Low-aluminum low-sulfur high-chromium high-nitrogen pressure vessel steel and smelting method

The invention discloses low-aluminum low-sulfur high-chromium high-nitrogen pressure vessel steel and a smelting method, and belongs to the technical field of steelmaking, and the low-aluminum low-sulfur high-chromium high-nitrogen pressure vessel steel comprises the following chemical components in percentage by weight: 0.06-0.15% of C, 0.2-0.5% of S i, 0.3-0.6% of Mn, less than or equal to 0.025% of P, less than or equal to 0.003% of S, 0.005-0.015% of Al t, 8.0-13.5% of Cr, 0.8-1.2% of Mo, 0.15-0.3% of V, 0.05-0.1% of Nb, 0.03-0.08% of N, and the balance of Fe and other inevitable impurities. The smelting method comprises the steps of converter smelting, LF refining, RH vacuum treatment and conventional continuous casting. According to the method, equipment does not need to be added, deep desulfurization is guaranteed under the low Al t condition, LF refining parameters are optimized, the LF is adopted for smelting the high-N and high-Cr steel, all components are stably controlled, and the components of th