Abstract: A high strength steel strand for PC of a wire material having a pearlite structure and containing 0.80 to 1.30% of C, 0.60 to 2.50% of Si and 0.30 to 1.50% of Mn, remainder being Fe and unavoidable impurities, wherein a cementite portion of the wire material comprises a mixed structure of fibrous cementite and granular cementite, the volumetric proportion of the granular cementite to the total cementite is 10 to 40%, the particle diameter of the granular cementite is 40 to 300.ANG., and the strand has a tensile strength of 235 kgf/mm.sup.2 or higher and an elongation of 3.5% or greater.

Abstract: The present process comprising the steps of:(1) heating a steel wire to a temperature which is within the range of approximately 850.degree. C. to about 1050.degree. C. for a period of at least about 2 seconds; wherein said steel wire is comprised of a microalloyed high carbon steel which consists essentially of about 97.03 to about 98.925 weight percent iron, from about 0.72 to about 0.92 weight percent carbon, from about 0.3 to about 0.8 weight percent manganese, from about 0.05 to about 0.4 weight percent silicon, and from about 0.005 to about 0.85 weight percent of at least one member selected from the group consisting of chromium, vanadium, nickel, and boron, with the proviso that the total amount of silicon, manganese, chromium, vanadium, nickel, and boron in the microalloyed high carbon steel is within the range of about 0.7 to 0.9 weight percent;(2) continuously cooling the steel wire at a cooling rate of less than 100.degree. C.

Abstract: A process for the manufacture of a scraper or brush wire with increased wear resistance, in which a rolled steel wire with a carbon content of approximately 0.6 to 0.7% and a diameter of approximately 6 mm and smaller is brought to a final diameter by at least one drawing process, where the wire is patented prior to the drawing or in between successive drawing processes, and after the drawing is heat-treated, and where a steel wire alloyed with a chromium content of 0.3% or smaller is used.

Abstract: This invention provides bainite wire rod and wire excellent in drawability and methods of producing the same.The bainite wire rod or wire is characterized in that it contains, in weight percent, C : 0.90-1.10%, Si : not more than 0.40% and Mn : not more than 0.50%, if required contains Cr : 0.10-0.30%., and is limited to Al : not more than 0.003%, P : not more than 0.02% and S : not more than 0.01%, the remainder being Fe and unavoidable impurities, and has tensile strength and reduction of area determined by the following equations (1) and (2),TS.ltoreq.85.times.(C)+60 (1)RA.gtoreq.-0.875.times.(TS)+158 (2)whereC : carbon content (wt %),TS : tensile strength (kgf/mm.sup.2), andRA : reduction of area (%).

Abstract: This invention provides bainite wire rod and wire excellent in drawability and methods of producing the same.The bainite wire rod or wire is characterized in that it contains, in weight percent, C: 0.80-0.90%, Si: 0.10-1.50% and Mn: 0.10-1.00%, if required contains Cr: 0.10-1.00%, and is limited to P: not more than 0.02%, S: not more than 0.01% and A1: not more than 0.003%, the remainder being Fe and unavoidable impurities, and has tensile strength and reduction of area determined by the following equations (1) and (2),TS.ltoreq.85.times.(C)+60 (1)RA.gtoreq.-0.875.times.(TS)+158 (2)whereC: carbon content (wt%),TS: tensile strength (kgf/mm.sup.2), andRA: reduction of area (%).

Abstract: This invention provides bainite wire rod and wire excellent in drawability and methods of producing the same.The bainite wire rod or wire is characterized in that it contains, in weight percent, C: 0.70-1.20%, Mn: 0.30-0.90% and Si: 0.15-1.00%, further contains as alloying components one or both of Al: 0.006-0.100% and Ti: 0.01-0.35%, if required contains Cr: 0.10-0.50%, and is limited to P: not more than 0.02% and S: not more than 0.01%, the remainder being Fe and unavoidable impurities, and has tensile strength and reduction of area determined by the following equations (1) and (2),TS.ltoreq.85.times.(C)+60 (1)RA.gtoreq.-0.875.times.(TS)+158 (2)whereC: carbon content (wt %),TS: tensile strength (kgf/mm.sup.2), andRA: reduction of area (%).

Abstract: In a high strength, low thermal expansion alloy wire, particularly used as the material for central section wire of low relaxation, overhead power transmission line, the number of rupture twisting is improved with retaining desired tensile strength (100 kgf/mm.sup.2), elongation (1.5% or more) and linear thermal expansion coefficient (average in the range of room temperature to 300.degree. C., .alpha.<5.times.10.sup.-6 /.degree. C.). The wire is made of an Fe-Ni-based alloy of specifically selected alloy composition. Process for preparing the wire comprises, hot rolling the alloy material, peeling the rolled wire, cold drawing, annealing and surface coating the drawn wire. The above improvement can be achieved by carrying the hot wire rolling under such conditions that the quantity of intergranular precipitations is up to 2% and/or that the averaged crystal grain size in the rolling direction is in the range of 5-70 .mu.m, at finishing the hot wire rolling.

Abstract: The present invention discloses a process for producing a patented steel wire having a microstructure which is essentially pearlite with a very fine lamellar spacing between carbide and ferrite platelets which has good ductility and which can be drawn to develop high tensile strength, said process comprising the steps of:(1) heating a steel wire to a temperature which is within the range of approximately 850.degree. C. to about 1050.degree. C. for a period of at least about 2 seconds; wherein said steel wire is comprised of a microalloyed high carbon steel which consists essentially of about 97.03 to about 98.925 weight percent iron, from about 0.72 to about 0.92 weight percent carbon, from about 0.3 to about 0.8 weight percent manganese, from about 0.05 to about 0.4 weight percent silicon, and from about 0.005 to about 0.

Abstract: High strength low carbon steel wire rods excellent in the cold drawing property have a composite structure in which an acicular low temperature transformation phase comprising a martensite, bainite and/or the mixed structure thereof that comprises, by weight %,C: 0.02-0.30%,Si: less than 2-5%,Mn: less than 2.5% andthe balance of iron and inevitable impurities and that may partially contain retained austenite is uniformly dispersed at the volume ratio of from 10 to 70% in the ferrite phase, and in which the weight of (C+N) in solution the ferrite phase is less than 40 ppm.

Abstract: A thermomechanical method for improving the fatigue characteristics of a metallic material (for example carbon steel and low alloy steel) takes advantage of the materials' plastic flow characteristics to improve external and internal surface conditions. The material is heated to a temperature in the range of about 0.3 to 0.45 its homologous temperature, e.g., from about 200 degrees C to about the Young's Modulus Transition Temperature of said material. While the temperature of the material is in this range, force is applied to the material to produce in at least the region of said material to be treated a tensile stress level greater than the yield point of said material at the temperature, and thereby to produce limited plastic elongation in the region. The material is then cooled under stress, the stress being maintained above the instantaneous yield point of the material during at least part of the cooling process. As a result of this process, the shape of existing stress raisers (e.g.

Abstract: A high-strength extra fine metal wire of a diameter of 0.01-0.50 mm containing 0.60 wt %-1.20 wt % carbon, consisting of a metal structure in the form of bundle of said carbides and presenting a shape about rectangular or circular in which the ratio of the length in the longitudinal direction to the length in the direction of width in the cross section is no more than 2.5 and the mean sectional area is no more than 150.times.10.sup.-4 .mu.m.sup.2, and improving strength and tenacity by having a tensile strength of 300 kgf/mm.sup.2 or over.

Abstract: The present invention is concerned with a method of producing steel wires each having a very small diameter of 0.4 mm or less and a tensile strength of 360 kgf/mm.sup.2 or more wherein a steel material having a composition comprisingC: 0.90 to 1.10% by weight, Si: 0.4% or less by weight, Mn: 0.5% or less by weight, Cr: 0:10 to 0.30% by weight and a balance of iron an unavoidable impurities is subjected to diffusion treatment as desired, thereafter, the steel material is subjected to hot rolling, the hot-rolled steel wire is subjected to drawing, subsequently, the resultant steel rod having a smaller diameter is subjected to a final patenting treatment to give said rod a strength of 140 to 160 kgf/mm.sup.2, and thereafter, it is subjected to drawing with a true strain of 3.50 or more using a die having a die approach angle of 8 to 12 degrees.

Abstract: Sway bars made of high strength steel having grains with a preferred orientation, and methods of making such sway bars from blanks of high strength steel typically having a yield strength of at least about 90,000 psi and a tensile strength of at least about 120,000 psi.

Abstract: An improved method is proposed for the manufacture of a very fine high-carbon steel wire having a diameter of 50 .mu.m or smaller. In the wire drawing process by repeating a plural number of cycles each consisting of a patenting treatment and a cold-drawing treatment starting from a base steel wire rod, the final drawing treatment is preceded by a heat treatment of the intermediate wire having a diameter of about 100-500 .mu.m in an atmosphere of a gaseous mixture of 90-98% by volume of nitrogen and 2-10% by volume of hydrogen at 750.degree.-900.degree. C. for 1-30 seconds so that the final drawing can be safely conducted without breaking of the fine wire.

Abstract: A method of producing steel wires intended for the manufacture of flexible conduits, steel wires obtained by this method, and flexible conduits reinforced by such wires is characterized by the fact that, for a given strain-hardening rate of the initial wire, a heat treatment is carried out under conditions of time and temperature such that the steel wire obtained after treatment has a mechanical rupture strength (Rm) greater than 850 MPa and a structure containing little free ferrite.

Abstract: This invention reveals steel alloys which are particularly suitable for use in manufacturing reinforcing wires for rubber products, such as tires. The steel filaments made by this process have an outstanding combination of strength and ductility. Additionally, the steel alloys of this invention can be patented in a low cost process due to their having a very fast rate of isothermal transformation. This allows the steel in the steel wire being patented to transform from a face centered cubic microstructure to an essentially body centered cubic microstructure within a very short period. This invention more specifically discloses a steel alloy composition which is particularly suitable for use in manufacturing reinforcing wire for rubber products which consists essentially of (a) about 92.8 to about 99.18 weight percent iron, (b) about 0.4 to about 1.5 weight percent carbon, (c) about 0.05 to about 1 weight percent silicon (d) about 0.05 to about 1.2 weight percent manganese, (e) about 0.01 to about 1.