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Black stripe on cleaned and annealed cold rolled coils

(-----) October 6, 2021

Q. GETTING BLACK SURFACE IN COLD ROLLED STRIPS / PROCESS ELECTROLYTIC CLEANING THEN ANNEALING

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JAGDISH MISHRA
- SAMBALPUR ORISSA INDIA
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October 2021

A. Hi Jagdish. We don't have much info upon which to hazard a guess yet, but it looks to me like oil/grease was getting onto that one particular area on the strip, and burning on and blackening up during annealing.

Luck & Regards,

Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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