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500MPa-grade niobium-titanium microalloyed weather-resistant Z-shaped steel and production method thereof

A B-shaped steel and micro-alloying technology, which is applied in metal rolling and other directions, can solve the problems of large consumption of precious alloy resources, single production component system, and high content of alloy elements, so as to improve the comprehensive service performance of materials, improve the utilization rate, The effect of improving economic efficiency

Active Publication Date: 2022-04-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention overcomes the problems of high alloy element content, low alloy utilization rate and large consumption of precious alloy resources caused by the single production component system of the current hot-rolled B-shaped steel, which mainly relies on vanadium microalloying means, and solves the problems of the prior art at the same time. The problem that it is impossible to realize the good application of Ti-based microalloying technology in 500MPa high-strength weather-resistant B-shaped steel

Method used

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  • 500MPa-grade niobium-titanium microalloyed weather-resistant Z-shaped steel and production method thereof
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Examples

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Effect test

Embodiment 1

[0062] This example is used to illustrate the 500MPa niobium-titanium microalloyed weather-resistant B-shaped steel and its production method described in the present invention.

[0063] Melt desulfurized hot metal and scrap steel into molten steel; when the temperature of molten steel reaches 1720°C and the composition of molten steel reaches C: 0.03%, P: 0.003%, and S: 0.025% by mass fraction, the steel is tapped; Add silico-manganese and calcium oxide; ladles are transported to the refining station for refining; during the refining process, electricity is sent to raise the temperature, white slag is desulfurized, deoxidized and alloyed; in the process of adjusting the composition, the mass fraction of V and Nb is first adjusted to V: 0.15 %, Nb: 0.01%, and then adjust the content of Ti to 0.01%, satisfying the relationship (1): [V]+0.76[Nb]+1.86[Ti]-5.88[Ti] 2 =0.176; finally, get the molten steel with qualified composition; send the molten steel with qualified composition ...

Embodiment 2

[0067] This example is used to illustrate the 500MPa niobium-titanium microalloyed weather-resistant B-shaped steel and its production method described in the present invention.

[0068]Melt desulfurized hot metal and scrap steel into molten steel; when the temperature of molten steel reaches 1650°C and the composition of molten steel reaches C: 0.08%, P: 0.02%, S: 0.001%, Mo: 0.0001%, and B: 0.001%, the Steel; during the tapping process, aluminum and pre-melted slag are added to the ladle; the ladle is transported to the refining station for refining; during the refining process, power is sent to raise the temperature, white slag is desulfurized, and deoxidized alloying; in the process of adjusting the composition, first Adjust the V and Nb mass fractions to V: 0.07%, Nb: 0.02%, and then adjust the Ti content to 0.08%, satisfying the relationship (1): [V]+0.76[Nb]+1.86[Ti]-5.88[Ti ] 2 =0.196; the molten steel is subjected to VD refining; when the oxygen mass fraction in the ...

Embodiment 3

[0073] This example is used to illustrate the 500MPa niobium-titanium microalloyed weather-resistant B-shaped steel and its production method described in the present invention.

[0074] Melt desulfurized hot metal and scrap steel into molten steel; when the temperature of molten steel reaches 1690°C and the composition of molten steel reaches C: 0.06%, P: 0.005%, and S: 0.02% by mass fraction, the steel is tapped; Calcium and calcium oxide are added to the mixture; the ladle is transported to the refining station for refining; during the refining process, argon is blown at the bottom of the ladle, power is sent to raise the temperature, white slag is desulfurized, and deoxidized and alloyed; in the process of adjusting the composition, first adjust the quality of V and Nb The score reaches V: 0.01%, Nb: 0.01%, and then adjusts the content of Ti to 0.15%, satisfying the relationship (1): [V]+0.76[Nb]+1.86[Ti]-5.88[Ti] 2 = 0.164; when the oxygen mass fraction in the molten stee...

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Abstract

The invention relates to the technical field of steel production, in particular to 500 MPa-grade niobium-titanium microalloyed weather-resistant Z-shaped steel and a production method thereof. Based on the total mass of the 500 MPa-grade niobium-titanium microalloyed weather-resistant Z-shaped steel, the 500 MPa-grade niobium-titanium microalloyed weather-resistant Z-shaped steel comprises the following chemical components in percentage by mass: 0.06%-0.15% of C, 0.15%-0.75% of Si, 1.0%-1.7% of Mn, 0.01%-0.15% of V, 0.01%-0.15% of Ti and 0.01%-0.05% of Nb, and the content of V, the content of Nb and the content of Ti meet the condition that [V] + 0.76 [Nb] + 1.86 [Ti]-5.88 [Ti] < 0.24. By limiting the reasonable matching relation of the alloy elements, the strengthening effect of the alloy elements is effectively improved, the alloy cost is remarkably reduced, and the comprehensive performance of the material is stably improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a 500MPa grade niobium-titanium microalloyed weather-resistant B-shaped steel and a production method thereof. Background technique [0002] The middle beam of a freight car is the main key component of a railway freight car. It is the most stressed and most important part of the vehicle. It is known as the backbone of the vehicle. Its strength directly affects the structural performance of the carriage. With the requirement of increasing the speed and reducing the weight of the railway, the requirements for the center girder are getting higher and higher. The B-shaped steel is a special special steel used to make the middle beam of the train carriage. With the development of high-speed and heavy-duty railways in my country, there are higher requirements for the performance of B-shaped steel. While meeting the strength and low-temperature impact toughness, it a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58B21B1/098B21B1/46C21C7/00C21C7/06C22C33/04
CPCY02P10/20
Inventor 郭跃华王超刘明赵小天邓通武李红光
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP