This interatinal standard was devcloped in accordance with internatonlly recognted priciples on standardiation established in the Decsion on Principles for the Development of International Standards,Guides and Recommendations isued by the Word Trade Organiation Technical Bariers to Trade (TBT)Comite. Designation:A751-21 INTERNAT Standard Test Methods and Practices for Chemical Analysis of Steel Products1 This standard is issued under the fixed designation A751;the number immediately following the designation indicates the year of superscript epsilon(e)indicates an editorial change since the last revision or reapproval. This standand has been approvedfor use by agencies of the U.S.Deparment ofDefense. INTRODUCTION These test methods and practices were prepared toanswer the need for a single document that would include all aspects of obtaining and reporting the chemical analysis of steel,stainless steel,and related alloys.Such subjects as definitions of terms and product (check)analysis variations (tolerances) required clarification.Requirements for sampling,meeting specified limits,and treatment of data usually were not clearly established in product specifications. It is intended that these test methods and practices will contain all requirements for the determination of chemical composition of steel,stainless steel,or related alloys so that product specifications will need contain only special modifications and exceptions 1.7 This international standard was developed in accor- 1.Scope* dance with internationally recognized principles on standard 1.1 These test methods and practices cover definitions, ization established in the Decision on Principles for the reference methods,practices,and guides relating to the chemi- Development of International Standards,Guides and Recom- cal analysis of steel,stainless steel,and related alloys.They mendations issued by the World Trade Organization Technical include both wet chemical and instrumental techniques Barriers to Trade (TBT)Committee. 1.2 Directions are provided for handling chemical requirements,product analyses,residual elements,and refer- 2.Referenced Documents ence standards,and for the treatment and reporting of chemical 2. 1 ASTM Standards?? analysis data. A941 Terminology Relating to Steel,Stainless Steel, Related 1.3 These test methods and practices apply only to those Alloys,and Ferroalloys product standards which include these test methods and E29 Practice for Using Significant Digits in Test Data to practices,or parts thereof,as a requirement. Determine Conformance with Specifications E50 Practices for Apparatus,Reagents,and Safety Consid- 1.4 In cases of conflict,the product specification require- erations for Chemical Analysis of Metals,Ores,and ments shall take precedence over the requirements ofthese test Related Materials methods and practices. E60 Practice for Analysis of Metals,Ores, and Related 1.5 Attention is directed to ISO/IEC 17025 when there may Materials by Spectrophotometry be a need for information on criteria for evaluation oftesting E322 Test Method for Analysis of Low-Alloy Steels and laboratories Cast Irons by Wavelength Dispersive X-Ray Fluorescence 1.6 This standard does not purport to address all ofthe Spectrometry (Withdrawn 2021)3 safety concerns,if any,associated with its use.It is the E350 Test Methods for Chemical Analysis of Carbon Steel responsibility ofthe user ofthis standard to establish appro- Low-Alloy Steel,Silicon ElectricalSteel,Ingot Iron,and priate safety,health,and environmental practices and deter- Wrought Iron mine the applicability ofregulatory limitations prior to use E352 Test Methods for Chemical Analysis of Tool Steels and 'These test methods and practices are under the jurisdiction of ASTM Commit tee A01 on Steel,Stainless Steeland Related Alloys and are the direct responsibility 2For referenced ASTM standards,visit the ASTM website,www.astm.org.or of Subcommittee A01.13 on Mechanical and Chemical Testing and Processing