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Structural steel for construction with yield strength higher than 630mpa and preparation method thereof

A yield strength, 630mpa technology, applied in the field of high-strength construction steel production, can solve the problems of increased yield ratio, material waste, loss of strength, etc., to achieve uniform load and deformation, small fluctuation of yield strength, and improved plastic deformation capacity. Effect

Inactive Publication Date: 2017-05-24
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the yield ratio is too low, it will inevitably lose strength and cause waste of materials, and simply increasing the strength will increase the yield ratio. Therefore, reasonable strength, toughness and plasticity are the guarantees for improving the overload resistance of construction steel.

Method used

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  • Structural steel for construction with yield strength higher than 630mpa and preparation method thereof
  • Structural steel for construction with yield strength higher than 630mpa and preparation method thereof
  • Structural steel for construction with yield strength higher than 630mpa and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The structural steel of this embodiment has adopted following design:

[0038] The chemical composition and mass percentage of steel are: C0.087%, Si0.13%, Mn1.47%, P0.010%, S0.005%, V0.052%, Nb0.025%, Ti0.015% , Cr0.42%, B0.0014%, the balance is Fe and unavoidable impurity elements.

[0039] The method for preparing the structural steel with the above-mentioned compositional design comprises the following steps:

[0040] (1) Smelting, refining and continuous casting: the raw materials are configured according to the above chemical composition, and continuous casting slabs are obtained by adopting converter smelting, external refining and continuous casting processes.

[0041] (2) Heating: Heating the continuous casting slab to 1210°C, holding it for 90 minutes to obtain the heated slab, austenitizing the slab and avoiding coarse austenite grains caused by excessive heating. And ensure uniform austenitization of the billet.

[0042] (3) Rolling: The heated slab is su...

Embodiment 2

[0045] Embodiment 2: The structural steel of this embodiment adopts the following design:

[0046] The mass ratio of each chemical composition is: C0.11%, Si0.12%, Mn1.50%, P0.012%, S0.003%, V0.06%, Nb0.0275%, Ti0.018%, Cr0. 406%, B0.001%, the balance is Fe and unavoidable impurity elements.

[0047] The method for preparing the structural steel with the above-mentioned compositional design comprises the following steps:

[0048] (1) Smelting: According to the above chemical composition, the raw materials are configured, and the slab is obtained through converter smelting, external refining, and continuous casting.

[0049] (2) Heating: heat the slab obtained through the casting step, heat the slab to 1210°C, and keep it warm for 100 minutes to obtain the heated slab, so as to austenitize the slab and avoid austenitization caused by excessive heating. Coarse tenite grains ensure uniform austenitization of the slab.

[0050] (3) Rolling: The heated slab obtained through the ...

Embodiment 3

[0053] Embodiment 3: The structural steel of this embodiment adopts the following design:

[0054] The mass ratio of each chemical composition is: C0.09%, Si0.14%, Mn1.60%, P0.009%, S0.002%, V0.06%, Nb0.03%, Ti0.02%, Cr0. 42%, B0.001%, the balance is Fe and unavoidable impurity elements.

[0055] The method for preparing the structural steel with the above-mentioned compositional design comprises the following steps:

[0056] (1) Smelting: According to the above chemical composition, the raw materials are configured, and the slab is obtained through converter smelting, external refining, and continuous casting.

[0057] (2) Heating: heat the slab obtained through the casting step, heat the slab to 1220°C, and keep it warm for 100 minutes to obtain the heated slab, so as to austenitize the slab and avoid austenitization caused by excessive heating. Coarse tenite grains ensure uniform austenitization of the slab.

[0058] (3) Rolling: The heated cast slab obtained through the...

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Abstract

The invention provides structural steel with the yield strength being over 630 MPa for buildings. The structural steel is prepared from, by mass, 0.07%-0.12% of C, 0.1%-0.25% of Si, 1.3%-1.6% of Mn, 0%-0.015% of P, 0%-0.010% of S, 0.04%-0.06% of V, 0.02%-0.04% of Nb, 0.015%-0.03% of Ti, 0.4%-0.6% of Cr, 0.001%-0.003% of B and the balance Fe and inevitable impurity elements. The structural steel can bear large loads, the roughness and plasticity of the structural steel are well matched, the requirement for overload resistance of the structural steel for the buildings is met, the fluctuation of the yield strength of the structural steel is small, the load and deformation between steel structures are even, the overall plastic deformation capacity of the structural steel is improved, and the anti-seismic safety can be improved easily.

Description

technical field [0001] The invention relates to the field of high-strength construction steel production, in particular to a construction structural steel with a yield strength higher than 630 MPa and a preparation method thereof. Background technique [0002] Since the steel structure meets the requirements for the development of land-saving and energy-saving buildings and the sustainable development of the low-carbon economy, it can give full play to its own advantages in high-rise buildings, long-span space structures, transportation energy projects, and residential buildings. At present, steel structures in the United States, Japan and other countries The amount of steel used in structures has exceeded 35% of steel consumption, and the building area of ​​steel structures has exceeded 40% of the total building area; while the proportion of steel used in steel structures in general countries has reached about 10%. However, my country's steel structure construction steel ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/32C21D8/02
Inventor 许磊历长云王有超刘宏强钟金红宋庆吉米国发王狂飞刘晨易善伟
Owner HENAN POLYTECHNIC UNIV
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