Steel sheet for container and method for producing steel sheet for container
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/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 contains a Zr compound in an amount of 3.0 to 30.0 mg/m 2 in terms of Zr metal and a Mg compound in an amount of 0.50 to 5.00 mg/m 2 in terms of Mg metal.
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.