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Marine-climate-resistant easy-to-weld weather-resistant steel plate for bridge and production method of steel plate

A marine climate and production method technology, applied in the field of metallurgy, can solve the problems of low Ni content, unsatisfactory marine climate corrosion resistance, etc., achieve uniform overall performance and structure, ensure easy weldability, and reduce production costs.

Inactive Publication Date: 2020-12-25
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent is different in the rolling process of the strip and the medium and heavy plate. In addition, the Ni content of the patent is small, and it is a steel resistant to ordinary atmospheric corrosion. The corrosion performance testing method refers to ASTMG101, and the effect of marine weather corrosion resistance is not ideal.

Method used

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  • Marine-climate-resistant easy-to-weld weather-resistant steel plate for bridge and production method of steel plate
  • Marine-climate-resistant easy-to-weld weather-resistant steel plate for bridge and production method of steel plate
  • Marine-climate-resistant easy-to-weld weather-resistant steel plate for bridge and production method of steel plate

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In this embodiment, the thickness of the weather-resistant steel plate for the Q345qDNHY-I bridge, which is resistant to marine climate and easy to weld, is 20 mm. The chemical composition and mass percentage are shown in Table 1. The weather-resistant index V value of the weather-resistant steel plate is 1.22.

[0033] The production method of the marine weather-resistant and easy-to-weld Q345qDNHY-I bridge weather-resistant steel plate in this embodiment includes primary refining, LF refining, Ca treatment, rolling, and controlled cooling. The specific process steps are as follows:

[0034] (1) Initial smelting process, tapping molten steel C: 0.04%;

[0035] (2) In the LF refining process, 1.5kg / t steel Al wire is added for deep deoxidation after the initial refining and tapping, and then 0.8kg / t steel Al particles are added for slag deoxidation, and the white slag retention time is 35min;

[0036](3) Ca treatment process, adding 0.14kg / t steel solid pure calcium cor...

Embodiment 2

[0042] In this embodiment, the thickness of the weather-resistant steel plate for the Q345qDNHY-I bridge, which is resistant to marine climate and easy to weld, is 30 mm. The chemical composition and mass percentage are shown in Table 1. The weather-resistant index V value of the weather-resistant steel plate is 1.22.

[0043] The production method of the marine weather-resistant and easy-to-weld Q345qDNHY-I bridge weather-resistant steel plate in this embodiment includes primary refining, LF refining, Ca treatment, rolling, and controlled cooling. The specific process steps are as follows:

[0044] (1) Initial smelting process, tapping molten steel C: 0.05%;

[0045] (2) In the LF refining process, 1.9kg / t of steel Al wire is added for deep deoxidation after the initial smelting and tapping, and then 0.7kg / t of steel Al particles are added for slag deoxidation, and the white slag is kept for 30 minutes;

[0046] (3) Ca treatment process, add 0.10kg / t steel solid pure calcium ...

Embodiment 3

[0052] In this example, the thickness of the weather-resistant steel plate for the marine climate-resistant and easy-to-weld Q345qDNHY-I bridge is 50 mm, and its chemical composition and mass percentage are shown in Table 1. The weather resistance index V value of the weather-resistant steel plate is 1.23.

[0053] The production method of the marine weather-resistant and easy-to-weld Q345qDNHY-I bridge weather-resistant steel plate in this embodiment includes primary refining, LF refining, Ca treatment, rolling, and controlled cooling. The specific process steps are as follows:

[0054] (1) Initial smelting process, tapping molten steel C: 0.03%;

[0055] (2) In the LF refining process, 1.7kg / t steel Al wire is added for deep deoxidation after the initial refining and tapping, and then 0.9kg / t steel Al particles are added for slag deoxidation, and the white slag retention time is 40min;

[0056] (3) Ca treatment process, adding 0.07kg / t steel solid pure calcium cored wire for...

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Abstract

The invention discloses a marine-climate-resistant easy-to-weld weather-resistant steel plate for a bridge and a production method of the steel plate. The weather-resistant steel plate comprises, by mass, 0.06-0.10% of C, 1.30-1.50% of Mn, <=0.010% of P, <=0.002% of S, 0.015-0.035% of Nb, 1.25-1.50% of Ni, 0.015-0.040% of Al, 0.30-0.40% of Cu, 0.06-0.10% of Mo and the balance of Fe and inevitableimpurities. The production method comprises the procedures of primary smelting, LF refining, Ca treatment, rolling and controlled cooling. Through innovative component design and by controlling rolling and controlled cooling modes, the overall performance and structure of the produced steel plate are uniform and consistent, it is guaranteed that the strength and -20 DEG C low-temperature impact meet the requirements, the production cost is reduced, and the product performance reaches the international advanced level and is highly trusted by customers.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a weather-resistant steel plate for a marine climate-resistant and easy-weld bridge and a production method thereof. Background technique [0002] With the rapid development of bridge steel, the amount of weather-resistant bridge steel used in inland and ocean areas is gradually increasing, and the quality requirements of products are becoming more and more stringent, especially for steel plates that are required to be weather-resistant, environmentally friendly, and easy to weld. and other special requirements. [0003] In general, in order to ensure the seawater corrosion resistance of bridge steel, the traditional method is to apply corrosion-resistant coatings on the surface of ordinary bridge steel plates, which requires a large amount of construction and also causes certain pollution to the environment. After long-term service in the marine environment, the ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/12C22C38/08C22C38/06C22C38/16C22C33/04C21D8/02
CPCC21D8/0205C21D8/0226C21D2211/005C22C33/04C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16
Inventor 谷盟森李建朝李杰龙杰于红伟吴天育高雅张志军徐腾飞王晓书靳兴亚程海林王少义
Owner WUYANG IRON & STEEL