14-07-2016 дата публикации
Номер: US20160201158A1
Принадлежит:
Novelis Inc.
Disclosed are novel processes to increase productivity on a continuous anneal and solution heat treatment line for heat-treatable automotive aluminum sheet products with high T4 and after-paint bake strengths and reduced roping. As a non-limiting example, the processes described herein can be used in the automotive industry. The disclosed heat treatable alloys and processes also may be applicable to the marine, aerospace, and transportation industries. 1. An aluminum alloy comprising about 0.20-1.0 wt. % Si , 0.11-0.40 wt. % Fe , 0.0-0.23 wt. % Cu , 0.0-0.22 wt. % Mn , 0.50-0.83 wt. % Mg , 0.0-0.25 wt. % Cr , 0.0-0.006 wt. % Ni , 0.0-0.15 wt. % Zn , 0.0-0.17 wt. % Ti , up to 0.15 wt. % impurities , with the remainder as Al.2. The aluminum alloy of claim 1 , comprising about 0.60-0.95 wt. % Si claim 1 , 0.20-0.35 wt. % Fe claim 1 , 0.05-0.20 wt. % Cu claim 1 , 0.05-0.20 wt. % Mn claim 1 , 0.55-0.75 wt. % Mg claim 1 , 0.0-0.15 wt. % Cr claim 1 , 0.0-0.006 wt. % Ni claim 1 , 0.0-0.15 wt. % Zn claim 1 , 0.0-0.15 wt. % Ti claim 1 , up to 0.15 wt. % impurities claim 1 , with the remainder as Al.3. A motor vehicle body part comprising the aluminum alloy of .4. The motor vehicle body part of claim 3 , wherein the motor vehicle body part comprises an outer panel.5. A method of producing a 6xxx series aluminum sheet claim 3 , comprising:casting a 6xxx series aluminum alloy to form an ingot;homogenizing the ingot;hot rolling the ingot to produce a hot rolled intermediate product;cold rolling the hot rolled intermediate product;annealing;cold rolling; andsubjecting the sheet to a continuous anneal and solution heat treatment process.6. A method of producing a 6xxx series aluminum sheet claim 3 , comprising:casting a 6xxx series aluminum alloy to form an ingot;homogenizing the ingot; a) after exit temperature coiling, immediately placing into an anneal furnace, or', 'b) after exit temperature coiling, cooling to room temperature and then placing into an anneal furnace;, 'hot ...
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