GTP Bulletin board about Tungsten grade powders for cemented carbide
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This document provides information about ready-to-press tungsten carbide grade powders manufactured by Global Tungsten & Powders Corp. It discusses the company's history manufacturing tungsten powders since the 1940s. It also describes the customization process for developing grade powders to meet customers' unique specifications and requirements for producing cemented carbide tools and parts. Tables show properties of example custom grade powders and how they relate to properties of the cemented carbides produced from them.
GTP Bulletin board about Tungsten grade powders for cemented carbide
- 1. Ready to Press Grade Powders for Cemented Carbide Technical Information Bulletin Global Tungsten & Powders Corp. 1 Hawes Street Towanda, PA 18848 Phone: (570) 268-5000 Fax: (570) 268-5323 e-mail: [email protected] Introduction Tungsten carbide grade powders are free-flowing formulations, which are ready-to-use as starting materials in the manufacture of cemented carbide tools, wear parts, and other precision components. Each powder granule contains all the constituents of the specified grade, such as tungsten carbide, cobalt, and alloy additions plus a wax binder, which also serves as a die-wall lubricant. The properties of cemented tungsten carbide tools and parts are the direct result of the starting materials and processing conditions. With this in mind, there must be a strong technical link between GTP and the parts fabricator. For nearly 40 years, grade powders have been developed and manufactured at Global Tungsten & Powders. At our production facility in Towanda, Pennsylvania, we start with various ore concentrates and secondary raw materials (scrap) to manufacture APT, Tungsten Powders, Tungsten Carbide, Cobalt and certain alloy powders. This vertical integration offers both cost benefits and security of supply. The ability to use various secondary raw material sources provides an additional opportunity to control costs for our customers. Material Type Photo- micrograph 1500 X Powder Properties Cemented Carbide Properties Hall Flow1 Bulk Density2 Weight Loss Hardness3 Density4 Porosity5 Coercivity6 TRS7 @110°C @450°C Custom Micgrograin Grade 10% Co with Paraffin 23.4 3.4 0.06% 2.2% 92.0 14.40 A02 B00 C00 240 370 Custom C-2 Grade 0.25% TaC / 6% Co With Paraffin 20.2 3.6 0.06% 2.1% 91.9 14.94 A02 B00 C00 206 300 Custom C-5 Steelcutting Grade 7.2% TiC / 10.0% TaC / 8.6% Co with Paraffin 21.1 3.2 0.06% 2.1% 91.3 12.70 A02 B00 C00 123 290 Custom Mining & Drilling Grade 10% Co with Paraffin 22.7 3.4 0.06% 2.2% 87.9 14.51 A02 B02 C00 71 400 Custom Mining Grade 6% Co with Polyethylene Glycol 19.9 3.9 0.02% 3.2% 87.6 14.93 A02 B02 C00 69 300 Notes: Photomicrograph - Photo of pressed and mounted grade powder magnified 1,500 times 1 Hall Flow measures the flowability of the powder and is measured in seconds / 50 grams 2 Bulk Desnsity is measured in grams / cm3 3 Hardness is measured on the Rockwell scale and measures the depth of an indentation of a diamond point into the material. Cemented Carbides use the Rockwell A scale 4 Density is measured in grams / cm3 5 Porosity is measured as follows, A-type refers to pores less than 10 µm in diameter, B-type refers to pores between 10 µm and 40 µm, and C-type is based on excess carbon content (C00 indicates carbon porosity free) 6 Coercivity measures residual magnetism of a cemented carbide sample and is measured in Oersted (Oe) units 7 Transverse Rupture Strength (TRS) determines the mechanical strength of cemented carbide materials and is measured in ksi (kilopounds / square inch). Properties of typical GTP ready-to-press grade powders Custom grades are routinely developed by GTP to meet specific customer requirements Carbon requirements are developed to meet customer specifications
- 2. Ready to Press Grade Powders Technical Information Bulletin Global Tungsten & Powders Corp. 1 Hawes Street Towanda, PA 18848 Phone: (570) 268-5000 Fax: (570) 268-5323 e-mail: [email protected] Partnering With You: Our intention is to be more than simply a supplier, we want to be your partner. The level of customization required to meet your pressing needs is considerable. For this reason, we choose not to list a catalogue of powder products - since it is unlikely an existing powder will meet your exact requirements. We prefer to spend the time understanding your pro- cess and developing a powder solution for your unique requirements. Once a powder has been developed that meets your specifications, our quick lead times can help you manage your inventory. As your process changes to incorporate new and better techniques, GTP will work with you to ensure the powders we engineered together still meet your needs. Global Tungsten & Powders 1 Hawes Street Towanda, PA 18848 USA Phone: +1 (570) 268-5000 Fax: +1 (570) 268-5323 e-mail: [email protected] GTP began manufacturing tungsten powders in the 1940’s. Since then, GTP has expanded it’s refractory metal pow- ders production to include tungsten (including tungsten carbide, thermal spray powders and ready-to-press grade pow- ders), molybdenum, cobalt, and tantalum powder products. GTP produces a wide range of materials, which are used in the manufacture of numerous products. These products include metal working tools for cutting, rolling, and stamping; high temperature jet engine components and protective coatings; circuit manufacturing chemicals for microelectronics; catalysts for petrochemical processing and many others. GTP is headquartered in Towanda, PA with additional manu- facturing sites in Europe (Bruntal, Czech Republic) and India (Bangalore). Headquarters in Towanda, PA Customization Because of the high level of customization required in the manufacture of grade powders, we have chosen not to include a full product brochure in this technical bulletin. Grade powders are some of the most unique powders produced today. When it comes to ready-to-press powders, there is no such thing as “standard.” GTP has developed hundreds of grades over the years and will work closely with you to produce a powder that meets your specific needs. Certification Lot data for the above physical and chemical specifications is reported in a certificate of analysis that is provided with each shipment. Chemical analysis is performed on each lot. Addictional Information is available upon request. Packaging Typically each lot is packaged in a plastic bag inside a plastic pail. Each pail contains 30 kilograms of grade powder per pail. Alternative packaging can be discussed at time of order placement. History of Global Tungsten & Powders: