Abstract: A cyanide-free gold electroplating solution for forming gold deposits contains bismuth and compact-packed via-filling deposit with a U-shaped stacked structure in cross section inside drilled holes. A gold electroplating solution includes 15 g/L of gold (I) sodium sulfite (as gold element), 15 g/L of sodium sulfate, 50 g/L of sodium sulfite, 10 mg/L of thallium formate (as thallium element), 50 mg/L of bismuth nitrate (as bismuth element) and 1 g/L of sodium phosphate.

Abstract: The present invention relates to a metal powder including 0.1?C?0.4 mass %, 0.005?Si?1.5 mass %, 0.3?Mn?8.0 mass %, 2.0?Cr?15.0 mass %, 2.0?Ni?10.0 mass %, 0.1?Mo?3.0 mass %, 0.1?V?2.0 mass %, 0.010?N?0.200 mass %, and 0.01?Al?4.0 mass %, with the balance being Fe and unavoidable impurities, and satisfying the following expression (1), 10<15[C]+[Mn]+0.5[Cr]+[Ni]<20 (1), in which [C], [Mn], [Cr] and [Ni] respectively represent the contents of C, Mn, Cr and Ni by mass %.

Abstract: The present invention relates to a metal powder containing: 0.001 mass %?C?0.45 mass %, 0.01 mass %?Si?3.50 mass %, Mn?2.0 mass %, 7.5 mass %?Cr?21.0 mass %, 1.5 mass %?Ni?7.0 mass %, Mo?1.3 mass %, 0.05 mass %?V?2.0 mass %, Al?0.015 mass %, and N?0.20 mass %, with the balance being Fe and unavoidable impurities, satisfying 0.05 mass %?C+N?0.58 mass %, and satisfying: 10<15C+Mn+0.5Cr+Ni<20 and Creq/Nieq<5.6, where Creq=Cr+Mo+1.5Si+0.5Nb, and Nieq=Ni+30C+30N+0.5Mn.

Abstract: The present invention relates to an Fe-based alloy having a composition including 0.5 mass %?C?0.9 mass %, 0.5 mass %?Si?3.0 mass %, 0.1 mass %?Mn?1.0 mass %, 3.0 mass %?Cr?8.0 mass %, and 0.1 mass %?Mo?4.0 mass %, with the balance being Fe and unavoidable impurities, and satisfying the following expression (1) when [M] represents a content of an element M expressed in mass % basis, ?3.0<[Si]?(5[C]+2[Mn])<?0.5 (1).

Abstract: The present invention relates to a metal powder including 0.1?C?0.4 mass %, 0.005?Si?1.5 mass %, 0.3?Mn?8.0 mass %, 2.0?Cr?15.0 mass %, 2.0?Ni?10.0 mass %, 0.1?Mo?3.0 mass %, 0.1?V?2.0 mass %, 0.010?N?0.200 mass %, and 0.01?Al?4.0 mass %, with the balance being Fe and unavoidable impurities, and satisfying the following expression (1), 10<15[C]+[Mn]+0.5[Cr]+[Ni]<20 (1), in which [C], [Mn], [Cr] and [Ni] respectively represent the contents of C, Mn, Cr and Ni by mass %.

Abstract: A steel for use in high strength pinion shaft which is not refined and used by applying high frequency hardening, with less occurrence of peeling during hobbing, having high surface hardness, impact value and torsional strength after high frequency hardening, and with less heat treatment strains during high frequency hardening, containing, on the mass % basis; C: 0.45-0.55%, Si: 0.10-0.50%, Mn: 0.50-1.20%, P: 0.025% or less, S: 0.025% or less, Mo: 0.15-0.25%, B: 0.0005-0.005%, Ti: 0.005-0.10%, and N: 0.015% or less, satisfying: 0.80?Ceq 0.95 and f value?1.0, and the balance of Fe and inevitable impurities, as well as a manufacturing method thereof.

Abstract: Disclosed is a non-heat treated steel for hot forging, particularly suitable for producing connecting rods of automobile engines. The steel consists essentially of: by weight, C: 0.3-0.8%, Si: 0.1-2.0%, Mn: 0.3-1.5%, P: 0.01-0.15%, Cr: 0-1.0%, V: 0-0.4%, Al: 0-0.05%, N: 0.005-0.03% and the balance being Fe and inevitable impurities, provided that the contents of C, Mn and Cr fulfill the following condition: 1.40[C %]+0.28[Mn %]+0.50[Cr %]?0.75 Pearlite area fraction in this steel after hot forging is 50% or more. Notches are provided with laser beam on an intermediate part at the location from which fracture starts, and load is applied. Then, the intermediate is split to be two components (big end or cap and small end/rod for connecting rod). The components are adhered to form the parts.

Abstract: The invention provides a hot-working die steel for die-casting obtainable by quenching a steel comprising, in terms of % by mass, C: 0.1 to 0.3%, Si: 0.1 to 1.5%, Mn: 0.3 to 2%, Cr: 6 to 12%, P: 0.05% or less, S: 0.01% or less, Mo: 1 to 3%, V: 0.5 to 1.5%, s-Al: 0.005 to 0.025%, N: 0.005 to 0.025%, and O: 0.005% or less, with the remainder being Fe and inevitable impurities, followed by tempering the steel at a temperature of 500° C. or lower.

Abstract: A mechanical component 1 composed of a steel is surface-hardened by nitriding, and specifically has a surficial layer 2 raised in the surface hardness by the nitriding, and an inner portion 3 not affected by the nitriding and showing a nearly constant hardness. Vickers hardness of the inner portion 3 is adjusted to 190 to 260 HV, Vickers hardness of the surficial portion 2 measured at a reference position corresponded to a 50 ?m depth from the component surface is adjusted to 340 to 460 HV, and effective depth of hardened layer measured from the component surface 4, where a Vickers hardness of 270 HV is achieved, is adjusted to 0.3 mm or more. This makes it possible to provide a mechanical component which is composed of a steel and surface-hardened by nitriding, and is successfully improved in the strength and bending straightening property, and also to provide a method of fabricating the same.

Abstract: A steel for use in high strength pinion shaft which is not refined and used by applying high frequency hardening with less occurrence of peeling during hobbing, having high surface hardness, impact value and torsional strength after high frequency hardening, and with less heat treatment strains during high frequency hardening, containing, on the mass % basis; C; 0.45-0.55%, Si: 0.10-0.50%, MA: 0.50-1.20%, P: 0.025% or less, S: 0.025% or less, Mo: 0.15-0.25%, B: 0.0005-0.005%, Ti: 0.005-0.10%, and N: 0.015% or less, satisfying; 0.80≦Ceq 0.95 and f value≦1.0, and the balance of Fe and inevitable impurities, as well as a manufacturing method thereof.

Abstract: A microalloyed steel easy to separate by fracture splitting at low temperatures, which comprises from 0.15 to 0.35 wt % carbon, from 0.5 to 2.0 wt % silicon, from 0.5 to 1.5 wt % manganese, from 0.03 to 0.15 wt % phosphorus, from 0.01 to 0.15 wt % sulfur, from 0.01 to 0.5 wt % copper, from 0.01 to 0.5 wt % nickel, from 0.01 to 1.0 wt % chromium, from 0.001 to 0.01 wt % soluble aluminium, from 0.005 to 0.035 wt % nitrogen, from 0.001 to 0.01 wt % calcium, and from 0.001 to 0.01 wt % oxyge ough separation by fracture splitting at a low temperature, e.g., a connecting rod for engines.

Abstract: Disclosed is a non-heat treated steel for soft niriding, which can provide forged parts exhibiting equal to or larger than the limit strain at which cracks occur in straightening by bending and equal to or larger than the fatigue strength when compared with the parts of conventional heat treated steel, such as S48C. The non-heat treated steel for soft nitriding consists essentially of, by weight, C: 0.2-0.6%, Si: 0.05-1.0%, Mn: 0.25-1.0%, S: 0.03-0.2%, Cr: up to 0.2%, sol-Al: up to 0.045%, Ti: 0.002-0.01%, N: 0.005-0.025%, and O: 0.001-0.005%; provided that the conditions, 0.12[Ti%]<[O%]<2.5[Ti%] and 0.04[N%]<[O%]<0.75[N%], are met; the balance being Fe and inevitable impurities; and the structure after hot forging being a mixed structure of ferrite and pearlite.

Abstract: Disclosed is a non-heat treated steel for hot forging, particularly suitable for producing connecting rods of automobile engines. The steel consists essentially of; by weight, C: 0.3-0.8%, Si: 0.1-2.0%, Mn: 0.3-1.5%, P: 0.01-0.15%, Cr: 0-1.0%, V: 0-0.4%, Al: 0-0.05%, N: 0.005-0.03% and the balance being Fe and inevitable impurities, provided that the contents of C, Mn and Cr fulfill the following condition: 1.40[C %]+0.28[Mn %1]+0.50[Cr %]≧0.75 Pearlite area fraction in this steel after hot forging is 50% or more. Notches are provided with laser beam on an intermediate part at the location from which fracture starts, and load is applied. Then, the intermediate is split to be two components (big end or cap and small end/rod for connecting rod). The components are adhered to form the parts.

Abstract: Disclosed is a non-heat treated steel for soft niriding, which can provide forged parts exhibiting equal to or larger than the limit strain at which cracks occur in straightening by bending and equal to or larger than the fatigue strength when compared with the parts of conventional heat treated steel, such as S48C. The non-heat treated steel for soft nitriding consists essentially of, by weight, C: 0.2-0.6%, Si: 0.05-1.0%, Mn: 0.25-1.0%, S: 0.03-0.2%, Cr: up to 0.2%, sol-Al: up to 0.045%, Ti: 0.002-0.01%, N: 0.005-0.025%, and O: 0.001-0.