Rare earth elements are effective deteriorating agents for steel's extremely strong purifiers and clean steel inclusions. With the advancement of metallurgical technology, the content of S and O in steel is continuously decreasing, which provides conditions for the alloying effect of rare earth elements.
Adding an appropriate amount of rare earth lanthanum to the 20 steel, in addition to significantly improving the sulfide inclusion morphology in the steel, the size is also greatly reduced, and the distribution of inclusions is also converted to a diffuse distribution, which becomes more uniform than the original.
Adding an appropriate amount of rare earth lanthanum to the 20 steel can effectively deteriorate the inclusions such as MnS, Al2O3, or aluminate or silicate in the steel. The inclusions after metamorphism are low hardness, spherical or nearly spherical, with reduced outer dimensions and high melting point. The thermal expansion coefficient and elastic modulus are close to the steel matrix, and stress concentration is less likely to occur around the steel. It does not deform or deform during rolling. Very small to improve the hot workability of steel. In the 20 steels with different rare earth lanthanum contents, the types and amounts of rare earth inclusions are different. As the rare earth content increases, the amount of rare earth sulfide inclusions in the steel increases. According to the stable order of the rare earth compounds and the rare earth content, the inclusions in the steel should be RE2O3, RE2O2S and RES.
The addition of rare earth lanthanum can increase the thermoplasticity of 20 steel, mainly because of the microalloying of rare earth lanthanum to refine its structure. The addition of rare earths can prolong the pearlescent transformation and thus refine the martensite lath.
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Label: rare earth element 20 steel
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