Preparation method of Q420-grade hot-rolling weather-resistant angle steel

An angle steel and weather-resistant technology, applied in the field of metallurgy, can solve the problems of increased cost, cracking, weather-resistant cold-formed angle steel transmission towers cannot be deployed on a large scale, and achieve the effect of offsetting harmful effects

Inactive Publication Date: 2018-06-05
CHONGQING YUHUANG ELECTRIC POWER EQUIP MFG
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Such defects make the steel plate affected in the subsequent use process, and its corrosion resistance and welding performance are reduced
Another type of defect is 90° cold-bending cracking. After the hot-rolled weather-resistant steel plate is cold-bent and deformed, cracks appear at the corners, which makes the weather-resistant cold-formed angle steel transmission tower unable to be deployed on a large scale.
In addition, it needs to go through the cold forming process, which increases the cost, and it is difficult to cold form large-size angle steel

Method used

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  • Preparation method of Q420-grade hot-rolling weather-resistant angle steel
  • Preparation method of Q420-grade hot-rolling weather-resistant angle steel
  • Preparation method of Q420-grade hot-rolling weather-resistant angle steel

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preparation example Construction

[0024] The invention provides a preparation method of Q420 grade hot-rolled weather-resistant angle steel, comprising the following steps:

[0025] Steel billet smelting: steel billets are made by deep desulfurization of molten iron, converter smelting, slag-retaining tapping and argon blowing. During the smelting process, fine grained alloy elements are added to the billets.

[0026] Billet rolling: start rolling temperature ≥ 1120°C, finish rolling temperature: 800°C-840°C;

[0027] Billet cooling: the cooling method is air cooling to obtain Q420 hot-rolled weather-resistant angle steel;

[0028] Straightening angle steel: straightening temperature ≤ 60 ℃.

[0029] Wherein, the billet pressing step includes a rough rolling stage and a finish rolling stage.

[0030] The high-temperature recrystallization zone rolling in the rough rolling stage is mainly to obtain uniformly refined austenite grains through repeated rolling and repeated recrystallization of the heated and coa...

Embodiment 1

[0039] The normal temperature tensile test results of the angle steel made by embodiment 1 and embodiment 2 are shown in table 2

[0040]

[0041] Table 2

[0042] The angle steel impact test results of two embodiments are shown in Table 3

[0043]

[0044] table 3

[0045] The angle steel bending test results of two embodiments are shown in Table 4

[0046]

[0047] Table 4

[0048] The angle steel metallographic structure of two embodiments is shown in Table 5

[0049] Sample serial number

[0050] table 5

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PUM

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Abstract

The invention relates to a preparation method of Q420-grade hot-rolling weather-resistant angle steel. The preparation method of the Q420-grade hot-rolling weather-resistant angle steel comprises thefollowing steps: smelting a steel billet, rolling the steel billet, cooling the steel billet and straightening the angle steel. The Q420-grade hot-rolling weather-resistant angle steel can be producedon a large scale for use of a power transmission line iron tower.

Description

technical field [0001] The invention relates to a preparation method of Q420 grade hot-rolled weather-resistant angle steel, which belongs to the field of metallurgy. Background technique [0002] For a long time, my country's transmission line towers have mainly used hot-rolled angle steel profiles, supplemented by a small amount of steel pipes as tower materials. The main types of steel materials are Q235B, Q345B / C and Q420B / C. In recent years, under the vigorous promotion of the State Grid Corporation of China, high-strength steel and steel pipe towers have been widely used in transmission line towers, and the application of high-strength bolts, cold-formed steel and composite materials has also entered the stage of gradual exploration and use. During the manufacturing process of transmission towers made of carbon steel and low-alloy structural steel, hot-dip galvanizing is used for anti-corrosion. Galvanized anti-corrosion requires special rust removal, pickling, and ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/42C22C38/48C22C38/46C22C38/50C22C38/06C21C1/02C21C7/064
CPCC22C33/04C21C1/02C21C7/064C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50
Inventor 刘蜀宇张黎符必川
Owner CHONGQING YUHUANG ELECTRIC POWER EQUIP MFG
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