Smelting Process Optimization and Performance Analysis of 700L Automobile Beam Steel
ZHANG Liwu
Abstract：With the development of automotive industry,higher performance requirements are put forward for lightweight automotive steel,which promotes the continuous optimization of smelting process.In this paper,the 700L smelting process of automobile beam steel was optimized.The dephosphorization rate of converter was improved by improving the early oxidation of converter,slag retention operation,reasonably controlling the lance position and oxygen flow,and using slag detection and slag retaining cone technology;By optimizing the refining furnace slag system,refining deep deoxidation,using automatic argon blowing,double stage soft blowing,whole process protective pouring,slab weak cooling and other technologies,the stable production of 700L coil was realized.Through process optimization,the yield strength of 700L steel is 607-618 MPa,the tensile strength is 699-732 MPa,the elongation after fracture is 18％-21.5％,and the absorption work is 91.03-102.37 J,which has good comprehensive mechanical properties and meets the needs of steel for automotive industry.
Keywords：700L beam steeldephosphorizationprocess adjustmentmechanical propertiesinclusion control
Publication Date：2025-04-25
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 23-26 )