一、前言钢中的MnS易於在热轧时沿轧制方向延伸,致使钢具有各向异性。许多事故分析研究指出:这种条状MnS夹杂的存在,是造成使用部件在各种复杂应力状态下破坏的主要原因。如何设法消除这种有害的MnS夹杂以满足使用上的要求,这对于许多用途的部件是非常重要的。如大型高强度输送管道、核子反应堆容器、宇航飞行器、舰船、桥梁的大型锻轧、焊接部件等。 I. Introduction MnS in steel tends to extend in the rolling direction during hot rolling, resulting in anisotropy of the steel. Many accident analysis studies have pointed out that the existence of such strip-shaped MnS inclusions is the main reason for the use of components under various complex stress conditions. How to try to eliminate this harmful MnS inclusions to meet the requirements of the use, which for many uses of parts is very important. Such as large-scale high-strength pipelines, nuclear reactor containers, spacecraft, ships, bridges, large forging rolling, welding parts.