ASTM A892-88(1995)e1

Standard Guide for Defining and Rating the Microstructure of High Carbon Bearing Steels

SCOPE
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 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Dec-2000
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.28 - Bearing and Power Transmission Steels

Relations

• Replaced By: ASTM A892-88(2001) - Standard Guide for Defining and Rating the Microstructure of High Carbon Bearing Steels
• Effective Date: 01-Jan-2001
• Referred By: ASTM A295/A295M-14(2020) - Standard Specification for High-Carbon Anti-Friction Bearing Steel
• Effective Date: 01-Jan-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: A 892 – 88 (Reapproved 1995) An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Guide for
Defining and Rating the Microstructure of High Carbon
Bearing Steels
This standard is issued under the fixed designation A 892; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Keywords were added editorially in March l995
1. Scope section but should not be too large for practical handling in the
polishing operation.
1.1 This guide covers the description of carbide structures in
4.2 The properly polished specimens shall be etched in a
annealed high carbon bearing steels.
suitable etchant which will clearly delineate the annealed
1.2 Included is a guide for rating steel specimens by a
carbide structure of the material being examined as described
graded series of photomicrographs showing the incidence of
in Test Methods E 407. Nital (2 %) will frequently be an
certain conditions.
adequate etchant for routine examination. When critical or
1.3 The reference photomicrographs are graded illustrations
detailed analysis of structures is required, the recommended
of annealed carbides categorized by size, network and lamellar
etchant is Picral (saturated).
content (shape).
1.4 This guide is to facilitate communication and descrip-
5. Description
tion of microstructure. It does not establish limits of accept-
5.1 The reference photomicrographs are arranged into three
ability. Such limits are a matter of agreement between user and
categories as follows: carbide size (CS), carbide network (CN),
producer.
and lamellar content (LC).
1.5 This standard does not purport to address all of the
5.2 Six photomicrographs for each category are provided
safety concerns, if any, associated with its use. It is the
and are identified by category and number, for example,
responsibility of the user of this standard to establish appro-
CS1-CS6, CN1-CN6, and LC1-LC6 as shown in Figs. 1-3.
priate safety and health practices and determine the applica-
Higher numbers indicate a larger number or greater degree of
bility of regulatory limitations prior to use.
severity of the category being rated.
2. Referenced Documents 5.2.1 Actual counted number of carbides per 400 μm
determined from the carbide size series of photomicrographs is
2.1 ASTM Standards:
as follows: (Reported counts are the average of three measure-
E 3
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