Highly formable automotive aluminum sheet with reduced or no surface roping and a method of preparation

Patent metadata

Field	Value
Publication number	US-9828652-B2
Application number	US-201614993653-A
Country	US
Kind code	B2
Filing date	Jan 12, 2016
Priority date	Jan 12, 2015
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

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.

First claim

What is claimed is:

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, wherein the aluminum alloy comprises a yield strength of at least 100 MPa when the aluminum alloy is in a T4 temper.

2. The aluminum alloy of claim 1 , comprising about 0.60-0.95 wt. % Si, 0.20-0.35 wt. % Fe, 0.05-0.20 wt. % Cu, 0.05-0.20 wt. % Mn, 0.55-0.75 wt. % Mg, 0.0-0.15 wt. % Cr, 0.0-0.006 wt. % Ni, 0.0-0.15 wt. % Zn, 0.0-0.15 wt. % Ti, up to 0.15 wt. % impurities, with the remainder as Al.

3. A motor vehicle body part comprising 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, wherein the aluminum alloy comprises a yield strength of at least 100 MPa when the aluminum alloy is in a T4 temper.

4. The motor vehicle body part of claim 3 , wherein the motor vehicle body part comprises an outer panel.

5. 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, wherein the aluminum alloy comprises a yield strength of at least 100 MPa when the aluminum alloy is in a T6 temper.

6. The aluminum alloy of claim 5 , comprising about 0.60-0.95 wt. % Si, 0.20-0.35 wt. % Fe, 0.05-0.20 wt. % Cu, 0.05-0.20 wt. % Mn, 0.55-0.75 wt. % Mg, 0.0-0.15 wt. % Cr, 0.0-0.006 wt. % Ni, 0.0-0.15 wt. % Zn, 0.0-0.15 wt. % Ti, up to 0.15 wt. % impurities, with the remainder as Al.

7. A motor vehicle body part comprising 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, wherein the aluminum alloy comprises a yield strength of at least 100 MPa when the aluminum alloy is in a T6 temper.

8. The motor vehicle body part of claim 7 , wherein the motor vehicle body part comprises an outer panel.

Assignees

• Novelis Inc

Inventors

• Kamat Rajeev G
• Custers David
• Gupta Alok
• Despois Aude

Classifications

• C22F1/047

  of alloys with magnesium as the next major constituent · CPC title

• C22F1/043

  of alloys with silicon as the next major constituent · CPC title

• C22C21/08 Primary

  with silicon · CPC title

• C22C21/02 Primary

  with silicon as the next major constituent · CPC title

• C21D9/46 Primary

  for sheet metals · CPC title