High local loads at leading edges, cobbles or doubling of the stripend (tail end pinching), exceed the shear strength of the shell material and initiate the crack.
过大的局部超负荷超过轧辊外层的抗剪切强度时则会引发裂纹。
2
The important reason for the poor stability during strip hot rolling process was the working fault resulted by the deviated running of the strip in the mills and the stripend defects.