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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Current Curre nt editio edition n appro approved ved March 1, Graphite size is designated by an Arabic numeral 1 through 8.
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. The percentages of each graphite type are estimated by observation, or better, by counting the particles 2447 each type. Test Specimens or Samples 5. This standard has been approved for use by agencies of the Department of Defense. Graphite size is asmt by an Arabic numeral 1 through 8.
Size px x x x x Occasionally, however, graphite in malleable or ductile iron may occur in a nonrandom distribution sstm which the distributions B to E may be used to describe. Please help us to share our service with your friends. Usually visual comparison with the chart is adequate to sstm the size class. The percentages of each graphite type are estimated by observation, or better, by counting the particles of each type. Users asm this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
The size of graphite particles can range from very small Size 8 to relatively large Size 1. ASTM A is a method of evaluating the microstructure of graphite in iron castings. Our laboratory also provides laboratory services for plastic testingmetal testingrubber testingoil testingpaint testingplating testingadhesive testingcircuit board testingand other testing.
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. No further reproductions authorized. Any convenient magnication that clearly reveals the graphite form may be used. At exactly diameters magnication the maximum dimension of the graphite particles for the various size classes are shown in Table 1.
However, the microstructure is typically evaluated by the percentage of Types I and II that are commonly observed. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Good microstructural results require significant preparation to obtain a mirror finish with no scratches or edge rounding prior to etching. Graphite microstructure is useful in predicting the strength and impact resistance of an iron casting at specific locations. It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. 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.
Please copy and paste this embed script to where you want to embed Embed Script. Report of Graphite Microstructure Signicance and Use 4. 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. ASTM A provides images used to classify the form, distribution, and size of the graphite in an iron casting. Permission rights to photocopy the standard may 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. Advanced Plastic and Material Testing, Inc. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. A number in paren parenthese thesess indicates the year of last reappr reapproval.
Sample identication; graphite form type or types; graphite distribution; graphite size class. Sco Scope pe 1. Graphite distribution is designated by a capital letter A through E.
No other units of measurement are included in this standard.
Graphite distribution is designated by a capital letter A through E. 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 ast. Classication of Graphite Size by Chart 9. Work Item s – proposed revisions of 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.
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