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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After sizing and inspection, they are impregnated with a lubricating oil unless otherwise speci?

Dimensions and Tolerances 9. The Government reserves the right to perform an inspection set forth herein to assure supplies and sources conform to the prescribed requirements.

Materials and Manufacture 4. Sintered bronze bearings shall be made by molding or briquetting metal powder mixtures to the proper density. The maximum running clearances will automatically be held within good design practice for average conditions. Therefore, only minimum recommended aztm are listed in Table X1. Parts can be uniquely shaped or designed to combine two single parts into a complex, one-piece PM part.

The point at which the load Copyright?

Oil Impregnated Sintered Bronze / SAE Products

The part combinations are only limited to the design concept. Satisfactory bearings can also be produced between Type 1 and Type 2. Current edition approved April 1, Your comments v438 receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Use the minimum radial crushing strength value speci? This acceptance procedure can be very useful when evaluating multiple or repeat shipments of qstm same bearing. Link to Active This link will always route to the current Active version of the standard. Bottom flange edge and juncture radii should be generous Shapes bb438 uniform dimensions in the pressing direction are easiest to produce and eject from the press.

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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.

The green bearing shall be sintered at astj time—temperature relationship to produce a microstructure that is essentially alpha bronze and contains no tin-rich phases visible at This test shall be applied to plain cylindrical bearings. Bearing shall conform to this speci?

To obtain oil-free chips, the parts selected for test shall have the oil extracted in accordance with Test Method B if necessary. The lower length to diameter and or length to wall thickness ratios, the easier it becomes to maintain uniform density throughout the part. Second, whole spherical bearings from the same lot are crushed, keeping their axes horizontal, to determine the breaking load of the whole bearing.

It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Dimensions and Tolerances 9. These supplementary requirements shall appear separately. The maximum running clearances will automatically be held within good design practice for average satm.

ASTM B / BM – 00 Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)

awtm A representative sample of chips may be obtained by milling, drilling,? These supplementary requirements shall appear separately.

Must the part be burr-free—what type, amount of corner radius? Reference military standard speci? The maximum static bearing load should not exceed psi [60 MPa] of projected bearing area length times inside diameter of bearing for this material.

This asrm covers sintered bronze, oil-impregnated bearings made primarily from elemental copper, tin, lead, and graphite powders. Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci?

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. This calculated value will be the minimum acceptable breaking load astmm that speci?

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Desigining for P/M

Flanges A comparatively small flange, step, or overhang can often be produced by machining a shelf or step in the die. Since compaction occurs in the vertical direction, using only top and bottom motions, part lengths in the pressing direction are limited. 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.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? This standard has been approved for use by agencies of the Department of Defense. Waivers for minor defects may be addressed to the contracting officer.

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

Originally approved in Will the part be used in a wear application—which surfaces? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? For acceptance, the radial crushing strength so determined astk meet the minimum material strength requirements prescribed in Table 5.

It is assumed that ground steel shafting having a recommended? 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 ashm required chemical composition for copper, tin, graphite, iron, lead, zinc, nickel, and antimony. This value shall not be less than the minimum radial crushing strength speci?