Abstract：Linearity crack sometimes appears on microalloy steel plate surface about 100mm from edge in “ingot casting + bloom rolling”,which is regularly deep or shallow,and
conduces so much waste product that affects normal production.These have been thought of rolling fault,but this text judges them coming from steel ingot surface microcrack based on macro-scopical shape and micro-structure research. Microalloy steel plate will craze at the most pull-stress position,which provides theoretical foundation for product quality improvement.These fault has greatly reduced after we adopt effective technique measure.
2010, Vol. 45 
