Effect of cooling rate after hot rolling and of multistage strain aging on the drawability of low-carbon-steel wire rod

摘要: Tensile testing was used to simulate the multistage strain aging occurring in low-C steel during relatively short intervals between dies a multiple-die wire-drawing machine. The effects were examined of three simulated post-hot-rolling cooling rates and thermal treatments on strain-aging susceptibility high- low-N steel. This measured by applying 6 pct tensile strain, followed at either 65° or 100 °C for 20 seconds, then pulling specimen failure room temperature. Increases flow stress decreases elongation fracture both indicated high aging. It found that nitrogen content, rate from hot-rolling temperature about 300 °C, as well below all have dramatic behavior. Moreover, is more severe than single-stage implications these observations increasing drawability low-carbon-steel wire are discussed.