HOME FAQs BOOKS JOBS: Help Wanted Suggestions you are here: Hotline/Forum => Letter 52073
Wrinkle defect in galvanized steel sheet
Dear All ;
I am an metallurgical and materials engineer and working in sheet steel factory in Turkey.
As shown in the picture ; there is a wrinkle defect (mark) in our galvanized sheet steels and we do not know the root reason of this problem.
We have a continuous galvanizing lines and we could not find any problem about process parameters (tensions, atmosphere and furnace temperatures are normal). Could you have any idea about this surface problem.
Regard
engineer - Bursa, Turkey
^- Privately contact this inquirer -^
April 1, 2010
Dear Mr. Kirma,
What is the thickness and width of the material? What is the hardness?
I have seen this wrinkle marks before. It happened on thin strip
0.30mm thick and 0.30mm wide.
It also appeared on 0.20 mm thick and 914 mm wide. Both material is CQ (soft)
The wrinkle marks appeared after the strip exits the molten zinc.
we were using crowned sink roll. After removing the radial crown on the sink roll, the problem disappeared.
Hope the info helps
Voo
- Karachi, Pakistan