Method for producing large-specification H-shaped steel by using medium-specification special-shaped blank

The invention discloses a method for producing large-specification H-shaped steel by using a medium-specification special-shaped blank, and belongs to the field of steel production, the production process comprises special-shaped blank BD rolling, multi-pass continuous rolling and cooling: (1) special-shaped blank BD rolling: adopting waist expanding rolling; (2) multi-pass continuous rolling: adopting an X-H rolling method; (3) cooling: adopting segmented cooling; natural cooling is adopted in the first one third stage of the total cooling time, and the cooling speed is 12-14 DEG C/min; strong wind cooling is adopted at the last two-thirds stage of the total cooling time, and the cooling speed is 25-30 DEG C/min. Compared with the prior art, the process can be matched with general special-shaped blanks of medium specifications, the difficulty and the cost of early-stage operation are reduced, and high-dimensional precision control can be realized. 本发明公开了一种使用中规格异型坯生产大规格H型钢的方法，属于钢铁生产领域，生产工艺包括异型坯BD轧制、多道次连轧、冷却，其