A clad material includes a first layer made of stainless steel and a second layer made of Cu or a Cu alloy and roll-bonded to the first layer. In the clad material, a grain size of the second layer measured by a comparison method of JIS H 0501 is 0.150 mm or less.

A steel material for oil country tubular goods that has a high strength and excellent SSC resistance is provided. The steel material according to this invention contains, in mass %, C: more than 0.45 to 0.65%, Si: 0.10 to 1.0%, Mn: 0.1 to 1.0%, P: 0.050% or less, S: 0.010% or less, Al: 0.01 to 0.1%, N: 0.01% or less, Cr: 0.1 to 2.5%, Mo: 0.25 to 5.0%, and Co: 0.05 to 5.0%, and satisfies expressions (1) and (2), and contains 90% or more of tempered martensite by volume ratio:

C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15Co/6+0.70(1)

(3C+Mo+3Co)/(3Mn+Cr)1.0(2)

Effective B=B11(NTi/3.4)/14(3) where, in expression (1) is 0.250 when effective B (mass %) defined by expression (3) is 0.0003% or more, and is 0 when effective B is less than 0.0003%.

An alloy includes: steel; manganese; aluminum; and silicon in an amount such that the alloy has an electrical conductivity from 2% IACS to 6% IACS measured in accordance with ASTM E1004-09 (2009).

A laminate includes: an insulating substrate; an intermediate layer formed on a surface of the substrate and containing a metal or an alloy as a main component; and a metal film formed of a copper powder having a hydrogen content of 0.002% by mass or less and laminated on the intermediate layer. An interface between the intermediate layer and the metal film is plastically deformed.

Provide is a metal-coated liquid-crystal polymer film that is suitable for microcircuit processing and capable of reducing the transmission loss of circuits. The metal-coated liquid-crystal polymer film comprising: a polymer film comprising a polymer film main body capable of forming an optically anisotropic melt phase; a first metal layer layered on at least one side of the polymer film main body; and a second metal layer layered on the first metal layer, wherein in an analysis of oxygen concentration in a thickness direction using XPS, the average oxygen concentration of the first metal layer is 2.5 atom % or less.

Provided is a sliding material including a substrate; and a copper alloy layer bonded to the substrate. The copper alloy includes 2.0 to 15.0% by mass of tin. The copper alloy layer includes a sliding body part including a sliding surface, and a gradient region including a bond surface with the substrate. A tin concentration in the gradient region reduces from the sliding body part toward the bond surface. A method for producing the siding material is also provided. The method includes preparing the substrate having a first surface and a second surface opposite to the first surface; melting the copper alloy; casting the molten copper alloy on the first surface of the substrate; and solidifying the copper alloy unidirectionally by cooling the substrate from the second surface by a coolant.

This surface-treated copper foil is characterized in that the amount of adhesion of Si on the copper foil surface is from 3.1 to 300 g/dm.sup.2, and the amount of adhesion of N on the copper foil surface is from 2.5 to 690 g/dm.sup.2. The objective of the present invention is to obtain a copper foil having improved peel strength in providing a copper foil for a flexible printed substrate (FPC), in which a copper foil is laminated to a liquid crystal polymer (LCP) suitable for high-frequency applications.

A galvannealed steel sheet includes a plating layer containing 7.2-10.6 mass % of Fe, 0.2-0.4 mass % of Al, and 0.1 mass % or more of at least one of Ni, Co, Cu, and In, and the balance of Zn and impurities. In a vertical cross-section of the plating layer, an average thickness of a phase is 0.2 m or less, and an average thickness of a phase is 0.5 m or less. In the phase, at least one of Ni, Co, Cu, and In are contained at a ratio in the phase of 0.5 mass % or more. A phase existing in contact with the phase is a mixed phase of .sub.1 phase and phase, and a phase percentage defined by ( phase/ phase contact interface length)/( phase/ phase contact interface length+.sub.1 phase/ phase contact interface length)100 is 10% or more.

A plated steel sheet (1) includes: a steel sheet (2); a pre-plating layer (3) on at least one surface of the steel sheet (2), the pre-plating layer (3) containing Al, Cu, In, Zn, Sn, or Sb, or any combination thereof; and a plating layer (4) of a ZnNi alloy on the pre-plating layer (3), a Ni content of the ZnNi alloy being 5 mass % to 15 mass %. A coating weight of the pre-plating layer (3) is 0.5 g/m.sup.2 or more, and a coating weight of the plating layer (4) is 5 g/m.sup.2 or more.

Provided is a method of manufacturing a zinc-plated steel sheet. The method includes: coating a metal on the steel sheet on a steel sheet; annealing the metal coated steel sheet; and zinc plating the annealed steel sheet by dipping in a molten zinc plating bath. Further provided is a method of manufacturing a hot-press part including: coating a metal on the steel sheet on a steel sheet; annealing the metal coated steel sheet; zinc plating the annealed steel sheet by dipping in a molten zinc plating bath; heating the zinc-plated steel sheet; and press forming the heated steel sheet.