The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 2014
Filed:
Jul. 14, 2011
Applicants:
Wayne Renshaw, Unanderra, AU;
Qiyang Liu, Mount Keira, AU;
Inventors:
Wayne Renshaw, Unanderra, AU;
Qiyang Liu, Mount Keira, AU;
Assignee:
Bluescope Steel Limited, Melbourne, Victoria, AU;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C23C 2/04 (2006.01); C23C 2/06 (2006.01); C23C 2/12 (2006.01); C23C 2/40 (2006.01); B05D 1/18 (2006.01); C23C 2/02 (2006.01);
U.S. Cl.
CPC ...
C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/04 (2013.01); B05D 1/18 (2013.01); C23C 2/12 (2013.01); C23C 2/40 (2013.01);
Abstract
A method of controlling 'rough coating' and 'pinhole-uncoated' surface defects on a steel strip coated with a aluminum-zinc-silicon alloy. The alloy has 50-60% wt Al, 37-46% wt Zn and 1.2-2.3% wt Si. The method includes heat treating the steel strip in a heat treatment furnace and thereafter hot-dip coating the strip in a molten bath and thereby forming a coating of the alloy on the steel strip. The method is characterized by controlling the concentration of (i) strontium or (ii) calcium or (iii) strontium and calcium in the molten bath to be at least 2 ppm.