Effects of Lanthanum-cerium Mischmetal and Rolling-start-temperature on Microstructure and Corrosion Resistance of HRB400E Steel
In order to improve the corrosion resistance of HRB400E steel,test steel is rolled by adding lanthanum-cerium mischmetal into it in refining process and controlling rolling-start-temperature.The inclusions and microstructure are characterized with scanning electron microscope,energy dispersive spectrometer and optical metallographic microscope as well as the effects of rare earth and rolling-start-temperature on corrosion resistance of test steel are analyzed combi-ning with neutral salt spray test.The results showed that the Mn-Si-O inclusions were completely transformed into(Ce,La)2O3 and(Ce,La)2O2S after treatment with lanthanum-cerium mischmetal as well as part of Mn and S were nucleated around them to form complex inclusions of rare earth,but a small amount of individual MnS inclusion was still precipitated.Under the experimental conditions,the corrosion resistance of 2#test steel is optimal when rolling-start-temperature is 900℃,content of mischmetal is0.011 6％and corrosion rate is1.577 g/(m2·h).
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