Method for producing 60 mm extra-thick steel plates with low compression ratio

The invention belongs to the metallurgy field and particularly relates to a method for producing 60 mm extra-thick steel plates with a low compression ratio. The technical scheme includes: (1) using solidification heat transferred model provided by a domestic scholar Ye Fanxin to calculate casting blank center solid fraction rate of 0.75-0.95; (2) carrying out being presses 10-30 mm at the solidification end. The method for producing the 60 mm extra-thick steel plates with the low compression ratio is characterized in that depressed deformation from a surface to a high-temperature center part is capable of effectively enabling a center to loose and press, the problems that crack detections of thick plates or extra-thick plates are unqualified can be solved effectively, when the compression ratio is 1.5, a crack detecting rate of produced thick plates can be still guaranteed to obtain 95%. The method for producing the 60 mm extra-thick steel plates with the low compression ratio is capable of producing the extra-thick steel plates with good interior quality to a manufacturing technique of ordinary continuous casting thick plates and achieving the purposes of substantially reducing the casting blank loose, and equipment is easy to obtain, and a operational method is simple. The method for producing the 60 mm extra-thick steel plates with the low compression ratio can be widely popularized and applied in industries.