What 6% Cobalt Means in a Tungsten Carbide Grade
A 6% cobalt designation describes the binder content of a cemented-carbide grade. It does not mean the material contains only 6% tungsten carbide.
EMT 100 is a submicron tungsten carbide grade with 6% cobalt binder. The manufacturer’s data sheet, valid from February 3, 2026, lists 93% tungsten carbide, 6% cobalt and 1% other carbides, with density 14.80 ± 0.10 g/cm³. Confirm the applicable material specification, quantity and delivery with your quote.
Compare the Complete Grade Specification
Binder percentage alone does not identify an interchangeable material. Compare the named grade and its documented properties with the part and operating conditions.
- Composition: Include tungsten carbide, binder and other constituents. A simple 94%/6% description does not represent the cited EMT 100 sheet.
- Material properties: Review the grain size, hardness, strength and density stated in the applicable data sheet.
- Part requirements: State the starting and finished dimensions, stock allowance, tolerance, finish and inspection requirements.
- Service conditions: Describe abrasion, impact, load, temperature, lubrication and chemical exposure before selecting a grade.
Application Review for a 6% Cobalt-Binder Grade
The percentage is a starting point for review, not a promise of service life or suitability for every application.
- Wear and impact: Compare the actual wear mechanism, supported geometry and failure history. Do not infer impact suitability from binder percentage alone.
- Load and strength: Use the complete grade specification and drawing when reviewing the forces on the component.
- Temperature: State the operating temperature and thermal cycling. A constituent’s melting point is not an allowable service-temperature rating.
- Corrosion: Review binder compatibility with the chemical, concentration and temperature. A 6% cobalt grade should not be assumed suitable for all corrosive environments. Compare the tungsten carbide grade data.
Working With Extramet Products
Send the grade designation or material specification, drawing, quantity and application details for review. Include these requirements with the request:
- Material basis: The named grade, data-sheet revision and whether substitutions are permitted.
- Custom requirements: Finished dimensions, stock allowance, tolerance and surface finish.
- Delivery: Required quantity and due date so availability and lead time can be confirmed.
- Documentation: Required material certificates, inspection results and traceability.
Contact Us
Contact Extramet to discuss the specification, or send an RFQ with the drawing. The EMT 100 reference above does not replace the material specification agreed for an order.
