ASTM A866-94

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: A 866 – 94 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 Specification for
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Medium Carbon Anti-Friction Bearing Steel
This standard is issued under the fixed designation A 866; 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.
1. Scope 4. Materials and Manufacture
4.1 Process:
1.1 This specification covers medium carbon bearing qual-
4.1.1 The steel shall be made by a process that is capable of
ity steel to be used in the manufacture of anti-friction bearings.
providing a high quality product meeting the requirements of
1.2 Supplementary requirements of an optional nature are
this specification.
provided and when desired shall be so stated in the order.
1.3 The values stated in inch-pound units are to be regarded
5. Chemical Composition and Analysis
as the standard.
5.1 Typical examples of chemical composition are shown in
Table 1. Other compositions may be specified.
2. Referenced Documents
5.2 An analysis of each heat of steel shall be made by the
2.1 ASTM Standards:
steel manufacturer in accordance with Test Methods, Practices,
A 29/A29M Specification for Steel Bars, Carbon and Alloy,
and Terminology A 751. The chemical composition thus deter-
Hot-Wrought and Cold-Finished, General Requirements
mined shall conform to the requirements specified in Table 1
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for
for the ordered grade or to other requirements agreed upon
A 751 Test Methods, Practices, and Terminology for
between the manufacturer and the purchaser.
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Chemical Analysis of Steel Products
5.3 Product analysis may be made by the purchaser in
E 45 Practice for Determining the Inclusion Content of
accordance with Test Methods, Practices, and Terminology
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Steel
A 751. Permissible variations in product analysis shall be in
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E 112 Test Methods for Determining Average Grain Size
accordance with Specification A 29/A 29M.
E 381 Test Method for Macrotech Testing, Inspection and
6. Sizes, Shapes, and Dimensional Tolerances
Rating Steel Products, Comprising Bars, Billets, Blooms,
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and Forgings 6.1 The physical size and shape of the material shall be
E 1019 Test Methods for Determination of Carbon, Sulfur,
agreed upon between the manufacturer and the purchaser.
Nitrogen, Oxygen, and Hydrogen in Steel and in Iron, 6.2 Dimensional tolerances for hot-rolled or hot-rolled and
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Nickel, and Cobalt Alloys
annealed bars, in straight lengths or coils, and cold-finished
E 1077 Test Method for Estimating the Depth of Decarbur- bars 0.500 in. (12.7 mm) and larger in diameter furnished under
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ization of Steel Specimens
this specification shall conform to the requirements specified in
the latest edition of Specification A 29/A 29M.
3. Ordering Information
6.3 Dimensional tolerances for cold-finished coils for ball
and roller material shall be as shown in Table 2.
3.1 Orders for material under this specification should
6.4 Coil tolerances also apply to cold-finished straight
include the following information:
lengths under 0.500 in. in diameter.
3.1.1 Quantity (weight or pieces),
3.1.2 Grade identification,
7. Quality Tests
3.1.3 ASTM designation and year of issue,
7.1 The supplier shall be held responsible for the quality of
3.1.4 Dimensions, and
the material furnished and shall make the necessary tests to
ensure this quality. The supplier shall be required to report on
3.1.5 Supplementary requirements, if included.
the results of the macroetch and micro-inclusion rating tests
detailed below. Quality tests shown in 7.2 through 7.4 are
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This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
based upon procedures established in Practice E 45.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
7.2 Sampling—Samples taken in accordance with the fol-
A01.28 on Bearing Steels.
Current edition approved June 15, 1994. Published August 1994. Originally lowing paragraphs shall be obtained from 4 by 4 in. (102 by
published as A 866 – 87. Last previous edition A 866 – 92.
102 mm) rolled billets or forged sections. Tests may be made
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Annual Book of ASTM Standards, Vol 01.05.
on smaller or larger sections by agreement with the purchaser.
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Annual Book of ASTM Standards, Vol 01.03.
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A minimum 3 to 1 reduction of rolled billets or forged sections
Annual Book of ASTM Standards, Vol 03.01.
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Annual Book of ASTM Standards, Vol 03.06. is required for strand cast products.
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A 866
A
TABLE 1 Chemical Composition
AISI/SA
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