ASTM A892-09 (2020) pdf free.Standard Guide for Defining and Rating the Microstructure of High Carbon Bearing Steels.
1.1 This guide covers the description of carbide structures in annealed high carbon bearing steels.
1.2 Included is a guide for rating steel specimens by a graded series of photomicrographs showing the incidence of certain conditions.
1.3 The reference photomicrographs are graded illustrations of annealed carbides categorized by size, network, and lamellar content (shape).
1.4 This guide is to facilitate communication and description of microstructure. It does not establish limits of acceptability. Such limits are a matter of agreement between user and producer.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 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. .
1.7 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.
4.1 Samples that represent a portion of the cross section of the material shall be prepared using the practices described in Guide E3. The size of the sample shall be negotiated between the user and the producer. It may be a full cross section but should not be too large for practical handling in the polishing operation.
4.2 The properly polished specimens shall be etched in a suitable etchant which will clearly delineate the annealed carbide structure of the material being examined as described in Practice E407. Nital (2 %) will frequently be an adequate etchant for routine examination. When critical or detailed analysis of structures is required, the recommended etchant is Picral (saturated). ASTM A892 pdf download.