1.1 本规范涵盖了多孔铁基金属套筒、法兰、推力和球面轴承的要求，这些轴承由使用粉末冶金（PM）技术的金属粉末制成，然后浸渍油以提供运行润滑。 1.2 列出了专门为制造自润滑轴承而开发的标准含铁粉末冶金材料的化学、物理和机械规范。 1.3 本规范是规范的配套文件 B438页 这涵盖了多孔浸油青铜底座轴承的要求。 1.4 本文讨论了自润滑铁基永磁轴承的典型应用 附录X1 . 1.5 商用轴承尺寸公差数据如所示 附录X2 ，而有关永磁轴承安装和运行参数的工程信息包含在 附录X3 . 有关自润滑轴承的其他有用信息，请参阅MPIF标准35（轴承）、ISO 5755和技术文献。 2. 1.6 单位- 除用于确定密度的密度值和质量值外，使用克每立方厘米（g/cm 3. )而克（g）单位是粉末冶金行业的长期惯例，以英寸-磅单位表示的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不应视为标准值。 1.7 以下安全隐患警告仅适用于本规范中描述的测试方法。 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers the requirements for porous iron-base metallic sleeve, flange, thrust, and spherical bearings that are produced from metal powders utilizing powder metallurgy (PM) technology and then impregnated with oil to supply operating lubrication. 1.2 Listed are the chemical, physical, and mechanical specifications for those standardized ferrous PM materials that have been developed specifically for the manufacture of self-lubricating bearings. 1.3 This specification is a companion to Specification B438 that covers the requirements for porous oil-impregnated bronze-base bearings. 1.4 Typical applications for self-lubricating iron-base PM bearings are discussed in Appendix X1 . 1.5 Commercial bearing dimensional tolerance data are shown in Appendix X2 , while engineering information regarding installation and operating parameters of PM bearings is included in Appendix X3 . Additional useful information on self-lubricating bearings can be found in MPIF Standard 35 (Bearings), ISO 5755, and the technical literature. 2 1.6 Units— With the exception of the values for density and the mass used to determine density, for which the use of the gram per cubic centimetre (g/cm 3 ) and gram (g) units is the long-standing practice of the PM industry, the values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not to be regarded as standard. 1.7 The following safety hazards caveat pertains only to the test methods described in this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.