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Letter 31072
Corrosion issue with 5120 and 1010 steels
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We have a heat treating customer that uses one of our metal
cleaner/corrosion inhibitors to remove quench oils from their heat
treated, steel parts. (Quench oil is floated and skimmed so it can be
recycled) one Part is made from sintered 1010 steel. Another part is
made from forged 5120 steel. Hardness on these steels is RC 58-60.
Both parts are then tempered and grit blasted with SG50 steel
grit. (Grit blaster has a dust collector) the 5120 parts are coated
with an oil rust preventative.
Problem, within one week the parts are returned because they have
rusted. Even the oiled parts. Other types of steel are processed as
above with no issues. Other parts made of the same type of steels are
processed with no issues.
We are looking for possible causes at our customer's facility for
the corrosion on the above mentioned parts. It is puzzling as other
parts made from a wide variety of steels including those mentioned
are processed the same way with the same equipment with no corrosion
issues at all.
Tom Hager
Industrial chemical compounder - Grand Rapids, MI, USA
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