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

A production method and ultra-high-strength technology, applied in the field of metallurgy, can solve the problems of increasing production costs and difficult to achieve, and achieve the effect of less content and good mechanical properties

Active Publication Date: 2020-12-22
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the strength of the steel bar, when the yield strength of the steel bar exceeds 500MPa, it is difficult to continue to rely on simple carburization, and it must be achieved by adding other alloying elements, which will inevitably increase the production cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The diameter of the ultra-high-strength steel bar in this embodiment is 41 mm, and its chemical composition and mass percentage are shown in Table 1.

[0027] The production method of the ultra-high-strength steel bar in this embodiment includes the steps of heating the slab, rolling the slab and heat preservation after rolling, and the specific process steps are as follows:

[0028] (1) Billet heating process: molten steel is smelted and continuously cast to obtain a continuous casting billet, and the billet heating temperature is 1090°C;

[0029] (2) Billet rolling process: the starting rolling temperature is 1050°C, the final rolling temperature is 950°C, and the rolling compression ratio is 8;

[0030] (3) Heat preservation process after rolling: air cooling on the upper cooling bed after rolling, cover with heat preservation cover when the temperature drops to 670°C, heat preservation time is 20min, and temperature drop rate is 12°C / min.

[0031] The mechanical pe...

Embodiment 2

[0033] The diameter of the ultra-high-strength steel bar in this embodiment is 50 mm, and its chemical composition and mass percentage are shown in Table 1.

[0034] The production method of the ultra-high-strength steel bar in this embodiment includes the steps of heating the slab, rolling the slab and heat preservation after rolling, and the specific process steps are as follows:

[0035] (1) Billet heating process: the molten steel is smelted and continuously cast to obtain a continuous casting billet, and the billet heating temperature is 1060°C;

[0036] (2) Billet rolling process: the starting rolling temperature is 1020°C, the final rolling temperature is 930°C, and the rolling compression ratio is 6;

[0037] (3) Heat preservation process after rolling: air cooling on the upper cooling bed after rolling, cover with heat preservation cover when the temperature drops to 675°C, heat preservation time 10min, temperature drop rate 10°C / min.

[0038] The mechanical performa...

Embodiment 3

[0040] The diameter of the ultra-high-strength steel bar in this embodiment is 32 mm, and its chemical composition and mass percentage are shown in Table 1.

[0041] The production method of the ultra-high-strength steel bar in this embodiment includes the steps of heating the slab, rolling the slab and heat preservation after rolling, and the specific process steps are as follows:

[0042] (1) Billet heating process: the molten steel is smelted and continuously cast to obtain a continuous casting billet, and the billet heating temperature is 1120°C;

[0043] (2) Billet rolling process: the starting rolling temperature is 1080°C, the final rolling temperature is 960°C, and the rolling compression ratio is 7;

[0044] (3) Heat preservation process after rolling: air cooling on the upper cooling bed after rolling, cover with heat preservation cover when the temperature drops to 680°C, heat preservation time is 25min, and temperature drop rate is 18°C / min.

[0045] The mechanica...

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Abstract

The invention discloses an ultrahigh-strength reinforcing bar and a production method thereof. The ultrahigh-strength reinforcing bar is prepared from the chemical compositions in percentage content by mass: 0.21-0.31% of C, 0.50-0.80% of Si, 1.40-1.60% of Mn, 0.06-0.27% of V, 0.01-0.20% of Nb, 0.010-0.017% of N, 0.02-0.10% of Als and the balance of Fe and unavoidable impurities. The production method comprises the procedures of steel slab heating, steel slab rolling and heat preservation after rolling. According to the ultrahigh-strength reinforcing bar and the production method thereof, thecomponent design of the ultrahigh-strength reinforcing bar adopts low content of precious alloy elements, the reinforcing bar after rolling is additionally covered with a heat preservation cover during cooling, the temperature dropping speed is decelerated, sufficient precipitation of V(C / N) is facilitated, and the obtained ultrahigh-strength reinforcing bar has the advantages that the mechanicalproperties are good, the content of the precious alloy elements is low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an ultrahigh-strength steel bar and a production method thereof. Background technique [0002] Compared with ordinary steel bars, high-strength steel bars can save a lot of steel, thereby reducing the weight of buildings and equipment. The reduction in the weight of the building is conducive to the improvement of the life of the pressure-bearing parts of the building and the construction of more complex and huge buildings. In addition, with the increasing requirements for energy saving and emission reduction, high-strength and high-performance steel bars have attracted much attention. [0003] The increase in the strength of traditional steel bars is generally achieved by adding carbon. However, in order to ensure the performance of the steel bar, especially the welding performance, the national standard has certain requirements on the carbon equivalent of the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/08
CPCC21D8/08C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 张贺佳王金星孔超王全利王雷耿立唐
Owner HEBEI IRON AND STEEL
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