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Steel wire rod for 1860 MPa-grade corrosion-resistant steel stranded wire, and production method thereof

A technology of corrosion-resistant steel and production methods, applied in metal rolling and other directions, can solve problems such as high cost and quality problems, achieve good strength and plasticity, improve strength and plasticity, and improve corrosion resistance

Inactive Publication Date: 2018-08-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although galvanizing, epoxy resin and other methods can slow down the degree of corrosion, the cost is too high and there are still some quality problems, so it has not been widely used

Method used

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  • Steel wire rod for 1860 MPa-grade corrosion-resistant steel stranded wire, and production method thereof
  • Steel wire rod for 1860 MPa-grade corrosion-resistant steel stranded wire, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The corrosion-resistant steel strand is smelted with the invented composition of the wire rod, and then cast into a bloom with a section size of 280×380mm, the superheat is 28°C, and the current intensity of the electromagnetic stirring of the crystallizer is 400A. The bloom is heated and rolled into a steel billet with a section size of 180×180mm, and then the steel billet is inspected for flaws, and the position of the surface defect is ground.

[0033] Roll the qualified billet after grinding on a high-speed wire rod mill The rolling process of the wire rod is as follows: heat the billet to 1040°C, keep it warm for 120 minutes, and the temperature difference of the passing rod is 26°C; Silk temperature is 860°C; cool to 640°C at a cooling rate of 10°C / s, then control the cooling rate to 1.5°C / s for pearlite phase transformation, control the pearlite phase transition temperature at 620-670°C, increase cooling after phase transformation Speed, control the cooling rat...

Embodiment 2

[0035] The corrosion-resistant steel strand is smelted with the invented composition of the wire rod, and then cast into a bloom with a section size of 280×380mm, the degree of superheat is 26°C, and the current intensity of the electromagnetic stirring of the crystallizer is 450A. The bloom is heated and rolled into a steel billet with a section size of 180×180mm, and then the steel billet is inspected for flaws and the position of the surface defect is ground.

[0036] Qualified steel billets are rolled on high-speed wire rod mills The rolling process of the wire rod is as follows: heat the steel billet to 1040°C, keep it warm for 110 minutes, and the temperature difference of the passing rod is 27°C; Silk temperature is 870°C; cool to 655°C at a cooling rate of 11°C / s, then control the cooling rate to 2°C / s for pearlite phase transformation, control the pearlite phase transition temperature at 620-670°C, and increase cooling after phase transformation Speed, control the c...

Embodiment 3

[0038] According to the invention composition of corrosion-resistant steel strands, the wire rods are smelted, and then cast into blooms with a cross-sectional size of 280×380mm. The superheat is 29°C, and the current intensity of electromagnetic stirring in the mold is 380A. The bloom is heated and rolled into a steel billet with a section size of 180×180mm, and then the steel billet is inspected for flaws and the position of the surface defect is ground.

[0039] Qualified steel billets are rolled on high-speed wire rod mills The rolling process of the wire rod is as follows: heat the billet to 1050°C, keep it warm for 100 minutes, and the temperature difference of the passing rod is 28°C; Silk temperature is 870°C; cool to 660°C at a cooling rate of 11°C / s, and then control the cooling rate to 2°C / s for pearlite phase transformation, the temperature of pearlite phase transition is controlled at 620-670°C, and increase cooling Speed, control the cooling rate at 8.5°C / s, an...

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Abstract

The invention relates to a steel wire rod for a 1860 MPa-grade corrosion-resistant steel stranded wire, and a production method thereof, wherein the chemical components comprise 0.80-0.85% of C, 0.15-0.35% of Si, 0.60-0.70% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.35-0.40% of Cr, 0.21-0.27% of Cu, and (40-80)*10<-4>% of Ca. According to the production method,the continuous casting superheat is not more than 30 DEG C, and the crystallization device performs electromagnetic stirring; the continuous rolling is performed to obtain the square steel billet withthe size of 100-200 mm; during the rolling, the cleaning rod temperature difference is less than or equal to 30 DEG C; the rolling starting temperature, the fine rolling inlet temperature, the reducing and sizing inlet temperature and the laying temperature are controlled; and the Stelmor air cooling line cooling uses the cooling rate control method comprising strong cooling, weak cooling and strong cooling, and the natural cooling is performed after the cooling is performed to achieve 500 DEG C. According to the present invention, the produced steel wire rod with the diameter of 8-13 mm hasthe tensile strength of 1150-1250 MPa, the elongation of 10-16% and the surface shrinkage of 18-32%, and the corrosion rate of the steel wire rod of the present invention is 70% lower than the corrosion rate of the steel wire rod for the YL82B steel stranded wire under the complete immersion corrosion in the (23 DEG C, 15 d) 5% NaCl solution.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a wire rod for 1860MPa grade high-strength corrosion-resistant steel strand and a production method thereof. Background technique [0002] In the bridge construction of high-speed railways and highways, prestressed beams have been widely used due to their light weight, large span, comfortable driving, good durability, and saving steel and concrete. However, due to non-refined construction factors such as equipment, personnel, and material technology, a series of durability failure accidents of prestressed concrete structures have occurred in recent decades, among which the damage caused by corrosion of prestressed steel strands accounts for the vast majority. Serious consequences have been caused, which has attracted the attention of scholars and engineering circles all over the world. [0003] The corrosion of prestressed steel strands directly aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/20C21D8/08B21B1/46
CPCC22C38/04B21B1/463C21D8/08C21D2211/009C22C38/02C22C38/20
Inventor 马立国郭大勇王秉喜孙振宇杨辉张博高航李建龙袁野孙航
Owner ANGANG STEEL CO LTD