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WC granularity requirements
- Jul 04, 2018 -

Different alloys of carbide use different sizes of WC (tungsten carbide). Carbide cutting tools: such as cutting machine blades, V-CUT knives and other finishing alloys using ultra-fine, sub-fine, fine-grained WC, rough-working alloys using medium-grain WC, gravity cutting and heavy-duty cutting alloys using medium and thick Particle WC is used as raw material; mining tool: high rock hardness, large impact load, coarse particle WC, small rock impact and small impact load. Medium particle WC is used as raw material; wear-resistant parts: when emphasizing its wear resistance, compression resistance and surface finish When using ultra-fine, sub-fine, fine, medium-grain WC as raw materials, the impact-resistant tools are mainly medium and coarse-grain WC raw materials.

    The WC theoretical carbon content is 6.128% (atomic 50%). When the WC carbon content is greater than the theoretical carbon content, free carbon (WC+C) appears in the WC. The presence of free carbon causes the surrounding WC grains to grow during sintering, resulting in uneven carbide grains. Tungsten carbide generally requires high carbon (≥6.07%), free carbon (≤0.05%), and total carbon is determined by the production process and scope of use of cemented carbide.

        At present, the total carbon content of WC in China is roughly divided into three types: the total carbon of WC for vacuum sintering of paraffin process is about 6.18±0.03% (free carbon will increase). The total carbon content of WC for hydrogen sintering in the paraffin process is 6.13 ± 0.03%. The total carbon of WC for rubber process hydrogen sintering is 5.90±0.03%. The above processes are sometimes crossed, so it is determined that the total carbon of the WC is as the case may be.

    The WC total carbon used in alloys with different ranges of use, different Co (cobalt) content and different grain sizes can be adjusted slightly. For low-cobalt alloys, tungsten carbide with a high total carbon can be used, and for high-cobalt alloys, tungsten carbide with a low total carbon can be used. In short, the specific use requirements of cemented carbides have different requirements on the particle size of tungsten carbide. When you have special particle size requirement for the tungsten carbide paper cutting knife, please tell us when you send drawing. Thanks a lot!