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Ca-containing low-ally weathering-resistant steel and preparation method and application thereof

A weathering steel and low-alloy technology, used in buildings, bridges, bridge parts, etc., can solve the problem of high alloy cost, and achieve the effects of improving corrosion resistance, weather resistance, and strength.

Active Publication Date: 2017-04-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 with lower cost and guaranteed good corrosion resistance of low-alloy weathering steel in industrial marine atmospheric environment and its preparation method

Method used

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  • Ca-containing low-ally weathering-resistant steel and preparation method and application thereof
  • Ca-containing low-ally weathering-resistant steel and preparation method and application thereof
  • Ca-containing low-ally weathering-resistant steel and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0034] A low-alloy weathering steel containing Ca, its chemical composition and mass percentage content are: C: 0.03%; Si: 0.22%; Mn: 0.75%; Cu: 0.31%; Ni: 0.22%; Nb: 0.06%; Ti: 0.01%; P: 0.02%; S: 0.007%; Ca: 0.001%; ​​the rest is Fe and unavoidable impurities.

[0035] The preparation method of the Ca-containing low-alloy weathering steel comprises the following steps:

[0036] 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;

[0037] 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 roll...

Embodiment 2

[0039] A low-alloy weathering steel containing Ca, its chemical composition and mass percentage content are: C: 0.027%; Si: 0.23%; Mn: 0.63%; Cu: 0.31%; Ni: 0.21%; Nb: 0.07%; Ti: 0.010%; P: 0.015%; S: 0.002%; Ca: 0.0008%; the rest is Fe and unavoidable impurities.

[0040] The preparation method of the Ca-containing low-alloy weathering steel comprises the following steps:

[0041] 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;

[0042] 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℃. ...

Embodiment 3

[0044] A low-alloy weathering steel containing Ca, its chemical composition and mass percentage content are: C: 0.03%; Si: 0.22%; Mn: 0.75%; Cu: 0.35%; Ni: 0.42%; Nb: 0.06%; Ti: 0.01%; P: 0.02%; S: 0.002%; Ca: 0.0013%; the rest is Fe and unavoidable impurities.

[0045] The preparation method of the Ca-containing low-alloy weathering steel comprises the following steps:

[0046] 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;

[0047] 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...

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Abstract

The invention provides Ca-containing low-alloy weathering-resistant steel. Chemical ingredients of the Ca-containing low-alloy weathering-resistant steel include, by mass, 0.02%-0.05% of C, 0.20%-0.30% of Si, 0.6%-1.00% of Mn, 0.005%-0.010% of Ti, 0.0005%-0.0020% of Ca, 0.20%-0.40% of Cu, 0.20%-0.60% of Ni, 0.04%-0.07% of Nb, not larger than 0.02% of P, not larger than 0.08% of S, not larger than 0.02% of Al and the balance Fe and inevitable impurities. The size and distribution of inclusions in the steel can be changed by adding the appropriate amount of Ca, the tiny inclusions in the steel are easily generated and are evenly dispersed and distributed, the structure of the steel can be more uniform, the strength of the steel is improved, the weathering resistance of the steel can be effectively improved by using the Ca and other elements such as Si and Cu in cooperation, the weathering resistance of the steel under the natural condition is improved, and the corrosion-resistant performance of the steel is improved.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to a Ca-containing low-alloy weathering steel and a preparation method and application thereof. 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 bridge steel, the per...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/14C22C38/16C22C38/08C22C38/12C22C38/06C22C38/60C21D8/02E01D19/00
CPCC21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/60E01D19/00
Inventor 付贵勤李东亮朱苗勇贾雄飞
Owner NORTHEASTERN UNIV
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