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Boron-containing high-end cord steel and production method thereof

A kind of high-end technology for cord steel, applied in the field of boron-containing high-end cord steel and its production, can solve the problems of long cycle, increased production cost, slow production pace, etc., and achieve the effect of non-decarburized structure and uniform structure

Inactive Publication Date: 2017-01-18
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are that it needs to go back and forth twice to refine in the LF furnace, the cycle is too long, the production rhythm is slow, and the production cost increases; the second is that it cannot meet the production of 92 grades; the third is that this method is mainly for the purpose of export tax rebate
Its disadvantages are that it can only produce cord steel below 90 grades, and cannot meet the production of higher grade cord steels; the second is that it needs to go through two rolling processes, which increases the production cost; the third is that the heating process in the rolling process Wide temperature range, detrimental to uniformity of properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A boron-containing high-end cord steel, its chemical composition by weight is: C: 0.92%, Si: 0.19%, Mn: 0.38%, P: 0.008%, S: 0.005%, Cu: 0.035%, Ni: 0.044 %, Cr: 0.23%, Als: 0.00275%, Mo: 0.018%, B: 0.0017%, and the rest are Fe and impurity elements.

[0018] Its production method includes the steps of molten iron desulfurization, converter smelting, refining, continuous casting, billet heating, hot continuous rolling, cooling, and coil collection, wherein:

[0019] During converter smelting, the weight percent content of V, Ti and Nb in molten iron entering the furnace is controlled to be ≤0.05%, and the weight percent content of S out of the station is ≤0.025%; 0.18%; stop slag and tap, ladle slag layer thickness 46mm; adopt outside furnace alloying, when tapping about 1 / 4 of steel, add silicon manganese ferromanganese, silicon carbide and recarburizer along with steel flow; when molten steel reaches 3 / 4 , the alloy must be added in its entirety, and C, Si, and Mn ar...

Embodiment 2

[0025] A boron-containing high-end cord steel, its chemical composition by weight is: C: 0.913%, Si: 0.21%, Mn: 0.32%, P: 0.005%, S: 0.003%, Cu: 0.022%, Ni: 0.028 %, Cr: 0.28%, Als: 0.00235%, Mo: 0.011%, B: 0.0023%, and the rest are Fe and impurity elements.

[0026] Its production method includes the steps of molten iron desulfurization, converter smelting, refining, continuous casting, billet heating, hot continuous rolling, cooling, and coil collection, wherein:

[0027] During converter smelting, the weight percentage content of V, Ti and Nb in the furnace molten iron is controlled to be 0.017%, and the weight percentage content of S out of the station is 0.23%; When about 1 / 4, ferrosilicon manganese, silicon carbide and recarburizer are added along with the steel flow; when the molten steel reaches 3 / 4, all alloys must be added, and C, Si, and Mn are controlled according to the middle limit of the composition range. 5.4kg of active lime and 0.83kg of fluorite per ton of ...

Embodiment 3

[0033] A boron-containing high-end cord steel, its chemical composition by weight is: C: 0.90%, Si: 0.14%, Mn: 0.40%, P: 0.008%, S: 0.008%, Cu: 0.022%, Ni: 0.027 %, Cr: 0.27%, Als: 0.00277%, Mo: 0.02%, B: 0.0030%, and the rest are Fe and impurity elements.

[0034] Its production method includes the steps of molten iron desulfurization, converter smelting, refining, continuous casting, billet heating, hot continuous rolling, cooling, and coil collection, wherein:

[0035] During converter smelting, the weight percentage content of V, Ti and Nb in molten iron entering the furnace is controlled to be ≤0.05, and the weight percentage content of S out of the station is 0.008%; Steel, the thickness of the ladle slag layer is 63mm; outside the furnace is used for alloying, when about 1 / 4 of the steel is tapped, ferrosilicomanganese, silicon carbide and carburizing agent are added along with the steel flow; when the molten steel is tapped to 3 / 4, the alloy must be fully added, C, Si...

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PUM

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Abstract

The invention provides boron-containing high-end cord steel and a production method thereof. The boron-containing high-end cord steel comprises, by weight, 0.89%-0.96% of C, 0.14%-0.30% of Si, 0.3%-0.6% of Mn, 0.025% or less of P, 0.025% or less of S, 0.08% or less of Cu, 0.08% or less of Ni, 0.10%-0.50% of Cr, 0.001%-0.008% of Als, 0.08% or less of Mo, 0.0008%-0.0035% of B, and the balance Fe and impurity elements. The production method comprises the steps of molten iron desulphurization, smelting with a converter, refining, continuous casting, billet heating, hot continuous rolling, cooling and coil collection. The practice proves that various performance indexes of the cord steel 92A produced according to the method meet the user standard requirements, and a strand of a hundred thousand meters has no broken wire. Compared with the prior art, the bridge cable steel produced according to the method is even in structure, free of segregation, and free of a decarburized structure on the surface, and the sorbite rate reaches 95%.

Description

technical field [0001] The invention belongs to the technical field of cord steel production, and specifically refers to a boron-containing high-end cord steel and a production method thereof. Background technique [0002] Cord steel is a kind of high-strength high-carbon steel with special purpose, which can improve tire strength, toughness and fatigue resistance. Raw materials for tires and other rubber product skeleton materials. With the weight reduction of automobiles and the improvement of car safety, the strength level of car tire cord steel wires is also increasing. At the same time, good drawing performance is extremely critical for the production of steel cords. , and the inevitable existence of nitrogen, oxygen and some other elements that cannot be removed in steel, due to their solid solution strengthening effect, will increase the strength of the wire and seriously reduce the plasticity, especially limiting the drawability of the wire. [0003] After searching...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C22C38/32C22C33/04
Inventor 徐志东桂江兵任安超叶途明李媛蒋跃东吴杰张帆卢正东
Owner 武汉钢铁有限公司