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Post treatment of steel after quenching process

August 8, 2021

Q. We have two stage cleaning after quenching process. 1st stage is alkali dip & spray and 2nd stage is hot water spray. Problem point is that, after hot water spray stains/marks observed on parts. We use DM water with temperature 70 °C for hot water spray process. Someone please suggest me which parameter I need to change in DM water so that we get parts with no marks.

Karthik Acharya
- Bangalore Karnataka India
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August 2021

A. Hi Karthik. Hopefully someone who is also working with this problem will understand it better, but it's a bit vague for me. What are you quenching in -- some sort of oil? Why must you alkaline clean and rinse? What kind of marks do you get -- salt-like stains, black discolorations, rust? Can isopropyl alcohol be added to the DI water for better sheeting action? Is vapor degreasing/vapor drying a viable alternative? What are the aesthetic standards? Thanks.

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey
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August 15, 2021

Q. Dear sir, thank you so much for your reply.
We use high temp X oil in quenching process. Since oil content is more on parts we perform alkali dip and rinse process and in order to remove alkali content from part we use hot water spray. But currently we are getting black marks on parts after hot water spray (will share a photo soon).
I tried skipping hot water spray, but alkali burn marks observed in tempering process hence hot water spray is necessary for me.

Karthik Acharya [returning]
- Bangalore Karnataka India
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