Abstract
By means of Gleeble-1500 dynamic thermo mechanical simulator using solidifying method, the simulation of continuous casting process for HRB335C steel was carried out and hot ductility and strength were determined. The test results indicate that there were three temperature areas of brittleness for billet produced by HRB335C within 700°C to solidification point, the first temperature area of brittleness was 1300°C to solidification point of the billet, the second temperature area of brittleness was 1200～1000°C, the third temperature area of brittleness was 700～850°C, the steel was plastic within 850～1000°C. The fractographs and micrographs were observed by optical microscope. The reason of embrittlement was analyzed. The cracking sensitivity studied under the different the temperature zone of the fragility for steel HRB335C was found out. The appropriate surface temperature (over 1000°C) of continuous cast billet during bending and straightening was beneficial to avoid and reduce surface cracks and the quality of billet was obviously improved. Key words: Brittle temperature zone; Tensile strength; Microstructure; High temperature mechanical properties; Continuous casting billet
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