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A kind of niobium microalloyed hrb400e steel bar and its preparation method

A technology of microalloying and deoxidation alloying, which is applied in the field of preparation of niobium microalloyed HRB400E steel bars, can solve the problems of material performance degradation, corrosion resistance, poor welding performance and wear resistance, etc., so as to improve corrosion resistance and increase Corrosion resistance, toughness and plasticity improvement effect

Active Publication Date: 2020-08-25
福建三宝钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfur and oxygen, as impurity elements, often exist in carbon steel in the form of non-metallic compounds (such as FeS, FeO), forming non-metallic inclusions, which leads to the deterioration of material properties, especially the existence of S often causes the thermal deformation of materials. brittleness
[0006] Chinese patent application CN110029281A discloses a niobium microalloyed fine-grained HRB400 steel bar and its preparation method, including the following chemical components in mass percentage: C 0.22-0.25%, Si 0.40-0.50%, Mn 1.35-1.45%, Nb 0.025-0.035%, the balance is Fe and unavoidable impurities, and the provided niobium microalloyed fine-grained HRB400 steel bar has a certain tensile strength, but its corrosion resistance, welding performance and wear resistance are poor

Method used

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  • A kind of niobium microalloyed hrb400e steel bar and its preparation method
  • A kind of niobium microalloyed hrb400e steel bar and its preparation method

Examples

Experimental program
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Embodiment 1

[0034] Prepare raw materials according to the ratio of each component in the HRB400E steel bar. In this example, the ratio of each component in the HRB400E steel bar is: C 0.2%, Si 0.3%, Mn 0.7%, Nb 0.045%, Cr 0.012%, As 0.008% , Ti0.012%, V 0.03%, W 0.01%, Hf 0.015%, and the rest is Fe;

[0035] The preparation method of niobium microalloyed HRB400E steel bar comprises the following steps:

[0036] (1) Smelting: after desulfurization treatment of steel scrap and arsenite ore, the sulfur content in molten iron produced is ≤0.001%; ​​it is added to the converter for oxygen blowing smelting;

[0037] (2) Add the mixture of reducing chromium pellets and reducing manganese pellets during oxygen blowing smelting in converter for 8 minutes;

[0038](3) Measure temperature, take samples, and determine the supplementary blowing time; before tapping, add the calculated alloy into the ladle, add ferrosilicon for deoxidation alloying; perform deoxidation alloying, and add medium carbon ...

Embodiment 2

[0042] Prepare raw materials according to the ratio of each component in the HRB400E steel bar. In this example, the ratio of each component in the HRB400E steel bar is: C 0.15%, Si 0.35%, Mn 0.50%, Nb 0.055%, Cr 0.01%, As 0.01% , Ti0.015%, V 0.02%, W 0.02%, Hf 0.005%, and the rest is Fe;

[0043] The preparation method of niobium microalloyed HRB400E steel bar comprises the following steps:

[0044] (1) Smelting: after desulfurization treatment of scrap steel, pig iron block and arsenite ore, the sulfur content in molten iron produced is ≤0.001%; ​​it is added to the converter for oxygen blowing smelting;

[0045] (2) Add the mixture of reducing chromium pellets and reducing manganese pellets during oxygen blowing smelting in converter for 10 minutes;

[0046] (3) Measure temperature, take samples, and determine the supplementary blowing time; before tapping, add the calculated alloy into the ladle, add ferrosilicon and anthracite for deoxidation alloying; Medium-carbon fer...

Embodiment 3

[0050] Prepare raw materials according to the ratio of each component in the HRB400E steel bar. In this example, the ratio of each component in the HRB400E steel bar is: C 0.25%, Si 0.25%, Mn 1.15%, Nb 0.037%, Cr 0.02%, As 0.005% , Ti0.01%, V 0.035%, W 0.01%, Hf 0.02%, and the rest is Fe;

[0051] The preparation method of niobium microalloyed HRB400E steel bar comprises the following steps:

[0052] (1) Smelting: after desulfurization treatment of steel scrap and arsenite ore, the sulfur content in molten iron produced is ≤0.001%; ​​it is added to the converter for oxygen blowing smelting;

[0053] (2) Add the mixture of reducing chromium pellets and reducing manganese pellets during oxygen blowing smelting in converter for 5 minutes;

[0054] (3) Measure temperature, take samples, and determine the supplementary blowing time; before tapping, add the calculated alloy into the ladle, add silicomanganese for deoxidation alloying; Fine-tune the composition of anthracite; then ...

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Abstract

The invention belongs to the field of steel making and steel rolling and particularly relates to a Nb-microalloying HRB400E rebar and a preparation method thereof. The Nb-microalloying HRB400E rebar comprises the following components: 0.15 to 0.25 percent of C, 0.25 to 0.35 percent of Si, 0.50 to 1.15 percent of Mn, 0.037 to 0.055 percent of Nb, 0.01 to 0.02 percent of Cr, 0.005 to 0.01 percent ofAs, 0.01 to 0.015 percent of Ti, 0.02 to 0.035 percent of V, 0.01 to 0.02 percent of Hf, Fe, and the like, and the prepared rebar has relatively good strength and properties such as abrasive resistance, corrosion resistance, easy welding and the like.

Description

technical field [0001] The invention belongs to the field of steelmaking, and in particular relates to a method for preparing niobium microalloyed HRB400E steel bars. Background technique [0002] Reinforcement refers to steel for reinforced concrete and prestressed reinforced concrete, which is circular in cross-section and sometimes square with rounded corners. Steel bars can withstand tension and increase mechanical strength. They are the main materials in reinforced concrete structures. Whether the performance of steel bars is qualified is directly related to the safety of construction engineering structures. Steel bars are widely used as building structural materials in the world. The use of steel bars has a large amount and a wide range, and the consumption of steel bars is still increasing year by year. In European and American countries, HRB335 steel bars have been eliminated from the national standards for construction steel, and steel bars above HRB400 are used f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/28C21D8/08C22C33/04
CPCC21D8/065C21D8/08C22C33/04C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/28
Inventor 吕维纯陈贵和吴长锡林致明林军
Owner 福建三宝钢铁有限公司