Hydrogen Embrittlement Testing of Ultra High Strength Steels and Stampings by Acid Immersion
This standard describes a test method for evaluating the susceptibility of 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 the specification. Hydrogen embrittlement can occur with any steel with a tensile strength greater than about 1000 MPa, although some steel microstructures, especially those with retained austenite, may be susceptible at lower tensile strengths under the right conditions. The presence of available hydrogen, high stress levels and materials of high strength are considered the most at risk 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.