ASTM B577-2019 pdf free download
ASTM B577-2019 pdf free download.Standard Test Methods for Detection of Cuprous Oxide (Hydrogen Embrittlement Susceptibility) in Copper
1. Scope
1.1 These test methods describe procedures for determining the presence of cuprous oxide (Cu 2 O) in products made from deoxidized and oxygen-free copper.1.3 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 deoxidized copper, n—material produced substantially free of cuprous oxide, by the use of metallic or metalloidal deoxidizers, as determined by metallographic examination at 75× under polarized light, or dark field illumination. Oxygen may be present as residual deoxidation products. 3.1.2 oxygen-free copper, n—electrolytic copper produced substantially free of cuprous oxide without the use of metallic or metalloidal deoxidizers as determined by metallographic examination at 75× under polarized light, or dark field illumi- nation. Oxygen may be present up to a maximum of 5 ppm in Copper UNS No. C10100 and 10 ppm in Copper UNS No. C10200.
4. Summary of Test Methods
4.1 The presence of cuprous oxide is determined either by microscopical examination under polarized light, or dark field illumination or by methods that involve heating the test specimens in a hydrogen-rich atmosphere and rapidly cooling the specimens without undue exposure to air followed by a microscopical examination or a suitable bend test.
5. Significance and Use
5.1 These test methods determine whether copper products will be resistant to embrittlement when exposed to elevated temperatures in a reducing atmosphere. 5.1.1 It is assumed that all who use these test methods will be trained personnel capable of performing these procedures skillfully and safely. It is expected that work will be performed in a properly equipped facility.
6. Apparatus
6.1 Test Method A—Metallographic equipment of the type described in Guide E3 and Guide E883 suitably equipped with polarized light or dark field illuminating capacities. 6.2 Test Methods B, C, and D: 6.2.1 Metallographic equipment of the type described in Guide E3 and Guide E883 provided with normal illumination. 6.2.2 A furnace of sufficient capacity, capable of maintain- ing the required reducing atmosphere while the specimens are being heated. A rapid cooling device using either water or a reducing atmosphere is required. 6.2.3 A machinist vise with replaceable matching pairs of jaw mandrels of various radii contours.
7. Sampling
7.1 Sampling shall be in accordance with the requirements of the specification under which the material was ordered. 8. Test Specimens 8.1 Longitudinal specimens, that is, specimens whose axes are parallel to the direction of working are preferable. However, equally reliable results can be obtained with speci- mens in which the axis is perpendicular to the direction of working. 8.2 Specimens shall be of dimensions suitable for the performance of the required tests. Where necessary to cut a specimen from an oversize piece ofmaterial, at least one ofthe original surfaces of the material shall be retained in the test specimen.
