Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

500Mpa grade tough weather-resistant bridge steel and preparation method thereof

A bridge steel, strong and tough technology, applied in the field of metallurgy, can solve the problem of less weather resistance research, achieve the effects of high stability, reduced use, and reduced construction costs

Active Publication Date: 2020-04-24
YANSHAN UNIV
View PDF11 Cites 11 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 500Mpa grade tough weather-resistant bridge steel and preparation method thereof
  • 500Mpa grade tough weather-resistant bridge steel and preparation method thereof
  • 500Mpa grade tough weather-resistant bridge steel and preparation method thereof

Examples

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, continuous casting electromagnetic st...

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Yield strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

Abstract

Belonging to the technical field of metallurgy, the invention relates to a 500Mpa grade tough weather-resistant bridge steel., which comprises the following chemical components by mass percentage: 0.04-0.06 of C, 0.25-0.35 of Si, 1.20-1.30 of Mn, 0.4-0.5 of Cr, 0.30-0.40 of Ni, 0.27-0.37 of Cu, 0.2-0.7 of Mo, less than 0.015 of P, less than 0.006 of S, 0.020-0.030 of Nb, 0.015-0.025 of V, 0.007-0.017 of Ti, 0.015-0.040 of Al and the balance Fe and inevitable impurities. The preparation method includes: smelting into molten iron, refining, vacuum treatment, protective continuous casting and thermal mechanical rolling. A multi-phase composite structure of acicular ferrite, bainite ferrite and M-A components is obtained through component and process design, and good matching of high strength,high toughness, weather resistance and weldability is achieved.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com