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Production method of low yield strength ratio refactory hot continuously-rolled strip for building

A low-yield-ratio, hot-rolled strip steel technology is applied in the field of manufacturing steel structure materials for construction, which can solve problems such as poor fire resistance and achieve good welding performance

Inactive Publication Date: 2005-11-02
NORTHEASTERN UNIV
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Problems solved by technology

Now, the patent that has been reported as Japan's Nippon Iron and Steel Company application, patent number: JP2000256791, date of application: 2000-09-19, title is called: disclosed in Low yield ratio type fire resistant hot rolled steel sheet and its production 400MPa, 490MPa low yield ratio strip steel, the chemical composition of the steel is: 0.01~0.1C, 0.05~0.8Si, 0.5~1.5Mn, 0.3~1.5Mo, 0.005~0.05Nb, 0.02~0.1V , 0.0003~0.0025B. The yield ratio of this product is less than 0.8, and the weldability is good, but the fire resistance function is poor, σ s(600℃) / σ s(室温) <2 / 3

Method used

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Embodiment Construction

[0014] Table 1 lists the chemical composition selected for the actual production of 400MPa and 490MPa steel strips. Table 2 and Table 3 are the controlled rolling and controlled cooling process and mechanical performance inspection results under this chemical composition. The product is hot continuous rolled strip steel with a thickness of 8mm, the heating temperature is 1200°C, and the rolling start temperature is 1100°C.

[0015]

[0016] steel

[0017] steel

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PUM

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Abstract

The present invention relates to a building low yield ratio refractory hot-continuously rolled strip steel and its production method. The method includes the following steps: firstly, using billet with different chemical component, heating, controlled temp. is 1200-1220 deg.C, roughing down, finishing rolling, final rolling temp. is controlled in 820-940 deg.C, laminar cooling, and it is backward cooling, cooling speed is 20 deg.c / s, finally coiling, coiling temp. is 400-600 deg.C, so that two kinds of low yield ratio refractory hot-continuously-rolled strip steels with 400 MPa and 490 MPa grades can be obtained.

Description

technical field [0001] The invention relates to a method for manufacturing steel structure materials for construction, in particular to a method for manufacturing a low-yield-ratio refractory hot-rolled steel strip for construction. Background technique [0002] In modern building structures, steel structure buildings represent the new trend of today's development. The reason for its rapid development is that it has the advantages of light structure, large space, industrialized production, shortened construction period by half and energy saving by 50%. In order to meet the requirements of earthquake resistance, the yield strength ratio (σ s / σ b )<0.8, and it is required to have fire resistance and good welding performance. However, the yield strength of ordinary buildings in the prior art drops sharply at a high temperature above 350°C, which is lower than 2 / 3 of the strength at room temperature, which cannot meet the design requirements. In order to prevent fire from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/26
Inventor 王昭东于庆波刘相华王国栋
Owner NORTHEASTERN UNIV