserts will be brazed on all sides, leaving no voids or shims.

c. The brazing material will be a high-strength alloy, with a minimum shear strength of

30,000 psi.

end sections interchangeable.

b. The difference between the highest and lowest tip points is not to exceed 1/32” on any blade assembly.

c. The finished blade sections will be free of warpage and longitudinal deviation not to exceed 1/8” in a four-foot blade section.

d. Each blade section will be identified with the manufacturer's identification stamp on each end of the section.

e. The finished blade sections will have markings showing the front edge of the blade to avoid improper mounting.

f. The bidder will send with each shipment an analysis of carbide inserts showing Cobalt %, Hardness, Density, Porosity, and Traverse Rupture Strength for the accompanying shipment.

g. Blueprints of the cutting-edge punching are to accompany the bids.

Line 3

1. PLOW BLADE – RUBBER ENCASED STEEL SEGMENTS

a. Plow blades will be 7/8”x 6” with a center bolt-hole distance of 1.5” from the top of the blade on 12” centers and will be hot-rolled SAE 1045 quality steel.

b. To be made available in 3-foot and 4-foot sections.

c. Each blade will have the blade orientation embossed in the rubber casing.

d. Hole punching will be 11/16” square and countersunk to receive 5/8” bolts.

e. Location and spacing of the hole will be per AASHTO standards for “HEAVY-DUTY” punching.

f. Tolerance for bolt-hole location will be 1/32”.

g. A groove for the carbide inserts will be milled in the center of the blade edge.

i. 87-89% tungsten carbide

ii. 11-12% cobalt

iii. 1% maximum for all other elements

b. Inserts will be bullnose shape with the following nominal dimensions:

i. Length: 1” ± 0.005”

ii. Thickness: 0.365” ± 0.005”

iii. Height: 0.755” ± 0.005” (total height, including bullnose radius)

iv. Nose Radius: 3/16”

c. Inserts will have the following properties:

i. Hardness: 88.0-90.5 HRA per ASTM B294-92

ii. Density: 14.4-14.5 g/cc per ASTM 311-08

iii. Porosity: A04 = 0.06%, B02 = 0.02%, C04 = 0.06% per ASTM B276-05e1

iv. Transverse rupture strength of 351,000 psi, minimum.

d. All surfaces (internal and external) will be free of cracks and laminations.

e. The carbide insert manufacturer is to furnish certification to the South Dakota

Department of Transportation (SDDOT) that the inserts meet the specifications.

the entire length of each blade section.

b. The inserts will be brazed on all sides using Nickel/Silver braze, leaving no voids or shims.

c. The brazing material will be a high-strength alloy, with a minimum shear strength of

70,000 psi.

d. There will be no gaps or spacing between adjacent inserts after brazing.

e. Each blade section is to contain one insert with a 1-inch nominal length for each inch of blade section length.

end sections interchangeable.

b. The difference between the highest and lowest tip points is not to exceed 1/32” on any blade assembly.

c. The finished blade sections will be free of warpage and longitudinal deviation not to exceed 1/8” in a four-foot blade section.

d. Each blade section will be identified with the manufacturer's identification stamp on each end of the section.

e. The finished blade sections will have markings showing the front edge of the blade to avoid improper mounting.

f. The bidder will send with each shipment an analysis of carbide inserts showing Cobalt %, Hardness, Density, Porosity, and Traverse Rupture Strength for the accompanying shipment.

g. Blueprints of the cutting-edge punching are to accompany the bids.

Line 4

1. PLOW BLADE – RUBBER ENCASED STEEL SEGMENTS – CLAMP BAR

a. The clamp bar will be of SAE 1045 Structural grade hot rolled steel.

b. Dimensions: 1/2” thick by 3” high

c. Tolerance between hole spacing is ± 1/16”, non-accumulative, from center to center across the full length of the Clamp Bar to match the main blade hole pattern.

d. Punched for a 5/8” Carriage bolt and matching the bushing pattern on the blade.

Line 5

1. PLOW BLADE – CUSHION MOUNTED STEEL CARBIDE BLADE

a. Plow blades will be 7/8”x 6” with 3” holes to accept vibration-absorbing bushings.

b. Cushion mounted on 12” centers steel carbide blade.

c. The bushings are 1.75” from the top of the blade on 8” or 12” centers to facilitate mounting on the plow.

d. To be made available in 3-foot and 4-foot sections.

2. VIBRATION ABSORBING BUSHING

a. Bushing will be thermoplastic polyurethane and made using press molding methods rather than injection molding.

b. Outside diameter will be 3” and include a hardened steel insert at its center.

c. The insert will have a diameter of 1” and an inside diameter of 11/16”.

3. HARDENED SHIELD

a. Will have a hardened shield measuring 1/4” by 1 ½” wide and welded to the blade's leading face to extend the steel holder's life.

4. CARBIDE BLADE INSERTS

i. 87-89% tungsten carbide

ii. 11-12% cobalt

iii. 1% maximum for all other elements

b. Inserts will be bullnose shape with the following nominal dimensions:

i. Length: 1” ± 0.005”

ii. Thickness: 0.365” ± 0.005”

iii. Height: 0.755” ± 0.005” (total height, including bullnose radius)

iv. Nose Radius: 3/16”

c. Inserts will have the following properties:

i. Hardness: 88.0-90.5 HRA per ASTM B294-92

ii. Density: 14.4-14.5 g/cc per ASTM 311-08

iii. Porosity: A04 = 0.06%, B02 = 0.02%, C04 = 0.06% per ASTM B276-05e1

iv. Transverse rupture strength of 351,000 psi, minimum.

d. All surfaces (internal and external) will be free of cracks and laminations.

e. The carbide insert manufacturer is to furnish certification to the South Dakota

Department of Transportation (SDDOT) that the inserts meet the specifications.

5. BRAZING

a. The inserts will be brazed on all sides using nickel/silver braze, leaving no voids or shims.

b. The brazing material will be a high-strength alloy, with a minimum shear strength of

70,000 psi.

c. Braze Composition properties:

i. Copper/Silver = 46-50%

ii. Silicone = 0.04-0.25%

iii. Nickel = 9.0-11.0%

iv. Phosphorus = 0.25%

v. Aluminum = 0.01%

vi. Lead = 0.05%

vii. Zinc = remainder

6. SPECIAL REQUIREMENTS

a. The difference between the highest and lowest tip points is not to exceed 1/32” on any blade assembly.

b. Each wear blade will have a legible identifying mark indicating the manufacturer, specifying bolt use, and the bolt tightening requirements.

c. Blueprints of the cutting-edge punching are to accompany the bids.

Line 6

1. PLOW BLADE – CUSHION MOUNTED STEEL CARBIDE BLADE – CLAMP BAR

a. The clamp bar will be of SAE 1045 Structural grade hot rolled steel.

b. Dimensions: 5/8” thick by 3” high

c. This clamp has SAE J740 plow bolt holes located on 12” centers to align with the bushings in the blade.

Line 7

1. SECTIONAL DUAL CARBIDE STYLE BLADES

a. Plow blades will be 7/8” thick x 5” wide, with a center bolt-hole distance of 1.50” from the top and will be hot-rolled SAE 1045 quality steel.

b. To be made available in 3-foot and 4-foot sections.

c. Hole punching will be 11/16” square and countersunk to receive 5/8” bolts.

d. Location and spacing of the hole will be per AASHTO standards for “HEAVY-DUTY” punching.

a. Face inserts to be Kennametal Grade SP341 formulated using Macrocrystalline type WC manufactured via the menstruum process and yielding a stoichiometric composition.

i. Hardness: 83.5-85.0 HRA

ii. Traverse Rupture Strength: 330,000 psi minimum

iii. Density: 13.25-13.65 g/cc

b. Face insert dimensions will be the following nominal dimensions:

i. Height: 0.745” ± 0.005”

ii. Length: 2” ± 0.005”

iii. Thickness: 0.310” ± 0.005”

c. Center inserts to be a high shock WC grade of tungsten carbide with 11 to 12.5% cobalt content.

i. Hardness: 87.5-89.0 HRA

ii. Density: 14.1-14.6 g/cc

iii. Transverse Rupture Strength: 350,000 psi minimum

d. Center inserts will be 25° trapezoidal dimensions with the following nominal dimensions:

i. Height: 0.635” ± 0.005” (long side)

ii. Thickness: 0.365” ± 0.005”

iii. Length: 1” ± 0.005”

iv. Nose radius: 1/16”

e. The carbide insert manufacturer is to certify the requisitioning agency that the face and center inserts meet all specifications outlined in Line item 7, 2a through 2d.

the entire length of each blade section.

b. The inserts will be brazed on all sides, leaving no voids or shims.

c. The brazing material will be a high-strength alloy, with a minimum shear strength of

30,000 psi minimum.

a. The blade will be beveled at the top to fit the grader moldboard.

b. The difference between the highest and lowest tip points is not to exceed 1/32” on any blade assembly.

c. The finished blade sections will be free of warpage and longitudinal deviation not to exceed 1/8” in a four-foot blade section.

d. Each blade section will be identified with the manufacturer's identification stamp on each end of the section.

e. The finished blade sections will have markings showing the front edge of the blade to avoid improper mounting.

f. The bidder will send with each shipment an analysis of carbide inserts showing Cobalt %, Hardness, Density, Porosity, and Traverse Rupture Strength for the accompanying shipment.

g. Blueprints of the cutting-edge punching are to accompany the bids.

Line 8

1. PLOW BLADE STEEL – RUBBER – CERAMIC – RUBBER – STEEL BLADE FOR UNDERBODY PLOWS

a. This specification covers a flexible snowplow blade system for underbody plows with ceramic inserts free-floating in vulcanized rubber with the configuration of STEEL- RUBBER-CERAMIC-RUBBER-STEEL. The product is designed for optimal operational and wear performance while minimizing vibration and noise. The wear component, in this case, special ceramic pieces or inlays, are designed to “float” within the vulcanized rubber, which helps to minimize the harsh impacts of the wear material with various obstacles encountered on the road surface. This configuration also helps the wear material to push into and better conform to the road surface's shape, thus providing better snow and ice cleaning – hence a “flexible blade system.”

2. FRONT STEEL PLATE

a. Wear-resistant steel with an average hardness of 400HB.

b. Plate thickness of 8mm.

c. Hardness: 400HB (43 Rockwell C, 114 Rockwell B).

d. Tensile Strength: U.T.S. = 1300

e. MPa. Yield Point: Y.P. = 1000 MPa.

f. Tolerances according to the specification of Dillidur 400V.

3. BACK STEEL PLATE

a. Wear-resistant steel with an average hardness of 400HB.

b. Plate thickness of 6mm.

c. Hardness: 400HB (43 Rockwell C, 114 Rockwell B).

d. Tensile Strength: U.T.S. = 1300

e. MPa. Yield Point: Y.P. = 1000 MPa.

f. Tolerances according to the specification of Dillidur 400V.

4. RUBBER

a. The blade shall have a wear-resistant rubber body, vulcanized between two steel plates with ceramic inserts embedded within the rubber.

5. CERAMIC INLAYS

a. The inlay must according to DIN ISO 0335.

b. Hardness of the inlay must be >15000 HV10.

c. Bending strength must be over 300 MPa.

d. The average grain size must be between 2 – 8 µm.

e. Density 3.65 g/cm².

6. FINISHED BLADES

a. Overall blade dimensions: Overall blade height 125mm (tolerance ± 2mm).

b. Overall blade thickness 36mm (tolerance ± 2mm).

c. Overall blade length according to customer and plow requirements.

d. The hole position and design must be according to customer and plow requirements.

AASHTO punch is standard.

7. PHYSICAL REQUIREMENTS

a. All blades shall be straight, free from flaws and injurious defects, and have a workmanlike finish.

b. The mounting area must have protection from over-torquing the mounting hardware.

c. The percentage of ceramic in the rubber must be more than 38% per foot.

d. The percentage of ceramic with contact to the road should not be under 35% per foot.

e. Each blade section should provide the name of the manufacturer and a serial number for quality control.