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Diehl Steel has introduced Marshalloy MQ/FM prehardened alloy steel. The mold quality, free machining steel is a premium P-20 produced through a propriety melting and refining process and is suitable for plastic injection mold applications as well as short run tools and dies. It shows superior cleanliness, polishability, machinability, uniformity and hardenability.
The unique characteristics of Marshalloy MQ/FM allow it to be polished to an extremely high finish, according to the company. The material is tested to rigorous standards to ensure uniformity of structure and exceptionally low inclusion levels. It is decarb-free and stress-relieved, making it ideal for EDM processes.
Prehardened to 262/321/BHN, the balanced composition ensures uniform cross-sectional hardness and maintains the specified hardness throughout the plate. Minimum variation within any plate is 30BHN.
Related Glossary Terms
- electrical-discharge machining ( EDM)
electrical-discharge machining ( EDM)
Process that vaporizes conductive materials by controlled application of pulsed electrical current that flows between a workpiece and electrode (tool) in a dielectric fluid. Permits machining shapes to tight accuracies without the internal stresses conventional machining often generates. Useful in diemaking.
- hardenability
hardenability
Relative ability of a ferrous alloy to form martensite when quenched from a temperature above the upper critical temperature. Hardenability is commonly measured as the distance below a quenched surface at which the metal exhibits a specific hardness (50 HRC, for example) or a specific percentage of martensite in the microstructure.
- hardness
hardness
Hardness is a measure of the resistance of a material to surface indentation or abrasion. There is no absolute scale for hardness. In order to express hardness quantitatively, each type of test has its own scale, which defines hardness. Indentation hardness obtained through static methods is measured by Brinell, Rockwell, Vickers and Knoop tests. Hardness without indentation is measured by a dynamic method, known as the Scleroscope test.
- machinability
machinability
The relative ease of machining metals and alloys.
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