Evaluating the Microstructure of Graphite in Iron Castings1 This standard is issued under the xed designation A ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. This test method is intended to be applicable for all iron-carbon alloys containing graphite particles, and may be applied to gray irons, malleable irons, and the ductile nodular irons.
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Dura-Bar continuous cast gray irons contain flake graphite in matrix structures that range from all pearlite to pearlite plus ferrite depending on the grades. The matrix structure will influence machinability, strength, hardness and wear characteristics.
In general, a fully pearlitic matrix will have the best mechanical properties and will be readily machinable. Bars containing ferrite in the matrix will be easier to machine but will be lower in strength and wear resistance. The graphite structure influences strength, surface finish and hardness. Dura-Bar G2 gray iron will contain this type of graphite distribution and will be best suited for applications requiring moderate strength, good vibration damping and thermal conductivity, along with optimal machining characteristics.
Dura-Bar G2P and G2S will have the same graphite distribution with a highly pearlitic core matrix and mostly pearlitic rim matrix aiding surface hardenability.
Dura-Bar G2S is alloyed with molybdenum to obtain higher tensile strengths throughout the continuous cast product and maintain strength in elevated temperature applications.
Irons containing finer flake sizes are available in the G1A and G2A grades. Irons containing Type D graphite are most often specified for glass and other permanent mold applications, when excellent surface finishes are required.
The behavior of gray iron is non-ductile. What is your competition doing to save time and money? How does the quality of the material you use stack up? Are lead times ever a concern? Explore tech briefs, brochures and certificates. Filter by topic and download documents to learn more about Dura-Bar products and advantages.
Gray Iron Overview Dura-Bar continuous cast gray irons contain flake graphite in matrix structures that range from all pearlite to pearlite plus ferrite depending on the grades. Why Dura-Bar? Resources Explore tech briefs, brochures and certificates. Where To Buy.
ASTM A247 - GRAPHITE MICROSTRUCTURE TESTING SERVICES
Historical Version s - view previous versions of standard. More A It does not indicate, except in a very broad way, the origin of the graphite or the suitability of the iron-carbon alloy for a particular service. This test method is intended to be applicable for all iron-carbon alloys containing graphite particles, and may be applied to gray irons, malleable irons, compacted graphite irons, and the ductile nodular irons. In an appropriate specification for a specific material where graphite microstructure is an important consideration, this test method may be used as a reference to concisely define the graphite microstructure required.