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ASTM B438 PDF

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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The overall smoothness and surface reflectivity depend on density and the tool finish. This abstract is a brief summary sstm the referenced standard. This standard does not purport to address all satm the safety concerns, if any, associated with its use. Therefore, only minimum recommended clearances are listed in Table X1. This calculated value will be the minimum acceptable breaking load for that speci?

The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Special Tolerancein. Their dimensions are referenced throughout the tolerance tables. Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci?

Therefore, only minimum recommended clearances are listed in Table X1. Astk 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. If necessary, a sintered PM component can be finished or treated just like any other metal component to achieve desired characteristics—corrosion resistance, improved strength and hardness, surface wear resistance, edge-sharpness relief, porosity sealing, and control of size and surface finish.

Fill out the form below for a complimentary copy of our catalog by mail, or click here to view a digital copy. This standard has been approved for use by agencies of the Department of Defense.

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Sample parts from asgm same lot will be radially crushed as is whole part. The contractor may asym their own or any other suitable facility for the performance of testing and inspection, unless an exception is stated.

Is there a region critical to the performance of the part? Sintered bronze bearings shall be made by molding or briquetting metal powder mixtures to the proper density. 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.

Second, whole spherical bearings from the same lot are crushed, keeping their axes horizontal, to determine the breaking load of the whole bearing.

This standard does not purport to address all of the asym concerns, if any, associated with its use. For acceptance, the radial crushing strength, determined on the test bearings, shall not be less than the minimum strength speci? Any defect or failure shall be cause for rejection astmm the lot.

Satisfactory bearings can also be produced between Type 1 and Type 2. Within the text, the SI units are shown in brackets. Atm additional government requirements that only apply to military bearings are listed in the Supplementary Requirements section of this specification. Where the ratio of length-to-wall thickness is as high as 8: Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

The manufacturer may, at his discretion, use prealloyed bronze powder in the mixed powder. Standard chamfer tolerances are also listed in Table X1. The dash numbers remain unchanged from the MS Materials and Manufacture 4. To obtain oil-free chips, the parts selected astj test shall have the oil extracted in accordance with Test Method B if necessary. Use the minimum radial crushing strength value speci?

Powdered Metallurgy Design | National Bronze Manufacturing

Press Fit min, in. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM B48 on Standards, at the address shown below. Avoid designing long, thin walls; they require tooling that is fragile and the parts themselves have a tendency toward density b348.

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Must it be leak tight? Lack of appreciable sweating of the lubricant on the bearing surface will be cause for rejection. Are there any unique packaging requirements? These supplementary requirements shall appear separately. Additionally, unlike components made using other metal forming processes, PM components can be repressed or coined, as well as sized, to densify or modify the surface shape and provide stricter dimensional control.

Press Fit min, in.

Exposure shall be 5 min. The lower length to qstm and or length to wall thickness ratios, the easier it becomes to maintain uniform density throughout the part.

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

Will the part be used in a thermally demanding application? Must the part be protected from corrosion—how severe? The testing procedure and material strength requirements of the? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. We will get in touch with you soon! A representative sample of chips may be obtained by milling, drilling,? Usually these apply only when speci? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

This test shall be applied to plain cylindrical bearings. The viscosity should be speci? A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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