High-strength weather-resistant steels and production method thereof

A production method and weather-resistant steel technology, which is applied in the field of iron and steel smelting, can solve the problem that steel cannot achieve high strength and high weather resistance at the same time

Active Publication Date: 2020-05-05
湖南华菱涟源钢铁有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiment of the present application is to provide a high-strength weather-resistant steel to solve the technical problem that the steel in the prior art cannot achieve high strength and high weather resistance at the same time

Method used

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  • High-strength weather-resistant steels and production method thereof
  • High-strength weather-resistant steels and production method thereof
  • High-strength weather-resistant steels and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] As a specific embodiment of the present invention, the high-strength weathering steel contains the following chemical composition by weight percentage: C: 0.06%, Si: 0.23%, Mn: 1.48%, P: 0.0055%, S: 0.0045%, Ni: 0.19%, Cr: 0.47%, Cu: 0.32%, Als: 0.010%, N: 0.0034%, Ti: 0.11%, Nb: 0.03%, and the balance is Fe and unavoidable impurity elements. The details are shown in Table 1 below:

[0026] Table 1 Unit: wt%

[0027]

[0028] It is smelted in a vacuum induction furnace, and then the smelted molten steel is poured into a water-cooled copper mold for cooling and setting to obtain an ingot. Cut off the riser of the ingot and heat it to 1200 degrees Celsius for 2 hours of heat preservation. After the heat preservation is completed, the ingot is forged into a billet of 80mm×80mm.

[0029] Rolling: Reheat the billet to 1200°C and keep it warm for 2-3 hours to fully austenitize, then carry out two-stage controlled rolling and controlled cooling, the first-stage rolling te...

Embodiment 2

[0036] As a specific embodiment of the present invention, the high-strength weathering steel contains the following chemical composition by weight percentage: C: 0.06%, Si: 0.24%, Mn: 1.50%, P: 0.0065%, S: 0.0045%, Cr: 0.48%, Cu: 0.33%, Als: 0.012%, N: 0.0042%, Ti: 0.13%, Nb: 0.034%, and the balance is Fe and unavoidable impurity elements. Specifically as shown in Table 3 below,

[0037] Table 3 Unit: wt%

[0038]

[0039] It is smelted in a vacuum induction furnace, and then the smelted molten steel is poured into a water-cooled copper mold for cooling and setting to obtain an ingot. Cut off the riser of the ingot and heat it to 1200 degrees Celsius for 2 hours of heat preservation. After the heat preservation is completed, the ingot is forged into a billet of 80mm×80mm.

[0040] Rolling: Reheat the billet to 1200°C and keep it warm for 2-3 hours to fully austenitize, then carry out two-stage controlled rolling and controlled cooling, the first-stage rolling temperature ...

Embodiment 3

[0047] As a specific embodiment of the present invention, the high-strength weathering steel contains the following chemical composition by weight percentage: C: 0.07%, Si: 0.26%, Mn: 1.45%, P: 0.0058%, S: 0.0062%, Cu: 0.33%, Als: 0.013%, N: 0.0035%, Ti: 0.12%, Nb: 0.036%, and the balance is Fe and unavoidable impurity elements. Specifically, as shown in Table 5 below,

[0048] Table 5 Unit: wt%

[0049]

[0050] It is smelted in a vacuum induction furnace, and then the smelted molten steel is poured into a water-cooled copper mold for cooling and setting to obtain an ingot. Cut off the riser of the ingot and heat it to 1200 degrees Celsius for 2 hours of heat preservation. After the heat preservation is completed, the ingot is forged into a billet of 80mm×80mm.

[0051] Rolling: Reheat the billet to 1200°C and keep it warm for 2-3 hours to fully austenitize, then carry out two-stage controlled rolling and controlled cooling, the first-stage rolling temperature is 1120-11...

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Abstract

The invention provides high-strength weather-resistant steels. The high-strength weather-resistant steels comprise the following chemical compositions of, in percentage by weight, 0.06%-0.07% of C, 0.23%-0.26% of Si, 1.40%-1.50% of Mn, less than or equal to 0.009% of P, less than or equal to 0.007% of S, less than or equal to 0.015% of Als, 0.0%-0.19% of Ni, 0.0%-0.51% of Cr, 0.31%-0.33% of Cu, 0.110%-0.12% of Ti, 0.030%-0.036% of Nb, 0.0%-0.09% of Sb, less than or equal to 0.055% of N, and the balance Fe and inevitable impurities. According to the high-strength weather-resistant steels, the balance of high strength, high plasticity and high toughness is achieved, meanwhile, near-all-ferrite matrix tissue is obtained, extra volume of the grain boundary is greatly reduced, relatively high coiling temperature is adopted, dislocation density is greatly reduced, and high weather resistance is achieved.

Description

technical field [0001] The application belongs to the technical field of iron and steel smelting, and in particular relates to a high-strength weathering steel and a production method thereof. Background technique [0002] The metal equipment and materials scrapped due to corrosion every year in the world are equivalent to 20-40% of the annual metal output. The direct economic loss caused by steel corrosion in my country exceeds 10 billion yuan each year, and the corrosion of steel reduces the service life of steel structures, causing Casualties, economic losses, and environmental pollution caused by emissions. On the other hand, railway vehicles are corroded by the atmospheric environment in service and face serious atmospheric corrosion problems. In order to meet the high-speed and heavy-duty requirements of my country's railways, the strength standards of weathering steel for railway vehicles have been continuously improved. However, high corrosion resistance and high str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/60C21D8/02
CPCC21D8/0226C21D2211/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/60
Inventor 董常福陈俊刘旭辉李光辉刘振宇郑庆梁亮胡大
Owner 湖南华菱涟源钢铁有限公司
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