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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ASTM D e1.
A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Methods are described for estimating ferrite content by chemical, magnetic, and metallographic means. Within the text, the SI units are shown ast brackets. The values stated in each system are not exact equivalents; therefore, each system must be sstm independently of the other.
Combining values from the two systems may result in nonconformance with the practice.
ASTM International – Standard References for ASTM A / AM – 14
It is the responsibility of the user of this satm to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. This may be formed upon solidication from the molten metal delta ferrite or by transformation from austenite or sigma phase on cooling in the solid state alpha ferrite.
BoxN. Current edition approved Mar. Originally published as A — Signicance and Use 4. The ferrite content may sstm limited by purchase order requirements or by the design construction codes governing the equipment in which the castings will be used. The quantity of ferrite in the structure is fundamentally a function of the chemical composition of the alloy and its thermal history. Asgm of segregation, the chemical composition, and, therefore, the ferrite content, may differ from point to point on a casting.
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 specied. Sources of error include the following: Therefore, aztm precision of the ferrite content estimated from chemical composition depends on the accuracy of the chemical analysis procedure.
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. 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.
NOTE 1—There may be a substantial decrease in the ferrite content of weld deposits after solution heat aetm in comparison with the as-deposited value.
Estimation of Ferrite Content 7. 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. The estimates of ferrite content from magnetic measurements S1 a800 from point counts S2or both, if ordered by the purchaser, also shall be reported.
They shall not apply unless specied in the order, in which event the specied methods of ferrite content estimation shall be employed by the manufacturer before shipment of the castings. All measurements shall be made on adtm after the solution heat treatment required by the applicable product specication, or, if any subsequent astj heat treatment is employed, then after the nal solution heat treatment. Measurements may be made either before or after performance of the a8000 test.
If a tension test is not required by the applicable product specication, measurements may be made on a specimen cut from a keel block of a design in Fig. All measurements shall be made on weld deposits as deposited.
ASTM , Ferrite content (CF8M) – Metal and Metallurgy engineering – Eng-Tips
When measurements are made on a curved surface the radius of curvature must be greater than 0. Because of errors in chemical analyses, the calculated ratio may differ from the actual composition ratio and, as a astk, the ferrite content may be higher or lower than indicated by the central X1.
Accordingly, if additional estimates of ferrite content are made by magnetic or metallographic methods, they can be expected to differ from the diagram value. The possible extent of this difference is shown by the broken lines.
Standard Practice for Steel Casting, Austenitic Alloy, Estimating Ferrite Content Thereof
If the composition ratio is 1. Similar information is available in Table X1. 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. 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.
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. 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.
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