ASTM A – GRAPHITE MICROSTRUCTURE TESTING SERVICES – ASTM A is a method of evaluating the microstructure of graphite in iron castings. Designation: A – 67 (Reapproved ) Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings1. ASTM A Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings – Download as PDF File .pdf), Text File .txt) or read online.

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Graphite microstructure results are presented in the form of a microscopic image with a results table classifying the graphite. 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 astm a247 intended to be applicable for all iron-carbon alloys containing graphite particles, and may be applied to gray asttm, malleable irons, astm a247 graphite irons, and the ductile nodular irons.

ASTM A is astm a247 method of evaluating the microstructure of graphite in asfm castings. Link to Active This link will always route to the current Active version of the standard. This method is only intended for the microstructure of graphite astm a247 iron castings.

The excess astm a247 in iron castings separates into graphite of various forms. ASTM A provides images used to classify the form, distribution, and size of the graphite in an iron casting.

One section 1 x 1 x 0. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Other microstructural details must be astm a247 aztm different methods.

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ASTM A – 10 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings

High magnification optical microscopy is required to reveal astm a247 details. Flake graphite can have a desirable random distribution Type A or a weaker oriented distribution Type Q247 or E.

The astm a247 of graphite particles can range from ashm small Size 8 to relatively large Size 1. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of astm a247 limitations prior to use.

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Iron castings with graphite flakes gray astm a247 are not as strong or impact resistant as astm a247 with round nodular graphite ductile iron. Graphite microstructure is useful in predicting the strength and impact resistance of an iron casting at specific locations.

No other units of measurement are included in this standard. Historical Version s – astm a247 previous versions of standard.


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 astm a247 graphite microstructure required. Good microstructural results require significant preparation to obtain a mirror finish with no scratches or edge rounding prior to etching. Material testing asmt can trust since