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High-N composite reinforced 500MPa-grade and 600MPa-grade steel bar, smelting method and production method

A technology of smelting method and production method, which is applied in the manufacture of converters, etc., can solve the problems of high consumption, high cost, and high cost, and achieve the effects of improving the strength-to-yield ratio and ultimate strength, saving precious metal resources, and reducing production costs

Inactive Publication Date: 2020-06-26
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the production of HRB500(E) and HTRB600(E) steel bars uses "vanadium nitrogen + ferroniobium" composite microalloying, the V content in the steel is 0.060%-0.150%, the nitrogen content is 100-200ppm, the nitrogen content is low, V(N, C ) The precipitation strengthening effect is not fully exerted. According to theoretical calculations, the nitrogen content should be 150-280ppm, which results in high consumption and high cost of vanadium nitrogen alloy
And when the vanadium content exceeds 0.10%, it will lead to V / N ratio > 5, which is much higher than its ideal ratio, and the strengthening effect of vanadium cannot be fully exerted.
At present, the existing technology cannot realize the control of V / N ratio while reducing the high consumption and high cost of vanadium nitrogen alloy

Method used

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  • High-N composite reinforced 500MPa-grade and 600MPa-grade steel bar, smelting method and production method
  • High-N composite reinforced 500MPa-grade and 600MPa-grade steel bar, smelting method and production method
  • High-N composite reinforced 500MPa-grade and 600MPa-grade steel bar, smelting method and production method

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Effect test

Embodiment 1

[0050] Table 1 is a chemical composition comparison table between the 500MPa grade steel bars produced by the smelting method of high N composite strengthening 500MPa grade and 600MPa grade steel bars according to the present invention and the 500MPa grade steel bars produced by the prior art. Table 2 is a comparison of the mechanical properties of the 500MPa steel bar produced by the present invention and the 500MPa steel bar produced by the prior art. In Table 2, Rm is the tensile strength, Rel is the lower yield strength, A is the elongation after fracture, and Agt is the elongation.

[0051] Table 1

[0052]

[0053] Table 2

[0054]

[0055]

[0056] It can be seen from Table 1 and Table 2 that by controlling the V / N at 3.49, 3.56, 3.83, and when the niobium content is 0.015%, the smelted billet is rolled to obtain the corresponding mechanical properties. After comparison, the V / N is at The performance is the most stable at 3.56, and the utilization effect of V...

Embodiment 2

[0061] Table 4 is a chemical composition comparison table between the 600MPa grade steel bars produced by the smelting method of high N composite strengthening 500MPa grade and 600MPa grade steel bars according to the present invention and the 600MPa grade steel bars produced by the prior art. Table 5 is a comparison of the mechanical properties of the 600MPa steel bar produced by the present invention and the 600MPa steel bar produced by the prior art.

[0062] Table 4

[0063]

[0064] table 5

[0065]

[0066]

[0067] It can be seen from Table 4 and Table 5 that by controlling the V / N at 3.49, 3.56, 3.83, and controlling the niobium content at 0.015%, 0.020%, and 0.025%, the smelted billets are rolled to obtain the corresponding mechanical properties. In contrast, when V / N is 3.56, the performance is the most stable, and the utilization effect of V and Nb is the best. Compared with the traditional VN alloy and ferroniobium, the yield strength has been significan...

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Abstract

The invention provides a high-N composite reinforced 500MPa-grade and 600MPa-grade steel bar, a smelting method and a production method. Smelting is conducted by adopting a smelting process, in the converter smelting tapping process, according to the amount of 2.5-4.0 kg per ton of steel, high-nitrogen ferrovanadium alloy FeV30N14 with N being 14%-16% in content, V being 29%-31% in content and thebalance Fe and inevitable impurities is added, according to the amount of 0.2-0.25 kg per ton of steel, ferroniobium with Nb being 63.0%-65% in content by weight percentage is added, so that the V / Nratio of molten steel is controlled to be 3.49-3.83. According to the high-N composite reinforced 500MPa-grade and 600MPa-grade steel bar, the smelting method and the production method, vanadium nitrogen and ferroniobium in the prior art are replaced with the high-nitrogen ferrovanadium alloy (FeV30N14) and the ferroniobium, so that the nitrogen content in the steel just reaches a theoretical value, the V (N, C) precipitation strengthening effect is fully exerted, and the purposes of saving vanadium and reducing the cost are achieved.

Description

technical field [0001] The invention relates to the technical field of steel bar manufacturing technology, in particular to a high-N composite reinforced 500MPa-grade and 600MPa-grade steel bar, a smelting method and a production method. Background technique [0002] The 500MPa and 600MPa grade high-strength steel bars are the current domestic high-grade steel bars and are widely used in various building structures, especially large, heavy, light thin-walled and high-rise building structures. Compared with 400MPa grade steel bars, the use of 500MPa, 600MPa grade and above high-strength steel bars can save steel consumption by 17.5% and more than 30%. Its development and application will also promote the promotion and application of high-performance energy-saving and environmentally friendly new materials, greatly improve the current structure of building products, and provide strong support for the realization of resource-saving and environment-friendly enterprises. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/04C22C38/02C22C33/06C21C5/28C21D8/08
CPCC21C5/28C21D8/065C21D8/08C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/12
Inventor 马正洪黄沁王哲蒋鹏李孟雄郝开兴彭勇周聪邱代兵王晓兰李辉
Owner JIANGSU YONGGANG GROUP CO LTD
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