Rare earth element-containing uncoated weather-resistant steel and preparation method thereof

A rare earth element and weathering steel technology, used in the field of weathering steel, can solve the problems of poor low temperature toughness, many inclusions in welds, and low strength.

Active Publication Date: 2019-01-22
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the technical problems of many inclusions, low strength, and poor low-temperature toughness in weathering steel welds, the present invention provides a coating-free weathering steel containing rare earth elements and a preparation method thereof. By optimizing the content ratio of chemical components, Further add appropriate amount of Y and Mo to make it transition to the weld to better control the metallurgical reaction of the molten pool, realize the excellent weather resistance and mechanical properties of the coating-free weathering steel, and greatly reduce the inclusions in the weld

Method used

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  • Rare earth element-containing uncoated weather-resistant steel and preparation method thereof
  • Rare earth element-containing uncoated weather-resistant steel and preparation method thereof
  • Rare earth element-containing uncoated weather-resistant steel and preparation method thereof

Examples

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preparation example Construction

[0054] The preparation method of the steel plate is as follows, sequentially undergoing smelting, refining, continuous casting, thermomechanical rolling and tempering treatment. Specifically, the preparation method includes the following steps:

[0055] (1) Smelting molten iron: The molten iron melted from the blast furnace flows into the pretreatment reaction tank which is divided into the desulfurization pretreatment section, desiliconization pretreatment section and dephosphorization pretreatment section by the skimmer. Inject the corresponding desulfurization agent (such as: metal magnesium, soda and / or lime), desiliconization agent (such as: iron phosphorus and / or lime), dephosphorization agent (such as: fluorite and / or calcium chloride), and Stirring, pretreatment, and then smelting with an electric arc furnace or converter at a temperature of 1500~1600°C to obtain molten iron.

[0056](2) LF furnace refining: This step is used for deep desulfurization, heating and fine-...

Embodiment 2

[0073] In Example 2, the number of inclusions in the unit field of view of the weld continued to decrease to 10, compared with Comparative Example 1, the reduction rate was 76%, and the quality of the weld continued to improve. Compared with Example 1, the number of inclusions is less, the size of inclusions is smaller, and the welding quality is better.

Embodiment 3

[0074] In Example 3, the number of inclusions in the unit field of view of the weld is further reduced to 7. Compared with Examples 1 and 2, the number of inclusions is further reduced and the size is further reduced, and the welding quality is further improved.

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Abstract

The invention provides a rare earth element-containing uncoated weather-resistant steel and a preparation method thereof, and belongs to the technical field of weather-resistant steels. The respectivecontent and the ratio of chemical components Cr, Ni, Cu, Mo, Re and Ca are optimized to control the X value to be equal to or more than 0.3 and equal to or less than 1.0, where X is a ratio of (20 Re+ 50 Ca) to (1.5 Cr + Ni + Cu + 1.2 Mo). The weather-resistant steel has the advantages of significant reduction of the number of inclusions of various welds, significant reduction of the size of thewelds, significant reduction of the crack tendency of the welds, great improvement of the quality of welding metallurgy and improvement of the flaw detection qualified rate when welded; and appropriate amounts of Si, Ni, Cr and Cu are added to make the atmospheric corrosion resistance index I to be equal to or more than 6.5, and addition of appropriate amounts of Y and Mo improves the weather resistance, so the wear-resistant steel has good resistance to the atmospheric corrosion and maintains excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of weathering steel, and in particular relates to a coating-free weathering steel containing rare earth elements and a preparation method thereof, and is especially suitable for coating-free weathering steel for welded structures. Background technique [0002] With the development of steel bridge design and manufacturing technology in my country's bridge industry, various long-span steel structure bridges that cross seas, rivers, and canyons have higher and higher requirements for the comprehensive performance of special bridge steel materials. Weather-resistant bridge steel has good atmospheric corrosion resistance, can be used without coating, and also has excellent comprehensive mechanical properties, which can meet the safety, economy, durability and environmental protection requirements of long-span steel bridges, and has gradually been widely used It is a new type of steel with green and efficient manu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C21D8/02C22C33/04
CPCC21D8/0205C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50
Inventor 王青峰白福臣胡兵闫旭强董汪越何江里
Owner YANSHAN UNIV
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