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Low alloy weathering steel, and preparation method and application thereof

The technology of weathering steel and low alloy is applied in the field of economical industrial marine atmospheric corrosion resistant steel and its preparation field, which can solve the problem of high alloy cost, improve strength and low temperature toughness, improve atmospheric corrosion performance and low temperature toughness, and inhibit austenite The effect of bulk grain growth

Inactive Publication Date: 2017-05-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, aiming at the deficiency of high alloy cost in the development of existing low-alloy weathering steel, the present invention provides a low-alloy weathering steel and its preparation with lower cost and good corrosion resistance of low-alloy weathering steel in industrial marine atmospheric environment method

Method used

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  • Low alloy weathering steel, and preparation method and application thereof
  • Low alloy weathering steel, and preparation method and application thereof
  • Low alloy weathering steel, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A low-alloy weathering steel, its chemical composition and mass percentage content are: C: 0.045%; Si: 0.35%; Mn: 0.71%; Cu: 0.3%; Ni: 0.35%; Nb: 0.065%; Ti: 0.012% ; Al: 0.02%; P: 0.02%; S: 0.007%; the rest is Fe and unavoidable impurities.

[0036] The preparation method of the low-alloy weathering steel comprises the following steps:

[0037] Use a vacuum induction furnace to melt 200kg of molten steel with the chemical composition shown above, cast the melted steel to form a steel ingot, billet the steel ingot and hot forge it into a billet with a section of 80mm×80mm×400mm, heat the billet to 1200°C, and keep it warm 30min;

[0038] Two-stage controlled rolling is adopted, and the schematic diagram of the rolling process is as follows: figure 1 As shown, the first stage is rough rolling, the starting temperature is 1070°C, the cumulative reduction rate is 50%, and the final rolling temperature is 1000°C; the second stage is finish rolling, the starting rolling te...

Embodiment 2

[0040] A low-alloy weathering steel, its chemical composition and mass percentage content are: C: 0.03%; Si: 0.42%; Mn: 0.75%; Cu: 0.31%; Ni: 0.22%; Nb: 0.06%; Ti: 0.01% ; Al: 0.02%; P: 0.02%; S: 0.007%; the rest is Fe and unavoidable impurities.

[0041] The preparation method of the low-alloy weathering steel comprises the following steps:

[0042] Use a vacuum induction furnace to melt 200kg of molten steel with the chemical composition shown above, cast the melted steel to form a steel ingot, billet the steel ingot and hot forge it into a billet with a section of 80mm×80mm×400mm, heat the billet to 1200°C, and keep it warm 30min;

[0043] Two-stage controlled rolling is adopted, the first stage is rough rolling, the starting temperature is 1060℃, the cumulative reduction rate is 50%, and the final rolling temperature is 1000℃; the second stage is finish rolling, the starting temperature is 950℃, and the final rolling temperature is 1000℃. The temperature is 830°C, the cu...

Embodiment 3

[0045] A low-alloy weathering steel, its chemical composition and mass percentage content are: C: 0.037%; Si: 0.48%; Mn: 0.69%; Cu: 0.32%; Ni: 0.21%; Nb: 0.064%; Ti: 0.01% ; Al: 0.02%; P: 0.016%; S: 0.001%; ​​the rest is Fe and unavoidable impurities.

[0046] The preparation method of the low-alloy weathering steel comprises the following steps:

[0047] Use a vacuum induction furnace to melt 200kg of molten steel with the chemical composition shown above, cast the melted steel to form a steel ingot, billet the steel ingot and hot forge it into a billet with a section of 80mm×80mm×400mm, heat the billet to 1200°C, and keep it warm 30min;

[0048] Two-stage controlled rolling is adopted. The first stage is rough rolling, the starting temperature is 1065°C, the cumulative reduction rate is 50%, and the final rolling temperature is 1000°C; the second stage is finish rolling, the starting temperature is 950°C, and the final rolling temperature is 1000°C. The temperature is 850°...

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Abstract

The invention provides a low alloy weathering steel. The low alloy weathering steel contains chemical components by following weight percentage: 0..02-0.05% of C, 0.6-1% of Mn, 0.2-0.4% of Cu, 15-0.5% of Ni, 0.04-0.07% of Nb, 0.005-0.015% of Ti, 0.3-0.6% of Si, <= 0.02% of Al, <=0.02% of P, <=0.08% of S and the balance of Fe and inevitable impurities. The low alloy weathering steel reduces usage amount of the high cost alloy elements of Cr and Ni by improving content of the low cost alloy element of Si, and adopts synergistic effects among the alloy elements to reduce usage of the high cost alloy elements and achieve maximization of cost effectiveness. Simultaneously, the low alloy weathering steel has good comprehensive mechanical properties, and is suitable for application requirements of bridges and the like under industrial marine atmospheric environment.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to an economical industrial marine atmospheric corrosion-resistant steel and its preparation method and application. Background technique [0002] With the development of resource-saving and environment-friendly society in our country, the weather resistance of bridge steel has been paid more and more attention. The development of weather-resistant bridge steel can not only prolong the overall service life of the bridge, but also reduce the total cost during the service life of the bridge. The coastline of my country's mainland is as long as 18,000km, and the coastal areas are usually economically developed areas. With the rapid development of bridge construction in these areas, especially the construction of cross-sea bridges, the construction of various bridges has also driven the demand for bridge steel. While these projects have increased the demand for ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/60C21D8/02
CPCC22C38/04C21D8/0226C22C38/002C22C38/02C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/60
Inventor 付贵勤李东亮朱苗勇贾雄飞
Owner NORTHEASTERN UNIV
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