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Galvanized steel wire for high-strength and high-torsion bridge cable and its preparation process

A galvanized steel wire and preparation process technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of wire rod structure uniformity, unstable torsional performance, etc., and achieve excellent tensile strength and torsional performance, Easy operation and uniform tissue effect

Active Publication Date: 2019-12-03
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, the microstructure uniformity of Stelmo air-cooled wire rod after off-line heat treatment is significantly improved, and the torsional performance of the trial-produced galvanized steel wire is greatly improved compared with that before heat treatment. However, it does not fully meet the requirements, and the main performance is still torsional performance. Unstable, the uniformity of the wire rod needs to be further improved

Method used

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  • Galvanized steel wire for high-strength and high-torsion bridge cable and its preparation process
  • Galvanized steel wire for high-strength and high-torsion bridge cable and its preparation process
  • Galvanized steel wire for high-strength and high-torsion bridge cable and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This implementation provides a preparation process for galvanized steel wire with a diameter of 7.0mm and a tensile strength of 1960MPa. The specific process is as follows:

[0039] 1) Select high-quality wire rod: choose high-carbon pearlite wire rod with a diameter of 15.0mm, the main components are C: 0.89%, Si: 0.28%, Mn: 0.70%, the surface quality of the wire rod is good, and there is no martensite and bainite body and other abnormal tissues, the tensile strength is 1350MPa, and the surface shrinkage is 32%.

[0040] 2) Single-pass or multi-pass pre-drawing: Pre-drawing is performed on wire rods with a diameter of 15.0 mm. Single-pass drawing is used for single-pass reduction. The reduction rate of a single pass is 12.89%. The drawing speed is 1.5m / s, and the temperature before the pre-drawing die is 35°C, and the temperature after the pre-drawing die is 120°C; the diameter of the wire rod after drawing is 14.0mm; and, observe the pre-drawing coil There is no cont...

Embodiment 2

[0049] This implementation provides a preparation process for galvanized steel wire with a diameter of 6.5mm and a tensile strength of 1960MPa. The specific process is as follows:

[0050] 1) Select high-quality wire rod: choose high-carbon pearlite wire rod with a diameter of 14.0mm, the main components are C: 0.91%, Si: 0.38%, Mn: 0.70%, the surface quality of the wire rod is good, and there is no martensite and bainite body and other abnormal tissues, the tensile strength is 1410MPa, and the surface shrinkage is 30%.

[0051] 2) Single-pass or multi-pass pre-drawing: Pre-drawing is performed on wire rods with a diameter of 14.0 mm. Single-pass drawing is used for single-pass reduction. The reduction rate of a single pass is 13.78%. The drawing speed is 1.2m / s, and the temperature before the pre-drawing die is 30°C, and the temperature after the pre-drawing die is 125°C; the diameter of the wire rod after drawing is 13.0mm; and, observe the pre-drawing coil There is no cont...

Embodiment 3

[0060] This implementation provides a preparation process for galvanized steel wire with a diameter of 5.5mm and a tensile strength of 1860MPa. The specific process is as follows:

[0061] 1) Select high-quality wire rod: choose high-carbon pearlite wire rod with a diameter of 14.0mm, the main components are C: 0.83%, Si: 0.21%, Mn: 0.75%, the surface quality of the wire rod is good, and there is no martensite and bainite body and other abnormal tissues, the tensile strength is 1340MPa, and the surface shrinkage is 35%.

[0062] 2) Single or multi-pass pre-drawing: Pre-drawing is performed on wire rods with a diameter of 14.0mm, and two passes are used for drawing. The diameter of the wire rod after the first drawing is 12.60mm, and the first The reduction rates of the first pass and the second pass are 19.0% and 9.30% respectively, ensuring that the overall reduction of pre-drawing is ≥12%; during the pre-drawing process, the pulling speed is controlled at 1.0m / s, and the Th...

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Abstract

The invention discloses a zinc-coated steel wire for bridge cable with high-strength and high-torsion and preparation technology thereof, and belongs to the technical field of wire rods for bridge cables. The preparation technology comprises the steps that (1) rolled steel wires with high quality are selected; (2) single-pass or multi-pass pre-drawing is carried out, specifically the reduction rate of the single-pass pre-drawing is less than or equal to 20%, and the front-pass reduction rate of the multi-pass pre-drawing is larger than the rear-pass reduction rate of the multi-pass pre-drawing; (3) off-line heat treatment is carried out, specifically heat treatment is carried out on the obtained rolled steel wires of the step (2) by adopting one kind of salt bath, lead bath or water bath;and (4) the finished product zinc-coated steel wire is obtained by throwing. Compared with an existing preparation technology of general rolled steel wires, the designed preparation technology does not change technology parameters of off-line heat treatment and throwing, the operation is simple, and the feasibility is higher; and the tensile strength of the obtained zinc-coated steel wire is not less than 1860 MPa, the number of torsions is not less than 18 times in the torsion performance, and the service requirement of the bridge cables is met.

Description

technical field [0001] The invention relates to a wire rod and a production method thereof, and belongs to the technical field of wire rods for bridge cables, in particular to a galvanized steel wire for high-strength and high-torsion bridge cables and a preparation process thereof. Background technique [0002] High-strength galvanized steel wire is widely used in important occasions such as bridge cables and suspension cables because of its excellent mechanical properties and good anti-corrosion ability. High-strength galvanized steel wire is made of high-carbon pearlitic steel wire rod. First, it undergoes multi-pass continuous cold-drawing deformation to obtain ultra-high-strength steel wire, and then undergoes hot-dip galvanizing treatment to obtain continuous and well-bonded steel wire surface. Hot-dip galvanized layer, so as to obtain good corrosion resistance. [0003] Since the high-strength pearlitic steel wire is plastically deformed with a large amount of deform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/46C21D1/48C21D6/00C21D8/06C21D9/52C22C38/02C22C38/04B21C1/00
CPCB21C1/003C21D1/46C21D1/48C21D6/005C21D6/008C21D8/065C21D9/525C21D2211/009C22C38/02C22C38/04
Inventor 鲁修宇夏艳花任安超张帆丁礼权仇东丽帅习元李建华
Owner 武汉钢铁有限公司
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