本标准描述了一种评估无涂层冷轧和热轧超高强度钢（UHSS）氢脆敏感性的试验方法。可以评估的材料的厚度范围受到将材料弯曲和应变到本规范中规定应力水平的能力的限制。 任何抗拉强度大于或等于980MPa的钢都可能发生氢脆。一些钢的微观结构，特别是那些具有残余奥氏体的微观结构在某些条件下可能在较低的拉伸强度下敏感。可用氢的存在，加上高强度钢制造的零件中的高应力水平，是氢脆的必要前兆。 由于发生氢脆所需的特定条件，本试验中的开裂并不表明由该材料制成的零件会在汽车环境中开裂。在选择任何UHSS时，应结合材料的应变状态和零件的操作环境来考虑该试验的结果。由于这种测试方法是比较性的，如果对已知性能的对照样品与所研究的材料一起进行评估，可以获得最多的信息。

This standard describes a test method for evaluating the susceptibility of uncoated cold rolled and hot rolled Ultra High Strength Steels (UHSS) to hydrogen embrittlement. The thickness range of materials that can be evaluated is limited by the ability to bend and strain the material to the specified stress level in this specification. Hydrogen embrittlement can occur with any steel with a tensile strength greater than or equal to 980 MPa. Some steel microstructures, especially those with retained austenite, may be susceptible at lower tensile strengths under certain conditions. The presence of available hydrogen, combined with high stress levels in a part manufactured from high strength steel, are necessary precursors for hydrogen embrittlement. Due to the specific conditions that need to be present for hydrogen embrittlement to occur, cracking in this test does not indicate that parts made from that material would crack in an automotive environment. Results from this test should be considered in conjunction with the strain state of the material and the operating environment of the part when selecting any UHSS. Since this test method is comparative, the most information can be gained if a control sample of known performance is evaluated along with the material being studied.