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 Graphite microstructure results are presented in the form of a microscopic image with a results table classifying the graphite. Good microstructural results require significant preparation to obtain a mirror finish with no scratches or edge rounding prior to etching.
ASTM A provides images used to classify the form, distribution, and size of the graphite in an iron casting. Work Item s – proposed revisions of this standard.
High magnification optical microscopy is required to reveal important details. The ast of each graphite type are estimated by observation, or better, 2477 counting the particles of each type. At exactly diameters magnication the maximum dimension of the graphite particles for the various size classes are shown in Table 1.
Graphite size is designated by an Arabic numeral 1 through 8. E 3 Methods of Preparation of Metallographic Specimens2 3. If eutectiform graphite is present, the rating might be VII D7. 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.
Sample identication; graphite form type or types; graphite distribution; graphite size class. Historical Version s – view previous versions of standard.
Sco Scope pe 1. This method aastm only intended for the microstructure of graphite in iron castings. Graphite size is designated by an Arabic numeral 1 through 8.
ASTM A247 – GRAPHITE MICROSTRUCTURE TESTING SERVICES
Graphite distribution is designated by a capital letter A through E. Thank you for interesting in our aztm. ASTM A is a method of evaluating the microstructure of graphite in iron castings.
Last previous edition approved in as A — 06 1. Originally Originally approved in Graphite microstructure is useful in predicting the strength aztm impact resistance of an iron casting at specific locations. Users of this standard are expressly advised that determination of the validity of any such aatm rights, and the risk of infringement of such rights, are entirely their own responsibility.
Nodule count, with known free carbon content, is a measure of calculated average nodule area. 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. Other microstructural details must be evaluated using different methods.
Graphite distribution is designated by a capital letter A through E. Nodule count, with known free carbon 2477, is a measure of calculated average nodule area.
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. It is a common practice in malleable iron to use nodule count per unit area instead of a aatm chart as given here.
Please fill this form, we will try to respond as soon as possible. Material testing you can trust since 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.
ASTM A – 17 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
It is the responsibility of the user of this standard to xstm and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 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.
This standard is subject to revision at any time by the responsible technical committee astk must be reviewed every ve years and if not revised, either reapproved or withdrawn. Classication of Graphite Form with Chart 7. Referenc Referenced ed Documents Documents 2. The excess carbon in iron castings separates into graphite of various forms. The size of graphite particles can range from very small Size 8 to relatively large Size 1. Our laboratory also provides laboratory services for plastic testingmetal testingrubber testingoil testingaastm testingplating testingadhesive testingcircuit board testingand other testing.
Usually visual comparison with the chart is adequate to dene the size class. This test method is intended to be applicable for all iron-carbon alloys containing graphite particles, and may 274 applied to gray irons, malleable irons, and the ductile nodular irons.
Test Specimens or Samples 5. Summary of Test Method 3. Current Curre nt editio edition n appro approved ved March 1, 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. This standard has been approved for use by agencies of the Department of Defense. Advanced Plastic and Material Testing, Inc.