Polyphase microstructure quake-proof weather-resistant and fireproof H profile steel and preparation method thereof

Abstract

The invention discloses polyphase microstructure quake-proof weather-resistant and fireproof H profile steel and a preparation method thereof and belongs to the fields of smelting techniques and rolling techniques. The polyphase microstructure quake-proof weather-resistant and fireproof H profile steel comprises the chemical components in percent by weight: 0.06-0.08% of C, 0.18-0.20% of Si, 1.2-1.4% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.40-0.44% of Cu, 0.28-0.31% of Cr, 0.28-0.31% of Ni, 0.02-0.05% of Nb, 0.04-0.07% of V, 0.07-0010% of Ti, 0.24-0.28% of Mo, 0.0013-0.0015% of B and the balance Fe and inevitable impurities. The polyphase microstructure quake-proof weather-resistant and fireproof H profile steel produced by low carbon microalloying islow in cost, low in yield ratio and better in low-temperature toughness.

Description

technical field [0001] The invention belongs to the fields of smelting technology and rolling technology, and particularly relates to a multiphase microstructure shock-resistant, weather-resistant and fire-resistant H-beam and a preparation method thereof. Background technique [0002] As a new type of green building structure, steel structure has a large amount of steel, high steel recycling rate, energy saving and environmental protection, and has become the leading building structure abroad. For example, the proportion of steel structure in the construction area of ​​Japan is more than 50%, especially the use of steel structure in low-rise buildings is very common, and the proportion of steel structure in low-rise buildings with less than 5 floors even reaches more than 90%. Steel structure houses have also become mainstream buildings in developed countries in Europe and the United States. The steel structure houses in developed countries such as the United Kingdom and Sw...

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Problems solved by technology

[0003] Domestic construction steel generally uses Q235 and Q345. Although the GB / T19879 "Steel Plates for Building Structures" standard expands the steel types from Q235GJ and Q345GJ series to Q235GJ, Q345GJ, Q390GJ, Q420GJ and Q460GJ series, domestic construction steel is still in the The Q345GJ series is the main one. In the process of building a two-oriented society, the current situation of imperfect steel strength grades and large steel waste needs to be changed urgently.

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