ASTM A specification covers high-carbon bearing-quality steel to be used in the manufacture of anti-friction bearings. The most common. ASTM A 高碳耐磨轴承钢技术规范 – Designation: A – 98 Standard Speci?cation for High-Carbon Anti. ASTM A/AM Standard Specification for High-Carbon Anti-Friction Bearing Steel. standard by ASTM International, 10/01/ View all product details.
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A — 98 Standard Speci?
ASTM A295 Grade 52100 annealed, cold-drawn (stress-relieved) Coils
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. Current edition approved Dec. Originally published as A — 46 T.
Last previous edition A — Chemical Composition and Analysis 5. Other compositions may be speci? The chemical composition thus determined shall conform to the requirements speci? Permissible variations in product analysis shall be in accordance with Speci? Sizes, Shapes, and Dimensional Tolerances 6. Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless speci? 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.
ASTM A / AM – 14 Standard Specification for High-Carbon Anti-Friction Bearing Steel
One ingot shall be taken at random from the? 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 described in Practice E 45, Plate I-r. Fields with sizes or numbers of all types of inclusions intermediate between con? Two thirds of all specimens and at least one from atm ingot tested, or from the?
Decarburization and Surface Imperfections 9. Decarburization shall be measured using the microscopical methods described in Test Method E Lamellar content of other compositions shall be as agreed upon between manufacturer and purchaser.
All tests and inspections shall be made at the place of manufacture, unless otherwise agreed to. Special requirements agreed to at the time of purchase shall be noted on the certi? When so included, a supplementary requirement shall have the same force as if it were in the body of the speci?
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. ASTM International 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?
ASTM A / AM – 09 Standard Specification for High-Carbon Anti-Friction Bearing Steel
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