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Steel continuous casting is an important part in steel production and the continuous casting ratio has steadily increased, exceeding 90% in the 2000s.1) The presence of internal cracks in thick slabs is a critical defect during continuous casting, on account of these cracks will reduce product quality and affect the subsequent rolling process.2) Owing to the advancement of the understanding in steel solidification phenomena, steel structure, and strand behavior in the casting machine, caster profiles have been improved from simple vertical type to vertical and bending after complete solidification to curved mold and solid or liquid core unbending to vertical mold multi-point progressive bending and straightening with liquid core.1) It had been reported that the internal cracks are resulted from the excessive tensile strains produced by means of straightening at the solidifying front of the slab.3,4) Pascon et al. and Pascon and Habraken had done some research works on the risk of transverse cracking during bending and straightening of steel slabs.5,6) They indicated that Transverse cracks were most likely to occur at the edge on the upper face, at the end of straightening of the slab. This is due to the comCreep Straightening Technology of Continuous Casting Slab Based on High-temperature Creep Property