Claims
- 1. A ferrous base ferritic strip continuously hot dip coated with a coating metal prepared by a process comprising:
- cleaning the ferritic strip, the base metal of said cleaned strip comprising at least about 6% by
- weight chromium and less than about 3% by weight nickel, heating said cleaned strip to a temperature near or slightly above the
- melting point of said coating metal,
- maintaining said cleaned strip in a protective atmosphere of at least about 95% by volume hydrogen having a dew point of no more than +40.degree. F. (+4.degree. C.) and containing no more than about 200 ppm oxygen,
- dipping said cleaned strip into a molten bath of said coating metal, which is selected from the group consisting of aluminum and aluminum alloy, to deposit a coating layer on at least one side of said cleaned strip and said coating layer formed without a thick brittle Fe-Al alloy inner layer,
- said coating layer being substantially free of uncoated areas, tightly adherent, and resistant to crazing and flaking during bending of said continuous ferritic chromium alloy strip.
- 2. The strip as set forth in claim 1 wherein said base metal includes at least about 10% by weight chromium.
- 3. The strips et forth in claim 2 wherein said base metal includes substantially 0% by weight nickel.
- 4. The strip as set forth in claim 3 wherein said base metal includes 10.0-14.5% by weight chromium, 0.1-1.0% by weight silicon, and 0.2-0.5% by weight titanium.
Parent Case Info
This application is a continuation of application Ser. No. 016,920, filed Feb. 20, 1987, now issued as U.S. Pat. No. 4,800,135 which is a division of application Ser. No. 865,238, filed May 20, 1986, now issued as U.S. Pat. No. 4,675,214.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4601999 |
Retallick et al. |
Jul 1986 |
|
4675214 |
Kilbane et al. |
Jun 1987 |
|
4800135 |
Kilbane et al. |
Jan 1989 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
245727 |
Dec 1985 |
JPX |
153255 |
Jun 1988 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
865238 |
May 1986 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
16920 |
Feb 1987 |
|