ASTM A751-14 pdf free download.StandardTest Methods, Practices, and Terminology for Chemical Analysis of Steel Products.
1.1 These test methods, practices, and terminology cover definitions, reference methods, practices. and guides relating to the chemical analysis of steel, stainless steel, and related alloys. It includes both wet chemical and instrumental technicals.
1 .2 Directions are provided for handling chemical requirements, product analyses, residual elements, and reference standards, and for the treatment and reporting of chemical analysis data.
1.3 These test methods, practices, and terminology apply only to those product standards which include these test methods, practices, and terminology, or parts thereof, as a requirement.
1.4 In cases of conflict, the product specification requirements shall take precedence over the requirements of these test methods, practices, and terminology.
1.5 Attention is directed to ISO/IEC 17025 when there may be a need for information on criteria for evaluation of testing laboratories.
3. 1. 1 .3 product analysis tolerances (Note 2)—a permissible variation over the maximum limit or under the minimum limit of a specified element and applicable only to product analyses. not cast or heat analyses.
Nom 2—The term ‘analysis tolerance” is often misunderstood. It does not apply to cast or heat analyses determined to show conformance to specified 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 specified limits. For example, stainless steel UNS 30400 limits for chromium are 18.00 to 20.00 ‘k. A heat that the producer reported as 18.01 % chromium may be found to show 17.80% chromium by a user performing a product analysis. lithe product analysis tolerance for such a chromium level is 0.20 %, the product analysis of 17.80 % chromium would be acceptable. A product analysis of 17.79 % would not be acceptable.
3. 1. 1 .4 proprietarY analytical method—a non-standard analytical method, not published by ASTM, utilizing reference standards traceable to the National Institute of Standards and Technology (NIST) (when available) or other sources referenced in Section 10.
3.1.1.5 referee analysis—performed using ASTM methods listed in 9.1.1 and NIST reference standards or methods and reference standards agreed upon between parties. The selection of a laboratory to perform the referee analysis shall be a matter of agreement between the supplier and the purchaser.
3.1.1.6 certified reference material—a specimen of material specially prepared, analyzed, and certified for chemical content under the jurisdiction of a recognized standardizing agency or group, such as the National Institute of Standards and Technology, for use by analytical laboratories as an accurate basis for comparison. Reference samples should bear sufficient resemblance to the material to be analyzed so that no significant differences are required in procedures or corrections (fhr example. for interferences or inter-element effects).ASTM A751 pdf dopwnload.