Study on Microstructure and Properties of High-strength Anti-seismic Fire-resistant H Beam for Building Structure
The effects of microstructure of high-strength anti-seismic fire-resistant H beam for building structure on its strength,toughness and high temperature strength are studied with such analysis means as TEM(transmission elec-tron microscope),metallographic microscope and EBSD(electron back-scattered diffraction).The results showed that the controlled rolling and controlled cooling were not needed under the premise of reasonable chemical composition design,two-phase structure of air cooling bainite and ferrite for test steel after hot rolling was obtained.It is found by observing the microstructure after holding at 600℃for 3 hours that there is nano-level interphase precipitates in ferrite and their line spacing is about 24～34 nm.For the hot rolled high-strength anti-seismic fire-resistant H beam for building struc-ture,its yield strength≥500 MPa,elongation≥22%,yield ratio≤0.85,impact energy at-20℃≥34 J and yield strength after holding at 600℃for 3 hours≥310 MPa.
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