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A kind of 500mpa grade strong and tough weathering bridge steel and preparation method thereof

A bridge steel, strong and tough technology, applied in the field of metallurgy, can solve the problems of less weather resistance research, achieve high stability, good long life, and meet the effect of long life

Active Publication Date: 2021-07-27
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from this that there are few studies on the weather resistance of high-performance bridge steel in the prior art, and it is urgent to vigorously develop coating-free weather-resistant steel to realize efficient and green manufacturing of steel bridges

Method used

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  • A kind of 500mpa grade strong and tough weathering bridge steel and preparation method thereof
  • A kind of 500mpa grade strong and tough weathering bridge steel and preparation method thereof
  • A kind of 500mpa grade strong and tough weathering bridge steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1. Firstly, the molten iron is smelted. After the molten iron is pretreated by dephosphorization and desulfurization, it is kept at 1600° C. for 25 minutes in an electric arc furnace for smelting to obtain molten iron.

[0047] Then proceed as follows:

[0048] A. Refining: transfer the molten iron to the ladle furnace, press the pressure of 0.3 MPa and the flow rate of 140NL / min, blow Ar gas and stir, and refine for 45 minutes;

[0049] Adjust the mass percentage of chemical composition as follows: C 0.050, Si 0.33, Mn 1.27, Cr 0.45, Ni0.37, Cu 0.33, Mo 0.21, P 0.0085, S 0.0024, Nb 0.028, V 0.022, Ti 0.016, Al 0.026, The balance is Fe and unavoidable impurities, stirring for 20-30 minutes;

[0050] B. Vacuum treatment: transfer to the ladle refining furnace, control the vacuum degree to 0.8 mbar, keep the vacuum for 25 minutes, stir for 16 minutes after breaking the vacuum, adjust the chemical composition, feed Al wire, and continuously cast electromagnetic...

Embodiment 2

[0057] Embodiment 2: Firstly, the molten iron is smelted. After the molten iron is pretreated by dephosphorization and desulfurization, the molten iron is smelted under the control of 1600° C. for 25 minutes in an electric arc furnace to obtain molten iron.

[0058] Then proceed as follows:

[0059]A. Refining: transfer the molten iron to the ladle furnace, press the pressure of 0.4 MPa and the flow rate of 130NL / min, blow Ar gas and stir, and refine for 40 minutes;

[0060] Adjust the mass percentage of chemical composition by the numerical value of table 1, and surplus is Fe and unavoidable impurity,

[0061] Stir for 20-30 minutes;

[0062] B. Vacuum treatment: transfer to the ladle refining furnace, control the vacuum degree to 0.9 mbar, keep the vacuum for 20 minutes, stir for 18 minutes after breaking the vacuum, adjust the chemical composition, feed Al wire, continuous casting electromagnetic stirring, control the stirring intensity At 0.8L / (min•t), the stirring time ...

Embodiment 3

[0069] Embodiment 3: Firstly, molten iron is smelted. After the molten iron is pretreated by dephosphorization and desulfurization, the molten iron is smelted at 1600° C. for 25 minutes under control of an electric arc furnace to obtain molten iron.

[0070] Then proceed as follows:

[0071] A. Refining: transfer the molten iron to the ladle furnace, press the pressure of 0.2 MPa and the flow rate of 150NL / min, blow Ar gas and stir, and refine for 50 minutes;

[0072] Adjust the mass percentage of chemical composition by the numerical value of table 1, and surplus is Fe and unavoidable impurity,

[0073] Stir for 20-30 minutes;

[0074] B. Vacuum treatment: transfer to the ladle refining furnace, control the vacuum degree to 0.7 mbar, keep the vacuum for 23 minutes, stir for 16 minutes after breaking the vacuum, adjust the chemical composition, feed Al wire, and continuously cast electromagnetic stirring to control the stirring intensity At 0.8L / (min•t), the stirring time is...

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Abstract

The invention relates to a 500MPa grade strong and tough weather-resistant bridge steel, which belongs to the field of metallurgy technology, and its chemical composition is: C 0.04-0.06, Si 0.25-0.35, Mn 1.20-1.30, Cr 0.4-0.5, Ni 0.30-0.40, Cu 0.27‑0.37, Mo 0.2‑0.7, P<0.015, S<0.006, Nb 0.020‑0.030, V 0.015‑0.025, Ti 0.007‑0.017, Al 0.015‑0.040, the balance being Fe and unavoidable impurities. Its preparation method includes the steps of smelting into molten iron, refining, vacuum treatment, protective continuous casting, and thermomechanical rolling. Through the design of components and processes, acicular ferrite + bainitic ferrite + M-A components are obtained. Composite structure to achieve a good match of high strength, toughness, weather resistance and weldability.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to steel for bridge structures and a preparation method thereof, in particular to a tough and weather-resistant bridge steel with a yield strength of 500 MPa and a preparation method thereof. Background technique [0002] The rapid development of bridge construction technology in my country has promoted the rapid replacement and development of bridge steel. At present, the main span of some newly-built cable-stayed bridges has reached the kilometer level, and ordinary strength bridge steel can no longer meet the force requirements, and the bridge steel used for traditional steel bridge construction needs anti-corrosion coating, which is not conducive to environmental protection, and the maintenance cost is high . The existing high-performance bridge steel has high strength (yield 370MPa and above), high toughness (impact energy not less than 120J), low yield ratio (generally not hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C22C38/46C22C38/50C22C38/06C22C33/04C21D8/02
CPCC21D8/0226C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 王天生张林峰张烈王岳峰王青峰
Owner YANSHAN UNIV
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