500Mpa fireproof and weather-resistant H steel and preparation method thereof
A H-shaped steel and refractory technology, which is applied in the field of smelting materials, can solve the problems of imperfect steel strength grades and large waste of steel materials, and achieve the effects of low cost, low yield ratio, and good high temperature resistance
Inactive Publication Date: 2019-07-05
BAOTOU IRON & STEEL GRP
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Problems solved by technology
[0004] 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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[0023] A smelting process of earthquake-resistant, weather-resistant and refractory H-shaped steel for 500MPa-level building structures: molten iron pretreatment→converter smelting→LF refining→VD vacuum refining→continuous casting billet. Corresponding technological measures shall be taken in the process of converter steelmaking, out-of-furnace refining, and continuous casting, including: controlling w[S]≤0.010% of the molten iron entering the converter, increasing the tapping temperature of the converter to about 1540°C, and controlling the amount of slag discharged from the converter , Prolonging the refining time of LF furnace and continuous casting at low casting speed, etc., to produce qualified continuous casting slabs. The heating time and refining time of LF are 25min and 45min, the argon blowing time of VD furnace is not less than 25min, the casting speed range of continuous casting machine is 0.8m / min~0.9m / min, the superheat of steel type is less than 35℃, and the spe...
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Abstract
The invention discloses 500Mpa fireproof and weather-resistant H steel. The 500Mpa fireproof and weather-resistant H steel comprises the following chemical components: 0.05-0.08% of C, 0.18-0.21% of Si, 1.2-1.3% of Mn, not greater than 0.010% of P, not greater than 0.005% of S, 0.35-0.40% of Cu, 0.36-0.39% of Cr, 0.35-0.40% of Ni, 0.05-0.08% of Nb, 0.07-0.09% of V, 0.05-0.07% of Ti, 0.27-0.31% ofMo, and 0.0015-0.0018% of B. The invention also discloses a preparation method of the 500Mpa fireproof and weather-resistant H steel. According to the method, the steel with high comprehensive performances such as intensity, shake resistance, weather resistance and fireproof performance can be produced by low-carbon microalloying; in addition, the steel has the advantages of being low in cost, lowin yield ratio and high in low-temperature toughness.
Description
technical field [0001] The invention relates to the technical field of smelting materials, in particular to a 500Mpa grade refractory and weather-resistant H-shaped steel and a preparation method thereof. Background technique [0002] As a new type of green building structure, steel structure consumes a large amount of steel, has a high rate of steel recycling, is energy-saving and environmentally friendly, and has become the leading building structure abroad. For example, the proportion of steel structures in the construction area of Japanese buildings exceeds 50%, especially the use of steel structures in low-rise buildings is very common, and the proportion of steel structures in low-rise buildings with less than 5 floors even reaches more than 90%. Steel structure residences have also become mainstream buildings in developed countries in Europe and America. The steel structure residences in developed countries such as Britain and Sweden have reached more than 40%, and ...
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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/48C22C38/46C22C38/50C22C38/44C22C38/54C21D8/00
CPCC21D8/005C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 宋振东涛雅赵晓敏白月琴周彦
Owner BAOTOU IRON & STEEL GRP