Metal sheet with a ZnAl coating

Patent metadata

Field	Value
Publication number	US-10041162-B2
Application number	US-201414442955-A
Country	US
Kind code	B2
Filing date	Feb 10, 2014
Priority date	Mar 6, 2013
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

The present invention provides a method for manufacturing a metal sheet. In this method, at least one of the following equations is satisfied:

Z
d

+

18
⁢

⁢

ln
⁡

(

Z
d

)

<

8
⁢

⁢

ln
⁡

(

P
V

)

-
27.52

(
A
)

fO
2

<

2.304
·

10

-
3

(

27.52
+

Z
d

+

8
⁢

⁢

ln
⁡

(

V
P

⁢

(

Z
d

)

2.25

)

)

2

(
B
)

wherein:
Z is the distance between the metal sheet and the nozzle along the main ejection direction (E),
Z being expressed in mm,
d is the average height of the outlet of the nozzle along with the running direction of the metal sheet in front of the nozzle, d being expressed in mm,
V is the running speed of the metal sheet in front of the nozzle, V being expressed in m·s −1 ,
P is the pressure of the wiping gas in the nozzle, P being expressed in N·m −2 , and
fO 2 is the volume fraction of oxygen in the wiping gas. A metal sheet, part and land motor vehicle are also provided.

First claim

What is claimed is:

1. A coated metal sheet comprising:
a steel substrate having at least one face; and
a metal coating the at least one face of the substrate, the metal coating being deposited by dipping the steel substrate in a dip bath;
the metal coating comprising between 0.2 and 0.7% by weight of Al, a remainder of the metal coating being Zn and inevitable impurities,
wherein the coated metal sheet was not subjected to a skin pass operation after coating and wherein an outer surface of the metal coating has a waviness Wa 0.8 of less than or equal to 0.35 μm.

2. The coated metal sheet according to claim 1 , wherein the metal coating further includes one or more additional elements selected from the following: Si, Sb, Pb, Ti, Ca, Mn, Sn, La, Ce, Cr, Zr or Bi, a weight content of each additional element in the metal coating being less than 0.3%.

3. The coated metal sheet according to claim 1 , wherein the metal coating has a weight content of aluminum less than or equal to 0.6%.

4. The coated metal sheet according to claim 3 , wherein the metal coating has a weight content of aluminum less than or equal to 0.5%.

5. The coated metal sheet according to claim 2 , wherein the metal coating consists of Al; Zn; the one or more additional elements selected from the following: Si, Sb, Pb, Ti, Ca, Mn, Sn, La, Ce, Cr, Zr or Bi; and inevitable impurities.

Assignees

• Arcelormittal Investig Y Desarrollo S L
• Arcelormittal

Inventors

• Mataigne Jean-Michel
• Dauchelle Didier
• Bertrand Florence

Classifications

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• C21D8/00

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• C21D8/04

  to produce plates or strips for drawing, e.g. for deep-drawing · CPC title

• Y10T428/12229

  Intermediate article [e.g., blank, etc.] · CPC title

• Y10T428/265

  1 mil or less · CPC title