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Weather resisting hot-rolled steel strip and production method thereof

A technology of atmospheric corrosion resistance and production method, applied in the field of metallurgy, can solve the problems such as the inability to form a stable rust layer on the vehicle and the short corrosion life of the vehicle body, and achieve the effect of improving the atmospheric corrosion resistance and high strength level.

Inactive Publication Date: 2018-05-08
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the one hand, the steel used for railway vehicles has been affected by wear and corrosion for a long time, and on the other hand, it has been affected by the corrosion of complex environments (alternating between dry and wet, temperature difference, and industrial areas) for a long time. The vehicle cannot form a stable rust layer locally. In order to solve the corrosion life of the car body Short of the problem, it is urgent to develop a new generation of high corrosion resistance steel for railway vehicles

Method used

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  • Weather resisting hot-rolled steel strip and production method thereof
  • Weather resisting hot-rolled steel strip and production method thereof
  • Weather resisting hot-rolled steel strip and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, the atmospheric corrosion-resistant hot-rolled steel strip has a thickness of 2.5 mm and a width of 1250 mm. Its chemical composition and weight percentage are: C: 0.05%, Si: 0.27%, Mn: 0.43%, P: 0.013%, S: 0.002%, Cu: 0.316%, Ni: 0.291%, Cr: 3.63%, Als: 0.031%, N: 0.0049%, and the balance is Fe and unavoidable impurity elements.

[0027] The production method of atmospheric corrosion-resistant hot-rolled steel strip in this embodiment includes converter smelting, LF refining, vacuum treatment, slab continuous casting, slab heating, controlled rolling, controlled laminar cooling, coiling, and smoothing processes. The specific process steps are as follows Said:

[0028] (1) After the molten steel is smelted, the slab is obtained by LF refining, vacuum treatment, and continuous casting protection casting;

[0029] (2) Controlled rolling process: rough rolling is 5-pass rolling, the exit temperature is 1099°C, the thickness of the intermediate billet is 3...

Embodiment 2

[0036] In this example, the atmospheric corrosion-resistant hot-rolled steel strip has a thickness of 3.0 mm and a width of 1250 mm. Its chemical composition and weight percentage are: C: 0.064%, Si: 0.26%, Mn: 0.42%, P: 0.012%, S: 0.004%, Cu: 0.36%, Ni: 0.28%, Cr: 3.67%, Als: 0.032%, N: 0.0042%, and the balance is Fe and unavoidable impurity elements.

[0037] The production method of atmospheric corrosion-resistant hot-rolled steel strip in this embodiment includes converter smelting, LF refining, vacuum treatment, slab continuous casting, slab heating, controlled rolling, controlled laminar cooling, coiling, and smoothing processes. The specific process steps are as follows Said:

[0038] (1) After the molten steel is smelted, the slab is obtained by LF refining, vacuum treatment, and continuous casting protection casting;

[0039] (2) Controlled rolling process: rough rolling is 5-pass rolling, the exit temperature is 1115°C, the thickness of the intermediate billet is 34...

Embodiment 3

[0046] In this example, the atmospheric corrosion-resistant hot-rolled steel strip has a thickness of 4.0 mm and a width of 1250 mm. Its chemical composition and weight percentage are: C: 0.061%, Si: 0.22%, Mn: 0.44%, P: 0.010%, S: 0.002%, Cu: 0.37%, Ni: 0.29%, Cr: 3.58%, Als: 0.033%, N: 0.0040%, and the balance is Fe and unavoidable impurity elements.

[0047] The production method of atmospheric corrosion-resistant hot-rolled steel strip in this embodiment includes converter smelting, LF refining, vacuum treatment, slab continuous casting, slab heating, controlled rolling, controlled laminar cooling, coiling, and smoothing processes. The specific process steps are as follows Said:

[0048] (1) After the molten steel is smelted, the slab is obtained by LF refining, vacuum treatment, and continuous casting protection casting;

[0049] (2) Controlled rolling process: rough rolling is 5-pass rolling, the exit temperature is 1118°C, the thickness of the intermediate billet is 34...

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Abstract

The invention discloses a weather resisting hot-rolled steel strip and a production method thereof. The hot-rolled steel strip comprises, by weight, 0.04%-0.07% of C, 0-0.40% of Si, 0.30%-0.50% of Mn,0-0.015% of P, 0-0.005% of S, 0.30%-0.45% of Cu, 0.25%-0.35% of Ni, 3.50%-4.50% of Cr, 0-0.05% of Als, 0-0.006% of N and the balance Fe and inevitable impurity elements. The production method of thehot-rolled steel strip includes the working procedures of converter smelting, LF refining, vacuum treatment, slab continuous casting, slab heating, controlled rolling, controlled laminar cooling, coiling and flattening. According to the weather resisting hot-rolled steel strip and the production method thereof, the compound reinforcement effect of microalloy elements including copper, nickel and chromium is adopted to be matched with the controlled rolling and temperature control technology, and accordingly high corrosion-resisting steel with the strength level being high and the atmosphere corrosion resistance being more than twice that of common steel can be produced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an atmospheric corrosion-resistant hot-rolled steel strip and a production method thereof. Background technique [0002] With the rapid development of my country's railway construction and the improvement of railway vehicle technology, railway freight cars have ushered in a new period of rapid development, and railway vehicles are gradually developing towards high speed, heavy load and long life. , put forward higher requirements for steel used in railway vehicles. [0003] On the one hand, the steel used for railway vehicles has been affected by wear and corrosion for a long time, and on the other hand, it has been affected by the corrosion of complex environments (alternating between dry and wet, temperature difference, and industrial areas) for a long time. The vehicle cannot form a stable rust layer locally. In order to solve the corrosion life of the car body ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/42C22C38/06C21D8/02
CPCC22C38/04C21D8/0205C21D8/0226C22C38/001C22C38/02C22C38/06C22C38/42
Inventor 张晓磊王宝华徐立山包阔罗波薛启河程玉君
Owner HEBEI IRON AND STEEL
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