A steel sheet for containers including 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. A variation amount in a yellowness index measured at one measurement point on the outermost surface of the chemical treatment layer is defined as YI, and represented by YI=YIYI.sub.0, wherein YI is the yellowness index measured after the steel sheet for containers is subjected to a retort treatment at a temperature of 130 C. for 5 hours, and YI.sub.0 is the yellowness index measured before the retort treatment. An average of absolute values of the YI obtained at a plurality of measurement points included in a unit area of the outermost surface is 5.0 or less.

A method for plating a stainless steel substrate is provided. According to one embodiment, the method comprises sandblasting at least one joint surface of a stainless steel substrate and treating the joint surface of the stainless steel substrate with an aqueous solution (acid bath) which contains sulfuric acid, nitric acid and hydrofluoric acid. The stainless steel substrate is then rinsed with hydrochloric acid. The method further includes galvanic deposition of a nickel plating on the joining surface of the stainless steel substrate and the subsequent deposition of a tin layer on the nickel-coated joining surface of the stainless steel substrate.

The Cu core ball contains a Cu ball and one or more metal layer for covering a surface of the Cu ball, each layer including one or more element selected from Ni, Co, Fe and Pd. The Cu ball contains at least one element selected from Fe, Ag, and Ni in a total amount of 5.0 or more to 50.0 ppm by mass or lower, S in an amount of 0 ppm by mass or more to 1.0 ppm by mass or lower, P in an amount of 0 ppm by mass or more to less than 3.0 ppm by mass, and remainder of Cu and inevitable impurities. The Cu ball contains purity which is 99.995% by mass or higher and 99.9995% or lower, sphericity which is 0.95 or higher and a diameter of 1 m or more to 1000 m or lower.

Steel sheet for cans high in strength and excellent in formability and appearance comprising C: 0.0010 to 0.0035%, Si: 0.050% or less, Mn: 0.10 to 0.50%, P: 0.040% or less, S: 0.040% or less, Al: less than 0.005%, N: 0.0050% or less and a balance of Fe and unavoidable impurities, wherein an average value of a ratio of length of crystal grains in a sheet thickness direction to length in a sheet width direction is 0.70 or more, a yield strength is 500 MPa or more, and, in a range of 0 to 90 of the rolling direction, a minimum value of an r-value is 1.50 or more, an average value of the r-value is 1.70 or more, and a difference of the maximum value and minimum value of the r-value is 0.50 or less.

A steel sheet for a container includes: a steel sheet; a coated layer containing Ni provided as an upper layer of the steel sheet; and a chemical treatment layer as an upper layer of the coated layer, and containing a Zr compound in an amount of 3.0 to 30.0 mg/m.sup.2 in terms of Zr metal, and a Mg compound in an amount of 0.50 to 5.00 mg/m.sup.2 in terms of Mg metal, in which the coated layer is one of: a Ni coated layer which contains Ni in amount of 10 to 1000 mg/m.sup.2 in terms of Ni metal, and a composite coated layer which contains Ni in an amount of 5 to 150 mg/m.sup.2 in terms of Ni metal and Sn in an amount of 300 to 3000 mg/m.sup.2 in terms of Sn metal, and has an island-shaped Sn coated layer formed on an FeNiSn alloy layer.

A wire material for a canted coil spring includes a core wire composed of a steel having a pearlite structure, a copper plating layer covering the outer peripheral surface of the core wire, the copper plating layer being composed of copper or a copper alloy, and a hard layer disposed adjacent to the outer periphery of the copper plating layer, the hard layer having a higher hardness than the copper plating layer. The steel constituting the core wire contains 0.5% or more by mass and 1.0% or less by mass carbon, 0.1% or more by mass and 2.5% or less by mass silicon, and 0.3% or more by mass and 0.9% or less by mass manganese, the balance being iron and unavoidable impurities.

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.sup.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.sup.2 in terms of Zr metal and a Mg compound in an amount of 0.50 to 5.00 mg/m.sup.2 in terms of Mg metal.

A steel sheet for a drawn can has a predetermined chemical composition and has a ferrite single-phase structure with a crystal grain size number of 11.0 or more, the sheet thickness is 0.15 to 0.50 mm, in an L direction of the steel sheet after an ageing treatment at 100 C. for one hour, an yield strength YP is 220 to 290 MPa, a tensile strength TS is 330 to 390 MPa, a total elongation EL is 32% or more, an yield point elongation YP-EL is 0%, an average plastic strain ratio r.sub.m is more than 1.35, and an in-plane anisotropy r is 0.30 to +0.15.

The Cu core ball contains a Cu ball and one or more metal layer for covering a surface of the Cu ball, each layer including one or more element selected from Ni, Co, Fe and Pd. The Cu ball contains at least one element selected from Fe, Ag, and Ni in a total amount of 5.0 or more to 50.0 ppm by mass or lower, S in an amount of 0 ppm by mass or more to 1.0 ppm by mass or lower, P in an amount of 0 ppm by mass or more to less than 3.0 ppm by mass, and remainder of Cu and inevitable impurities. The Cu ball contains purity which is 99.995% by mass or higher and 99.9995% or lower, sphericity which is 0.95 or higher and a diameter of 1 m or more to 1000 m or lower.

A slide member is provided with a base material and a slide layer. The slide layer is disposed on at least a portion of the base material. The slide layer contains a solid lubricant and a plurality of hard particles, the hard particles being harder than the solid lubricant.