Abstract
Through the different rolling and normalizing methods to study the variation of microstructure and mechanical properties of eight groups of steels ,based on the low carbon micro alloy steel as the research object, The results show that, the main structure of steel are ferrite, bainite and a small amount of M-A island group, and granular bainite is helpful to improve the test fire resistance steel; with the increasing of normalizing temperature, the ratio of YS increased gradually, the test steel has high good fire resistance at 790 °C; the faster the cooling speed after rolling, has better fire-resistant .
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