Pharmaceutical
Online are hosting an article by M. Gonzalez on corrosion in pharmaceutical
pipework.
The
introduction to the article reads:
“Chemical
services of any kind may require special alloys for corrosion resistance,
freedom from metal ion contamination, or both. Bioprocessing applications can
have even more stringent requirements, due to the high degree of cleanliness
required to convey sterile and non-sterile products or solutions. Tubing and/or
piping systems, must, therefore meet these requirements in their fabrication,
particularly when it applies to their product or solution contact surfaces.
Stainless steels are uniquely qualified not only because of their long service
life, availability and fabricability, but also because they are non-corroding,
non-contaminant, they can be polished to very smooth finishes, they are strong
and rigid, they can withstand heat and chemical sterilization treatments, and
they are easily welded.
There
are more than 70 standard types of stainless steel and many special alloys.
These steels are produced in the wrought form (AISI - American Iron and Steel
Institute - types) and as cast alloys (ACI - Alloy Casting Institute - types).
Generally, all are iron based, with 12% to 30% chromium, 0% to 22% nickel, and
minor amounts of carbon, columbium, copper, molybdenum, selenium, tantalum, and
titanium.”
Posted by Tim Sandle
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