Can carbon steel bolts be used with stainless steel flanges?
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Dear experts: I have a question – can carbon steel blackened bolts be used with stainless steel flanges? Some people say it’s possible, while others say it’s not. The reason given for the prohibition is that stainless steel flanges can lead to carburization, but there seems to be no **standards or written evidence available to support this claim, leaving things confusing. . . . . .
For some processes where the pressure is not very high, such as those involving production wastewater streams, this method can be used; it seems to be quite common these days
This is mainly determined by the type of substance flowing within the pipeline and the pressure it is subjected to
It works! High-strength carbon steel flange:)
It still has to do with industrial and mining applications; electrochemical corrosion can occur between different materials. However, it depends on the specific industrial or mining environment as well as the medium involved. Such applications are feasible in dry areas with little rainfall, but not in wet and acidic environments
Yes, generally any bolt that meets the requirements will do. Carbon steel bolts are usually used; actually, carbon steel flanges don’t use them either – alloy bolts are used instead, it’s just that stainless steel bolts aren’t utilized
The black ones are probably 35CrMo bolts. . . . . . . . . . . . . . . . . . . . .
It’s probably related to the usage environment; in cases of severe corrosion, it’s better to use stainless steel, otherwise it will be difficult to disassemble and it won’t last long.
Bolts (galvanized + PTFE-coated) can be used; this is what we usually specify in our catalogs
Cheap stainless steel bolts are not of good quality; applying too much force when installing them can easily damage the threads. Once the threads are damaged, the screw has to be cut off using a hacksaw. (It’s also possible that our company is using inferior ones.)
It can be used; this is extremely common in factories these days. Nowadays, people hardly consider whether it might rust or corrode in the future – there’s no sense of responsibility at all