Hydrogen embrittlement or hydrogen corrosion
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There is a operating condition in which the hydrogen content is around 10%, while the limit value is 60%; the other components are mainly water, ammonia, and similar substances. The operating pressure is 0.5 MPa and the temperature is 145°C. It involves a reactive distillation tower made of 304 stainless steel. Under these conditions, hydrogen may have an impact on the material of the tower, potentially causing issues such as hydrogen embrittlement or hydrogen corrosion All marine enthusiasts are welcome to discuss.
Under these operating conditions, although the hydrogen content reaches 10%, hydrogen embrittlement is unlikely to occur since 304 stainless steel has good corrosion resistance. Hydrogen embrittlement is usually more pronounced under high stress and in environments with high levels of sulfides, and the corrosion resistance of stainless steel can effectively slow down this process. However, prolonged high temperatures and a certain hydrogen pressure may lead to hydrogen corrosion or hydrogen-induced cracking. It is recommended to regularly check the integrity of the equipment and conduct material tests to ensure safe operation. .
With this temperature, this pressure, and this concentration, how can there be hydrogen corrosion?
Hello, how should I interpret this graph? Please give some guidance. Thank you
According to the NELSON curve, hydrogen corrosion need not be considered below 200°C; even under high-temperature conditions, austenitic stainless steels are resistant to hydrogen corrosion.
How do I read the pressure at the top and bottom and the temperature on the left and right in this graph? Seeking advice
The horizontal axis represents temperature; the unit on the right side is degrees Celsius, while the unit on the left side is degrees Fahrenheit. The vertical axis represents the hydrogen partial pressure, calculated as a percentage of hydrogen times the design pressure; the unit on the top is MPa, and the unit on the bottom is psi. Check this against your operating conditions to see if it’s appropriate