Key technology of smelting specified hardenability structural steel
The hardenability of steel is of great significance for ensuring the service life,performance stability,and work safety of steel.The specified hardenability steels have important applications in manufacturing,construction,aerospace and other fields.Focusing on the development of specified hardenability structural steels in China,the e-volution of their standards is outlined.Taking gear steel as an example,the requirements for metallurgical quality indexes such as hardenability,purity,banded structure,grain size and easy machinability of specified hardenability structural steels are systematically summarized.The key technologies of smelting gear steels,such as oxygen con-tent control,precise composition control and inclusion control are analyzed.Key control points for smelting and con-tinuous casting processes have been proposed,and the smelting technical processes are detailed analyzed.Two main-stream technological routes,namely calcium treatment and non calcium treatment processes,are described in detail.The above summary and analysis provide a reference for all types of specified hardenability structural steel and cold heading steel smelting.
NETL
NSTL
万方数据
