Ehart4130.
It is difficult to have both operations, that is carbon steel and stainless steel, under the same roof. Not only for the direct contamination by grinding, equipment, tools, clothing, etc., but also the airborne iron.
There is a lot of practical literature out there for preventative measures to avoid iron contamination of stainless steel. Here is one example:
http://www.bssa.org.uk/topics.php?article=55
As you well noted, the processes can also produce contamination. For example, if the grinder disk used on carbon steel, is used to clean passes on the stainless steel weld, it will be a matter of a few days in a dry climate before the rust starts bleeding out of the weld. Even post weld cleaning will not save those welds.
Instead, there are various pastes on the market that can be used to remove surface contamination.
Those shops that do not practice prevention, have some major rework expenses.
If I run across some down to earth practical stuff, I will send you the links.
Tanks.
Alexa
