Preparation method for high-strength weather-resistant steel for 800Mpa power transmission tower

A technology for transmission towers and weathering steels, which is applied in the field of preparation of high-strength weathering steels for 800Mpa transmission towers, can solve the problems of complex preparation process of hot-dip galvanized layer, high cost of anti-corrosion maintenance, serious environmental pollution, etc., and achieve simple and feasible hot rolling process , the preparation process and the required equipment are simple, and the effect of wide application prospects

Inactive Publication Date: 2017-05-31
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of high raw material cost of weathering steel in the prior art, complex preparation process of hot-dip galvanized layer, high cost of anti-corrosion and maintenance in the later period, and serious environmental pollution, etc., and propose a preparation of high-strength weathering steel for 800Mpa transmission towers The method, which optimizes the composition of weathering steel, adopts the preparation method of high temperature soaking, high temperature final rolling, high temperature coiling and controlled rolling and controlled cooling to produce a weathering steel with low cost, less pollution, simple preparation process and high corrosion resistance

Method used

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  • Preparation method for high-strength weather-resistant steel for 800Mpa power transmission tower
  • Preparation method for high-strength weather-resistant steel for 800Mpa power transmission tower
  • Preparation method for high-strength weather-resistant steel for 800Mpa power transmission tower

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Embodiment 1

[0031] The weathering steel of the present invention is prepared from the following components by weight percentage: C, 0.14%; Si, 1.9%; Mn, 1.2%; P, 0.011%; S, 0.003%; Al, 0.5%; N, 0.0032 %; O, 0.002%; the balance is Fe and trace impurities.

[0032] The weathering steel preparation process steps are as follows:

[0033] 1) Converter or electric furnace smelting; 2) LF refining; 3) Continuous casting; 4) High-temperature heating furnace heating: the billet is heated to 1320°C, the holding time is controlled according to the effective thickness of weathering steel 2.0min / mm, and the initial slab thickness is 80mm, the holding time is 160min; 5) Rough rolling: the thickness of the weathering steel intermediate billet is 10 times the thickness of the finished product (33mm); 6) High temperature finishing rolling: the thickness of the weathering steel intermediate billet is 10 times the thickness of the finished product (33mm), among which, Finish rolling entrance temperature 98...

Embodiment 2

[0035] The weathering steel of the present invention is prepared from the following components by weight percentage: C, 0.17%; Si, 1.0%; Mn, 1.3%; P, 0.012%; S, 0.002%; Al, 0.7%; N, 0.0040 %; O, 0.002%; the balance is Fe and trace impurities.

[0036] The weathering steel preparation process steps are as follows:

[0037]1) Converter or electric furnace smelting; 2) LF refining; 3) Continuous casting; 4) High-temperature heating furnace heating: heat the billet to 1330°C, the holding time is controlled according to the effective thickness of weathering steel 2.0min / mm, and the initial slab thickness is 80mm, the holding time is 160min; 5) Rough rolling: the thickness of the weathering steel intermediate billet is 11 times the thickness of the finished product (32mm); 6) High temperature finish rolling: the thickness of the weathering steel intermediate billet is 11 times the thickness of the finished product (32mm), among which, Finish rolling entrance temperature 980℃, finis...

Embodiment 3

[0039] The weathering steel of the present invention is prepared from the following components by weight percentage: C, 0.18%; Si, 1.1%; Mn, 1.4%; P, 0.013%; S, 0.003%; Al, 0.9%; N, 0.0028 %; O, 0.001%; ​​the balance is Fe and trace impurities.

[0040] The weathering steel preparation process steps are as follows:

[0041] 1) Converter or electric furnace smelting; 2) RH vacuum treatment; 3) Continuous casting; 4) High-temperature heating furnace heating: heating the billet to 1340°C, the holding time is controlled according to the effective thickness of weathering steel 2.0min / mm, the initial slab thickness 5) Rough rolling: the thickness of the weathering steel intermediate billet is 10 times the thickness of the finished product (35mm); 6) High temperature finish rolling: the thickness of the weathering steel intermediate billet is 10 times the thickness of the finished product (35mm), of which , the finish rolling entrance temperature is 1000°C, the final rolling tempera...

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Abstract

The invention provides a preparation method for high-strength weather-resistant steel for an 800Mpa power transmission tower. The components of weather-resistant steel are optimized, and the weather-resistant steel which is low in cost, low in pollution, simple in preparation process, high in strength and high in corrosion resistance is produced through the preparation method comprising high-temperature soaking, high-temperature final rolling, high-temperature coiling, and controlled rolling and controlled cooling. The economic cost is more than 25% lower than the cost of common weather-resistant steel; the yield strength achieves 769MPa, the tensile strength achieves 857Mpa, the total elongation is 20.9%, the impact energy at -40 DEG C is 44J, and the cold-bending property is qualified; excellent corrosion resistance is achieved, wherein the highest values of Rt and Rrust can achieve 1150 ohm.cm2 and 63 ohm.cm2 respectively; and the weather-resistant steel prepared by the preparation method provided by the invention can be popularized and used in ultra-high-voltage engineering in the power transmission industry, effectively saves energy and reduces emission, and plays a remarkable role on reduction for the cost of raw materials and the later-period maintenance cost of the tower.

Description

technical field [0001] The invention relates to a preparation method of weather-resistant steel, in particular to a preparation method of high-strength weather-resistant steel for 800Mpa transmission towers. Background technique [0002] Strong corrosive gases such as sulfides and nitrogen oxides emitted by industrial waste gas severely corrode transmission line towers exposed to the atmosphere for a long time, and anticorrosion treatment needs to be carried out every two years. The loss was severe. [0003] In the development of atmospheric corrosion-resistant steel, the common practice at home and abroad is to add a certain amount of corrosion-resistant elements, such as Cr, Ni, Mo, Cu, etc., to the steel, while minimizing the harmful element S content in the steel. The corrosion resistance of steel is basically the effect of the above-mentioned corrosion-resistant elements, but the above-mentioned alloy elements are expensive, especially Ni, Mo, etc., which increase the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/00
CPCC21D8/005C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 黄耀韩军科邢海军杨风利王旭明
Owner CHINA ELECTRIC POWER RES INST
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