The invention belongs to the technical field of metallurgical materials, and particularly relates to a production process of 500MPa-level H-shaped steel for ocean engineering. The production process of the 500MPa-level H-shaped steel for ocean engineering is characterized in that a casting blank is heated to 1100-1200 DEG C, heat preservation is carried out for at least 2h, and a steel blank is forged; the steel blank is heated to 1200-1250 ℃, heat preservation is carried out for at least 2h, two-stage rolling is respectively carried out on an austenite recrystallization area and an unrecrystallized area, rolling is carried out for 5-7 passes, the steel blank is cooled at the cooling speed of 30-150 ℃/s to bainite transformation area Ms-650 ℃, and then subjected to air coolingto room temperature, and the 500MPa-level H-shaped steel is obtained. By means of the production process of the 500MPa-level H-shaped steel for ocean engineering, the 500MPa-level H-shaped steel for ocean engineering is developed, the strength is improved on the original basis, the performance is stable, and the domestic gap is filled.
