Abstract: The present invention provides a steel material, such as a high-strength spring, that has excellent fatigue properties, and, more specifically, a steel material, such as the high-strength spring, that can improve the fatigue properties in a high-strength region more easily, without increasing an alloy cost. The steel material includes, in percent by mass, C: 0.5 to 1.0%, Si: 1.5 to 2.50%, Mn: 0.5 to 1.50%, P: more than 0% to 0.020% or less, S: more than 0% to 0.020% or less, Cr: more than 0% to 0.2% or less, Al: more than 0% to 0.010% or less, N: more than 0% to 0.0070% or less, and O: more than 0% to 0.0040% or less, and the balance consisting of iron and inevitable impurities, wherein Cr and Si contents satisfy a formula of Cr×Si?0.20, a ratio of tempered martensite in a steel microstructure is 80% or more by area, and a number density of particles of Cr-containing carbide or carbonitride having a circle-equivalent diameter of 50 nm or more in the steel microstructure is 0.10 particles/?m2 or less.

Abstract: The present invention provides a steel material, such as a high-strength spring, that has excellent fatigue properties, and, more specifically, a steel material, such as the high-strength spring, that can improve the fatigue properties in a high-strength region more easily, without increasing an alloy cost. The steel material includes, in percent by mass, C: 0.5 to 1.0%, Si: 1.5 to 2.50%, Mn: 0.5 to 1.50%, P: more than 0% to 0.020% or less, S: more than 0% to 0.020% or less, Cr: more than 0% to 0.2% or less, Al: more than 0% to 0.010% or less, N: more than 0% to 0.0070% or less, and O: more than 0% to 0.0040% or less, and the balance consisting of iron and inevitable impurities, wherein Cr and Si contents satisfy a formula of Cr×Si?0.20, a ratio of tempered martensite in a steel microstructure is 80% or more by area, and a number density of particles of Cr-containing carbide or carbonitride having a circle-equivalent diameter of 50 nm or more in the steel microstructure is 0.10 particles/?m2 or less.

Abstract: This high carbon steel wire rod, which has excellent drawability in addition to high strength required for a wire rod, contains 0.6-1.5% of C, 0.1-1.5% of Si, 0.1-1.5% of Mn, 0.02% or less of P (excluding 0%), 0.02% or less of S (excluding 0%), 0.03-0.12% of Ti, 0.001-0.01% of B and 0.001-0.005% of N, with solid-solved B being 0.0002% or more, solid-solved N being 0.0010% or less, and the balance being made up of iron and inevitable impurities. In addition, the content of Ti solid-solved in the steel is 0.002% by mass or more, and the content of Ti that formed carbides is 0.020% by mass or more.

Abstract: A heat-treated steel wire having excellent bendability is provided. The heat-treated steel wire includes, in % by mass: C: 0.5 to 0.8%, Si: 1.5 to 2.5%, Mn: 0.5 to 1.5%, P: more than 0% to 0.02%, S: more than 0% to 0.02%, Cr: 0.3 to less than 0.7%, V: 0.05 to 0.5%, Al: more than 0% to 0.01%, N: more than 0% to 0.007%, and O: more than 0% to 0.004%, and iron. When electrolytic extraction residue analysis is performed using a 1.0 ?m filter and a 0.4 ?m filter, a ratio of [amount of Cr-based carbides in a 1.0 ?m filter residue/amount of an electrolyte] is 1.0% or more and 2.80% or less. When residue analysis of the filtrate obtained by the 1.0 ?m filter is performed, a ratio of [amount of Cr based carbides in a 0.4 ?m filter residue/amount of an electrolyte] is 0.10% or less.

Abstract: To provide a heat-treated steel wire having excellent fatigue-resistance characteristics. The heat-treated steel of the present invention has a predetermined chemical composition, with the balance being iron and inevitable impurities, wherein the heat-treated steel wire includes, in a tempered martensite structure at a depth of 0.3 mm from a surface layer: Cr based carbides having a circle equivalent diameter of 0.1 ?m or more and less than 0.3 ?m in 0.20 particles/?m2 or less, Cr based carbides having a circle equivalent diameter of 0.3 ?m or more and less than 0.7 ?m in 0.002 particles/?m2 or less, and Cr based carbides having a circle equivalent diameter of 0.7 ?m or more in 0.0010 particles/?m2 or less, and wherein the amount of residual austenite exceeds 5% and 15% or less in terms of a volume ratio.

Abstract: To provide a coil spring having excellent fatigue resistance. Disclosed is a coil spring made of steel, including (in % by mass, the same shall apply for a chemical composition): C: 0.40 to 0.70%; Si: 1.50 to 3.50%; Mn: 0.30 to 1.50%; Cr: 0.10 to 1.50%; V: 0.50 to 1.00%, and Al: 0.01% or less (excluding 0%), with the balance being iron and inevitable impurities, wherein an average crystal grain size number of prior austenite crystals in a depth of 0.3 mm from a surface is 11.0 or more, while a difference in grain size number between the respective prior austenite crystals is in a range of less than 3 from a grain size number observed at the maximum frequency, and wherein a carburized layer is provided in a depth of 0.30 to 1.00 mm from the surface, while an average Vickers hardness is 600 or higher at a position in a depth of (¼)×diameter in the depth direction from the surface.

Abstract: Provided is a high-carbon steel wire which gives steel wires having high strength and has excellent suitability for wiredrawing and which after being wiredrawn, has excellent fatigue properties. The high-carbon steel wire has an adequately regulated chemical composition and has a pearlite structure in an areal proportion of 90% or more. In 2,000 ?m2 of the pearlite structure, the number of BN compound grains having an equivalent-circle diameter of 100 nm or more but less than 1,000 nm is 100 or less (including 0) and the number of BN compound grains having an equivalent-circle diameter of 1,000 nm or more is 10 or less (including 0).

Abstract: This high carbon steel wire rod, which has excellent drawability in addition to high strength required for a wire rod, contains 0.6-1.5% of C, 0.1-1.5% of Si, 0.1-1.5% of Mn, 0.02% or less of P (excluding 0%), 0.02% or less of S (excluding 0%), 0.03-0.12% of Ti, 0.001-0.01% of B and 0.001-0.005% of N, with solid-solved B being 0.0002% or more, solid-solved N being 0.0010% or less, and the balance being made up of iron and inevitable impurities. In addition, the content of Ti solid-solved in the steel is 0.002% by mass or more, and the content of Ti that formed carbides is 0.020% by mass or more.

Abstract: Provided is a high-carbon steel wire which gives steel wires having high strength and has excellent suitability for wiredrawing and which after being wiredrawn, has excellent fatigue properties. The high-carbon steel wire has an adequately regulated chemical composition and has a pearlite structure in an areal proportion of 90% or more. In 2,000 ?m2 of the pearlite structure, the number of BN compound grains having an equivalent-circle diameter of 100 nm or more but less than 1,000 nm is 100 or less (including 0) and the number of BN compound grains having an equivalent-circle diameter of 1,000 nm or more is 10 or less (including 0).

Abstract: A parts supplying apparatus for use with a button assembling and setting machine includes a chute having a longitudinal guide track in and along which parts slide down one at a time, and a loading unit having a guide groove communicating with the guide track and a pusher disposed in the guide groove and slidably movable toward and away from a working station in the machine for feeding a part which has fallen from the guide track into the guide groove, in and along the latter to the working station. The chute has an exhaust nozzle disposed adjacent to a discharge end of the guide track and opening in such a direction that compressed air issued from the nozzle impinges against the underside of the part to force the latter to move smoothly from the guide track to the guide groove without stopping at a junction therebetween.

Abstract: An apparatus for attaching a pair of fastener elements onto a garment fabric comprising a cooperating pair of an upper die unit and a lower die unit, a stationary anvil mounted in the lower unit, a plunger reciprocably mounted in the upper unit, a punch movable relative to the plunger along a path of movement toward and away from the lower unit, and a pair of clamping jaws operatively associated with the upper die unit for releasably clamping one of the fastener elements. A means is provided for holding one fastener element in proper position against displacement for aligned engagement with the other mating element. The apparatus further includes means for manually releasing the fastener element which has been trapped in the event of failure of the apparatus.

Abstract: A method and apparatus for forming space sections in a continuous length slide fastener chain in which the interlocking elements fastened on the carrier tapes within the section are pressed and deformed with a punch-die unit having a composite punch composed of an outer punch and an inner punch and the thus deformed elements are retained by the punch-die unit in engagement with a pair of grooves on the upper surface of the die and lower surface of the inner punch while the carrier tapes are pulled and displaced by individual grippers from the front of the punch-die unit in an obliquely rearward direction, preferably, at such an angle that the angle between the moving line of the gripper and the center line of the punch-die unit is about a half of the tape-abstracting angle whereby all of the elements within the section can be removed from the carrier tape with a uniform abstracting angle.