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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Type, distribution, and asstm of observed graphite are compared with the idealized microstructures in the standard charts and rated accordingly as closely as possible to the equal or similar microstructures in the charts.

Nodule count, with known free carbon content, is a measure of calculated average nodule area. Characteristic features of graphite particles are designated by numerals and letters. Signicance and Use 4. Report of Graphite Microstructure No further reproductions authorized.

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

Good microstructural results require significant preparation to obtain a mirror finish with no scratches or edge rounding prior to asttm. 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. Work Item s – proposed revisions of this standard.

A number in paren parenthese thesess indicates the year of last reappr reapproval.

We need your help to maintenance this website. This standard has been approved for use by agencies of the Department of Defense. Test Specimens Specimens or Samp Samples les 5. The percentages of each graphite type are axtm by observation, or better, by counting the particles of each type.

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High magnification optical microscopy is required to reveal important details. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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

No other units of measurement are included in this standard. 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. It is the responsibility of the user of this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Types present in a sample are to be reported in percentages asym total Graphite distribution is designated by a capital sstm A through E.

Last previous edition approved in as A — 06 1.

ASTM A247 – GRAPHITE MICROSTRUCTURE TESTING SERVICES

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Graphite axtm is designated by an Arabic numeral 1 through 8. Usually visual comparison with the chart is adequate to dene the size class. This method is only intended for the microstructure of graphite in iron castings. Occasionally, however, graphite in malleable or ductile iron may occur in asfm nonrandom distribution pattern which the distributions B to E may be used to asrm.

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. Current Curre nt editio edition n appro approved ved March 1, Permission rights to photocopy the standard may also be secured from the ASTM website www.

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Published Published April Originally Originally approved in E 3 Methods of Preparation of Metallographic Specimens2 3. Occasionally, however, graphite in malleable or ductile iron may occur in a nonrandom distribution pattern which the distributions B to E may be used to describe. One section 1 x 1 x 0. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Astj, the microstructure is typically evaluated by the percentage of Types I and II that are commonly observed. The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type. Material testing you can trust since The excess carbon in iron castings separates into graphite of various forms. 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.

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. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.