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26 MoldMaking Technology July 2015 Mold Materials Mold Materials www.ntm.com • cs@ntm.com Submit your quote request today and learn how we can help you turn steel into enhanced productivity. TURNING STEEL INTO ENHANC ED PRODUCTIVITY Custom Mold & Diecast Bases • Value-Added Machining • In-House Holder Steel Options from minimum steel processing to complete machining and assembly. Your Single Source For Mold-Quality Alloy Steel is Free-Machining Marshalloy MQ/FM pre-hardened alloy steel from Diehl Steel is a mold-quality, free-machining, premium P-20 steel produced through a propriety melting and refining process. It is suitable for plastic injection mold applications, as well as short-run tools and dies, offering high cleanliness, polishability, machinability, uniformity and hardenability, the company says. According to Diehl, the steel can be polished to a high finish, and it is rigor- ously tested to ensure uniformity of structure and low inclusion levels. It is decarb-free and stress-relieved, making it well-suited for EDM processes, as well. Pre-hardened to 262/321 BHN, Marshalloy MQ/FM's balanced composition ensures uniform cross-sectional hardness and maintains the specified hardness through- out the plate, the company says. Minimum variation within any plate is 30 BHN. Diehl Steel Co. / 513-242-8900 / diehlsteel.com Aluminum Mold Plate Resists High Temperatures With strength similar to that of medium- to high-strength aluminum alloys, Weldural aluminum mold plate from Clinton Aluminum is engineered to offer high temperature resistance and excellent welding characteristics. According to the company, this material is comparable to 7000-series aluminum alloys in machinability, wear resistance and polishability. Weldural also maintains its relatively high strength at temperatures ranging to 250°C (482°F), unlike some 7000-series mold alloys that are not recommended to operate higher than 110°C (230°F). Weldural's weldability can be compared to that of alloy 5083, the company says. In addition, the aluminum mold plate maintains a relatively high strength with no significant dependence on plate thickness. This characteristic, along with its low internal stress level, ensures excellent machinability and high dimensional stability, Clinton Aluminum says. Clinton Aluminum / 330-882-6743 / clintonaluminum.com New Mold Steel Grades Introduced Mold steels ThruHard Supreme, developed by Buderus Edelstahl, and Mirrax 40, developed by Uddeholms AB are available from Bohler- Uddeholm Corp. ThruHard Supreme is designed to offer increased wear resistance, higher thermal conductivity for reduced cycle times, greater textur- ing reliability and polishability, improved weldability, and enhanced machining characteristics over conventional P20 steel. Because of its consistent surface-to-core hardness, it can be supplied at higher hardness levels of 310–355 HB than a typical P20. Mirrax 40 is a remelted (ESR) prehardened stainless steel supplied at a hardness of 40 HRC said to offer mold users lower maintenance and production costs. The grade will maintain its finish on molds that are stored or used in humid environments without requiring special protection, the company says. It also resists corrosion, allowing con- sistent thermal conductivity for the entire life of the mold. Bohler-Uddeholm Corp. / 630-883-3100 / bucorp.com