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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Report of Graphite Microstructure Signicance and Use 4.

E 3 Methods of Preparation of Metallographic Specimens2 3. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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. A number in parentheses indicates the year of last reapproval. Material testing you can trust since A number in paren parenthese thesess indicates the sstm of last reappr reapproval. Characteristic features of graphite particles are designated by numerals and letters.

ASTM A provides images used to classify the form, distribution, and size of the graphite in an iron casting. Test Specimens Specimens or Samp Samples les 5. High magnification optical microscopy is required to reveal important details. Graphite microstructure is useful in predicting the strength and impact resistance of an iron casting at specific locations.

However, the microstructure is typically evaluated by the percentage of Types I and II that are commonly observed. We need your help! Current Curre nt editio edition n appro approved ved March 1, Sample identication; graphite form type or types; graphite distribution; graphite size class. 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.

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In an appropriate specication for a specic material where graphite microstructure is an important consideration this test method may be used as a reference to dene concisely the graphite microstructure required. 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. Graphite distribution is designated by a capital letter A through E. The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type.

Jesus Talledo Bermudez Category: ASTM A is a method of evaluating the microstructure of graphite in iron castings. It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type. Types present in a sample are to be reported in percentages to total It is the responsibility of asmt user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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

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.

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

Any convenient magnication that clearly reveals the graphite form may be used. 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.

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

Report of Graphite Microstructure Graphite microstructure results are presented in the form of a microscopic image with a results table classifying the graphite. Graphite size is designated by an Arabic numeral 1 through 8.

Please help us to share our service with your friends. 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. Graphite distribution is designated by a capital letter A through E. Please copy and zstm this embed script to where you want to embed Embed Script.

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Graphite size is designated by an Arabic numeral 1 through 8.