ASTM A247-24 pdf download,Standard Test Method for Visual Evaluation of Graphite in Iron Castings. 1.1 This test method ASTM A247 is designed to categorize graphite in cast irons based on type, distribution, and size through visual comparison to reference photomicrographs. It is intended for use with all iron-carbon alloys containing graphite particles and can be applied to gray irons, malleable irons, compacted graphite irons, and ductile (nodular) irons. 1.2 The reference photomicrographs included in this test method should not be interpreted as specifications. They are provided solely for the purpose of defining the graphite microstructure required in a specific material’s...