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Steel wire rod for bridge cables and manufacturing method thereof

A manufacturing method and steel wire rod technology, which is applied in the field of manufacturing steel wire rods for bridge cables and steel wire rods for bridge cables, can solve problems such as high cost and long process flow, achieve good carbon segregation, and improve central equiaxial Crystal, the effect of ensuring castability

Active Publication Date: 2022-03-01
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of long technological process and high cost in the production of steel wire rods for bridge cables, the present invention provides a steel wire rod for bridge cables and a bridge that can be fired from billet and free of subsequent off-line heat treatment Manufacturing method of steel wire rod for cables

Method used

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  • Steel wire rod for bridge cables and manufacturing method thereof
  • Steel wire rod for bridge cables and manufacturing method thereof
  • Steel wire rod for bridge cables and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The composition of steel wire rod for bridge cable of embodiment 1 is C: 0.85%, Si: 0.35%, Mn: 0.70%, Cr: 0.10%, P: 0.010%, S: 0.010%, Ni: 0.10%, Cu: 0.05%, Al: 0.04%, V: 0.05%, O: 0.002%, N: 0.004%, and the balance is iron and unavoidable impurities.

[0024] In this embodiment, the mechanical properties of the steel wire rod for cables without heat treatment are ensured, the heat treatment process is reduced, and the production cost is saved by properly proportioning Cr, V, Al, and Si elements in the composition. Among them, the element Cr0.10% can ensure the strength of the steel wire through the test, and can inhibit decarburization to a certain extent. Because if it is too high or too low, the plasticity index of the wire rod will be reduced, and the control of the sorbite structure is difficult. The choice of element V0.05% is confirmed in the course of the test, and the presence of this proportion of V in the form of carbonitride in the steel can effectively imp...

Embodiment 2

[0033] As in the preparation steps of Example 1, the chemical composition of the steel wire rod for bridge cables in Example 2 is C: 0.88%, Si: 0.25%, Mn: 0.80%, Cr: 0.20%, P: 0.005% in weight percentage , S: 0.005%, Ni: 0.20%, Cu: 0.02%, Al: 0.030%, V: 0.03%, O: 0.001%, N: 0.002%, and the balance is iron and unavoidable impurities.

[0034] Tundish superheat control after VD vacuum treatment: 20°C; mold electromagnetic stirring current 400A, frequency 3.5HZ; terminal electromagnetic stirring current 500A, frequency 10HZ; continuous casting billet size 150mm×150mm.

[0035] During the rolling process, the billet heating parameters are as follows: heating stage 1 830°C, heating stage 2 1050°C, soaking stage 1120°C; total heating time 120min; hot rolling parameters: starting rolling temperature 1030°C, entering finishing mill 900°C, The reduced warp is 900°C, the silk spinning is 900°C; the speed of the roller table is 1.2m / s, and the speed of the finished product is 30m / s; the ...

Embodiment 3

[0038] As in the preparation steps of Example 1, the chemical composition of the steel wire rod for bridge cables in Example 3 is C: 90%, Si: 0.50%, Mn: 0.90%, Cr: 0.10%, P: 0.010% in weight percentage , S: 0.007%, Ni: 0.15%, Cu: 0.05%, Al: 0.03%, V: 0.05%, O: 0.002%, N: 0.004%, and the balance is iron and unavoidable impurities.

[0039] After VD vacuum treatment, the superheat of the tundish is controlled at 25°C; the electromagnetic stirring current of the mold is 400A, the frequency is 3.5HZ; the terminal electromagnetic stirring current is 500A, and the frequency is 10HZ; the specification of the continuous casting billet is 150mm×150mm.

[0040] During the rolling process, the heating parameters of the billet are: heating stage 1 860°C, heating stage 2 1125°C, soaking stage 1160°C; total heating time 150min; The reduced warp is 930°C, the silk spinning is 930°C; the speed of the roller table is 1.2m / s, and the speed of the finished product is 20m / s; the air cooling param...

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Abstract

The invention discloses a steel wire rod for bridge cables and a manufacturing method thereof, comprising the following production steps: smelting, continuous casting and rolling; the chemical composition of the steel wire rod for bridge cables of the invention is C: 0.85~0.85~ 0.91%, Si: 0.20~0.50%, Mn: 0.60~0.90%, Cr≤0.20%, P≤0.015%, S≤0.015%, Ni≤0.20%, Cu≤0.10%, Al≤0.05%, V≤0.1 %, O≤0.003%, N≤0.006%, and the balance is Fe and unavoidable impurities; the invention adopts a scientific and reasonable matching ratio of Cr, V, Al and Si in the composition of steel wire rods for bridge cables, and adopts The reasonable manufacturing method reduces the process, saves the cost, and ensures the mechanical performance requirements of the wire rod, thereby ensuring the subsequent manufacturing and use performance of the galvanized steel wire.

Description

technical field [0001] The invention relates to the field of metal materials and their manufacture, in particular to a steel wire rod for bridge cables and a manufacturing method for the steel wire rod for bridge cables. Background technique [0002] In recent years, the construction of large-scale bridges has developed vigorously. Key technologies such as long-span bridge design, civil engineering construction technology, steel box girder and steel wire for bridge cables have become increasingly mature. Suspension bridges and cable-stayed bridges have exceeded kilometer-level spans; The development of steel wire for bridge cables is more prominent. [0003] Hot-dip galvanized steel wire for bridge cables generally refers to high-carbon hot-rolled sorbite wire rod as raw material, which is made of surface treatment, cold drawing, hot-dip galvanizing, stabilization treatment and other processes for preparing bridge cables. strands of steel wire. The demand for improving bri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/16C22C38/06C22C38/12C22C38/20C22C38/24C22C38/40C22C38/42C22C38/46C21D8/06C21C7/10B22D11/115
CPCC22C38/02C22C38/04C22C38/08C22C38/16C22C38/06C22C38/12C22C38/20C22C38/24C22C38/40C22C38/42C22C38/46C21D8/065C21C7/10B22D11/115
Inventor 王淼饶子才屈小波王鲁义王薛鹏蒋鹏石磊马伟纪文杰
Owner JIANGSU YONGGANG GROUP CO LTD
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