A tin coated steel sheet is provided for manufacturing a drawn can having: a thickness inferior to 0.7 mm, a yield strength inferior to 400 MPa, an average grain aspect ratio below 1.5, a strain hardening coefficient below 1.5, a tin coating from 0.5 to 4.0 g.Math.m.sup.2 on a first face and from 2.8 to 11.2 g.Math.m.sup.2 on a second face, a chemical composition comprising in weight percent 0.002C0.09 and 0.0015B0.005 and a balance of Fe and unavoidable impurities, and the steel sheet having a ferritic microstructure with a mean grain size from 5 to 15 m.

Provided is a process for producing a tinned copper wire. The process comprises subjecting a copper wire sequentially to activation treatment, a first hot tinning treatment, a first cooling, a second hot tinning treatment, and a second cooling to obtain a tinned copper wire. The first hot tinning treatment is carried out at a first temperature and the second hot tinning treatment is carried out at a second temperature. The first temperature is higher than the second temperature. The first temperature is at least 38 C. higher than the melting point of tin. The second temperature is at least 8 C. higher than the melting point of tin.

A lead-free solder preform includes a core layer and adhesion layer coated over surfaces of the core layer, where the preform delivers the combined merits from constituent solder alloys of the core and adhesion layers to provide both high temperature performance and improved wetting in high-temperature solder applications such as die attach. The core layer may be formed of a Bi Alloy having a solidus temperature above 260 C., and the adhesion layer may be formed of Sn, a Sn alloy, a Bi alloy, In, or an In alloy having a solidus temperature below 245 C. The solder preform may be formed using techniques such as: (1) electroplating a core ribbon with an adhesion material, (2) cladding an adhesion material foil onto a core ribbon, and/or (3) dipping a core ribbon in a molten adhesion alloy bath to allow thin layers of adhesion material to adhere to a core ribbon.

The present invention provides a titanium copper foil having improved adhesion to solder and higher resistance to discoloration due to a high temperature and high humidity environment, an acid solution or an alkaline solution, and as well as having improved etching processability. The present invention provides a titanium copper foil comprising a base metal, the base metal having a composition containing Ti of from 1.5 to 5.0% by mass, the balance being copper and inevitable impurities, and having a thickness of from 0.018 to 0.1 mm, wherein the titanium copper foil has an Sn plated layer on a surface of the base metal, and has an adhesive strength of 0.5 N or more as measured by a solder adhesive strength test according to the definition in the specification.

The present invention provides a titanium copper foil having improved adhesion to solder and higher resistance to discoloration due to a high temperature and high humidity environment, an acid solution or an alkaline solution, and as well as having improved etching processability. The present invention provides a titanium copper foil comprising a base metal, the base metal having a composition containing Ti of from 1.5 to 5.0% by mass, the balance being copper and inevitable impurities, and having a thickness of from 0.018 to 0.1 mm, wherein the titanium copper foil has an Sn plated layer on a surface of the base metal, and has an adhesive strength of 0.5 N or more as measured by a solder adhesive strength test according to the definition in the specification.

A steel sheet for containers includes a steel sheet, an underlying Ni layer formed by performing a Ni coating or a FeNi alloy coating containing Ni in an amount of 5 mg/m.sup.2 to 150 mg/m.sup.2 in terms of an amount of metal Ni on at least one surface of the steel sheet, a Sn coated layer formed by performing a Sn coating containing Sn in an amount of 300 mg/m.sup.2 to 3,000 mg/m.sup.2 in terms of an amount of metal Sn on the underlying Ni layer and including an island-shaped Sn formed by alloying the Sn coating and at least a part of the underlying Ni layer by a reflow treatment, an oxide layer formed on the Sn coated layer and containing tin oxide, and a chemical treatment layer formed on the oxide layer and at least contains Zr in an amount of 1 mg/m.sup.2 to 500 mg/m.sup.2 in terms of an amount of metal Zr and phosphate acid in an amount of 0.1 mg/m.sup.2 to 100 mg/m.sup.2 in terms of an amount of P, in which the oxide layer contains tin oxide in such an amount that an amount of electricity required for reduction of the oxide layer is 0.3 mC/cm.sup.2 to 10 mC/cm.sup.2.

A steel sheet for containers includes a steel sheet, an underlying Ni layer formed by performing a Ni coating or a FeNi alloy coating containing Ni in an amount of 5 mg/m.sup.2 to 150 mg/m.sup.2 in terms of an amount of metal Ni on at least one surface of the steel sheet, a Sn coated layer formed by performing a Sn coating containing Sn in an amount of 300 mg/m.sup.2 to 3,000 mg/m.sup.2 in terms of an amount of metal Sn on the underlying Ni layer and including an island-shaped Sn formed by alloying the Sn coating and at least a part of the underlying Ni layer by a reflow treatment, an oxide layer formed on the Sn coated layer and containing tin oxide, and a chemical treatment layer formed on the oxide layer and at least contains Zr in an amount of 1 mg/m.sup.2 to 500 mg/m.sup.2 in terms of an amount of metal Zr and phosphate acid in an amount of 0.1 mg/m.sup.2 to 100 mg/m.sup.2 in terms of an amount of P, in which the oxide layer contains tin oxide in such an amount that an amount of electricity required for reduction of the oxide layer is 0.3 mC/cm.sup.2 to 10 mC/cm.sup.2.

Provided is a chemical treatment steel sheet including a steel sheet; a composite coated layer which is formed on at least one surface of the steel sheet, and contains 2 to 200 mg/m.sup.2 of Ni in terms of an amount of metal Ni and 0.1 to 10 g/m.sup.2 of Sn in terms of an amount of metal Sn, and in which an island-shaped Sn coated layer is formed on an FeNiSn alloy layer; and a chemical treatment layer that is formed on the composite coated layer, and contains a 0.01 to 0.1 mg/m.sup.2 of Zr compounds in terms of an amount of metal Zr and 0.01 to 5 mg/m.sup.2 of phosphate compounds in terms of an amount of P.

Provided is a chemical treatment steel sheet including a steel sheet; a composite coated layer which is formed on at least one surface of the steel sheet, and contains 2 to 200 mg/m.sup.2 of Ni in terms of an amount of metal Ni and 0.1 to 10 g/m.sup.2 of Sn in terms of an amount of metal Sn, and in which an island-shaped Sn coated layer is formed on an FeNiSn alloy layer; and a chemical treatment layer that is formed on the composite coated layer, and contains a 0.01 to 0.1 mg/m.sup.2 of Zr compounds in terms of an amount of metal Zr and 0.01 to 5 mg/m.sup.2 of phosphate compounds in terms of an amount of P.

A chemical treatment steel sheet includes a steel sheet; a FeSn alloy layer which is formed on at least one surface of the steel sheet; an Sn layer which is formed on the FeSn alloy layer; and a chemical treatment layer that is formed on the Sn layer, and contains a 0.01 to 0.1 mg/m.sup.2 of Zr compounds in terms of an amount of metal Zr and 0.01 to 5 mg/m.sup.2 of phosphate compounds in terms of an amount of P. The total Sn content of the FeSn alloy layer and the Sn layer is 0.1 to 15 g/m.sup.2 of Sn in terms of the amount of metal Sn.