The fire-resistant hot-rolled H-beam steel is the newly developed structure material. The development situation of the fire-resistant H-beam steel is briefly introduced. The chemical composition, microstructure, room temperature and high temperature mechanical properties and weldability of several batches of the developed domestic fire-resistant hot-rolled H-beam steels are comprehensively analyzed. The results show that the newly developed hot-rolled fire-resistant H-beam steel has very high room temperature strength, certain high temperature strength, good welding performance, but the toughness needs to be further improved. The performance of web and flange of H-beam steel has large gap.
The samples of V-N microalloyed mild steel were obtained in duo mill with the normal
deformation rate and the normal rolling temperature except final rolling temperature, which is at
780°C, 730°C and 680°C respectively. The tensile test was carried out and the microstructure was
observed with optical microscope. It was found that the mechanical properties improved dramatically
compared with normal process, the final rolling temperature is more than 900°C. The main reason is
the fine grain size and second phase particles. With the final rolling temperature decreasing, the
mechanical property further improves until the final rolling temperature of 700°C.
The application of vanadium-nitrogen alloy to develop a certain low carbon high strength H-beam steel was determined through the combination of theoretical study, product requirements and existing practical conditions. The specific rolling process was further defined through laboratory experiments. The developed low carbon high strength H-beam steel was trial produced and its properties were also analyzed. The results showed that the newly developed low carbon high strength H-beam steel had excellent mechanical properties and good weldability.
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