Optimization of low temperature fine grain HRB400E disc screw production process
Disc screw produced by micro-alloying hot rolling process has stable mechanical properties and good surface qual-ity,but production cost is high.By designing different chemical composition system and different rolling process,analyzing and comparing the difference of mechanical properties and microstructure of disc screw,a low cost production process of disc screw was developed.The system of low Mn without micro-alloy composition is adopted,mass fraction of Mn is 1.10％～1.60％,entire process adopts low-temperature rolling and post rolling controlled cooling technology.Opening rolling tem-perature is 940～980 ℃,and method of pressurization by low temperature opening rolling pre-finishing rolling and post-rolling cooling water is adopted.Finishing rolling is 830～870℃,wire laying temperature is 860～900 ℃,and structure and properties are controlled by controlling process temperature and cooling rate of coil on air cooling line.HRB400E high strength seismic disk screw with mechanical properties and microstructure meeting requirements of national standard was obtained.
HRB400Edisc screwyield strengthcontrolled rolling and coolingsurface qualitymicrostructure
万方数据
维普
