ASTM E352-2018 pdf free download

ASTM E352-2018 pdf free download.Standard Test Methods for Chemical Analysis of Tool Steels and Other Similar Medium- and High-Alloy Steels
4. Significance and Use
4.1 These test methods for the chemical analysis of metals and alloys are primarily intended as referee methods to test such materials for compliance with compositional specifica- tions particularly those under the jurisdiction of ASTM Com- mittee A01 on Steel, Stainless Steel, and Related Alloys. 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 under appropriate quality control practices such as those described in Guide E882.
5. Apparatus, Reagents, and Instrumental Practices
5.1 Apparatus—Specialized apparatus requirements are listed in the “Apparatus” Section in each method. 5.1.1 In the methods specifying spectrophotometric testing, the cells utilized to contain the reference material solutions and sample solutions in spectrophotometers are referred to as “absorption cells”. Please note that the radiant energy passed through the cells can be measured as absorbance or transmit- tance. These methods refer to absorbance measurements. Refer to Practices E60 for details. 5.2 Reagents: 5.2.1 Purity of Reagents—Unless otherwise indicated, all reagents used in these test methods shall conform to the “Reagent Grade” Specifications of the American Chemical Society. 5 Other chemicals may be used, provided it is first ascertained that they are of sufficiently high purity to permit their use without adversely affecting the expected performance of the determination, as indicated in the section on “Precision and Bias.” 5.2.2 Purity of Water—Unless otherwise indicated, refer- ences to water shall be understood to mean reagent water as conforming to Type I or Type II of Specification D1193. Type III or IV may be used ifthey effect no measurable change in the blank or sample. 5.3 Spectrophotometric Practice—Spectrophotometric practice prescribed in these test methods shall conform to Practice E60.
13. Interferences
13.1 HClO 4 treatment, which is used in the procedure, yields solutions which can be highly colored due to the presence ofCr (VI) ions. Although these ions and other colored ions in the sample solution undergo no further change in color quality upon treatment with metaperiodate ion, the following precautions must be observed when filter spectrophotometers are used: Select a filter with maximum transmittance between 545 nm and 565 nm. The filter must transmit not more than 5 % ofits maximum at a wavelength shorter than 530 nm. The band width of the filter should be less than 30 nm when measured at 50 % of its maximum transmittance. Similar restrictions apply with respect to the wavelength region employed when other “wide-band” instruments are used. 13.2 The spectral transmittance curve of permanganate ions exhibits two useful minima, one at approximately 526 nm, and the other at 545 nm. The latter is recommended when a “narrow-band” spectrophotometer is used. 13.3 Tungsten, when present in amounts ofmore than 0.5 % interferes by producing a turbidity in the final solution. A special procedure is provided for use with samples containing more than 0.5 % tungsten which eliminates the problem by preventing the precipitation of the tungsten.
14. Reagents
14.1 Manganese, Standard Solution (1 mL = 0.032 mg Mn)—Transfer the equivalent of 0.4000 g of assayed, high- purity manganese (purity: 99.99 % minimum), to a 500-mL volumetric flask and dissolve in 20 mL of HNO 3 by heating. Cool, dilute to volume, and mix. Using a pipet, transfer 20 mL to a 500-mL volumetric flask, dilute to volume, and mix. 14.2 Nitric-Phosphoric Acid Mixture—Cautiously, while stirring, add 100 mL of HNO 3 and 400 mL of H 3 PO 4 to 400 mL of water. Cool, dilute to 1 L, and mix. Prepare fresh as needed. 14.3 Potassium Metaperiodate Solution (7.5 g/L)—Dissolve 7.5 g of potassium metaperiodate (KIO 4 ) in 200 mL of hot HNO 3 (1 + 1), add 400 mL of H 3 PO 4 , cool, dilute to 1 L, and mix. 14.4 Water.