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Weathering steel

A technology of weathering steel and weight percentage, which is applied in the field of weathering steel and can solve the problem of high cost

Inactive Publication Date: 2012-09-26
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The task of the present invention is to provide a kind of weather-resistant steel that solves the problem of high cost by reducing the nickel content under the premise of unchanged mechanics and corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0010] The weather-resistant steel proposed by the present invention is smelted by ladle refining furnace, namely LF furnace, or the weather-resistant steel proposed by the present invention is refined by the combination of LF furnace and RH vacuum circulation degassing method, and the alloy feeding system arranged above the LF furnace is used to refine the weather-resistant steel proposed by the present invention. Add fine-tuning alloys to the LF furnace, and make the percentage by weight of each trace alloy in molten steel be: manganese 0.36%; nitrogen 0.005%; chromium 0.45%; phosphorus 0.070%; copper 0.25%; nickel 0.11%; unavoidable impurities. Impurities include: 0.44% silicon; 0.008% sulfur; 0.12% carbon.

Embodiment 2

[0012] Refining weathering steel according to the method of embodiment 1, and make the percentage by weight of each trace alloy in molten steel be: manganese 0.40%; Nitrogen 0.004%; Chromium 0.60%; Phosphorous 0.105%; Copper 0.32%; Nickel 0.13%; Iron and unavoidable impurities. Impurities include: 0.25% silicon; 0.007% sulfur; 0.06% carbon.

Embodiment 3

[0014] Refining high weathering steel according to the method of embodiment 1, and make the percentage by weight of each trace alloy in molten steel be: manganese 0.50%; Nitrogen 0.004%; Chromium 0.50%; Phosphorus 0.095%; Copper 0.28%; Nickel 0.12%; Surplus For iron and unavoidable impurities. Impurities include: 0.25% silicon; 0.007% sulfur; 0.06% carbon.

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Abstract

The invention relates to a weathering steel which is characterized by comprising the following materials by weight percentage: 0.36-0.50% of manganese, 0.45-0.60% of chromium, 0.11-0.13% of nickel, 0.25-0.32% of copper, 0.005% or less of nitrogen, 0.070-0.105% of phosphorus, and the balance being iron and unavoidable impurities. Although the weathering steel contains relatively less nickel, the weathering steel is protected from hot embrittlement, and the surface of the steel is prevented from crackle forming.

Description

technical field [0001] The invention relates to a weathering steel. Background technique [0002] Weathering steel is a kind of structural steel resistant to atmospheric corrosion, which is widely used in the manufacture of vehicles, containers, bridge towers and other fields. In the prior art, it is generally believed that this kind of steel contains alloying elements such as copper, phosphorus, chromium, nickel, etc., so that the steel can form a layer of dense amorphous spinel between the rust layer and the matrix and has good adhesion to the matrix metal. Stone oxide layer. Since copper can activate the cathode in the process of atmospheric corrosion, promote the anode passivation of steel, thereby slowing down the corrosion of air, so the existing weathering steel is added with 0.30% copper by weight. However, because copper can form a copper-rich layer on the steel surface when it is heated in an oxidizing atmosphere, when the copper reaches the melting temperature, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42
Inventor 文小明赵科赵迪刘志璞崔洪涛
Owner BENGANG STEEL PLATES
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