High strength and high toughness steel bar, rod and wire and the

Details High strength and high toughness steel bar, rod and wire and the High strength and high toughness steel bar, rod and wire and the

1988-07-01

1989-12-26

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12F, 148320, 148333, C22C 3802, C21B 806

Patent

active

048895679

ABSTRACT:
Wire rods containing an adequate quantity of C within the range from 0.70 to 1.00%, Si from 0.5 to 3.0%, Mn from 0.30 to 2.0%, Cr from 0.10 to 0.5%, Al from 0.030 to 0.10% and N from 0.004 to 0.015% and unavoidable impurities, and with Fe for all the rest are subjected to re-heat patenting to increase the tensile strength to 135 kgf/mm.sup.2 or higher, then are drawn by adequately selecting the conditions, number of times of drawing in the range from 7 to 16 times, drawings speed from 50 to 550 m/minute, extent of drawing form 70-90, and water cooling immediately after each drawing to manufacture steel wires of high strength and high toughness.
The wires are used as PC wires, steel wires for skewed bridge cables, steel stranded wires, spring wires, main cable wires for extra-long suspension bridge large diameter wires for core of aluminum cables steel reinforced (transmission cable), and as galvanized steel wires for such applications.

REFERENCES:
patent: 3617230 (1971-11-01), Richards et al.
patent: 3668020 (1972-06-01), Lucht
patent: 4046600 (1977-09-01), Yamakoshi et al.
ASM, "Cold Drawing Steel Wire", Metals Handbook, pp. 358-359, Edited 1948.
Chemical Abstracts, vol. 99, No. 8, Aug. 22, 1983, p. 215, Abstract No. 57328m, Columbus, Ohio, U.S.; "High-carbon steel wire with excellent drawability", Nippon Steel Corp.
Stahl und Eisen, vol. 97, No. 9, May 5, 1977, pp. 464-466, L. Tegel, "Direkte wasserkuehlung des Drahtes and Mehrfach-Ziehmaschinen", FIGS. 1, 2, p. 464 last paragraph; p. 465, left-hand col. line 13.
"Application of Stelmor Processed High-Silicon Steel Wire Rod to Prestressed Concrete Wire and Strand", Oct. 1981, Nippon Steel Corporation.

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