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

A technology of prestressed steel strands and production methods, which is applied in the direction of textiles, papermaking, and textile cables, etc., can solve the problems of decreased strength of steel strands and reduced strengthening effect of wire rod deformation, and achieves the prevention of wire breakage and inhibition The effect of forming and improving the tensile strength

Active Publication Date: 2021-02-02
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, steel wire rod for prestressed steel strand and production method of steel wire rod
  • Prestressed steel strand, steel wire rod for prestressed steel strand and production method of steel wire rod
  • Prestressed steel strand, steel wire rod for prestressed steel strand and production method of steel wire rod

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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 comprises:

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

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

[0033] Stabilization treatment: pre-tensioning the prestressed steel strands and heating them.

[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 strands with a diameter of 21.5-24.2 mm and a tensile strength ≥ 1860 MPa can be prepared by further drawing, twisting, and stabilizing treatment processes with wire rods, preferably Alternatively, the prestressed steel strand with a diameter of 21.5-22.0 mm and a tensile strength ≥ 1960 MPa can also be prepared.

[0035] An ...

Embodiment 1

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

[0045] (2) Molten steel smelting: using a converter for smelting, the tapping temperature is 1645°C, and the tapping carbon content is 0.10%;

[0046] (3) Refining of molten steel: using processes such as bottom blowing argon, refining outside the furnace and soft blowing to regulate the chemical composition of molten steel and reduce inclusions and gas content;

[0047] (4) Continuous casting: full protection pouring is adopted, the mold adopts electromagnetic stirring, the stirring current is 500A, and the frequency is 4.0Hz. 2.0mm and 2.0mm, thus prepared into 140×140mm 2 The continuous casting slab is cleaned, and the continuous casting slab is cleaned; wherein, the superheat of the tundish is 20°C, the amount of nitrogen added in the continuous casting process is ≤0.0002%, and the casting speed is 2.70m≥min;

[0048] The low-magnification inspection of the cross-section of the continuous casting slab shows that the highes...

Embodiment 2

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

[0061] (2) Molten steel smelting: using a converter for smelting, the tapping temperature is 1642°C, and the tapping carbon content is 0.09%;

[0062] (3) Refining of molten steel: using processes such as bottom blowing argon, refining outside the furnace and soft blowing to regulate the chemical composition of molten steel and reduce inclusions and gas content;

[0063] (4) Continuous casting: full protection pouring is adopted, the mold adopts electromagnetic stirring, the stirring current is 500A, and the frequency is 4.0Hz. 2.0mm and 2.0mm, thus prepared into 140×140mm 2 The continuous casting slab is cleaned, and the continuous casting slab is cleaned; wherein, the superheat of the tundish is 18°C, the amount of nitrogen added in the continuous casting process is ≤0.0002%, and the casting speed is 2.70m≥min;

[0064] The low-magnification inspection of the cross-section of the continuous casting slab shows that the highes...

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Abstract

The invention discloses a prestressed steel strand, a steel wire rod for the prestressed steel strand and a production method of the steel wire rod. The steel wire rod for the prestressed steel strandis prepared from the following chemical components in percentage by mass: 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, 0.01-0.03% of Al, less than or equalto 0.05% of Ti, less than or equal to 0.0020% of B, less than or equal to 0.10% of Cu, less than or equal to 0.10% of Ni, and the balance of Fe and inevitable impurity elements. According to the steelwire rod, the diameter is 16 mm, the tensile strength is 1320-1380 MPa, the percentage reduction of area is greater than or equal to 28%, and the percentage elongation after fracture is greater thanor equal to 10%. The steel wire rod can be used as a base material for producing the prestressed steel strand with the diameter of 21.5-24.2 mm and the tensile strength of greater than or equal to 1860 MPa, and can further be used as the base material for producing the prestressed steel strand with the diameter of 21.5-22.0 mm and the tensile strength of greater than or equal to 1960 MPa. The production method comprises the steps of molten iron pre-desulfurization, molten steel smelting, molten steel refining, continuous casting, high-speed wire rolling, temperature control cooling and coil collection. By combining control over the chemical components and proportions, the abnormal structure of network carbide is controlled, and the tensile strength, the percentage elongation after fractureand other properties of products are improved.

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 strand, a prestressed steel strand further processed from the wire rod for prestressed steel strand, and a prestressed steel strand Production method of wire rod for steel strand. Background technique [0002] Prestressed steel strand is an important load-bearing material, mainly used in bridges, railways, highways, airports, exhibition halls, large industrial buildings, mines, water conservancy, energy and geotechnical anchoring and other large-scale projects, with high tensile strength, Good elongation, low relaxation value, small stress loss, excellent fatigue resistance and so on. With the continuous advancement of engineering technology, the requirements for prestressed steel strands are getting higher and higher, and the prestressed steel strands are often required to have greater bearing capacity and longer service life. [...

Claims

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Application Information

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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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