A247-19 Standard Test Method for Evaluating the Microstructure of Graphite in lron Castings

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标准简介

Designation: A247 -19 Standard Test Method for Evaluating the Microstructure of Graphite in lron Castings11. Scope1.1 This test method covers the classification of graphite incast irons in tenms of type，distribution. and size by visualcomparison to reference photomicrographs. This test mcthod isintended to be applicable for all iron-carbon alloys containinggraphite particles.and may be applied to gray irons. malleableirons.compacted graphite irons.and the ductile (nodular)irons.1.2 The reference photomicrographs included in this testmethod are in no way to be construed as specifications. In anappropriate specification for a specific material where graphitemicrostructure is an important considcration, this test methodmay be used as a reference to concisely define the graphitemicrostructure required.1.3 These reference photomicrographs are offered primarilyto permit accurate reporting of microstructures of cast ironsand to facilitate the comparison of reports by different labora-tories or investigators.1.4 The values stated in Sl units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.5 This standard does nor purport to address all of thesafe

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