Conditions for chloride stress corrosion in stainless steel
Thread Content
Stainless steel is at risk of stress corrosion failure in the presence of chloride ions, but this type of corrosion seems to be related to the concentration of chloride ions, temperature, and pressure. What exactly are these relationships? For example, at what chloride ion concentration does corrosion occur? Thank you so much!
At high temperatures, unexpected local concentrations of chloride ions can often occur; therefore, SCC can also arise at low chloride ion concentrations
This topic is great; I want to know too. Please help boost it. Recently, I have also been working on addressing the issue of chloride ions in our hydrogenation feedstocks. This is a serious problem that involves the possibility of replacing the materials used, and it’s really challenging. The heater in one of our medium-sized units is made of stainless steel; it has recently cracked due to corrosion. Tests have shown that the cause was stress corrosion cracking SCC caused by chlorides. We don’t know either if it was caused by an operational error or by the presence of chloride ions in the raw materials. Those who are aware please discuss the question raised by the original poster.
I have a question similar to yours; it relates to the corrosion of stainless steel in low-temperature environments. I think it’s caused by chloride ions, and the cracks are longitudinal in nature. http://bbs.hcbbs.com/thread-458522-1-1.html
Chloride ions cause severe corrosion of stainless steel; stress corrosion is particularly severe, so special attention must be paid to areas such as welds and corners
Only chlorine does not suffer from stress corrosion; the presence of chloride ions is necessary. In other words, it depends on whether the water content is at a certain level and whether there are structures that facilitate the accumulation of chloride ions
I can’t open the image from your post. Why?
Here are the requirements regarding chloride content in stainless steel water supply pipes for your reference. When the chloride content in water is
If I remember correctly, stress corrosion caused by chloride ions needs to be considered when their concentration exceeds 25 ppm.
GB150 stipulates that during the hydrostatic testing of austenitic stainless steel vessels, the chloride content in the water should be kept at no more than 25 mg/L.