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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ASTM A247-10 Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
Graphite microstructure results are presented in the form of a microscopic image with a results table classifying the graphite. Some malleable irons may contain Types I or II graphite particles also.
Nodule count, with known free carbon content, is a measure of calculated average nodule area. 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
This standard has been approved for use by agencies of the Department of Defense. Sample identication; graphite form type or types; graphite distribution; graphite size class. Some malleable irons may contain Types I or II graphite particles also. Thank you for interesting in astmm services. Characteristic features of graphite particles are designated by numerals and letters.
Classication of Graphite Size by Chart 9. 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.
ASTM A247 – GRAPHITE MICROSTRUCTURE TESTING SERVICES
Permission rights to photocopy the standard may also be secured from the ASTM website www. Flake graphite can have a desirable random distribution Type A or a weaker oriented distribution Type D or E. Work Item s – proposed revisions of this standard. Published Published April 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.
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. 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.
One section 1 x 1 x 0. Our laboratory also provides laboratory services for plastic testingmetal testingrubber testingoil testingpaint testingplating testingadhesive testingcircuit board testingand other testing. 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.
Graphite distribution is designated by a capital letter A through E. ASTM A is a method of evaluating the microstructure of graphite in iron castings. It asgm a common 2447 in malleable iron to use nodule count per unit area instead of a comparison chart as ast here.
Test Specimens Specimens or Samp Samples les 5.
The excess carbon in iron castings separates into graphite of various forms. It is the responsibility of the user of this sstm to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
We are a non-profit group that run this website to share documents. Graphite distribution is designated by a capital letter A through E.
Historical Version s – view previous versions of standard. Classication of Graphite Form with Chart 7. Advanced Plastic and Material Testing, Inc. Sco Scope pe 1.
Current edition effective Aug. Iron castings with graphite flakes gray iron are qstm as strong or impact resistant as those with round nodular graphite ductile iron.
Type, distribution, and size of observed graphite are compared with the idealiz ide alized ed micr microst ostruc ructur tures es in the stan standar dard d cha charts rts and rat rated ed acco ac cord rdin ingl gly y as cl clos osel ely y as po poss ssib ible le to th thee eq equa uall or si simil milar ar microstructures in the charts. Types present in a sample are to be reported in percentages to total Users of 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.