Continuous casting alloy steel bloom convex combined roller and heavy pressing process

The invention discloses a continuous casting alloy steel bloom convex combined roller and a heavy pressing process. The core quality problem of a continuous cast bloom is solved. The technical schemecomprises the convex combined roller and the heavy pressing process; the convex combined roller is characterized in that a pulling-straightening roller is designed to be a constant-curvature boss-freeconvex roller body capable of improving the segregation in the flowing direction of enriched molten steel before the continuous cast bloom is solidified and a gradually-changed-curvature boss convexroller body capable of compensating severe looseness and cavity shrinkage defects formed by volume shrinkage; the constant-curvature boss-free convex roller body is located at the position where the central solid phase ratio is 0.2; the gradually-changed-curvature boss convex roller body is located at the position of the solidification ending point; the accurate pressing parameters of the convex roller bodies are determined