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

A production method and corrosion-resistant technology, applied in the field of metallurgy, can solve problems such as difficulty in realization and increase in production costs, and achieve the effect of good mechanical properties and corrosion resistance, and low content of precious alloy elements

Active Publication Date: 2020-11-06
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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  • A kind of ultra-high-strength corrosion-resistant steel bar and its production method
  • A kind of ultra-high-strength corrosion-resistant steel bar and its production method
  • A kind of ultra-high-strength corrosion-resistant steel bar and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The diameter of the ultra-high-strength corrosion-resistant steel bar in this embodiment is 41 mm, and its chemical composition and mass percentage are shown in Table 1.

[0038] The production method of the ultra-high-strength corrosion-resistant steel bar in this embodiment includes the steps of casting slab heating, casting slab rolling and heat preservation after rolling, and the specific process steps are as follows:

[0039] (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;

[0040] (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;

[0041] (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 dr...

Embodiment 2

[0044] The diameter of the ultra-high-strength corrosion-resistant steel bar in this example is 50mm, and its chemical composition and mass percentage are shown in Table 1.

[0045] The production method of the ultra-high-strength corrosion-resistant steel bar in this embodiment includes the steps of casting slab heating, casting slab rolling and heat preservation after rolling, and the specific process steps are as follows:

[0046] (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;

[0047] (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;

[0048] (3) Heat preservation process after rolling: After rolling, the upper cooling bed is air-cooled, and when the temperature drops to 670°C, cover the heat preservation cover, the heat preservation time is 10 minutes, and t...

Embodiment 3

[0051]The diameter of the ultra-high-strength corrosion-resistant steel bar in this example is 32 mm, and its chemical composition and mass percentage are shown in Table 1.

[0052] The production method of the ultra-high-strength corrosion-resistant steel bar in this embodiment includes the steps of casting slab heating, casting slab rolling and heat preservation after rolling, and the specific process steps are as follows:

[0053] (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;

[0054] (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;

[0055] (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 dr...

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Abstract

The invention discloses an ultrahigh-strength corrosion-resistant rebar and a producing method thereof. The ultrahigh-strength corrosion-resistant rebar is prepared from, by mass percent, 0.21% to 0.27% of C, 0.50% to 0.80% of Si, 1.10% to 1.30% of Mn, 0.06% to 0.20% of V, 0.01% to 0.02% of Nb, 0.010% to 0.017% of N, 0.02% to 0.10% of Als, 0.01% to 0.07% of Ce, 0.20% to 0.43% of Cr, 0.20% to 0.45%of Cu, and / or 0.10% to 0.70% of Mo and the balance Fe and inevitable impurities. The producing method comprises the procedures of casting blank heating, casting blank rolling and after-rolling heat preservation. According to the ingredient design of the ultrahigh-strength corrosion-resistant rebar, low-content valuable alloy elements are adopted, the rolled rebar is covered with a heat preservation cover during cooling, and the obtained product has the beneficial effects of being good in mechanical property and corrosion resisting property and low in valuable alloy element content.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an ultrahigh-strength corrosion-resistant 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. Since high-strength steel bars are generally used in important buildings or equipment, and have a long service life, the steel bars must also have certain corrosion resistance. [0003] The increase in the strength of traditional steel bars is generally achieved ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C21D8/08
CPCC21D8/065C21D8/08C22C38/001C22C38/005C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26
Inventor 张贺佳孔超王全利王雷王金星王欣
Owner HEBEI IRON AND STEEL
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