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A kind of high-strength anti-seismic steel bar and its production method

The technology of an earthquake-resistant steel bar and a production method, which is applied in the field of high-strength earthquake-resistant steel bar, can solve the problems of unfavorable production and popularization and application of HRB500 high-strength steel bar, strict requirements on chemical composition and rolling temperature, and large amount of vanadium or niobium alloy. Achieve the effect of being conducive to protection and rational utilization, promotion and application promotion, and strict control requirements

Active Publication Date: 2016-05-25
WUKUN STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of HRB500 high-strength steel bars in domestic steel mills mainly adopts vanadium-nitrogen micro-alloying or vanadium-niobium composite micro-alloying hot rolling process. When using the above-mentioned process, due to the large amount of vanadium or niobium alloy in the steel and the high cost, it squeezes out the company's resources. The profit margin is not conducive to the production and promotion of HRB500 high-strength steel bars. At the same time, the above-mentioned process has strict requirements on chemical composition and rolling temperature, and the control is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step A: get the steel billet of following mass percentage chemical composition:

[0020] C: 0.22wt%, Si: 0.45wt%, Mn: 1.30wt%, V: 0.020wt%, N: 0.011wt%, Cr: 0.27wt%, Nb: 0.015wt%, S: 0.025wt%, P: 0.035wt%, the rest is Fe and unavoidable impurities;

[0021] Step B: Put the steel slab in step A into a heating furnace with a furnace temperature of 1200°C in the soaking section, heat for 90 minutes, and make the steel start rolling temperature reach 1040°C, and go through 6 passes of rough rolling and 5 passes of intermediate rolling , finish rolling for 6 passes, and control the final rolling temperature at 950°C;

[0022] Step C: Pass the steel bar in step B through the water cooling device quickly after final rolling, so that the surface temperature drops to 450°C, which is higher than the martensite formation temperature. After that, the temperature of the steel bar on the cooling bed is 690°C, and then Allow to cool naturally.

[0023] Step D: Naturally air-cool th...

Embodiment ２

[0027] Step A: get the steel billet of following mass percent chemical composition:

[0028] C: 0.25wt%, Si: 0.50wt%, Mn: 1.35wt%, V: 0.023wt%, N: 0.013wt%, Cr: 0.30wt%, Nb: 0.015wt%, S: 0.020wt%, P: 0.025wt%, the rest is Fe and unavoidable impurities;

[0029] Step B: Send the billet of step A into a heating furnace with a furnace temperature of 1180°C in the soaking section, heat for 100 minutes, and make the steel start rolling temperature reach 1100°C, go through 6 passes of rough rolling and 4 passes of intermediate rolling , 6 passes of finishing rolling, and the temperature of finishing rolling is controlled at 980°C;

[0030] Step C: Pass the steel bars in step B through the water cooling device after final rolling, so that the surface temperature drops to 500°C, which is higher than the martensite formation temperature. After that, the temperature of the steel bars on the cooling bed is 700°C, and then Allow to cool naturally.

[0031] Step D: Naturally air-cool th...

Embodiment 3

[0034] Step A: get the steel billet of following mass percent chemical composition:

[0035] C: 0.23wt%, Si: 0.60wt%, Mn: 1.45wt%, V: 0.025wt%, N: 0.012wt%, Cr: 0.36wt%, Nb: 0.017wt%, S: 0.030wt%, P: 0.035wt%, the rest is Fe and unavoidable impurities;

[0036] Step B: Send the steel slab from Step A into a heating furnace with a furnace temperature of 1200°C in the soaking section, and heat for 80 minutes to make the rolling start temperature of the steel reach 1100°C. After 6 passes of rough rolling and 4 passes of intermediate rolling , 4 passes of finishing rolling, and the temperature of finishing rolling is controlled at 980°C;

[0037]Step C: Pass the steel bar in step B through the water cooling device quickly after final rolling, so that the surface temperature drops to 500°C, which is higher than the martensite formation temperature. After that, the temperature of the steel bar on the cooling bed is 720°C, and then Allow to cool naturally.

[0038] Step D: Natural...

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Abstract

The invention relates to a high-strength anti-seismic steel bar and a preparation method thereof. Its chemical composition in mass percentage is: C: 0.20~0.25wt%, Si: 0.40~0.65wt%, Mn: 1.30~1.50wt%, V: 0.020~0.030wt%, N: 0.010~0.020wt% , Cr: 0.25-0.40wt%, Nb: 0.010~0.020wt%, S≤0.045wt%, P≤0.045wt%, the rest is Fe and unavoidable impurities. Preparation method: Send the steel billet into the soaking section with a furnace temperature of 1150~1200°C, heat for 70~100 minutes, make the steel start rolling temperature reach 1020~1100°C, go through rough rolling, intermediate rolling, and finish rolling, and the final rolling temperature is 950 ~1000℃; rapid water cooling after final rolling, the surface temperature drops to 400~500℃, the temperature after the upper cooling bed is 680~730℃, natural cooling. It has stable mechanical properties, good elongation, weldability, low strain aging, and the pass rate of seismic resistance is over 99.2%.

Description

technical field [0001] The invention relates to a low-cost HRB500E chrome-vanadium-niobium microalloying high-strength anti-seismic steel bar and a production method thereof, which belong to the technical field of metal material processing and forming. Background technique [0002] The Ministry of Housing and Urban-Rural Development and the Ministry of Industry and Information Technology, in order to implement the relevant work arrangements in the "Notice of the State Council on Printing and Distributing the "Twelfth Five-Year Plan" Comprehensive Work Plan for Energy Conservation and Emission Reduction" (Guofa [2011] No. 26), promote the iron and steel industry and In order to change the development mode of the construction industry, in accordance with the requirements of the "Outline of the Twelfth Five-Year Plan for National Economic and Social Development", the guidance on accelerating the application of high-strength steel bars was issued in January 2012, and the applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C22C38/26C21D8/08C21D8/06
Inventor 吴光耀曹重邹荣陈伟李金柱庾郁梅王俊愉
Owner WUKUN STEEL
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