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Ultrahigh-strength vanadium-titanium composite microalloyed high carbon steel wire rod and preparation method thereof

An ultra-high-strength, micro-alloying technology, applied in the field of iron and steel metallurgy, can solve the problems of serious nitrogen increase, nozzle nodulation, etc., and achieve the effects of low cost, simple production process, and broad market prospects

Active Publication Date: 2012-02-15
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The micro-alloying elements of existing high-carbon steel wire rods mainly use V, Al and Cr. For billet continuous casting, Al is easy to cause nozzle nodules, which affects normal production. Nitrogen increase is serious in the process of electric furnace smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1 was produced according to the above-mentioned process, and the actual chemical composition and weight ratio of the finished wire rod were: C: 0.87%; Si: 0.91%; Mn: 0.68%; P: 0.007%; S: 0.003%; V Ti: 0.038%; Cr: 0.19%; Cu: 0.12%; Ni: 0.05%; O: 15ppm; N: 60ppm; Al: 0.018; Ca: 8ppm. The production process adopts the route of "electric furnace smelting + billet continuous casting and rolling". The smelting process uses a 100-ton ultra-high-power electric furnace with a total charge of about 110 tons. The raw material uses 45 tons of molten iron, and the rest is scrap steel that has been selected and sorted. And use slag smelting; the end point carbon content is 0.18%. Ferrosilicon and silicon-manganese alloys are added for deoxidation when the tapping progresses to 1 / 4, and carbon powder and slagging material are added. During the tapping process, the argon stirring is controlled at 0.5-0.1MPa, and gradually decreases according to the tapping amount. During the ...

Embodiment 2

[0048] Example 2 was produced according to the above-mentioned process, and the actual tested chemical composition and weight ratio of the finished wire rod were: C: 0.86%; Si: 0.86%; Mn: 0.70%; P: 0.006%; S: 0.001%; ​​V : 0.082%; Ti: 0.032%; Cr: 0.20%; Cu: 0.09%; Ni: 0.03%; O: 16ppm; N: 55ppm; B: 13ppm. The production process adopts the route of "electric furnace smelting + billet continuous casting and rolling". The smelting process uses a 100-ton ultra-high-power electric furnace with a total charge of about 110 tons. The raw material uses 48 tons of molten iron, and the rest is scrap steel that has been selected and sorted. And use slag smelting; the end point carbon content is 0.21%. Ferrosilicon and silicon-manganese alloys are added for deoxidation when the tapping progresses to 1 / 4, and carbon powder and slagging material are added. During the tapping process, the argon stirring is controlled at 0.5-0.1MPa, and gradually decreases according to the tapping amount. Dur...

Embodiment 3

[0051]Example 3 was produced according to the above-mentioned process, and the actual chemical composition and weight ratio of the finished wire rod were: C: 0.88%; Si: 0.98%; Mn: 0.75%; P: 0.010%; S: 0.005%; V : 0.068%; Ti: 0.027%; Cr: 0.22%; Cu: 0.09%; Ni: 0.04%; O: 15 ppm; N: 62 ppm; Ca: 9 ppm. The production process adopts the route of "electric furnace smelting + billet continuous casting and rolling". The smelting process uses a 100-ton ultra-high-power electric furnace with a total charge of about 110 tons. The raw material uses 52 tons of molten iron, and the rest is scrap steel that has been selected and sorted. And use flow slag smelting; the final carbon content is 0.15%. Ferrosilicon and silicon-manganese alloys are added for deoxidation when the tapping progresses to 1 / 4, and carbon powder and slagging material are added. During the tapping process, the argon stirring is controlled at 0.5-0.1MPa, and gradually decreases according to the tapping amount. During th...

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Abstract

The invention discloses an ultrahigh-strength vanadium-titanium composite microalloyed high carbon steel wire rod and a preparation method thereof. The wire rod is prepared by the vanadium-titanium composite microalloying technology. The high carbon steel wire rod contains basic components such as C, Si, Mn, P, S, V, Ti, Cr, Cu, Ni, O and N and optional components such as Al, Ca, B and Mg and also contains the balance of iron and impurities. The preparation method comprises the following working procedures of: performing electric furnace smelting, refining, performing continuous casting, rolling and cooling. The diameter of the wire rod is 11-15mm, the tensile strength Rm is 1330-1410MPa, the average tensile strength is 1380MPa and the section shrinkage rate Z is no less than 32%. The tensile strength of the 15.2mm prestressed steel strand produced by the low-alloyed high carbon steel wire rod is more than 2140MPa, the tensile strength of the 15.2mm galvanized steel strand is more than 1960MPa and the tensile strength of the 7mm galvanized steel wire is more than 1860MPa.

Description

technical field [0001] The invention particularly relates to an ultra-high-strength vanadium-titanium composite micro-alloyed high-carbon steel wire rod, which is suitable for producing ultra-high-strength prestressed steel strands, galvanized steel strands and galvanized steel wire series products, and belongs to the technical field of iron and steel metallurgy . Background technique [0002] High-carbon steel wire rods are mainly used to produce prestressed steel strands, galvanized steel wires, steel-cored aluminum strands, steel wire ropes, spring steel wires, piano steel wires and other products. During the production of steel wires, high-carbon steel wire rods need to be processed in multiple passes. Drawing, the area reduction rate reaches 64-96%. Therefore, there are high requirements on the strength, area shrinkage, elongation, surface quality, and purity of the original wire rod. At present, the prestressed steel strands in the domestic market are mainly 1860MPa g...

Claims

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Application Information

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IPC IPC(8): C22C38/50C22C38/54C21C5/52C21C7/04C22C33/06B22D11/16C21D8/06C21D11/00
CPCY02P10/20
Inventor 麻晗王雷李平
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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