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420MPa-grade weather-resistant bridge steel and production method thereof

A production method and bridge steel technology, applied in the field of weather-resistant steel production, can solve the problems of high alloy cost, high equipment capacity requirements, and the inability to stably produce 420MPa-level weather-resistant bridge steel in industrialized batches, so as to increase supply and reduce costs Effect

Inactive Publication Date: 2021-08-03
TANGSHAN IRON & STEEL GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technical ideas either have high alloy costs, or although the alloy costs are not high, they require high equipment capabilities, so they are not suitable for industrial production in small and medium-sized steel mills with average domestic equipment capabilities.
Therefore, it is urgent to develop a 420MPa-grade weather-resistant bridge steel with low cost, easy industrial production, and good comprehensive performance and its production method, so as to solve the problem that domestic small and medium-sized steel mills cannot stably produce 420MPa-grade weather-resistant bridges in batches due to equipment capacity constraints. Steel Matters, Meeting the Growing Demand for Weathering Steel Bridge Construction

Method used

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  • 420MPa-grade weather-resistant bridge steel and production method thereof
  • 420MPa-grade weather-resistant bridge steel and production method thereof
  • 420MPa-grade weather-resistant bridge steel and production method thereof

Examples

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Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with specific embodiments and accompanying drawings.

[0051] The chemical compositions and mass percentages of the weather-resistant bridge steels of Examples 1-10 of the present invention and Comparative Examples 1-5 are shown in Table 1, and the balance is Fe and unavoidable impurities.

[0052] The production method of the 420MPa grade weather-resistant bridge steel of the present invention is specifically as follows.

[0053] (1) Steel billet preparation. Raw materials are prepared according to the design requirements of the weathering steel composition in Table 1, and the billet is obtained through the process of smelting molten iron-LF refining-RH refining-continuous casting. Among them, the LF refining process adopts white slag operation, the white slag retention time is ≥ 10min, and the total refining time is guaranteed to be ≥ 30min. The chemical composition of molten steel is contr...

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Abstract

The invention discloses 420MPa-grade weather-resistant bridge steel and a preparation method thereof. The 420MPa-grade weather-resistant bridge steel is prepared from the chemical components including, by mass, 0.05%-0.07% of C, 0.25%-0.50% of Si, 1.10%-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.28%-0.35% of Cu, 0.20%-0.30% of Ni, 0.45%-0.55% of Cr, less than or equal to 0.10% of Mo, 0.008%-0.030% of Nb, 0.010%-0.030% of Ti, 0.005%-0.015% of V, 0.020%-0.035% of Als, 0.0020%-0.0050% of Ca, less than or equal to 0.0040% of O, 0.0025%-0.0080% of N, and the balance Fe and inevitable impurities; and Nb / C+V / N is larger than or equal to 1.8 and is less than or equal to 3.5. The low-C-proper-Si and Mn-trace Nb-V-N alloying thought is adopted, the low-cost thought of high Cr and low Cu and Ni is adopted, a proper amount of Cu-Cr-Ni is added, the weather resistance is guaranteed, and the 420MPa-grade weather-resistant bridge steel which is low in cost, excellent in comprehensive performance, wide in production process window and capable of easily achieving batch industrial production is obtained, the composition system is matched with the optimized TMCP+tempering preparation technology, the requirement for the capacity of production equipment is reduced, and the steel is suitable for batch industrial production of small and medium-sized steel mills.

Description

technical field [0001] The invention relates to a 420MPa grade weather-resistant bridge steel and a production method thereof, belonging to the technical field of weather-resistant steel production. Background technique [0002] In recent years, bridge construction has developed rapidly. With the completion of the coating-free weather-resistant railway bridge spanning the Yarlung Zangbo River Zangmu Super Bridge and the coating-free weather-resistant highway bridge Guanting Reservoir Super Bridge, weathering steel has excellent mechanical properties, weldability and The weather resistance performance is more and more recognized by people, and the demand for weather resistance bridge steel in the construction of steel structure bridges is also increasing. At present, in order to achieve excellent performance indicators of mechanics, welding and weather resistance, the addition of Cu, Ni, V and other precious alloy elements in 420MPa weather-resistant bridge steel is relativel...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/06C22C38/58C22C38/50C21D8/02
CPCC22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/06C22C38/58C22C38/50C21D8/0226C21D8/0263C21D2211/005C21D2211/002C21D2211/008C21D2211/001C21D2211/009
Inventor 刘宝喜杜秀珍尹绍江郑文超安海玉张锦兴郝鑫吴建国于玮弘
Owner TANGSHAN IRON & STEEL GROUP
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