Claims
- 1. A process for forming a drawn and ironed container from flat sheet steel comprising,
- electroplating a nickel-zinc alloy coating of substantially uniform thickness to both sides of a sheet or strip of flat rolled steel of a gauge suitable for drawing and ironing, wherein the thickness of the nickel-zinc alloy coating on both sides of the base metal is within the range of about 0.5 to about 5.0 microinches, said coating containing zinc in the amount of about 2 to 12 percent by weight with the remainder being nickel and impurities,
- drawing the nickel-zinc coated steel into a cup having sidewall and bottom wall thicknesses substantially equal to the thickness of the coated steel, and
- ironing the sidewalls of the drawn cup to reduce the sidewall thickness and increase the height to produce a drawn and ironed can body.
- 2. The process of claim 2 wherein the thickness of the nickel-zinc alloy coating on both sides of the base metal is within the range of about 1.0 to about 3.0 microinches.
- 3. The process according to claim 3, further comprising the step of passing the nickel-zinc alloy electroplated steel through a chemical bath consisting of a dichromate or chromic acid solution prior to the drawing step.
- 4. The process according to claim 3 further comprising the step of applying a lubricating oil to said chemically treated surfaces prior to drawing said nickel-zinc coated steel into a cup.
- 5. The process according to claim 1 wherein the amount of zinc in said coating is within the range of about 5.0 to about 10.0 percent by weight.
- 6. The process of claim 5 wherein the thickness of the nickel-zinc coating on both sides of the base metal is within the range of about 1.0 to about 3.0 microinches.
- 7. The process according to claim 6 wherein the flat rolled steel is blackplate.
- 8. The process according to claim 7 further comprising the step of applying an organic lacquer coating to at least the inner surface of said drawn and ironed can body.
Parent Case Info
This is a division, of application Ser. No. 233,569, filed Feb. 11, 1981, U.S. Pat. No. 4,374,902.
US Referenced Citations (14)
Foreign Referenced Citations (1)
Number |
Date |
Country |
3005159 |
Aug 1980 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Plating, vol. 39, No. 9, pp. 1033-1037, Sep. 1952. |
Divisions (1)
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Number |
Date |
Country |
Parent |
233569 |
Feb 1981 |
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