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 of pretinning a guidewire core made of shape memory alloy and having an elongate axis, comprising: placing a ball of solder in a pocket in a soldering block; melting the ball of solder; holding a guidewire core over the ball of solder; lowering the guidewire core into the ball of solder; removing the guidewire from the ball of solder.

A method of pretinning a guidewire core made of shape memory alloy and having an elongate axis, comprising: placing a ball of solder in a pocket in a soldering block; melting the ball of solder; holding a guidewire core over the ball of solder; lowering the guidewire core into the ball of solder; removing the guidewire from the ball of solder.

A chemical treatment steel sheet includes a steel sheet, an FeSn alloy layer which is formed on at least one surface of the steel sheet, a Sn layer which is formed on the FeSn alloy layer and contains Sn in which a total amount of Sn contained in the FeSn alloy layer and the Sn layer is 0.10 to 30.0 g/m.sup.2, and a chemical treatment layer which is formed on the Sn layer and contains a Zr compound in which an amount of Zr contained therein is 1.0 to 150 mg/m.sup.2, a phosphate compound in an amount of P contained therein is 1.0 to 100 mg/m.sup.2 and an Al compound in an amount of Al contained therein is 0.10 to 30.0 mg/m.sup.2.

A chemical treatment steel sheet includes a steel sheet, an FeSn alloy layer which is formed on at least one surface of the steel sheet, a Sn layer which is formed on the FeSn alloy layer and contains Sn in which a total amount of Sn contained in the FeSn alloy layer and the Sn layer is 0.10 to 30.0 g/m.sup.2, and a chemical treatment layer which is formed on the Sn layer and contains a Zr compound in which an amount of Zr contained therein is 1.0 to 150 mg/m.sup.2, a phosphate compound in an amount of P contained therein is 1.0 to 100 mg/m.sup.2 and an Al compound in an amount of Al contained therein is 0.10 to 30.0 mg/m.sup.2.

A manufacturing method of a metal-coated glass fiber according to the present invention includes: drawing a glass fiber from a bushing nozzle of a glass melting furnace; discharging, from an orifice of a metal melting furnace in which a metal for forming a metal coating layer is melted, a molten metal in a dome shape or substantially spherical shape; and bringing the glass fiber into contact with the molten metal, wherein the metal melting furnace has on a wall surface thereof two orifices to discharge two droplets of the molten metal such that end portions of the two droplets abut or overlap each other to define a recess therebetween, and wherein the metal coating layer is formed on the glass fiber by passing the glass fiber downward through the recess and bringing the glass fiber into contact with both of the two droplets.

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 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 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 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.