ASTM A – Designation: A /A M – 01 An American National Standard Standard Practice f. This standard is issued under the constant designation a /a m; the number right away following the designation suggests the yr. according to the guidelines of ASTM E, “Standard Guide for ASTM A, “Standard Practice for Steel Casting, Austenitic Alloy.
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It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the s800 of regulatory limitations prior to use. The gures immediately above and below on the lines U and L indicate the probable upper and lower bounds of the ferrite range that may be expected. Measurements may be made either before or after performance of the tension test. Combining values from the two systems may result in nonconformance with the practice.
The Eng-Tips staff will check this out and take appropriate action. Accordingly, if additional estimates of ferrite content are made by magnetic or metallographic methods, they can be expected to differ from the diagram value. If a tension test is not required by the applicable product specication, measurements may asttm made on a specimen cut from aa800 keel block of a design in Fig.
ASTM , Ferrite content (CF8M) – Metal and Metallurgy engineering – Eng-Tips
Sources of error include the following:. Estimation of Ferrite Content 7. Signicance and Use 4. Because of segregation, the chemical composition, and, therefore, the ferrite content, may differ from point to point on a casting. NOTE 1—There may be a substantial decrease in the ferrite content of weld deposits asstm solution heat treatment in comparison with the as-deposited value. Answer 3 Yes, see answer 2.
ASTM International – Standard References for ASTM A / AM – 14
Close this window and log in. This may be formed asttm solidication from the molten metal delta ferrite or by transformation from austenite or sigma phase on cooling in the solid state alpha ferrite.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The quantity of ferrite in the structure is fundamentally a function of the chemical composition of the alloy and its thermal history. The possible extent of this difference is shown by the broken lines. Also, because the magnets astmm probes of the various measuring instruments satm small, different degrees of surface roughness or surface curvature will vary the magnetic linkage with the material being measured.
Also, because the magnets or probes of the various measuring instruments are small, different degrees of surface roughness or surface curvature will vary the magnetic linkage with the material being measured. BoxN. Sources of error include the following: When measurements are made on a ashm surface the radius of curvature must be greater than 0.
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Determination of the ferrite content by any of the procedures described in the following practice is subject to varying degrees of imprecision which must be recognized in setting realistic limits on the range of ferrite content specified. If a comparison is made of ferrite content estimated from a product analysis performed by the purchaser, with that estimated from the heat analysis see 7. If the composition ratio is 1.
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Download Now White Paper: The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Register now while it’s still free!
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. These may so alter the magnetic response of the alloy that the indicated ferrite content is quite different from that of the same chemical composition that has undergone different thermal treatment.
The ferrite content may be limited by purchase order requirements or by the design construction codes governing the equipment in which the castings will be used.
Standard Practice for Steel Casting, Austenitic Alloy, Estimating Ferrite Content Thereof
Therefore, the precision of the ferrite content estimated from chemical composition depends on the accuracy of the chemical analysis procedure. Defense manufacturing is all about project manufacturing and project accounting. Methods are described for estimating ferrite content by chemical, magnetic, and metallographic means. Link to Active This link will always route to the current Active version of the standard.
The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Promoting, selling, a8800, coursework and thesis posting is forbidden. Similar information is available in Table X1.