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Prestressed steel strand, wire rod for prestressed steel strand and production method thereof

A technology of prestressed steel strands and production methods, which can be applied to textiles, papermaking, textile cables, etc., and can solve the problems of reduced deformation strengthening effect of wire rods and decreased strength of steel strands, etc.

Active Publication Date: 2022-06-21
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the diameter is an important measure to improve the bearing capacity of the prestressed steel strand, but when the diameter of the steel strand increases to a certain extent, the deformation strengthening effect of the wire rod decreases, and the strength of the steel strand decreases instead.

Method used

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  • Prestressed steel strand, wire rod for prestressed steel strand and production method thereof
  • Prestressed steel strand, wire rod for prestressed steel strand and production method thereof
  • Prestressed steel strand, wire rod for prestressed steel strand and production method thereof

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Experimental program
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Effect test

preparation example Construction

[0030] Specifically, the preparation method of the prestressed steel strand includes:

[0031] Drawing: drawing the prestressed steel strand into a central steel wire and a surface steel wire from a wire rod;

[0032] Twisting strands: twist six of the surface steel wires around one of the central steel wires into strands to obtain a prestressed steel strand with a 1×7 structure;

[0033] Stabilization treatment: the prestressed steel strand is pretensioned and heated.

[0034]That is to say, the prestressed steel strand can be prepared by further drawing, twisting and stabilizing the wire rod for the prestressed steel strand. For example, the prestressed steel strand with a diameter of 21.5-24.2 mm and a tensile strength of ≥1860 MPa can be prepared by further drawing, twisting and stabilizing the wire rod for the prestressed steel strand, preferably In addition, the prestressed steel strand with a diameter of 21.5-22.0 mm and a tensile strength of ≥1960 MPa can also be pre...

Embodiment 1

[0044] (1) Pre-desulfurization of molten iron;

[0045] (2) molten steel smelting: adopt converter smelting, the tapping temperature is 1645 ℃, and the carbon content of tapping is 0.10%;

[0046] (3) Refining of molten steel: The process of bottom blowing argon, out-of-furnace refining and soft blowing is used to control the chemical composition of molten steel and reduce the content of inclusions and gases;

[0047] (4) Continuous casting: casting with full protection, using electromagnetic stirring for the crystallizer, stirring current of 500A, frequency of 4.0Hz, continuous casting with four rolls of light reduction, the reductions of the four rolls are 1.0mm, 3.0mm, 2.0mm and 2.0mm to make 140×140mm 2 The continuous casting billet is cleaned, and the superheat degree of the tundish is 20 °C, the nitrogen increase in the continuous casting process is ≤0.0002%, and the pulling speed is 2.70m≥min;

[0048] The low magnification inspection of the cross section of the conti...

Embodiment 2

[0060] (1) Pre-desulfurization of molten iron;

[0061] (2) molten steel smelting: adopt converter smelting, the tapping temperature is 1642 ℃, and the carbon content of tapping is 0.09%;

[0062] (3) Refining of molten steel: The process of bottom blowing argon, out-of-furnace refining and soft blowing is used to control the chemical composition of molten steel and reduce the content of inclusions and gases;

[0063] (4) Continuous casting: casting with full protection, using electromagnetic stirring for the crystallizer, stirring current of 500A, frequency of 4.0Hz, continuous casting with four rolls of light reduction, the reductions of the four rolls are 1.0mm, 3.0mm, 2.0mm and 2.0mm to make 140×140mm 2 The continuous casting billet is cleaned, and the superheat degree of the tundish is 18°C, the nitrogen increase in the continuous casting process is ≤0.0002%, and the pulling speed is 2.70m≥min;

[0064] The low magnification inspection of the cross section of the contin...

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Abstract

The invention discloses a prestressed steel strand, a wire rod for the prestressed steel strand and a production method thereof. The chemical composition of the wire rod for prestressed steel strand includes: 0.90-0.95% of C, 0.20-0.40% of Si, 0.70-0.85% of Mn, 0.25-0.35% of Cr, 0.04-0.08% of V, Al 0.01~0.03%, Ti≤0.05%, B≤0.0020%, Cu≤0.10%, Ni≤0.10%, the rest is Fe and unavoidable impurity elements, its diameter is 16mm, the tensile strength is 1320~1380MPa, and the section shrinkage rate ≥ 28%, elongation after breaking ≥ 10%, not only can be used as the base material for the production of prestressed steel strands with a diameter of 21.5-24.2mm and a tensile strength ≥ 1860MPa, but also can be used as a prestressed steel strand with a diameter of 21.5-22.0mm, Base material for the production of prestressed steel strands with tensile strength ≥ 1960MPa. The production method includes pre-desulfurization of molten iron, molten steel smelting, molten steel refining, continuous casting, high-speed wire rolling, temperature-controlled cooling and coil collection processes, combined with the control of chemical composition and proportion, the abnormal structure of network carbide is controlled, and the product is improved. tensile strength, elongation after break and other properties.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a wire rod for prestressed steel strands, a prestressed steel strand further processed from the wire rods for prestressed steel strands, and a prestressed steel wire rod. Production method of wire rod for steel strand. Background technique [0002] Prestressed steel strand is an important bearing material, mainly used in large-scale projects such as bridges, railways, highways, airports, exhibition halls, large industrial buildings, mines, water conservancy, energy and geotechnical anchoring. It has the characteristics of good elongation, low relaxation value, small stress loss and excellent fatigue resistance. With the continuous advancement of engineering technology, the requirements for prestressed steel strands are getting higher and higher, and prestressed steel strands are often required to have greater bearing capacity and longer service life. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/46C22C38/50C22C38/42C22C38/54D07B1/06
CPCC22C38/02C22C38/04C22C38/06C22C38/46C22C38/50C22C38/42C22C38/54D07B1/06D07B2201/2009
Inventor 麻晗李建华
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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