1.1 这种做法 2. 介绍了钢锻件的磁粉检测程序。该程序将产生一致的结果，作为验收标准的依据。本规程不包含验收标准或推荐的质量水平。 1.2 任何磁化方法只能使用直流或整流交流（全波或半波）电流作为电源。不允许使用交流电，因为它检测地下不连续性的能力非常有限，因此不合适。 1.2.1 便携式电池供电电磁轭不在本规范的范围内。 注1: 指导 E709 可用于最初由钢锻件制造的机械部件的现场磁粉检测。 1.3 磁粉检测的最低要求应符合实践标准 4444欧元/4444米欧元 .如果本规程的要求与规程的要求相冲突 4444欧元/4444米欧元 ，应以本规程的要求为准。 1.4 本规程和适用的材料规范以英寸磅单位和国际单位制表示。然而，除非订单规定了适用的“M”规格名称[SI单位]，否则材料应以英寸磅单位提供。 1.5 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值不一定是精确的等效值；因此，为了确保符合标准，每个系统应独立使用，并且两个系统的值不应合并。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 对于铁磁性材料，磁粉检测被广泛用于检测表面和近表面的不连续性，如裂纹、搭接、接缝和线性取向的非金属夹杂物。 此类检查作为强制性要求包含在一些锻造标准中，如规范 508万澳元/508万澳元 . 4.2 使用直流或整流交流（全波或半波）电流作为磁粉检测的电源，可以检测地下不连续性。

1.1 This practice 2 covers a procedure for magnetic particle examination of steel forgings. The procedure will produce consistent results upon which acceptance standards can be based. This practice does not contain acceptance standards or recommended quality levels. 1.2 Only direct current or rectified alternating (full or half wave) current shall be used as the electric power source for any of the magnetizing methods. Alternating current is not permitted because its capability to detect subsurface discontinuities is very limited and therefore unsuitable. 1.2.1 Portable battery powered electromagnetic yokes are outside the scope of this practice. Note 1: Guide E709 may be utilized for magnetic particle examination in the field for machinery components originally manufactured from steel forgings. 1.3 The minimum requirements for magnetic particle examination shall conform to practice standards of Practice E1444/E1444M . If the requirements of this practice are in conflict with the requirements of Practice E1444/E1444M , the requirements of this practice shall prevail. 1.4 This practice and the applicable material specifications are expressed in both inch-pound units and SI units. However, unless the order specifies the applicable “M” specification designation [SI units], the material shall be furnished to inch-pound units. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.6 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. 1.7 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. ====== Significance And Use ====== 4.1 For ferromagnetic materials, magnetic particle examination is widely specified for the detection of surface and near surface discontinuities such as cracks, laps, seams, and linearly oriented nonmetallic inclusions. Such examinations are included as mandatory requirements in some forging standards such as Specification A508/A508M . 4.2 Use of direct current or rectified alternating (full or half wave) current as the power source for magnetic particle examination allows detection of subsurface discontinuities.