Synopsis High-carbon steel wire rods with a composition of 0.85 wt% C, 1.19 wt% Si and 1.19 wt% Mn were given a lead patenting treatment. The result shows that the steel wire rod has a tensile strength higher than that of plain high-carbon steel rod by 17 kgf /mm2. Then, the wire rod was drawn by the direct cooling drawing system to prevent strain aging. Based on these experimental results, high-strength large diameter galvanized steel wires with nominal diameters of 5, 6, and 7 mm were trially manufactured. The mechanical properties of the new Si-Mn galvanized steel wires were experimentally proved to be 20 to 30 kgf /mm2 higher in tensile strength and 7 to 10 kgf /mm2 higher in fatigue strength than plain highcarbon galvanized steel wires. There was no perceivable deterioration in toughness, and the relaxation value after 10 h was only one-third of that of the high-carbon galvanized steel wires. Thus, the newly-developed high-strength Si-Mn galvanized steel wires were proved to be suitable for use as cable wires for long span suspension bridges and other purposes.
Synopsis 111 order to improve the drawability oJ wire and wire rod and to obtain th e mechan ical properties desirable in. drawn wire, the lead patenting has long been a/J/Jlied in /Jractical use. R ecently, however, there has been a demandJor lead-less /)(ltenting OTI the part oJ custom ers who Jace growing /mblic COllcern about occupational health and the prevention oJ pollution. A s a means oJ settling those problems, the fluidi zed bed patentillg method
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