1.1 本试验方法描述了机械试验方法，并定义了可能导致钢氢脆的涂层和电镀工艺的验收标准。还可以评估随后在使用环境中遇到的化学品，例如与钢的电镀/涂层或裸露表面接触的液体、清洁处理或维护化学品。 1.2 本试验方法不用于测量不同钢材的相对磁化率。可根据试验方法确定不同材料对氢脆的相对敏感性 F1459 和试验方法 F1624 . 1.3 本试验方法规定了使用空气熔炼SAE 4340钢（A级，见 7.1.1 )根据SAE AMS 6415（以前为SAE AMS-S-5000，以前为MIL- S-5000）或替代VAR（真空电弧重熔）SAE 4340钢（B级，见 7.1.1 )根据SAE AMS 6414，将两者热处理至260至280 ksi（磅/平方英寸×1000）作为基准。这种合金和热处理水平的结合已经使用了多年，航空航天行业积累了一个大型数据库，了解其对暴露于各种维护化学品或电镀涂层或两者的具体反应。极限强度高于260至280 ksi的部件可能无法用基线表示。在这种情况下，认可的工程当局应确定是否需要从部件的特定材料和热处理条件中制造试样。应根据要求报告与基线的偏差 12.1.2 . 应证明每批试样的氢脆敏感性，如 9.5 . 注1: 广泛的测试表明，VAR 4340钢可以作为空气熔炼钢的替代品，而不会损失灵敏度。 2. 注2: VAR 4340还符合AMS 6415中的要求，可作为钢铁供应商空气熔炼钢的替代品，因为AMS 6415未规定熔炼实践。 1.4 规定了七个不同尺寸、几何形状和负载配置的试样的试验程序和验收要求。 1.5 通过/失败要求- 对于电镀/涂层工艺，样品必须达到或超过200小时，使用持续负载测试（SLT），测试水平如所示 表3 . 1.5.1 服务环境的加载条件和通过/失败要求在 附件A5 . 1.5.2 如果经认可的工程管理局批准，则定量、加速( ≤ 24小时）增量阶跃负载（ISL）测试，如 附件A3 可作为SLT的替代品。 1.6 本试验方法分为两部分。第一部分给出了有关氢脆试验要求的一般信息。第二部分由附录组成，这些附录给出了本试验方法涵盖的各种载荷和试样配置的具体要求（见第节） 9.1 类型列表）和测试服务环境的详细信息。 1.7 英尺-磅-秒（fps）系统中以英寸-磅单位表示的值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.8 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。 1.9 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。 ====意义和用途====== 5.1 电镀/涂层工艺- 本试验方法提供了一种方法，通过验证生产操作期间的严格控制，如表面处理、预处理和电镀/涂层，来检测制造过程中钢零件可能发生的氢脆。 它还旨在用作新电镀/涂层工艺的鉴定测试，以及用于控制电镀/涂层工艺的定期检查审核。 5.2 服务环境- 本试验方法提供了一种方法，用于检测在制造、检修和使用寿命期间由于接触化学品而可能导致的钢零件（电镀/涂层或裸露）氢脆。服务环境中测试的详细信息见 附件A5 .

1.1 This test method describes mechanical test methods and defines acceptance criteria for coating and plating processes that can cause hydrogen embrittlement in steels. Subsequent exposure to chemicals encountered in service environments, such as fluids, cleaning treatments or maintenance chemicals that come in contact with the plated/coated or bare surface of the steel, can also be evaluated. 1.2 This test method is not intended to measure the relative susceptibility of different steels. The relative susceptibility of different materials to hydrogen embrittlement may be determined in accordance with Test Method F1459 and Test Method F1624 . 1.3 This test method specifies the use of air melted SAE 4340 steel (Grade A, see 7.1.1 ) per SAE AMS 6415 (formerly SAE AMS-S-5000 and formerly MIL-S-5000) or an alternative VAR (Vacuum Arc Remelt) SAE 4340 steel (Grade B, see 7.1.1 ) per SAE AMS 6414, and both are heat treated to 260 to 280 ksi (pounds per square inch ×1000) as the baseline. This combination of alloy and heat treat level has been used for many years and a large database has been accumulated in the aerospace industry on its specific response to exposure to a wide variety of maintenance chemicals, or electroplated coatings, or both. Components with ultimate strengths higher than 260 to 280 ksi may not be represented by the baseline. In such cases, the cognizant engineering authority shall determine the need for manufacturing specimens from the specific material and heat treat condition of the component. Deviations from the baseline shall be reported as required by 12.1.2 . The sensitivity to hydrogen embrittlement shall be demonstrated for each lot of specimens as specified in 9.5 . Note 1: Extensive testing has shown that VAR 4340 steel may be used as an alternative to the air melted steel with no loss in sensitivity. 2 Note 2: VAR 4340 also meets the requirements in AMS 6415 and could be used as an alternative to air melt steel by the steel suppliers because AMS 6415 does not specify a melting practice. 1.4 Test procedures and acceptance requirements are specified for seven specimens of different sizes, geometries, and loading configurations. 1.5 Pass/Fail Requirements— For plating/coating processes, specimens must meet or exceed 200 h using a sustained load test (SLT) at the levels shown in Table 3 . 1.5.1 The loading conditions and pass/fail requirements for service environments are specified in Annex A5 . 1.5.2 If approved by the cognizant engineering authority, a quantitative, accelerated ( ≤ 24 h) incremental step-load (ISL) test as defined in Annex A3 may be used as an alternative to SLT. 1.6 This test method is divided into two parts. The first part gives general information concerning requirements for hydrogen embrittlement testing. The second is composed of annexes that give specific requirements for the various loading and specimen configurations covered by this test method (see section 9.1 for a list of types) and the details for testing service environments. 1.7 The values stated in the foot-pound-second (fps) system 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 considered standard. 1.8 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. 1.9 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 ====== 5.1 Plating/coating Processes— This test method provides a means by which to detect possible hydrogen embrittlement of steel parts during manufacture by verifying strict controls during production operations such as surface preparation, pretreatments, and plating/coating. It is also intended to be used as a qualification test for new plating/coating processes and as a periodic inspection audit for the control of a plating/coating process. 5.2 Service Environment— This test method provides a means by which to detect possible hydrogen embrittlement of steel parts (plated/coated or bare) due to contact with chemicals during manufacturing, overhaul and service life. The details of testing in a service environment are found in Annex A5 .