Is there a risk of hydrogen embrittlement in high-pressure hydrogen storage cylinders?
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I would like to consult experts: for a hydrogen storage vessel made of material 4130X, with a pressure rating of 20 MPa, designed for temperatures ranging from -40 to 93°C and operating at normal temperature, is there any possibility of failure due to hydrogen embrittlement? Additionally, which parts of the bottle and tubing are most prone to failure?
Does the bottle body need chemical treatment? Looking forward to experts' answers
I recommend the standard GB/T30579-2014; page 43 provides a detailed explanation of the mechanism of hydrogen embrittlement and how to avoid it. For a device like the one described by the original poster, there is still a high likelihood of hydrogen embrittlement damage occurring. Hydrogen embrittlement occurs preferentially in areas with high hardness and strength. From the perspective of container manufacturing, if production is carried out in accordance with TSG21-2016, it is advisable to apply heat treatment, while also avoiding the temperature range associated with temper brittleness. It is also recommended to apply a coating to the inner wall to prevent direct contact between hydrogen and the material.
1. Both 30579 and API are qualitative descriptions； 2. Whether this can actually occur still requires reference to relevant domestic research; from what I’ve found, hydrogen embrittlement is a possibility ； 3. Currently, it is still difficult to detect hydrogen embrittlement
Hello, the poster. It is not recommended to use a material like 4130x; this type of material is sensitive to hydrogen in high-pressure hydrogen environments. You can refer to the test report prepared by the China Special Equipment Inspection and Research Institute for Air Liquide. Such a material can only be used at pressures below 39 MPa
Below 103 Mpa, these materials can be used; ASME per code case