Low-carbon steel and preparation method thereof

The invention relates to low-carbon alloy steel and a preparation method thereof. The low-carbon alloy steel comprises the following chemical components: 0.03 to 0.13 percent of C, 0.6 to 1.40 percent of Mn, 0.15 to 0.30 percent of Si, 0.010 to 0.020 percent of Nb, 0.10 to 0.30 percent of Ni, 0.015 to 0.030 percent of Ti, less than or equal to 0.25 percent of Cr, 0.015 to 0.060 percent of Al, 0.01 to 0.02 percent of N, less than or equal to 0.20 percent of V, less than 0.015 percent of P, less than 0.020 percent of S and the balance of Fe and acceptable impurities. 本发明涉及一种低碳合金钢及其制备方法。低碳合金钢的化学成分如下：C：0.03～0.13％，Mn：0.6～1.40％，Si：0.15～0.30％，Nb：0.010～0.020％，Ni：0.10～0.30％，Ti：0.015～0.030％，Cr≤0.25％，Al：0.015～0.060％，N：0.01～0.02％，V≤0.20％，P＜0.015％，S＜0.020％，其余为Fe和可接受的杂质。