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Production method of bridge weathering steel with optimized alloy components

A production method and technology of alloy composition, applied in metal rolling, temperature control, etc., can solve the problems of high processing cost, high use cost of alloy elements, and rising user cost.

Inactive Publication Date: 2021-08-10
XINJIANG BAYI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Research on weathering steel for bridges in China has been carried out, but the use of alloying elements is different. According to relevant information, the cost of using alloying elements is generally high, resulting in high processing costs and increasing user costs.

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  • Production method of bridge weathering steel with optimized alloy components
  • Production method of bridge weathering steel with optimized alloy components
  • Production method of bridge weathering steel with optimized alloy components

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Embodiment Construction

[0013] A method for producing bridge weathering steel with optimized alloy composition, comprising the following two steps: 1. The mass percentage of alloy components: C 0.05%, Si 0.3%, Mn 1.2%, Nb 0.025%, V 0.08%, Ti 0.01%, Cr 0.45%, Ni 0.33%, Cu 0.3%, Mo 0.06%, N 0.005%, Als 0.03%, the balance is iron and impurities; 2. Medium and heavy plate rolling process: steelmaking and smelting according to the design alloy element requirements The thickness of the billet is 250mm, the width is 1800mm, and the length is 2450mm~3470mm. After that, it needs to be rolled on the middle plate to make a finished product with a specification of 12~20mm: 1) Heating system design: heating furnace temperature 1140°C, rough rolling temperature 1050°C , Finish rolling temperature is 790°C, and temperature of turning red is 640°C; 2) Rough rolling process design, the rough rolling mill is a single-stand reversible rolling mill, and the negative value of the speed is the speed in the reverse rolling ...

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Abstract

The invention discloses a production method of bridge weathering steel with optimized alloy components. The production method comprises the following two steps that 1, the alloy components are in percentage by mass: 0.05% of C, 0.3% of Si, 1.2% of Mn, 0.025% of Nb, 0.08% of V, 0.01% of Ti, 0.45% of Cr, 0.33% of Ni, 0.3% of Cu, 0.06% of Mo, 0.005% of N, 0.03% of Als and the balance iron and impurities; and 2, a medium-thick plate rolling process is carried out, specifically, after a qualified blank with the thickness of 250mm, the width of 1800mm and the length of 2450mm-3470mm is smelted by steelmaking according to design alloy element requirements, the blank is rolled on the medium plate into a finished product with the specification of 12-20mm: (1) heating system design: the temperature of a heating furnace is 1140 DEG C, the rough rolling temperature is 1050 DEG C, the finish rolling temperature is 790 DEG C and the self-tempering temperature is 640 DEG C, and (2) rough rolling and finish rolling are carried out to obtain the finished product.

Description

technical field [0001] The invention relates to a method for producing bridge weathering steel with optimized alloy composition. Background technique [0002] Weather-resistant steel refers to low-alloy steel that is resistant to atmospheric corrosion by adding a small amount of alloy elements. Weather-resistant steel for bridges is generally low-phosphorus welded structural steel with a content of less than 0.04%, and a protective rust layer can be formed on the surface, which can Effectively block the infiltration and transmission of corrosive media, the atmospheric corrosion resistance of weathering steel is 2-8 times that of ordinary carbon steel, and the longer the use time, the more prominent the weathering effect. Weathering steel can be used to manufacture steel structures such as vehicles, bridges, towers, and containers. Domestic research on bridge weathering steel has been carried out, but the use of alloying elements is different. According to relevant informati...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C38/46C22C38/50C22C38/42C22C38/44C22C38/06C22C33/04B21B37/74B21B1/34
CPCB21B1/34B21B37/74C22C33/04C22C38/001C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 马占福陈晓山
Owner XINJIANG BAYI IRON & STEEL
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