| 摘要 |
PURPOSE: A preparation method of steel wire by adjusting a steel composition adequately and controlling a hot rolling and cooling condition without a tempering and quenching treatment is provided which reduces the production cost and simplifies the manufacturing process. CONSTITUTION: Steel comprising C:0.30-0.60%, Si:0.10-0.40%, Mn:0.8-2.0%, Cr:0.03-1.0%,V:0.03-0.15%, Ti:0.010-0.040%, Al:0.01-0.10%, P:below 0.030%, S:0.020-0.10%, N:0.005-0.030% in weight, and Fe or unavoidable impurities is hot-rolled at 1,000-1,150°C, winded in a coil, cooled by passing through a section at a temperature of 550-750°C at a speed of 0.1-1.0°C/sec and cold-drawn to the reduction rate of 5.0-30% to give non quenched and tempered steel rod wire. The product is useful for a car rack bar, etc.
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