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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This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? When so included, a supplementary requirement shall have the same force as if it were in the body of the speci? Decarburization shall be measured using the microscopical methods described in Test Method E A number in parentheses indicates the year of last reapproval.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. 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.
Historical Version s – view previous versions of standard.
Results are commonly expressed in millimeters per square metre. The chemical composition thus determined shall conform to the requirements speci? Combining values from the two systems may result in non-conformance with the standard. All tests and inspections shall be made at the place of manufacture, unless otherwise agreed to. A minimum 3 to 1 reduction of rolled billets or forged sections is required for strand cast products.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The magnetic particle method measures bearing steel cleanliness by evaluating the total length of macro-inclusions for a stated area or per unit area.
Fields with sizes or numbers of all types of inclusions intermediate between con? Where a single usable plate constitutes a heat, any three random ingots may be selected.
Special requirements agreed to at the time of purchase shall be noted on the certi? It is informational only qstm not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Sizes, Ast, and Dimensional Tolerances 6. The sum of all lengths for each specimen shall be determined and expressed as total length per area inspected. Lamellar content of other compositions shall be as agreed upon between manufacturer and purchaser.
Sample Reduction Ratio S5. Sulfur Requirement for Machinability S4. Quality tests shown in 7. Last previous edition A — Decarburization and surface imperfections shall not exceed the limits also specified herein. Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless speci? The polished face shall be longitudinal to the direction of rolling. ASTM International takes no position respecting the validity of aatm patent rights asserted in connection with any item mentioned in this aa295.
Chemical Composition and Analysis 5.
ASTM A / AM – 09 Standard Specification for High-Carbon Anti-Friction Bearing Steel
This abstract is a brief summary of the referenced standard. Astn to Active This link will always route to the current Active version of the standard.
Other compositions may be speci? The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The scale used for rating the specimens shall be the Jernkontoret chart described in Practice E 45, Plate I-r.
At least one sample shall be taken from each strand.
ASTM A295, High-Carbon Bearing Steel
This specification covers high-carbon bearing-quality steel to be used in the manufacture of anti-friction bearings. Steels shall exhibit fine fracture grain size when quenched from normal austenitizing temperatures. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Originally published satm A — 46 T. Magnetic Particle Method S3. D Oxygen content applies to product analysis satm 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. One ingot shall be taken at random from the? This standard has been approved for use by agencies of the Department of Defense.
Materials shall conform to chemical compositions as specified herein, and to physical size and shape as agreed upon between the manufacturer and purchaser. Tests may be made on smaller or larger sections by agreement between manufacturer and purchaser.
ASTM A – 98 Standard Specification for High-Carbon Anti-Friction Bearing Steel
Decarburization and Surface Imperfections 9. When annealing is specified in the order, the steel shall adhere to hardness requirements and have a completely spheroidized microstructure, which shall accordingly be rated and reported as carbide size, carbide network, and lamellar content.
When two usable plates constitute a heat, two of the sample ingots shall be selected from the second usable plate poured. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Current edition approved Dec. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.