Historical Version s - view previous versions of standard. More A This specification covers high-carbon bearing-quality steel to be used in the manufacture of anti-friction bearings. Materials shall conform to chemical compositions as specified herein, and to physical size and shape as agreed upon between the manufacturer and purchaser. Steels shall exhibit fine fracture grain size when quenched from normal austenitizing temperatures.

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ASTM F ASTM B r ASTM D ASTM ASTM A A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. Referenced Documents 2. Current edition approved Dec. Published February Originally published as A — 46 T. Last previous edition A — Ordering Information 3. Process 4.

Chemical Composition and Analysis 5. Other compositions may be specied. The chemical composition thus determined shall conform to the requirements specied in Table 1 for the ordered grade or to other requirements agreed upon between manufacturer and purchaser.

Sizes, Shapes, and Dimensional Tolerances 6. Quality Tests 7. Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless specically approved by the purchaser. B1, CR6. D Oxygen content applies to product analysis and shall be determined in accordance with Test Method E The supplier shall be required to report results of the macroetch and micro-inclusion rating tests detailed below.

Quality tests shown in 7. Tests may be made on smaller or larger sections by agreement between manufacturer and purchaser. A minimum 3 to 1 reduction of rolled billets or forged sections is required for strand cast products. One ingot shall be taken at random from the rst usable plate poured, one ingot, at random, from the usable plate poured nearest to the middle of the heat, and one ingot, at random, from the last usable plate poured.

When two usable plates constitute a heat, two of the sample ingots shall be selected from the second usable plate poured. Where a single usable plate constitutes a heat, any three random ingots may be selected.

Other methods of sampling shall be as agreed upon between manufacturer and purchaser. At least one sample shall be taken from each strand.

The polished face shall be longitudinal to the direction of rolling. The scale used for rating the specimens shall be the Jernkontoret chart 2 described in Practice E 45, Plate I-r. Fields with sizes or numbers of all types of inclusions intermediate between congurations shown on the chart shall be classied as the lesser of the rating number.

The worst eld of each inclusion type from each specimen shall be recorded as the rating for the specimen. Two thirds of all specimens and at least one from each ingot tested, or from the rst, middle, and last portion of the strands tested, as well as the average of all specimens, shall not exceed the rating specied in Table 3.

If specically ordered and certied to Supplementary Requirement S4, Type A inclusion ratings shall not exceed 3. See S4. Grain Size 8. Decarburization and Surface Imperfections 9.

Decarburization shall be measured using the microscopical methods described in Test Method E Microstructure Lamellar content of other compositions shall be as agreed upon between manufacturer and purchaser.

Hardness Inspection All tests and inspections shall be made at the place of manufacture, unless otherwise agreed to. Certication and Reports Special requirements agreed to at the time of purchase shall be noted on the certication.

Rockwell B When so included, a supplementary requirement shall have the same force as if it were in the body of the specication. Titanium Content S1. Magnetic Particle Method S3. The magnetic particle method measures bearing steel cleanliness by evaluating the total length of macro-inclusions for a stated area or per unit area. Results are commonly expressed in millimeters per square metre.

The sum of all lengths for each specimen shall be determined and expressed as total length per area inspected. Sulfur Requirement for Machinability S4. Sample Reduction Ratio S5. The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.


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