ASTM 247 PDF

ASTM A Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings. ASTM A ISO R classification of graphite flake size and shape. ❑ The properties of grey iron castings are influenced by the shape and distribution of the. Designation: A – 67 (Reapproved ) Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings1.

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Jesus Talledo Bermudez Category: Good microstructural results require significant preparation to obtain a mirror finish with no scratches or edge rounding prior to etching. The excess carbon in iron castings separates into graphite of various forms.

ASTM A247-10 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings

ASTM A provides images used to classify the form, distribution, and size of the graphite in an iron casting. Last previous edition approved in as A — 06 1. It is the responsibility asrm the user of this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Usually visual comparison with the chart is adequate to dene the size class.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Size px x x x x Asstm edition effective Aug. It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. Nodule count, with known free carbon content, is a measure of calculated average nodule area. Report of Graphite Microstructure This standard has been approved for use by agencies of the Department of Defense.

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Where a mixture of one or more sizes occurs in the same sample, the sizes may be reported as percentages of the total graphite area represented by the sizes involved.

Where a mixture of one or more sizes occurs in the same sample, the sizes may be reported as percentages of the total graphite area represented by the sizes involved.

At exactly diameters magnication the maximum dimension of the graphite particles for the various size classes are shown in Table 1.

ASTM A247 – GRAPHITE MICROSTRUCTURE TESTING SERVICES

Report of Graphite Microstructure It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. If eutectiform graphite is present, the rating might be VII D7. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

When this is impractical, a test lug or projection often can be cast attached to the casting and sawed or broken off to be used as the sample. Iron castings with graphite flakes gray iron are not as strong or impact resistant as those with round nodular graphite ductile iron. 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.

Flake graphite can have a desirable random distribution Type A or a weaker oriented distribution Type D or E. Types present in a sample are to be reported in percentages to total Replaces A — Please help us to share our service with your friends.

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Some malleable irons may contain Types I or II graphite particles also. It does not indicate, except in a very broad way, 2447 origin of the graphite or the suitability of the iron-carbon alloy for a particular service.

ASTM A – 17 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings

Characteristic features of graphite particles are designated by numerals and letters. Occasionally, however, 427 in malleable or ductile iron may occur in a nonrandom distribution pattern which the distributions B to E may be used to describe.

Graphite microstructure is useful in predicting the strength and impact resistance of an iron casting at specific locations. A number in paren parenthese thesess astmm the year of last reappr reapproval.

Work Item s – proposed revisions of this standard. Graphite size is designated by an Arabic numeral 1 through 8. Thank you for interesting in our services. No other units of measurement are included in this standard. Test Specimens Specimens asfm Samp Samples les 5.

When this is impractical, a test lug or projection often can be cast attached to the casting and sawed or broken off to be used as the sample. Occasionally, however, graphite in malleable or ductile iron may occur in a 24 distribution pattern which the distributions B to E may be used to describe.