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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The magnetic particle method measures bearing steel cleanliness by evaluating the total length of macro-inclusions for a stated area or per unit area.

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. Steels shall exhibit axtm fracture grain size when quenched from normal austenitizing temperatures.

Special requirements agreed to at the time of purchase shall be noted on the certi? A number in parentheses indicates the year of last reapproval. Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless speci? Decarburization and surface imperfections shall not exceed the asym also specified herein.

Decarburization and Surface Imperfections 9. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. When two usable plates constitute a heat, two of the sample ingots shall be selected from the second usable plate poured.

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This standard has been approved for use by agencies of the Department of Defense.

Tests may be made asrm smaller or larger sections by agreement between manufacturer and purchaser. Quality tests shown in 7. Link to Active This link will always route to the current Active version of the standard. Combining values from the two systems may result in non-conformance with the standard. Two thirds of all specimens and at least one from each ingot tested, or from the? Adtm supplier shall be required to report results of the macroetch and micro-inclusion rating tests detailed below.

This standard is subject to revision at any time by the responsible technical committee atm must be reviewed every? Sulfur Requirement for Machinability S4. Last previous edition A — 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.

ASTM A 高碳耐磨轴承钢技术规范_百度文库

Current edition approved Dec. Magnetic Particle Method S3. Where a single usable plate constitutes a heat, any three random ingots may be selected. Materials shall conform to chemical compositions as specified herein, and to physical size and shape as agreed upon between the manufacturer and purchaser. Other compositions may be speci? A — 98 Standard Speci? All tests and inspections shall be made at the place of manufacture, unless otherwise agreed to.

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D Oxygen content applies to product analysis and shall be determined in accordance with Test Method E Historical Version s – view previous versions of aastm. Fields with sizes or numbers of all types of inclusions intermediate between con?

The sum of all lengths for each specimen shall be determined and expressed asgm total length per area inspected. Chemical Composition and Analysis 5. Results are astn expressed in millimeters per square metre.

ASTM A295 Grade 52100 annealed, cold-drawn (stress-relieved) Coils

Sizes, Shapes, and Dimensional Tolerances 6. This abstract is a brief summary of the referenced standard. 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 axtm infringement of such rights, are entirely their own responsibility. A minimum 3 to 1 reduction of rolled billets or forged sections is required for strand cast products.