【国外标准】 Standard Test Methods for Chemical Analysis of Chromium and Ferrochromium

4.1 These test methods for the chemical analysis of chromium metal and ferrochromium alloy are primarily intended to test such materials for compliance with compositional specifications such as Specifications A101 and A481. It is assumed that all who use these test methods will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that work will be performed in a properly equipped laboratory.1.1 These test methods cover the chemical analysis of chromium and ferrochromium having chemical compositions within the following limits:  Element Composition, %  Aluminum 0.25 max  Antimony 0.005 max  Arsenic 0.005 max  Bismuth 0.005 max  Boron 0.005 max  Carbon 9.00 max  Chromium   51.0 to 99.5  Cobalt 0.10 max  Columbium 0.05 max  Copper 0.05 max  Lead 0.005 max  Manganese 0.75 max  Molybdenum 0.05 max  Nickel 0.50 max  Nitrogen 6.00 max  Phosphorus 0.03 max  Silicon 12.00 max  Silver 0.005 max  Sulfur 0.07 max  Tantalum 0.05 max  Tin 0.005 max  Titanium 0.50 max  Vanadium 0.50 max  Zinc 0.005 max  Zirconium 0.05 max1.2 The analytical procedures appear in the following order:  SectionsArsenic by the Molybdenum Blue Spectrophotometric Test Method [0.001 % to 0.005 %] 10 – 20Lead by the Dithizone Spectrophotometric Test Method [0.001 % to 0.05 %] 21 – 31Chromium by the Sodium Peroxide Fusion-Titrimetric Test Method [50.0 % to 99.5 %] 32 – 381.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 6 and in special “Warning” paragraphs throughout these test methods.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.