Claims
- 1. A steel sheet having a zinc coating on one side and a uniformly Fe-Zn alloyed layer on the other side, said alloyed layer being present in an amount corresponding to 0.001 g/m.sup.2 to 1 g/m.sup.2 of Zn and containing from about 6 to 20 percent by weight iron.
- 2. The steel sheet of claim 1 wherein the surface roughness of the alloyed layer is not larger than 10 .mu.Hmax.
- 3. The steel sheet of claim 1 wherein the Fe-Zn alloy is selected from the group consisting of zeta, delta.sub.1 and gamma iron-zinc alloys.
- 4. A steel sheet having a uniformly alloyed Fe-Zn coating on each side, the alloy layer on one side of said sheet having been removed so as to leave an alloy layer on said one side corresponding to 0.001 g/m.sup.2 to 1 g/m.sup.2 of Zn and containing from about 6 to 20 percent by weight iron.
- 5. The steel sheet of claim 4 wherein the surface roughness of said one side is not larger than 10 .mu.Hmax.
- 6. The steel sheet of claim 4 wherein the alloy is selected from the group consisting of zeta, delta.sub.1 and gamma iron-zinc alloys.
Priority Claims (3)
Number |
Date |
Country |
Kind |
51/57611 |
May 1976 |
JPX |
|
51/136076 |
Nov 1976 |
JPX |
|
52/31725 |
Mar 1977 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 797,737, filed May 17, 1977.
US Referenced Citations (6)
Divisions (1)
|
Number |
Date |
Country |
Parent |
797737 |
May 1977 |
|