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。还可以评估在使用环境中遇到的化学品的后续暴露情况，如与钢的镀层/涂层或裸露表面接触的流体、清洁处理或维护化学品。 1.2 本试验方法并非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易感性 F1459 和试验方法 F1624 . 1.3 本试验方法规定了空气熔融SAE 4340钢（A级，参见 7.1.1 )根据SAE AMS 6415（以前的SAE AMS-S-5000和以前的MIL-S-5000）或替代VAR（真空电弧重熔）SAE 4340钢（B级，参见 7.1.1 )根据SAE AMS 6414，并且两者都被热处理至260至280 ksi（磅/平方英寸×1000）作为基线。 这种合金和热处理水平的结合已经使用了多年，航空航天行业已经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特定反应。极限强度高于260至280千磅/平方英寸的部件可能无法用基线表示。在这种情况下，认可的工程机构应确定是否需要根据部件的特定材料和热处理条件制造试样。与基线的偏差应按照 12.1.2 .应证明每批试样对氢脆的敏感性，如 9.5 . 注1: 广泛的测试表明，VAR 4340钢可以用作空气熔化钢的替代品，而不会损失灵敏度。 2. 注2: VAR 4340也符合AMS 6415的要求，并且可以被钢供应商用作空气熔化钢的替代品，因为AMS 6415没有规定熔化实践。 1.4 规定了不同尺寸、几何形状和荷载配置的七个试样的试验程序和验收要求。 1.5 合格/不合格要求-- 对于电镀/涂层工艺，试样必须达到或超过200小时，并在中所示的水平上进行持续载荷试验（SLT） 表3 . 1.5.1 中规定了服务环境的加载条件和通过/失败要求 附件A5 . 1.5.2 如果获得认可的工程主管部门的批准( ≤ 24 h）增量阶跃载荷（ISL）试验，如 附件A3 可以用作SLT的替代方案。 1.6 此测试方法分为两部分。第一部分给出了有关氢脆试验要求的一般信息。第二部分由附件组成，这些附件对本试验方法所涵盖的各种载荷和试样配置提出了具体要求（见第节 9.1 用于类型列表）以及用于测试服务环境的详细信息。 1.7 英尺-磅-秒（fps）系统中以英寸-磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.8 本标准并不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。 1.9 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====== 5.1 电镀/涂层工艺-- 该试验方法提供了一种方法，通过验证表面处理、预处理和电镀/涂层等生产操作过程中的严格控制，来检测制造过程中钢零件可能发生的氢脆。它还用于新电镀/涂层工艺的资格测试，以及电镀/涂层过程控制的定期检查审计。 5.2 服务环境-- 该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，由于接触化学物质，钢部件（镀层/涂层或裸露）可能发生的氢脆。有关在服务环境中进行测试的详细信息，请参阅 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 .