Cold heading steel is used for manufacture of fasteners and connecting parts.The premise of stable performance of cold heading steel is reasonable composition design,stable process control,and good steel purity and surface quality.In or-der to obtain 35B quenched and tempered medium carbon steel with stable performance,chemical composition was reasona-bly designed,and process control such as high carbon drawing,deoxidation alloying,inclusion modification treatment and optimization of addition sequence of alloy elements were adopted.Boron containing cold heading and cold extrusion steel with qualified cold heading detection was successfully developed,which met user's requirements.
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