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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Desigining for P/M
Exposure shall be 5 min. Waivers for minor defects may be addressed to the contracting officer. Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci? A superscript epsilon e indicates an editorial change since the last revision or reapproval. Exposure shall be 5 min. A number in parentheses indicates the year of last reapproval.
This standard is subject to revision at any time by the responsible technical committee and b348 be reviewed every? Reference military standard speci?
Grades zstm in three bronze base compositions identifiable by different graphite contents and one leaded bronze grade and Type Grades 1 and 2 are available in four types described by specific density ranges.
The viscosity should be speci? The operating environment should be carefully considered: Bearing shall conform to this speci?
After sizing and inspection, they are impregnated with a lubricating oil unless otherwise speci? The manufacturer may, at his discretion, use prealloyed bronze powder in the blend. Link to Active This link will always route to the current Active version of the standard. By correlation, the minimum radial crush bb438 will be established on the whole bearing and so speci? Reference military standard speci?
Then, using the minimum radial crushing strength for the grade and type of oil-impregnated bearing material from Table 5 for K in the breaking load formula and the measured dimensions of the body, a Pmin value may be calculated.
ASTM B / BM – 00 Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)
Will the part be used in a wear application—which surfaces? Rejection should be reported to the producer or supplier promptly and in writing. This abstract is a b48 summary of the referenced standard. Avoid designing long, thin walls; they require tooling that is fragile and the parts themselves have a tendency toward density variation.
Special Tolerancein. The size limitation of PM parts is based on powder compressibility and press tonnage. Astk Bronze Products for over years. The green bearing shall be sintered at a time—temperature relationship to produce a microstructure that is essentially alpha bronze and contains no tin-rich phases visible at Repeated start-stop operation, oscillatory or reciprocating motion, high speeds, shock loads, and temperature extremes tend to decrease permissible loads.
Historical Version s – view previous astk of standard. For housings rigid enough to withstand the press?
The dash numbers remain unchanged from the MS The material of different grades and types shall conform to the prescribed radial crushing strength requirements. Contact us to discuss your specific part requirements.
Plating, coating, deburring, welding, furnace brazing, heat treating, and steam treating are among the secondary operations that are used successfully in the process of fabricating finished PM parts. The part combinations are only limited to the design concept.
Last previous edition approved in as B — 00a. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Oil Impregnated Sintered Bronze / SAE Products
Originally approved in This standard does not purport to address all of the safety concerns, if any, associated with its use. Will the part be welded? This specification covers the following variables: The testing procedure and material strength asmt of the? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Usually these apply only when speci? Dimensions and Tolerances 9. Aetm Government reserves the right to perform an inspection set forth herein to assure supplies and sources conform to the prescribed requirements. It is determined by breaking plain, thin-walled bearings or hollow cylindrical test specimens under diametrical loading, following the procedure asrm in Test Method Band calculating the radial crushing strength according the material strength formula contained herein.
Any defect or failure shall be cause for rejection of the lot. Workmanship, Finish, and Appearance