Extramet Grades

Our proprietary grades are produced on an application specific basis. All materials are traceable to the production lots and manufactured in accordance with international health, safety, and quality standards.

While there are many different grades of Tungsten Carbide available containing various additives for a variety of applications, on the most basic level the primary properties of any given grade (Hardness and Toughness) are determined by the ratio of Tungsten Carbide to Cobalt. In general, a lower percentage of Cobalt will produce a harder, more brittle material while a higher percentage will produce a tougher, less wear resistant material.

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Submicron Grain

EMT 100

6% co

EMT 100 offers high wear resistance for the machining of non-ferrous metals, plastic and fiber reinforced materials. Other applications include diamond coating, reaming, oil field wear parts, nozzles, compacting tooling and for rolling and punching thin metallic materials.

EMT 210

10% co

EMT 210 is used in general purpose rotary carbide tooling. High Transverse Rupture Strength (TRS) for the machining of non-ferrous metals, nickel-alloyed steels, as well as hardened, alloyed, cast and stainless steel.

Fine Grain

EMT 409

9% co

EMT 409 combines edge strength with wear and temperature resistance. Ideal for roughing, and heavy drilling. Uses include metal punching and forming.

EMT 412

12% co

EMT 412 is noted for high Traverse Rupture Strength (TRS) for impact resistance and heightened edge strength, both of which make an excellent choice for applications such as interrupted cut milling and punching.

Ultra-Fine Grain

EMT 609

9% co

EMT 609 ultrafine grade used for milling hardened steel (>50HRV). It is ideal for High Speed Cutting (HSC) for mold construction, wear resistant micro-tools, finish spot milling/secondary chatter reduction and uncoated machining for new composite materials. Exceptional resistance to wear. WEDM is to be avoided.

EMT 612

12% co

EMT 612 ultrafine grade with improved impact strength and Traverse Rupture Strength (TRS) for machining hard materials up to 64HRC, titanium alloys and high alloyed steels. WEDM is to be avoided.

Selecting Grades

There are over a dozen different grades of Tungsten Carbide. When evaluating equivalents of Tungsten Carbide grades the important criteria is to specify two of three factors; binder content, hardness or grain size. Balance must be made between wear resistance and impact resistance.

Extramet Grade Select Chart

What is Tungsten Carbide?

Tungsten carbide is a homogenous mixture of tungsten carbide grains in a tough cobalt binder matrix. The carbide grains are fused into a solid matrix of cobalt metals. The metal carbide's grains are "cemented" in the binder metal's matrix. The fusion process is called liquid phase sintering, or sinter for short.

Extramet Effect of Grain Size Chart