Steel sheet for containers, and method for producing steel sheet for containers

A steel sheet for containers comprising:

• a steel sheet;
• a Sn coated layer that is formed on at least one surface of the steel sheet;
• and
• a chemical treatment layer that is formed on the Sn coated layer,
• wherein the Sn coated layer contains 300 mg/m2 to 5,600 mg/m2 of Sn in terms of an amount of metal Sn,
• the chemical treatment layer contains 5 mg/m2 to 30 mg/m2 of a Zr hydrated oxide compound in terms of an amount of metal Zr,
• the chemical treatment layer is formed by performing a cathode electrolytic treatment in a chemical treatment liquid that contains a Zr ion and a F ion,
• an average roughness Ra of an outermost surface of the chemical treatment layer obtained with a scanning probe microscope is 10 nm to 100 nm,
• a variation amount in a yellowness index measured at one measurement point on the outermost surface of the chemical treatment layer is defined as ΔYI represented by Equation (1), and
• an average of absolute values of the ΔYI obtained at the arbitrary 20 measurement points per 1 m2 of the outermost surface is 5.0 or less,
• ΔYI=YI−YI0 (1)
• where
• YI:
• yellowness index measured after the steel sheet for containers is subjected to a retort treatment at a temperature of 130° C. for 5 hours,
• YI0:
• yellowness index measured before the retort treatment.