High-temperature ablation resistance low-carbon medium-low alloy steel and preparation method thereof

The invention discloses high-temperature ablation resistance low-carbon medium-low alloy steel. The steel is characterized by comprising the following chemical components of, in percentage by weight,C is greater than 0 and smaller than 0.2%, 2.5%-3.5% of Cr, 0.5%-1.4% of Mo, 1.6%-2.0% of Ni, 0.2%-05% of W, 0.3%-0.8% of V, 0.03%-0.08% of Nb, and the balance Fe. According to the steel, an alloy content is not improved, the ablation resistance of the high-and-low-carbon medium-low alloy steel is optimized, the advantages of low alloy amount, low cost, simple and feasible processes are achieved,the method effectively improves the high-temperature ablation resistance of the alloy steel on the basis of ensuring excellent strength and toughness at the same time, a maximum diameter and a maximumdepth of an ablation pit is 5 mm and 3 mm respectively. 一种高温抗烧蚀低碳中低合金钢，其特征在于：所述低碳中低合金钢的化学成分按重量百分比计为0＜C＜0.2%、Cr：2.5~3.5%、Mo：0.5~1.4%、Ni：1.6~2.0%、W：0.2~0.5%、V：0.3~0.8%、Nb：0.03~0.08%，其余成分为Fe。本发明通过不提高合金含量，而是优化合金元素的方法提高低碳中低合金钢抗烧蚀性能