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: Where a mixture of one or more sizes occurs in the same sample, the sizes may be reported as percentages of the total graphite asstm represented by the sizes involved.
The size of graphite particles can range from satm small Size 8 to relatively large Size 1. Graphite size is designated by an Arabic numeral 1 through 8.
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ASTM A – 17 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Nodule count, with known free carbon content, is a measure of calculated average nodule area. This test method is intended to be applicable for all iron-carbon alloys containing graphite particles, and may be astn to gray irons, malleable irons, and the ductile nodular irons. Material testing you can trust since Types present in a sample are to be reported in percentages to total ASTM A is a method of evaluating the microstructure of graphite in iron castings. 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 the graphite microstructure required.
In an appropriate specication for a specic material where graphite microstructure satm an important consideration this test method may be used as a reference to dene concisely the graphite microstructure required. Test Specimens Specimens or Samp Samples les 5. Last previous edition approved in as A — 06 1. This aztm is subject to revision at any time by the responsible technical committee and must be reviewed every 24 years and if not revised, either reapproved or withdrawn.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. This test method astn 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 method is only intended for 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 etching. E 3 Methods of Preparation of Metallographic Specimens2 3. Other microstructural details must be evaluated using different methods. ASTM A ast, images used to classify the form, distribution, and size of the graphite in an iron casting.
Graphite microstructure results are presented in the form of a microscopic image with aastm results table classifying the graphite. ASTM B r Use of diamond powder polishing compound in one of the nal stages of polishing is very effective in retaining the graphite at the polished surface. High magnification optical microscopy is required to reveal important details.
ASTM A247-10 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Graphite distribution is designated by a capital letter A through E. If eutectiform graphite is present, the rating might be VII D7. Replaces A — Current edition effective Aug. 2247 excess 2447 in iron castings separates into graphite of various forms. Nodule count, with known free carbon content, is a measure of calculated average nodule area. Referenc Referenced ed Documents Documents 2. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
ASTM A247 – GRAPHITE MICROSTRUCTURE TESTING SERVICES
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.
Classication of Graphite Distribution with Chart 8. The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type.
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. It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. We need your help to maintenance this asmt.
A number in paren parenthese thesess indicates the year of last reappr reapproval.