Acid-corrosion-resistant steel, preparation method thereof and corrosion-resistant pipe

The invention provides acid-corrosion-resistant steel, a preparation method of the acid-corrosion-resistant steel and a corrosion-resistant pipe. The acid corrosion resistant steel comprises the following chemical components in percentage by weight: 0.05-0.15% of C, less than or equal to 0.3% of Si, less than or equal to 0.6% of Mn, 0.8-1.2% of Cr, 0.6-0.9% of Mo, less than or equal to 0.3% of V, 0.01-0.05% of Nb, less than or equal to 0.05% of Al, less than or equal to 0.005% of S, less than or equal to 0.01% of P, 0.7-2% of Cu, and the balance of iron and inevitable impurities, wherein the weight percentage of Ni/Cu is more than or equal to 0.5 and less than or equal to 1. Based on the characteristic of low carbon content, the acid corrosion resistant steel is endowed with high SSC resistance. By balancing the chemical components of the acid corrosion resistant steel, the double contradictory relationship between high strength and high toughness and between high strength and SSC resistance is solved. 本发明提供了