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cleaning stainless nuts & bolts

A client cold forms stainless nuts and bolts using National Machinery
equipment.  The nuts & bolts are made from 3" to 15/8" 304 & 316 SS rod.
The rod is continously fed first through either an induction or resistance
heater to roughly 900F and then into the header or nut former. 

Machining oils in the header and nut formers are scalded on the nuts and
bolts and the company is looking for a means to clean and brighten them.
>From a root cause perspective, the shop manager says that the cold forming
equipment cannot run on water-based coolants.  The company has experimented
with various aqueous cleaners and has had no luck.  They have tried tumbling
with ceramic media but the cleaning is poor and the parts are still dull.

They are trying to stay away from a nitric acid brightening process.  Does
anyone have experience with cleaning cold formed stainless?  Any suggestions
on other (harder) media to tumble with or other P2 approaches?


Timothy J. Greiner, MBA
Greiner Environmental
47R Englewood Rd.
Gloucester, MA  01930

tel:  978-525-2214
fax:  978-525-2247