Effect Of Rare Earth On Dissolution Behavior Of Low Temperature Oriented Silicon Steel During Heating

As a soft magnetic alloy with low iron loss and high magnetic induction,oriented silicon steel is mainly used in the manufacture of iron cores for electromagnetic equipment such as transformers and electromagnetic relays.It is known as a handicraft in steel products.There are mainly three kinds of oriented silicon steels:MnS,AlN and Cu₂S.These three kinds will be solid solution during the high temperature heating process before hot rolling,and will be precipitated in the subsequent hot rolling process.They are very small and numerous,showing a diffuse distribution.Oriented silicon steel grains.Many enterprises that use traditional methods to produce oriented silicon steel in order to fully dissolve the MnS particles in the steel,the high temperature heating temperature is generally 1350¹400?,the temperature is higher,the energy consumption is larger,and the environmental pollution problem is more serious.Therefore,the use of some means to reduce the heating temperature of oriented silicon steel slab,achieve low energy consumption and environmental protection has become an urgent problem to be solved in the research of oriented silicon steel in recent years.A large number of studies have shown that the addition of trace rare earths has a certain influence on the precipitation of inhibitors in the hot rolling,normalizing and cold rolling stages of oriented silicon steel,but the research on the influence of rare earth on the dissolution behavior of inhibitors during high temperature heating before hot rolling less.In this paper,the effect of rare earth on the dissolution behavior of inhibitors in the high temperature heating process of oriented silicon steel was studied by adding rare earth La,which provided a theoretical basis for the development of the pre-rolling heating process.In this paper,a rare earth La?11ppm?was added to ordinary oriented silicon steel with a silicon content of 3%.The effect of the point;the box-type resistance furnace heated the two samples to 1200?,1250?and 1300?under the same holding time,to investigate the effect of rare earth La and heating temperature on the dissolution behavior of oriented silicon steel microstructure and inhibitor;The two samples were kept at 10 min,20 min and 30 min respectively to investigate the effect of rare earth La and holding time on the dissolution behavior of oriented silicon steel microstructure and inhibitor.The results show that the addition of trace rare earth?11ppm?La has almost no effect on the phase transition point of oriented silicon steel.The phase transition point of oriented silicon steel without rare earth is 737.3?,and the phase transition point of rare earth oriented silicon steel is 736.9?.Temperature or prolonged holding time will increase the grain size of rare earth-containing and rare earth-free oriented silicon steel.The addition of trace rare earth La can refine the grains;increase the heating temperature or prolong the holding time,and the inhibitor in steel continuously dissolves.The change of Cu₂S and MnS is most obvious;the areal density of the inhibitor is continuously reduced,the small size of the undissolved material is continuously reduced,and the large-sized undissolved material is gradually converted into a small-sized undissolved matter and continuously dissolved into the matrix,and the rare earth is suppressed.Dissolution of the inhibitor.The types of inhibitors in rare earth-containing and rare earth-free oriented silicon steels are basically MnS and Cu₂S.In the unheated original state,there are mainly MnS,TiN and CuS phases.After heating to 1250?for 30 minutes,there are mainly MnS and TiN.Seed phase;the addition of trace rare earths did not affect the type of inhibitor.