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ASTM

ASTM A756-94

(Specification)

Standard Specification for Stainless Anti-Friction Bearing Steel

Standard Specification for Stainless Anti-Friction Bearing Steel

SCOPE
1.1 This specification covers the requirements for chromium-carbon bearing quality stainless steel to be used in the manufacture of anti-friction bearings.
1.2 Supplementary Requirements of an optional nature are provided and when desired shall be so stated in the order.
1.3 The values stated in inch-pound units are to be regarded as the standard.

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
Current Stage
Ref Project

Relations

Replaced By
ASTM A756-94(2001) - Standard Specification for Stainless Anti-Friction Bearing Steel
Effective Date
01-Jan-2001

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ASTM A756-94 - Standard Specification for Stainless Anti-Friction Bearing Steel
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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 756 – 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
1
Stainless Anti-Friction Bearing Steel
This standard is issued under the fixed designation A 756; 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. Process
1.1 This specification covers the requirements for 4.1 The steel shall be made by a process that is capable of
chromium-carbon bearing quality stainless steel to be used in providing a high-quality product meeting the requirements of
the manufacture of anti-friction bearings. this specification.
1.2 Supplementary Requirements of an optional nature are
5. Chemical Composition
provided and when desired shall be so stated in the order.
5.1 Typical examples of chemical compositions are shown
1.3 The values stated in inch-pound units are to be regarded
in Table 1. Other compositions may be specified.
as the standard.
5.2 An analysis of each heat of steel shall be made by the
2. Referenced Documents
steel manufacturer in accordance with Test Methods A 751.
2.1 ASTM Standards: The chemical composition thus determined shall conform to
the requirements specified in Table 1 for the ordered grade or
A 484/A484M Specification for General Requirements for
2
Stainless and Heat-Resisting Bars, Billets and Forgings to requirements agreed upon between the manufacturer and the
purchaser.
A 751 Test Methods, Practices, and Terminology for
2
5.3 Product analysis may be made by the purchaser in
Chemical Analysis of Steel Products
accordance with Test Methods A 751. Permissible variations in
E 45 Practice for Determining the Inclusion Content of
3
product analysis shall be made in accordance with Specifica-
Steel
tion A 484/A 484M.
E 381 Test Method for Macroetch Testing, Inspection, and
Rating Steel Products, Comprising Bars, Billets, Blooms,
6. Dimensions, Mass, and Permissible Variations
3
and Forgings
6.1 The size and shape of the material shall be agreed upon
E 1019 Test Methods for Determination of Carbon, Sulfur,
between manufacturer and purchaser.
Nitrogen, Oxygen, and Hydrogen in Steel and in Iron,
4
6.2 Dimensional tolerances for hot-rolled or hot-rolled and
Nickel, and Cobalt Alloys
annealed bars, in straight lengths or coils, and cold-finished
E 1077 Test Method for Estimating the Depth of Decarbur-
3
bars 0.500 in. (12.7 mm) and larger in diameter furnished under
ization of Steel Specimens
this specification shall conform to the requirements specified in
2.2 Other Standard:
5
the latest edition of Specification A 484/A 484M.
SAE J 418a Grain Size Determination of Steel
6.3 Dimensional tolerances for cold-finished coils for ball
3. Ordering Information
and roller material shall be as shown in Table 2.
6.4 Coil tolerances also apply to cold-finished straight
3.1 Orders for material under specification should include
lengths under 0.500 in. (12.7 mm) in diameter.
the following information:
3.1.1 Quantity,
7. Quality Tests
3.1.2 Grade identification,
7.1 The supplier shall be held responsible for the quality of
3.1.3 Specification designation and year of issue,
the material furnished and shall make the necessary tests to
3.1.4 Dimensions, shape, and
ensure this quality. The supplier shall be required to report on
3.1.5 Supplementary Requirements, if desired.
the results of the macroetch and microinclusion rating tests
detailed below. Quality tests shown in 7.2 through 7.4 are
1
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 Alloysand is the direct responsibility of Subcommittee
7.2 Sampling—Samples taken in accordance with the fol-
A01.28on Bearings Steels
lowing paragraphs shall be obtained from 4 by 4-in. (102 by
Current edition approved June 15, 1994. Published August 1994. Originally
published as A 756 – 78. Last previous edition A 756 – 93. 102-mm) rolled billets or forged sections. Tests may be made
2
Annual Book of ASTM Standards, Vol 01.03.
on smaller or larger sections by agreement with the purchaser.
3
Annual Book of ASTM Standards, Vol 03.01.
A minimum 3 to 1 reduction of rolled billets or forged sections
4
Annual Book of ASTM Standards, Vol 03.06.
5
is required for strand cast products.
Available from Society of Automotive Engineers, 400 Commonwealth Drive,
Warrendale, PA 15096. 7.2.1 For top poured products, a minimum of six samples
1

---------------------- Page: 1 ----------------------
A 756
TABLE 1 Ch
...

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1.1 This specification covers UNS N06002, UNS N06030, UNS N06035, UNS N06022, UNS N06200, UNS N10362, UNS N06230, UNS N06600, UNS N06617, UNS N06625, UNS N08020, UNS N08026, UNS N08024, UNS N08120, UNS N08926, UNS N08367, UNS N10242, UNS N10276, UNS N10665, UNS N10675, UNS N12160, UNS R20033, UNS N06059, UNS N06686, UNS N10629, UNS N08031, UNS N06045, UNS N06025, UNS N06699, and UNS R305562 billets and bars for reforging.  
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