Hot-rolled H-shaped steel with yield strength of 550MPa and production method of hot-rolled H-shaped steel

The invention discloses hot-rolled H-shaped steel with yield strength of 550MPa and a production method of the hot-rolled H-shaped steel. The H-shaped steel comprises the following chemical elements in percentage by mass: 0.13%-0.16% of C, 0.35%-0.55% of Si, 1.35%-1.55% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.06%-0.12% of V, 0.02%-0.04% of Nb, 0.30%-0.55% of Cr, 0.15%-0.40% of Ni, 0.01%-0.013% of N and the balance of Fe and inevitable impurities. The hot-rolled H-shaped steel with the yield strength of 550MPa, which has the yield strength of more than or equal to 550MPa, the tensile strength of more than or equal to 670MPa, the elongation A of more than or equal to 18%, the longitudinal V-shaped impact energy KV2 of more than or equal to 100J at the temperature of 0 DEG C and the flange thickness of 40-80mm, is produced by adopting the processes of molten iron pretreatment, converter smelting, argon blowing refining, LF refining, special-shaped blank full-protection casti