Method for Producing a Coated Metal Strip Having an Improved Appearance
원문보기
IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
C23C-002/06
B32B-015/01
B32B-015/04
C23C-002/04
B32B-015/20
C23C-002/00
C23C-026/00
C23C-002/26
C23C-030/00
B32B-015/18
출원번호
US-0703930
(2017-09-13)
공개번호
US-0002798
(2018-01-04)
우선권정보
EP-08290450.9 (2008-05-14)
발명자
/ 주소
Mataigne, Jean-Michel
Diez, Luc
출원인 / 주소
Mataigne, Jean-Michel
인용정보
피인용 횟수 :
0인용 특허 :
0
초록▼
A process for manufacturing a coated metal strip having a metallic corrosion protection coating is provided. The process includes passing a metal strip through a molten metal bath comprising from 2 to 8 wt % aluminum, 0 to 5 wt % magnesium, up to 0.3 wt % additional elements, and a balance including
A process for manufacturing a coated metal strip having a metallic corrosion protection coating is provided. The process includes passing a metal strip through a molten metal bath comprising from 2 to 8 wt % aluminum, 0 to 5 wt % magnesium, up to 0.3 wt % additional elements, and a balance including zinc and inevitable impurities, to yield a molten metal coated metal strip, wiping the molten metal coated metal strip with a nozzle spraying a gas on either side of the molten metal coated metal strip and cooling the coating in a controlled manner until the coating has completely solidified, to obtain the coated metal strip. A temperature of the molten metal bath is from 350 to 700° C., and the cooling is conducted at a rate less than 15° C./s between a temperature on leaving a unit where the wiping occurs and a start of solidification of the coating, and then at a rate greater than or equal to 15° C./s between a start and an end of solidification of the coating.
대표청구항▼
1. A process for manufacturing a coated metal strip comprising a metallic corrosion protection coating, the process comprising: passing a metal strip through a molten metal bath comprising from 2 to 8 wt % aluminum, 0 to 5 wt % magnesium, up to 0.3 wt % additional elements, and a balance being zinc
1. A process for manufacturing a coated metal strip comprising a metallic corrosion protection coating, the process comprising: passing a metal strip through a molten metal bath comprising from 2 to 8 wt % aluminum, 0 to 5 wt % magnesium, up to 0.3 wt % additional elements, and a balance being zinc and inevitable impurities, to yield a molten metal coated metal strip;wiping the molten metal coated metal strip with a nozzle spraying a gas on either side of the molten metal coated metal strip; andcooling the coating in a controlled manner until the coating has completely solidified, to obtain the coated metal strip;wherein a temperature of the molten metal bath is from 350 to 700° C., and the cooling is conducted at a rate less than 15° C./s between a temperature on leaving a unit where the wiping occurs and a start of solidification of the coating, and then at a rate greater than or equal to 15° C./s between a start and an end of solidification of the coating. 2. The process of claim 1, wherein the cooling rate is less than 10° C./s between a temperature on leaving a unit where the wiping occurs and a start of solidification of the coating and then greater than or equal to 15° C./s between the start and the end of solidification of the coating. 3. The process of claim 2, wherein the cooling rate is less than 10° C./s between a temperature on leaving a unit where the wiping unit occurs and a start of solidification of the coating, and then greater than or equal to 20° C./s between the start and end of solidification of the coating. 4. The process of claim 1, wherein the coated metal strip is wiped in such a way that a portion of the strip located between a wiping line and finishing at least 10 cm higher is in contact with an atmosphere comprising an oxidizing power lower than that of an atmosphere consisting of 4 vol % oxygen and 96 vol % nitrogen. 5. The process of claim 1, wherein the metal strip is a steel strip. 6. The process of claim 1, wherein an aluminum content of the molten metal bath is greater than 2.0 wt %. 7. The process of claim 1, wherein the molten metal bath comprises from 2.0 wt % to 8.0 wt % aluminum. 8. The process of claim 1, wherein the molten metal bath comprises from 1 to 4 wt % of magnesium. 9. The process of claim 1, wherein the molten metal bath does not comprise any magnesium. 10. The process of claim 1, wherein a waviness Wa0.8 of the coating, after solidification, is 0.5 μm or less. 11. The process of claim 10, further comprising a deformation of the metal strip to form a metal part, and a waviness Wa0.8 of the coating of the metal part is 0.48 μm or less. 12. The process of claim 11, wherein the process does not include skin-passing the metal strip before deformation. 13. The process of claim 11, wherein the process includes skin-passing the metal strip before deformation, and a waviness Wa0.8 of the coating of the metal part is 0.35 μm or less. 14. The process of claim 11, wherein the deformation includes drawing of the metal strip.
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