The cycle of two ethane furnaces in No. 1 ethylene plant of YPC Limited Company is very short. The short life-span of tubes in radiation section affects the stable operation of quench oil system.
中国石化扬子石油化工股份有限公司烯烃厂1号乙烯装置两台乙烷炉运行周期一直偏低，辐射段炉管使用寿命较短，并影响急冷油减粘系统的稳定运行。
Crack perpendicular to the axis is caused on too rapid quench cooling, non-hardenability of the thick-walled department, as well as mutation of cross-section size. This is a typical arc-shaped crack.
垂直于轴线的裂纹是因为淬火快速冷却时。厚壁处未淬透以及截面尺寸突变产生的弧形裂纹。
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