Continuous casting technology die casting technology, compared with high yield, stability and quality characteristics of the reduction process. From an economic perspective and quality requirements into consideration, while in the next process, must be free of defects of continuous casting slab, if possible, do not require any checking and processing. Has been informed that internal or surface crack of continuous casting slab and crack formation mechanism of high temperature properties of case materials, researchers with a large number of high - temperature tensile testing. Usually, just below 1000 ℃ high temperature tensile tests are called " Wen La extension ", and to below its melting point temperature l0OO ℃ high temperature tensile tests of being called " high temperature tensile ". High temperature tensile test of strength and toughness and ductility of the material to achieve during the solidification and casting process to optimize the product quality.