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Wire rod for producting1770Mpa bridge cable galvanized steel wire and method for manufacturing same

A 1770mpa, galvanized steel wire technology, used in manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of high wire-controlled rolling and controlled cooling process control, high silicon content, martensite in wire rods, etc.

Active Publication Date: 2010-05-26
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the high silicon content makes it difficult to control the high-speed wire-controlled rolling and controlled cooling process, which may easily cause harmful structures such as martensite inside the wire rod

Method used

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  • Wire rod for producting1770Mpa bridge cable galvanized steel wire and method for manufacturing same
  • Wire rod for producting1770Mpa bridge cable galvanized steel wire and method for manufacturing same
  • Wire rod for producting1770Mpa bridge cable galvanized steel wire and method for manufacturing same

Examples

Experimental program
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Embodiment 1

[0056] According to the contents of the chemical elements shown in Table 6, desulfurization of molten iron, converter, out-of-furnace refining, ingot pouring, followed by initial rolling soaking, billet opening, large shear head and tail, 6VH continuous rolling 142 2 , cutting to length by flying shears, mechanical cleaning of steel billets, heating in high-speed wire heating furnaces, controlled rolling on high-speed wires, controlled cooling on high-speed Steyrmo lines, wire rod surface inspection, sampling inspection, wire rod bundling, tagging, Storage, delivery. Subsequently, element content determination (see Table 8), steel billet center carbon and center carbon segregation determination (see Table 9), inclusion control measurement (see Table 10), sorbite content and decarburization layer depth control measurement (see Table 11 ).

[0057] Table 6 Chemical elements contained in high carbon steel (0.87%) (wt%)

[0058]

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Abstract

The invention provides a wire rod for a galvanized steel wire of a 1770MPa bridge stay cable comprising the following chemical elements (by wt percentage): C, 0.85 to 0.9; Si, 0.12 to 0.32; Mn, 0.6 to0.9; P, less than or equal to 0.025; S, less than or equal to 0.025; Cr, 0.1 to 0.25; V, less than or equal to 0.06; Cu, less than or equal to 0.1; the rest, inevitable impurity elements. The invention also provides a manufacturing method of the wire rod. The wire rod provided by the invention has the tensile strength Rm of 1300 to 1400 MPa, the elongation after fracture A which is more than or equal to 8 percent, and the contraction of area Z which is more than or equal to 30 percent (after aging, the contraction of area is more than or equal to 35 percent). The galvanized steel wire made ofthe wire rod can completely meet the technical requirements of the galvanized steel wire of the 1770MPa bridge stay cable, such as fatigue tests of high dynamic load (more than or equal to two million cycle-index), high toughness and high torsion (more than or equal to eleven times), etc.

Description

technical field [0001] The invention belongs to the field of welding materials, and more specifically, the invention relates to galvanized steel wires for bridge cables. Background technique [0002] Suspension bridges and cable-stayed bridges are important structural forms of modern long-span bridges. Suspension bridges and cable-stayed bridges are often chosen when erecting super-large bridges with long spans across canyons, bays, large rivers, and other places where piers are not easy to build. bridge type. [0003] The suspension bridge is composed of suspension cables, towers, anchors, booms, stiffening beams and bridge decks. The deck load is transmitted to the suspension cables through the stiffening beams and booms, and then to the towers and anchors at both ends by the suspension cables. Cable-stayed bridges are composed of cables, cable towers, main girders, and bridge decks. The load on the bridge deck is transmitted to the cables through the main girders, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/20C22C38/24C22C33/04C21C7/00B22D11/16B21B37/00C21D8/06C21D11/00
Inventor 周金芳
Owner BAOSHAN IRON & STEEL CO LTD
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