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NbV composite microalloyed HRB400E steel bar and production process

A micro-alloying and production process technology, applied in the field of metallurgy, can solve the problems of high cost, inconspicuous yield platform, lower limit of the yield strength value of steel bars, etc., to achieve stable tensile strength performance, obvious and stable yield platform, cold bending Good effect of reverse bending performance

Inactive Publication Date: 2018-12-18
宣化钢铁集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The national standard GB-T 1499.2-2018 stipulates the composition control of HRB400E steel bars, but there are no detailed regulations on its production process. The current mature technology is produced by Nb or V microalloying process. Due to the rising price of vanadium raw materials, pure vanadium microalloying However, the yield strength value of steel bars purely using niobium microalloying is lower than the lower limit and the yield platform is not obvious. Niobium vanadium composite microalloying can effectively make up for these two deficiencies, which can not only ensure the performance of steel bars, but also can Reduce costs and provide a good direction for the production of rebar products
[0003] Although the NbV composite microalloying process has cost + quality advantages, no steel mills have been seen to carry out substantial production technology research and development work

Method used

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  • NbV composite microalloyed HRB400E steel bar and production process
  • NbV composite microalloyed HRB400E steel bar and production process
  • NbV composite microalloyed HRB400E steel bar and production process

Examples

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Effect test

Embodiment 1

[0025] In this example, the specification of NbV composite microalloyed HRB400E steel bar is Φ12mm four-section steel bar, and its chemical composition and mass percentage are: C: 0.21%, Si: 0.35%, Mn: 1.36%, P: 0.028%, S : 0.015%, Nb: 0.018%, V: 0.012%, N: 64ppm, O: 43ppm, and the balance is Fe and unavoidable impurities.

[0026] The production technology of the present embodiment NbV composite microalloyed HRB400E steel bar comprises smelting, continuous casting, rolling process, and concrete process step is as follows:

[0027] (1) Smelting process: use top-bottom composite converter smelting, converter top-bottom blowing adopts nitrogen-argon switching process; converter deoxidation alloying, carburant uses 0.78kg / t steel petroleum coke, alloying uses 20kg / t steel Silicon manganese, 1.0kg / t steel ferrosilicon, 0.28kg / t steel FeNb60-B, 0.20kg / t steel FeV50-A, deoxidizer using 0.5kg / t steel silicon aluminum barium strontium; end point control using high Carbon drawing proc...

Embodiment 2

[0034] The specification of the NbV composite microalloyed HRB400E steel bar in this example is a Φ14mm three-section steel bar, and its chemical composition and mass percentage are: C: 0.20%, Si: 0.36%, Mn: 1.35%, P: 0.032%, S : 0.028%, Nb: 0.019%, V: 0.011%, N: 62ppm, O: 45ppm, and the balance is Fe and unavoidable impurities.

[0035] The production technology of the present embodiment NbV composite microalloyed HRB400E steel bar comprises smelting, continuous casting, rolling process, and concrete process step is as follows:

[0036] (1) Smelting process: use top-bottom compound converter smelting, converter top-bottom blowing adopts nitrogen-argon switching process; converter deoxidation alloying, carburant uses 0.70kg / t steel petroleum coke, alloying uses 20kg / t steel Silicon manganese, 1.0kg / t steel ferrosilicon, 0.30kg / t steel FeNb60-B, 0.18kg / t steel FeV50-A, deoxidizer using 0.8kg / t steel silicon aluminum barium strontium; end point control using high Carbon drawing...

Embodiment 3

[0043] The specification of the NbV composite microalloyed HRB400E steel bar in this example is a Φ16mm two-cut steel bar, and its chemical composition and mass percentage are: C: 0.21%, Si: 0.37%, Mn: 1.34%, P: 0.029%, S : 0.025%, Nb: 0.017%, V: 0.013%, N: 65ppm, O: 41ppm, and the balance is Fe and unavoidable impurities.

[0044] The production technology of the present embodiment NbV composite microalloyed HRB400E steel bar comprises smelting, continuous casting, rolling process, and concrete process step is as follows:

[0045] (1) Smelting process: use top-bottom compound converter smelting, converter top-bottom reblowing adopts nitrogen-argon switching process; converter deoxidation alloying, carburant uses 0.8kg / t steel petroleum coke, alloying uses 19.5kg / t steel silicon manganese, 1.1kg / t steel ferrosilicon, 0.27kg / t steel FeNb60-B, 0.22kg / t steel FeV50-A, deoxidizer uses 0.5kg / t steel silicon aluminum barium strontium; end point control adopts High carbon process, c...

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Abstract

The invention discloses an NbV composite microalloyed HRB400E steel bar and a production process. The NbV composite microalloyed HRB400E steel bar comprises the chemical composition of, by mass, 0.19-0.21% of C, 0.32-0.38% of Si, 1.33-1.38% of Mn, less than or equal to 0.041% of P, less than or equal to 0.041% of S, 0.017-0.019% of Nb, 0.010-0.014% of V, 50-70ppm of N, less than or equal to 50ppmof O, and the balance Fe and inevitable impurities. The production process includes the steps of smelting, continuous casting and rolling. The NbV composite microalloyed HRB400E steel bar produced bythe production process has a metallographic structure of F+P+B and the grain size of 8.0-8.5 grades, the yield platform is obvious, the surface of the steel bar is provided with dense Fe3O4 structures, the grain structure is refined, and the welding performance, cold bending performance, fatigue limit performance and oxidation resistance of the steel bar are superior to the performance of steel bars simply using a Nb or V alloy.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a NbV composite microalloyed HRB400E steel bar and a production process. Background technique [0002] The national standard GB-T 1499.2-2018 stipulates the composition control of HRB400E steel bars, but there are no detailed regulations on its production process. The current mature technology is produced by Nb or V microalloying process. Due to the rising price of vanadium raw materials, pure vanadium microalloying However, the yield strength value of steel bars purely using niobium microalloying is lower than the lower limit and the yield platform is not obvious. Niobium vanadium composite microalloying can effectively make up for these two deficiencies, which can not only ensure the performance of steel bars, but also can Cost reduction provides a good direction for the production of rebar products. [0003] Although the NbV composite microalloying process has ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D8/08
CPCC21D8/065C21D8/08C21D2211/002C21D2211/005C21D2211/009C22C38/001C22C38/002C22C38/02C22C38/04C22C38/12
Inventor 邓建新贾建平孙贵平王建忠贾明雪赵晓锋王晓娣尹志强王新路
Owner 宣化钢铁集团有限责任公司
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