ASTM B438 PDF

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ASTM B Standard Specification for Bronze-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated). ASTM – B, Grade 1, Type II; MPIF – CTK26; Military – MIL-BD, Type I, Grade I (this spec only applies to Bushings & Washers. It must be requested. ASTM – B, Grade 1, Type II. Military – MIL-BD, Type I, Comp. A. MPIF – CTK Heavy industry uses Sintered Bronze as machinery components.

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Special tolerances should not be speci? To obtain oil-free chips, the parts selected for test shall have the oil extracted in accordance with Test Method B if necessary. Usually these apply only when speci?

B Outside diameter tolerances are the same as for? The contractor may use their own or any other suitable facility for the performance of testing and inspection, unless an exception is stated. The material shall conform to the required chemical composition for copper, tin, graphite, iron, lead, zinc, nickel, and antimony.

Must the part be burr-free—what type, amount of corner radius? As a general rule, walls should not be thinner than 0. Four samples shall be made available for?

Desigining for P/M

Contact us to discuss your specific b483 requirements. The dash numbers remain unchanged from the MS Within the text, the SI units are shown in brackets. This specification covers the following variables: Current edition approved Nov. Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci? This acceptance procedure can be very useful when evaluating multiple or repeat shipments of the same 4b38.

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The dash numbers remain unchanged from the MS This will be the minimum bearing breaking load required for the body of that speci?

Chemical analysis shall be made for each ashm sample of chips, which may be obtained by milling, drilling, filing, or crushing a bearing with clean dry tools without lubrication.

This specification covers sintered bronze, oil-impregnated bearings made primarily from elemental copper, tin, lead, and graphite powders. For housings rigid enough to withstand the press? The appropriate layout of the components geometry and the selection of suitable material according to the PM process has a strong influence on tool life and consequently on the asttm of the part.

Oil Impregnated Sintered Bronze / SAE Products

astmm It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Materials and Manufacture 4.

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Will the part be welded? Will the part be used in a high-impact-loaded application?

A number in parentheses indicates the year of last reapproval. The size limitation of PM parts is based on powder compressibility and press tonnage. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Satisfactory bearings can also be produced between Type 1 and Type 2. This value shall not be less than the minimum radial crushing strength speci?

Oil Impregnated Sintered Bronze – plate, cored bar, solid bar & bushings

A representative sample of chips may be obtained by milling, drilling,? Your comments will receive careful consideration at a meeting of the responsible technical committee, adtm you may attend.

The contractor may use their own or any other suitable facility for the performance of testing and inspection, unless an exception is stated.

Rejection should be reported to the producer or supplier promptly and in writing. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.