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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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by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.

Classication of Graphite Size by Chart 9. Some malleable irons may contain Types I or II graphite particles also. At exactly diameters magnication the maximum dimension of the graphite particles for the various size classes are shown in Table 1. Originally Originally approved in Graphite distribution is designated by a capital letter A through E.

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

qstm If eutectiform graphite is present, the rating might astj VII D7. Permission rights to photocopy the standard asym also be secured from the ASTM website www. Graphite microstructure results are presented in the form of a microscopic image with a results table classifying the graphite.

The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type. Summ Summary ary of Test Test Method 3. Published Published April It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. 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.

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

427 Report of Graphite Microstructure We need your help to maintenance this website. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.

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Iron castings with graphite flakes gray iron are not as strong or impact resistant as those with round nodular graphite ductile iron. No other units of measurement are included in this standard.

Test Specimens or Samples 5. If eutectiform graphite is present, the rating might be VII D7.

Characteristic features of graphite particles are designated by numerals and letters. Referenc Referenced ed Documents Documents 2. High magnification optical microscopy is required to reveal important details. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the asm. Material testing you can trust since Other microstructural details must be evaluated using different methods.

In an appropriate specication for a specic qstm where graphite microstructure is an important consideration this test method may be used as satm reference to dene concisely the graphite microstructure required.

Sample identication; graphite form type or types; graphite distribution; graphite size class. 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.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations astk to use. 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: Some malleable irons may contain Types I astk II graphite particles also. 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.

Any convenient magnication that clearly reveals the graphite form may ast, used. Type, distribution, and size 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. It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here.

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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. Replaces A — Graphite microstructure is useful in predicting the strength and impact resistance of an iron casting at specific locations.

Usually visual ashm with the chart is adequate to dene the size class. No further reproductions authorized. 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. 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.

Our laboratory also provides laboratory services for plastic testingmetal testingrubber testingoil testingpaint testingplating testingadhesive testingcircuit board testingand other testing. Thank you for interesting in our services. 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. This method is only intended for the microstructure of graphite in iron castings. Characteristic features of graphite particles are designated by numerals and letters.

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.