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High-strength steel wire rod with good low-temperature impact toughness and production method thereof

A technology of low temperature impact toughness and production method, applied in the field of steel wire rods, can solve problems such as cost increase, and achieve the effects of low use cost, fine grain size, high material strength and toughness

Inactive Publication Date: 2016-08-24
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Application No. 201310054382.1 discloses "a method of improving the low-temperature impact toughness of 40CrNiMoA material", which meets the impact energy requirements of low temperature -80°C by performing cryogenic and low-temperature tempering treatment on the wire rod; but compared with the conventional downstream heat treatment process Compared with that, the cost increases, and the precious Ni is added from the grade display

Method used

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  • High-strength steel wire rod with good low-temperature impact toughness and production method thereof
  • High-strength steel wire rod with good low-temperature impact toughness and production method thereof
  • High-strength steel wire rod with good low-temperature impact toughness and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The high-strength steel wire rod with good low-temperature impact toughness adopts the following production method.

[0025] (1) Smelting and continuous casting process: molten steel is smelted and continuously cast into steel slabs, its composition by weight percentage is: C 0.35%, Si 0.19%, Mn 0.83%, P 0.020%, S 0.020%, Cr 0.94%, Mo 0.19 %, and the rest is iron.

[0026] (2) Heating process: heating the steel billet to 1000°C, holding time for 120min.

[0027] (3) Rolling process and silk spinning process: the dephosphorized steel billet is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finish rolling, 8 passes of finish rolling, and the temperature of advance and finish rolling is 875°C. Sizing; after finishing rolling, the spinning temperature is controlled at 850°C.

[0028] (4) Cooling process: enter the Stelmore cooling line, adjust the number of openings of the air-cooling line insulation cover and the opening of the f...

Embodiment 2

[0029] Embodiment 2: The high-strength steel wire rod with good low-temperature impact toughness adopts the following production method.

[0030] (1) Smelting and continuous casting process: molten steel is smelted and continuously cast into steel slabs, its composition by weight percentage is: C 0.38%, Si 0.20%, Mn 0.85%, P 0.018%, S 0.020%, Cr 0.95%, Mo 0.20 %, and the rest is iron.

[0031] (2) Heating process: heating the steel billet to 1050°C, holding time for 115min.

[0032] (3) Rolling process and silk spinning process: the dephosphorized steel billet is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finish rolling, 8 passes of finish rolling, and the temperature of advance and finish rolling is 873°C. After sizing and finishing rolling, the spinning temperature is controlled at 840°C.

[0033] (4) Cooling process: enter the Stelmore cooling line, adjust the number of openings of the air-cooling line insulation cover and the opening of th...

Embodiment 3

[0034] Embodiment 3: The high-strength steel wire rod with good low-temperature impact toughness adopts the following production method.

[0035] (1) Smelting and continuous casting process: molten steel is smelted and continuously cast into billets, the composition of which is by weight percentage: C 0.42%, Si 0.19%, Mn 0.84%, P 0.020%, S 0.018%, Cr 0.93%, Mo 0.19 %, and the rest is iron.

[0036] (2) Heating process: heating the billet to 1100°C, holding time for 110min.

[0037] (3) Rolling process and silk spinning process: the dephosphorized steel billet is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finish rolling, 8 passes of finish rolling, and the temperature of advance and finish rolling is 880°C. After sizing and finishing rolling, the spinning temperature is controlled at 845°C.

[0038] (4) Cooling process: enter the Stelmore cooling line, adjust the number of openings of the air-cooling line insulation cover and the opening of the...

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Abstract

The invention discloses a high-strength steel wire rod with good low temperature impact toughness and a production method of the high-strength steel wire rod. The high-strength steel wire rod contains the following steel type components by weight percent: 0.30%-0.50% of C, 0.10%-0.40% of Si, 0.70%-1.00% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.70%-1.20% of Cr, 0.10 %-0.30% of Mo, and the balance of Fe and trace impurities. The high-strength steel wire rod contains small and uniform in crystalline grains, and is low in ductile-brittle transition temperature, and has high material strength and toughness. The high-strength steel wire rod is free of other precious metals, is low in heat treatment cost, and has the characteristics of low production cost and low using cost. The method controls the austenitizing degree and phase change temperature by adjusting the temperatures of heating, finish rolling and spinning, as well as cooling speed, and the low temperature impact toughness of the product is improved by improving the grain size of the product and reducing the ductile-brittle transition temperature. The method does not need to increase equipment or investment, does not increase the production cost, and makes full use of existing equipment and process, so that the method has the characteristics of low cost and low product use cost.

Description

technical field [0001] The invention relates to a steel wire rod, in particular to a high-strength steel wire rod with good low-temperature impact toughness and a production method thereof. Background technique [0002] With the increasingly prominent environmental protection problems in our country and the increasingly tense energy supply, wind power generation, as one of the energy-saving and environmentally friendly renewable energy generation methods, has become more and more popular. Wind power is not limited to the development of land platforms, but is moving towards ocean platforms. With the development of the wind power industry, the production of high-strength bolts for wind power generation equipment is also facing unprecedented challenges. With the expansion of wind power installed capacity, the requirements for performance indicators of high-strength bolts are also getting higher and higher, not only requiring high strength , At the same time, the requirements f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C21D8/06
Inventor 陈继林田新中阴峻峰张治广刘振民李军郭明仪戴永刚回士旭崔延文宋秀果贾东涛钟保军李宝秀
Owner XINGTAI IRON & STEEL
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