Summary for pin rust on crca Discussion
Pin rust on CRCA product is the central issue in this thread: one poster says CRCA coils look clean after the ECL (electrolytic cleaning line) but show pin-type rust after batch annealing and at the skin pass mill, while another reports pin rust appearing after degreasing and asks whether it is a CRCA manufacturer process mistake. The thread excerpt does not include any replies or diagnosis, so no definitive cause is given. The practical takeaway is that the rust is being observed after cleaning, but the source could be upstream contamination, inadequate cleaning, or another process-related issue that would need further investigation. Because there are no answer posts in the excerpt, no named expert advice can be attributed.
Q. These CRCA Coils are getting rusted after ECL Line (Electrolytic Cleaning Line). Not able to observe on this line but after batch annealing pin type rust is observed at Skin Pass Mill.
My concern is that even after Cleaning why this pin type of rust is created on steel sheet?
Ravi Dashottar
Product designer – Karnataka, India
August 14, 2008
Q. We find that after de greasing of CRCA sheet, surface is full of pin rust. Is this a process mistake by CRCA manufacturer? If YES, what and in which process?
SANJEEV
SANJEEV AGARWAL
– LUCKNOW UP INDIA
August 17, 2017