某厂碱性电炉冶炼30号钢钢锭,有一炉浇注16时钢锭8根,均发现表面纵向裂纹。裂纹从冒口纵向延伸至锭身总长的1/2处。8根钢锭裂纹形状基本相同。一、化学成分(％) 0.29C,O.30Si,0.80Ma,0.008S,0.01 7P。二、低倍检查从裂纹头、中、尾三个部位分别取横向低倍试样。经50％盐酸水溶液热蚀后,可看到三块试片试验结果基本相同,裂纹深度约有100mm左右,贯穿整个柱状晶区。裂纹前端一 Alkaline furnace smelting a steel ingot No. 30, a furnace cast ingot 16 ingot 8, were found on the surface longitudinal cracks. Cracks extend longitudinally from the riser to 1/2 of the total length of the shaft. 8 root ingot crack shape is basically the same. First, the chemical composition (%) 0.29C, O.30Si, 0.80Ma, 0.008S, 0.01 7P. Second, low-fold inspection From the crack head, middle and tail of the three parts were taken horizontal low-fold samples. After 50% hydrochloric acid solution hot corrosion, we can see that the three test pieces test results are basically the same, the crack depth of about 100mm or so, throughout the columnar crystal region. One crack front