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HRB400E twisted steel bar added with high-nitrogen reinforced alloy and production process thereof

A technology for strengthening alloy and threaded steel bars, applied in packaging and other directions, can solve the problems of bending of steel bars, insufficient precipitation strengthening effect of microalloying elements, low adjustment efficiency, etc., to improve strength, good welding performance and fatigue performance, improve performance effect

Pending Publication Date: 2021-03-30
ANYANG YONGXING IRON & STEEL CO LTD OF JIANGSUSHAGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Niobium, vanadium, titanium microalloying methods are commonly used at home and abroad to develop high-strength steel bars of 400MPa, 500MPa and above grades, and the yield strength and tensile strength of steel bars are improved through the carbonitride precipitation strengthening effect of microalloying elements. A large number of tests and production results show that : Low-nitrogen steel often does not fully exert its precipitation strengthening effect of microalloying elements. Under this background, establish the research and development of composite microalloying technology for high-strength steel bars, improve the precipitation strengthening effect of microalloying elements, save resources and reduce costs
[0003] In addition, at the end of the production process of threaded steel bars, it is necessary to cut the steel bars into sections ranging from 6 to 12 meters in length, and bundle hundreds of steel bars. Usually, a bundle is two tons. The phenomenon of direction placement, the commonly used strapping equipment is to shake the steel bars to make self-adjustment before bundling. In actual use, the adjustment efficiency is not high, and there are still a small amount of steel bars that are squeezed and bent during the bundling and stacking process. Phenomenon

Method used

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  • HRB400E twisted steel bar added with high-nitrogen reinforced alloy and production process thereof
  • HRB400E twisted steel bar added with high-nitrogen reinforced alloy and production process thereof

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Experimental program
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Effect test

Embodiment 1

[0042] The present invention provides a technical solution: the HRB400E threaded steel bar added with high nitrogen strengthening alloy of this embodiment and its production process. Rebar, in mass percentage, includes the following components: C: 0.25%, Si: 0.55%, Mn: 1.50%, Ti: 0.020%, P: 0.040%, S: 0.040%, N: 0.012%; the balance is iron and unavoidable impurities.

[0043] The production process of HRB400E rebar with high nitrogen strengthening alloy includes the following steps:

[0044] (1) Smelting, specifically including converter smelting, molten steel alloying treatment and LF refining;

[0045] The converter smelting specifically includes: Si≤0.65%, P≤0.15%, S≤0.035% in molten iron, slag content <0.5%, molten iron temperature: 1250°C, total charging capacity 157t, molten iron 85%, scrap steel 15% %, the charging amount is required to be stable, and the deviation between the front and rear furnaces is ≤±4t; during smelting, 30kg / t of lime, 19kg / t of lightly burned d...

Embodiment 2

[0058] The present invention provides a technical solution: the HRB400E threaded steel bar added with high nitrogen strengthening alloy of this embodiment and its production process. Rebar, in mass percentage, includes the following components: C: 0.22%, Si: 0.45%, Mn: 1.40%, Ti: 0.010%, P: 0.020%, S: 0.020%, N: 0.009%; the balance is iron and unavoidable impurities.

[0059] The production process of HRB400E rebar with high nitrogen strengthening alloy includes the following steps:

[0060] (1) Smelting, specifically including converter smelting, molten steel alloying treatment and LF refining;

[0061] The converter smelting is specifically as follows: Si≤0.65%, P≤0.15%, S≤0.035%, slag content<0.5% in molten iron, molten iron temperature≥1250°C, total charge 155±2t, 80% molten iron, Scrap steel 20%, the charging amount is required to be stable, and the deviation between the front and rear furnaces is ≤±4t; during smelting, add lime 26kg / t steel, light-burned dolomite 17kg / ...

Embodiment 3

[0070] The present invention provides a technical solution: the HRB400E threaded steel bar added with high nitrogen strengthening alloy of this embodiment and its production process. Rebar, in mass percentage, includes the following components: C: 0.23%, Si: 0.50%, Mn: 1.45%, Ti: 0.015%, P: 0.040%, S: 0.020%, N: 0.010%; the balance is iron and unavoidable impurities.

[0071] The production process of HRB400E rebar with high nitrogen strengthening alloy includes the following steps:

[0072] (1) Smelting, specifically including converter smelting, molten steel alloying treatment and LF refining;

[0073] The converter smelting is specifically as follows: Si≤0.65%, P≤0.15%, S≤0.035% in molten iron, slag content<0.5%, molten iron temperature≥1250°C, total charge 155±2t, molten iron 83%, Scrap steel 17%, the charging amount is required to be stable, and the deviation between the front and rear furnaces is ≤±4t; during smelting, add lime 28kg / t steel, light-burned dolomite 18kg / ...

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Abstract

The invention relates to the field of steel bar processing technologies, in particular to an HRB400E twisted steel bar added with a high-nitrogen reinforced alloy and a production process thereof. Thetwisted steel bar comprises, by mass: 0.22-0.25% of C, 0.45-0.55% of Si, 1.40-1.50% of Mn, 0.010-0.020% of Ti, less than or equal to 0.040% of P, less than or equal to 0.040% of S, 0.009-0.012% of N,and the balance Fe and inevitable impurities. In the production process, the high-nitrogen reinforced alloy is added during smelting to replace a ferrovanadium alloy, a vanadium-nitrogen alloy and the like to be used for producing hot-rolled ribbed steel bars, and precipitation strengthening of N compounds is promoted through controlled rolling. Through a composite strengthening process, the strength, toughness and ductility of steel are improved, the steel has good welding performance and fatigue performance, and the cost per ton of steel is reduced. The problems that the production cost ofthe hot-rolled ribbed steel bars is high and vanadium resources are in shortage are solved, and the requirements of market development are met.

Description

technical field [0001] The invention relates to the technical field of steel bar processing technology, in particular to a HRB400E threaded steel bar added with a high-nitrogen strengthening alloy and a production process thereof. Background technique [0002] At present, the main construction steel in developed countries such as Europe and the United States is basically 400MPa, 500MPa or even higher-strength steel bars with high strength and good comprehensive performance. Grade high-strength steel bars have not yet been promoted. The popularization and application of 400MPa and above high-strength steel bars is in line with my country's advanced concept of green development of "weight reduction, quality improvement, and energy saving", and it is also the development trend of domestic and foreign construction steel. Niobium, vanadium, titanium microalloying methods are commonly used at home and abroad to develop high-strength steel bars of 400MPa, 500MPa and above grades, ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C33/06B65B35/42B65B35/56
CPCC22C38/02C22C38/04C22C38/14C22C38/001C22C33/06B65B35/42B65B35/56Y02P10/20
Inventor 宋保民史书广邱永高冯永宾
Owner ANYANG YONGXING IRON & STEEL CO LTD OF JIANGSUSHAGANG GRP
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