ASTM A751 PDF

ASTM A ASTM Da. ASTM Aa. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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ASTM Da. ASTM A ASTM Aa. Designation: A — 07a Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products1 This standard is issued under the xed designation A ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

This standard has been approved for use by agencies of the Department of Defense. Such subjects as denitions of terms and product check analysis variations tolerances required clarication. Requirements for sampling, meeting specied limits, and treatment of data usually were not clearly established in product specications.

It is intended that these test methods, practices, and terminology will contain all requirements for the determination of chemical composition of steel, stainless steel, or related alloys so that product specications will need contain only special modications and exceptions.

It includes both wet chemical and instrumental techniques. 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.

Referenced Documents 2. Current edition approved June 1, Published June Originally approved in Last previous edition approved in as A — Terminology 3. The range of the specied composition applicable to product analysis is normally greater than that applicable to heat analysis in order to take into account deviations associated with analytical reproducibility Note 1 and the heterogeneity of the steel.

NOTE 1—All of the chemical analysis procedures referenced in this document include precision statements with reproducibility data with the exception of Test Methods E It does not apply to cast or heat analyses determined to show conformance to specied chemical limits. It applies only to product analysis and becomes meaningful only when the heat analysis of an element falls close to one of the specied limits.

For example, stainless steel UNS limits for chromium are A heat that the producer reported as If the product analysis tolerance for such a chromium level is 0. A product analysis of The selection of a laboratory to perform the referee analysis shall be a matter of agreement between the supplier and the purchaser.

Concerning the Specication of Chemical Composition Requirements 4. Over 0. Over 3. XXXX or may be expressed as ppm 0. XXX 0. The heat analysis shall be obtained from one remelted ingot, or the product of one remelted ingot, from each primary melt.

If this heat analysis does not meet the heat analysis requirements of the specication, one sample from the product of each remelted ingot shall be analyzed, and the analyses shall meet the heat analysis requirements.

Product Analysis Requirements 6. If several determinations of any element in the heat are made, they may not vary both above and below the specied range. Unspecied Elements Note 4 7. NOTE 4—All commercial metals contain small amounts of various elements in addition to those which are specied.

It is neither practical nor necessary to specify limits for every unspecied element that might be present, despite the fact that the presence of many of these elements is often routinely determined by the producer. NOTE 3—The recommendations should be employed to reduce the number of signicant gures, such as from Sampling 8. The analysis shall meet the specied limits for heat analysis. Test Methods 9. Cast or Heat Analysis 5. The results of such analyses shall conform to the requirements specied in the material specication.

If signicant variations in heat or cast size are involved, a weighted average heat or cast analysis, based on the relative quantity of metal in each heat or cast, shall be reported.

See Table 2 for normal elements and ranges for stainless steels. Proprietary methods are permissible provided the results are equivalent to those obtained from standard methods when applicable.

See Table 1 for normal elements and ranges for stainless steels. Reference Materials NIST does not produce reference standards suitable for all elements or all alloys. DS2, issued Several independent laboratories should be used for certication of these standards and their results statistically reviewed and merged.

Examples of denitive analytical methods include gravimetric, coulometry, titrimetric based on normality, and mass spectrometry. Signicant Numbers Rounding Procedure Records Keywords Approved June 1, Committee A01 has identied the location of selected changes to this standard since the last issue A — 01 that may impact the use of this standard. Approved April 1, ASTM International 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. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm.

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