Coating-free weathering resistant steel with few welding seam inclusions and preparation method thereof

A weather-resistant steel and coating-free technology, applied in the field of weather-resistant steel, can solve the problems of poor low-temperature toughness, lowering, and many inclusions, and achieve the effects of improving welding metallurgical quality, atmospheric corrosion resistance, and reducing the number of inclusions

Active Publication Date: 2018-10-12
YANSHAN UNIV
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Problems solved by technology

[0006] In order to solve the technical problems of many weld inclusions and poor low-temperature toughness of weathering steel, the invention provides a coating-free weathering steel with less weld inclusions and a preparation method thereof. By optimizing the content ratio of chemical components, optimizing Si, Ca, so that it transitions to the weld to better control the metallurgical reaction of the molten pool, and realizes a great reduction of inclusions in the welding seam of the coating-free weathering steel

Method used

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  • Coating-free weathering resistant steel with few welding seam inclusions and preparation method thereof
  • Coating-free weathering resistant steel with few welding seam inclusions and preparation method thereof
  • Coating-free weathering resistant steel with few welding seam inclusions and preparation method thereof

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preparation example Construction

[0059] 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:

[0060] (1) Smelting molten steel: The molten steel melted from the blast furnace flows into the pretreatment reaction tank divided into the desulfurization pretreatment section, the desiliconization pretreatment section and the dephosphorization pretreatment section by the skimmer, and the three pretreatment sections spray Blow in the corresponding desulfurizing agent, desiliconizing agent, and dephosphorizing agent, and stir for pretreatment, and then smelt with electric arc furnace or converter at a temperature of 1500~1650°C to obtain molten steel. Among them, the converter adopts double slag mode for dephosphorization, 55%-65wt.% of the slag is added in the early stage, and when the blowing cycle of the oxygen lance reaches 20%-30%...

Embodiment 2

[0079] In Example 2, the number of inclusions in the unit field of view of the weld continues to decrease to 10, which is equivalent to an average number of about 170 in each square millimeter area. Compared with Comparative Example 1, the decrease rate is 60%, and the quality of the weld continues. improve.

Embodiment 3

[0080] In Example 3, the number of inclusions in the unit field of view of the weld is further reduced to 7, which is equivalent to an average number of about 120 per square millimeter, a decrease rate of 72%, and the quality of the weld is greatly improved.

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Abstract

The invention provides a coating-free weathering resistant steel with few welding seam inclusions and a preparation method thereof, and belongs to the technical field of weathering resistant steels. According to the technical scheme, the coating-free weathering resistant steel with the few welding seam inclusion is characterized in that the content and mixing ratio of chemical components are optimized; the contents of Si, Mn, Ni, Cr, Cu, Mo and Ca in the weathering resistant steel are optimized, and the mixing ratio of the elements meets that J ranges from 1.2 to 1.7, and J is the ratio of (Si+Mn+50Ca) to (Cr+Ni+Cu+Mo). The coating-free weathering resistant steel with the few welding seam inclusions has the beneficial effects that the quantity of inclusions of various welding seams is obviously decreased, and the size of the inclusions decreases during the welding of the weathering resistant steel, thus the welding seam crack tendency caused by big inclusion obviously decreases, and the welding metallurgical quality is greatly improved, and as a result, the nondestructive inspection qualification rate is increased; the weathering resistant steel is resistant to atmosphere corrosionand remains outstanding mechanical performance and is applicable to board and section production with general industrial processes; and moreover, the cost is low.

Description

technical field [0001] The invention belongs to the technical field of weathering steel, and in particular relates to a coating-free weathering steel with less welding seam inclusions 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, the requirements for the comprehensive performance of special bridge steel materials are getting higher and higher. Due to its good weather resistance and mechanical properties, weathering steel has been widely used in the construction of coating-free weathering steel bridges. As a new type of steel bridge with green and efficient manufacturing technology, the coating-free weather-resistant steel bridge has the advantages of reduced life cycle cost, shortened manufacturing period, reduced release of harmful organic substances, and brown appearan...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C22C38/50C22C38/46C22C38/06C21C7/076C21C7/10C21D8/02
CPCC21C7/076C21C7/10C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50Y02P10/20
Inventor 王青峰曲晓敏张春玲胡兵张月孙瑞
Owner YANSHAN UNIV
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