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A kind of manufacturing method of high-strength bridge cable steel

A manufacturing method and high-strength technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of torsion value fluctuations, unfavorable steel wire quality, bridge safety, and difficult production, etc., to reduce density, increase ultra-high strength, reduce Effect of Steel Weight

Inactive Publication Date: 2020-10-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high content of C and N ensures the strength of the steel wire, but the production is difficult and if the production control is not proper, it is often accompanied by large fluctuations in the torsion value, which is not conducive to the control of the quality of the steel wire and the safety of the bridge

Method used

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  • A kind of manufacturing method of high-strength bridge cable steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-strength bridge cable steel having the following chemical composition shown in weight percent:

[0029] C: 0.15%,

[0030] Mn: 1.60%,

[0031] Al: 4.0%,

[0032] P: 0.001%,

[0033] S: 0.001%,

[0034] Co: 0.35%,

[0035] Ti: 0.05%;

[0036] The rest is Fe and unavoidable impurities.

[0037] Described bridge cable steel is steel wire, and its manufacturing method comprises the following steps:

[0038] S1, prepare wire rod, the diameter of wire rod is 14mm, and the chemical composition composition of described wire rod is identical with described carbon-free compound bainite bridge cable steel; In this scheme, the preparation technology of wire rod adopts existing wire rod production technology;

[0039] S2. Heating the wire rod obtained in the step S1 to 700° C. at a heating rate of 16° C. / s in an air-isolated condition and keeping it warm for 30 minutes, and then drawing it for the first time. The wire rod after the first drawing The diameter of the w...

Embodiment 2

[0041] A high-strength bridge cable steel having the following chemical composition shown in weight percent:

[0042] C: 0.17%,

[0043] Mn: 1.63%,

[0044] Al: 4.4%,

[0045] P: 0.007%,

[0046] S: 0.007%,

[0047] Co: 0.37%,

[0048] Ti: 0.054%;

[0049] The rest is Fe and unavoidable impurities.

[0050] Described bridge cable steel is steel wire, and its manufacturing method comprises the following steps:

[0051]S1, prepare wire rod, the diameter of wire rod is 14mm, and the chemical composition composition of described wire rod is identical with described carbon-free compound bainite bridge cable steel; In this scheme, the preparation technology of wire rod adopts existing wire rod production technology;

[0052] S2. Heating the wire rod obtained in the step S1 to 720° C. at a heating rate of 17° C. / s in an air-isolated condition and keeping it warm for 32 minutes, and then drawing it for the first time. The wire rod after the first drawing The diameter of the w...

Embodiment 3

[0054] A high-strength bridge cable steel having the following chemical composition shown in weight percent:

[0055] C: 0.18%,

[0056] Mn: 1.67%,

[0057] Al: 5.0%,

[0058] P: 0.006%,

[0059] S: 0.006%,

[0060] Co: 0.40%,

[0061] Ti: 0.06%;

[0062] The rest is Fe and unavoidable impurities.

[0063] Described bridge cable steel is steel wire, and its manufacturing method comprises the following steps:

[0064] S1, prepare wire rod, the diameter of wire rod is 14mm, and the chemical composition composition of described wire rod is identical with described carbon-free compound bainite bridge cable steel; In this scheme, the preparation technology of wire rod adopts existing wire rod production technology;

[0065] S2. Heat the wire rod obtained in the step S1 to 750° C. at a heating rate of 18° C. / s in the air-isolated condition and keep it warm for 35 minutes before drawing it for the first time. The wire rod after the first drawing The diameter of the wire rod ...

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Abstract

The invention discloses high-strength bridge cable steel and a manufacturing method thereof. The bridge cable steel comprises the following chemical components of, in parts by weight, 0.15%-0.21% of C, 1.60%-1.75% of Mn, 4.0%-6.0% of Al, Less than 0.01% of P, less than 0.01% of S, 0.35%-0.45% of Co, 0.05%-0.07% of Ti, and balance Fe and inevitable impurities. The high-strength bridge cable steel and the manufacturing method thereof provided by the invention, the requirements of large-span and lightweight construction of bridges are met.

Description

technical field [0001] The invention relates to the field of wire materials for bridge cables. More specifically, the present invention relates to a method of manufacturing high-strength bridge cable steel. Background technique [0002] Bridge cable steel wire is a safe load-bearing part of modern bridges (cable-stayed bridges, suspension bridges), which are made of high-carbon steel wire rods that are cold-drawn and hot-dip galvanized. Since the 1990s, the strength of bridge cable steel wire has been continuously improved, gradually developing from 1670MPa, 1770MPa to 1860MPa, 1960MPa. High strength means a larger bridge span (to meet the needs of crossing rivers and seas, and reduce the impact on ecology and navigation. ), higher safety (reduced bridge self-weight) and lower investment cost (reduced steel consumption), are key indicators to measure the level of bridge construction. [0003] Data show that as the "lifeline" of modern bridges, the strength of the cable ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/10C22C38/14C21D6/00C21D8/06C21D9/52
CPCC21D6/005C21D6/007C21D8/065C21D9/525C22C38/002C22C38/04C22C38/06C22C38/10C22C38/14
Inventor 张帆鲍思前毛新平赵刚贺萌瞿熙
Owner WUHAN UNIV OF SCI & TECH