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前言 40Cr钢辊件系经平炉冶炼,上注成1O吨钢锭,热送至锻压车间加热锻造成型。在锻造拔长时,在头部产生很多与轴线相平行的纵向裂口,裂口较深。在上车床车削加工时发现在裂口区的里面相当于轴的第二、三台阶处有很多肉眼可见与轴心平行密集分布的纺锤形裂口,在裂口内有灰白色的夹杂物,结合松散,形似水泥,用摄尖就可将其取下呈粉末状。根据评级标准,现场判为夹灰(又称夹渣或低倍夹杂),是一种不能允许的冶金缺陷,属于低级废品。由于这些夹渣分
Preface 40Cr steel roller system smelting by flat hearth, the injection of 1O tons of steel ingots, heat sent to the forging workshop heating forging molding. Long forging in the long, the head produced a lot of longitudinal cracks parallel to the axis, the gap deeper. In the turning lathe machining found in the rift zone inside the equivalent of the shaft of the second and third steps at the many visible with the axis parallel to the dense distribution of spindle-shaped gap in the gap with white inclusions, combined with the loose, Cement, with a tip can be removed from the powder. According to the grading standards, the site sentenced to dust (also known as inclusion or low inclusion), is an impermissible metallurgical defect, belonging to low-level waste. Due to these slag points