Abstract
The microstructure, mechanical properties, precipitation of micro alloying elements and welding performance of self-designed 20MnSi steel were investigated, by means of metallographic microscope , transmission electron microscope, electroslag pressure welding and mechanics performance tests, etc.The results show that,with the actions of microalloy V and controlled rolling and controlled cooling technique, tensile strength (Rm) and yield strength (Rel) of the test bar could respectively reach 730 MPa and 560 MPa, uniform elongation (Agt %) of 13.5%, which has met the seismic performance index. And we found that a lot of dispersion particle V (CN) precipitated in the ferritic matrix and grain boundary place, which have a good precipitation strengthening and refining grain effect. In addition, based on the welding parameters reasonable controlling, it can make the mechanical properties of welding joints changes not beyond the design range, and satisfy the use requirement.
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