Steel sheet for container and method for producing steel sheet for container

Patent metadata

Field	Value
Publication number	US-10563311-B2
Application number	US-201615562805-A
Country	US
Kind code	B2
Filing date	Apr 15, 2016
Priority date	Apr 16, 2015
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

A steel sheet for a container includes a steel sheet, a Sn coated layer which is provided as an upper layer of the steel sheet and contains Sn in an amount of 560 to 5600 mg/m2 in terms of Sn metal, and a chemical treatment layer which is provided as an upper layer of the Sn coated layer and contains a Zr compound in an amount of 3.0 to 30.0 mg/m2 in terms of Zr metal and a Mg compound in an amount of 0.50 to 5.00 mg/m2 in terms of Mg metal.

First claim

The invention claimed is:

1. A steel sheet for a container, comprising:
a steel sheet;
a Sn coated layer which is provided as an upper layer of the steel sheet and contains Sn in an amount of 560 to 5600 mg/m 2 in terms of Sn metal; and
a chemical treatment layer which is provided as an upper layer of the Sn coated layer and consists of
(a) a Zr compound in an amount of 3.0 to 30.0 mg/m 2 in terms of Zr metal, and
(b) a Mg compound in an amount of 0.50 to 5.00 mg/m 2 in terms of Mg metal, and
(c) unavoidable impurities,
and optionally further consists of (d) one or more selected from a group consisting of a phosphoric acid and a phosphate.

2. The steel sheet for a container according to claim 1 ,
wherein a total amount of one or more selected from a group consisting of a phosphoric acid and a phosphate is 1.5 to 25.0 mg/m 2 in terms of P.

3. The steel sheet for a container according to claim 1 ,
wherein the Sn coated layer further contains a Fe—Sn alloy.

4. The steel sheet for a container according to claim 3 ,
wherein a total amount of one or more selected from a group consisting of a phosphoric acid and a phosphate is 1.5 to 25.0 mg/m 2 in terms of P.

5. A method for producing a steel sheet for a container, the method comprising:
coating so as to form a Sn coated layer which contains Sn in an amount of 560 to 5600 mg/m 2 in terms of Sn metal on a steel sheet;
after the coating, chemical treating so as to form a chemical treatment layer on the Sn coated layer by a cathode electrolysis treatment using a chemical treatment solution containing 100 to 3000 ppm of Zr ions, 120 to 4000 ppm of F ions, and 50 to 300 ppm of Mg ions; and
after the chemical treating, main-washing a steel sheet on which the Sn coated layer and the chemical treatment layer are formed using a water at a temperature of 40° C. or higher for 0.5 seconds or longer.

6. The method for producing a steel sheet for a container according to claim 5 , the method further comprising:
alloying at least some amount of Sn in the Sn coated layer with at least some amount of Fe in a steel sheet through performing a reflow treatment on a steel sheet on which the Sn coated layer is formed.

7. The method for producing a steel sheet for a container according to claim 6 ,
wherein the chemical treatment solution further includes 2000 ppm or less of phosphate ions.

8. The method for producing a steel sheet for a container according to claim 7 ,
wherein the chemical treatment solution further includes nitrate ions and ammonium ions having a total amount of 20000 ppm or less.

9. The method for producing a steel sheet for a container according to claim 8 , the method further comprising:
before the main-washing, preliminary-washing a steel sheet on which the Sn coated layer and the chemical treatment layer are formed using a water at a temperature of 10° C. or higher and lower than 40° C. for 0.5 seconds or longer.

10. The method for producing a steel sheet for a container according to claim 7 , the method further comprising:
before the main-washing, preliminary-washing a steel sheet on which the Sn coated layer and the chemical treatment layer are formed using a water at a temperature of 10° C. or higher and lower than 40° C. for 0.5 seconds or longer.

11. The method for producing a steel sheet for a container according to claim 6 ,
wherein the chemical treatment solution further includes nitrate ions and ammonium ions having a total amount of 20000 ppm or less.

12. The method for producing a steel sheet for a container according to claim 11 , the method further comprising:
before the main-washing, preliminary-washing a steel sheet on which the Sn coated layer and the chemical treatment layer are formed using a water at a temperature of 10° C. or higher and lower than 40° C. for 0.5 seconds or longer.

13. The method for producing a steel sheet for a container according to claim 6 , the method further comprising:
before the main-washing, preliminary-washing a steel sheet on which the Sn coated layer and the chemical treatment layer are formed using a water at a temperature of 10° C. or higher and lower than 40° C. for 0.5 seconds or longer.

14. The method for producing a steel sheet for a container according to claim 5 ,
wherein the chemical treatment solution further includes 2000 ppm or less of phosphate ions.

15. The method for producing a steel sheet for a container according to claim 14 ,
wherein the chemical treatment solution further includes nitrate ions and ammonium ions having a total amount of 20000 ppm or less.

16. The method for producing a steel sheet for a container according to claim 15 , the method further comprising:
before the main-washing, preliminary-washing a steel sheet on which the Sn coated layer and the chemical treatment layer are formed using a water at a temperature of 10° C. or higher and lower than 40° C. for 0.5 seconds or longer.

17. The method for producing a steel sheet for a container according to claim 14 , the method further comprising:
before the main-washing, preliminary-washing a steel sheet on which the Sn coated layer and the chemical treatment layer are formed using a water at a temperature of 10° C. or higher and lower than 40° C. for 0.5 seconds or longer.

18. The method for producing a steel sheet for a container according to claim 5 ,
wherein the chemical treatment solution further includes nitrate ions and ammonium ions having a total amount of 20000 ppm or less.

19. The method for producing a steel sheet for a container according to claim 18 , the method further comprising:
before the main-washing, preliminary-washing a steel sheet on which the Sn coated layer and the chemical treatment layer are formed using a water at a temperature of 10° C. or higher and lower than 40° C. for 0.5 seconds or longer.

20. The method for producing a steel sheet for a container according to claim 5 , the method further comprising:
before the main-washing, preliminary-washing a steel sheet on which the Sn coated layer and the chemical treatment layer are formed using a water at a temperature of 10° C. or higher and lower than 40° C. for 0.5 seconds or longer.

Assignees

• Nippon Steel Corp

Inventors

• Tachiki Akira
• Hirano Shigeru
• Tani Yoshiaki
• Yokoya Hirokazu
• Yanagihara Morio
• Kawabata Makoto

Classifications

• C23C28/34 Primary

  including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates · CPC title

• Y10T428/12931

  Co-, Fe-, or Ni-base components, alternative to each other · CPC title

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title

• B32B15/043

  of metal (B32B15/01 takes precedence) · CPC title

• B32B2255/28

  Multiple coating on one surface · CPC title