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600 MPa-grade-and-above high strength steel bars and reinforced concrete application method thereof

A technology of reinforced concrete and high-strength steel bars, applied in the field of steel bar manufacturing, can solve problems such as hidden dangers in engineering quality, low yield strength, and inability to meet the protection thickness of reinforced concrete, etc., achieve good trampling resistance, reduce diameter, and avoid excessive corrosion rate and the effect of hardness exceeding the standard

Active Publication Date: 2014-03-19
江苏森林建筑新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, steel bars for construction are used as steel for concrete structures. Most of the ordinary steel bars are HRB335 and HRB400 steel, and a small amount of HRB500 steel is used. Although the above-mentioned ordinary steel bars are widely used in house construction in my country, especially buildings (houses) Due to the low yield strength of the steel bars, the steel bars of the face plate are subjected to artificial active loads during the construction process, and the upper steel bars of the double-layer two-way steel bars are often bent and deformed, which cannot meet the structural restrictions on the protective thickness of the reinforced concrete, resulting in cracks, resulting in engineering Quality hidden danger

Method used

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  • 600 MPa-grade-and-above high strength steel bars and reinforced concrete application method thereof
  • 600 MPa-grade-and-above high strength steel bars and reinforced concrete application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high-strength steel bar of 600 MPa grade and above provided in this embodiment, the weight percentage composition of the high-strength steel bar is: C: 0.2%, Mn: 0.45%, Si: 0.62%, Cr: 0.7%, Mo: 0.15%, Ni: 0.65%, V: 0.3%, S: 0.0075%, P: <0.01%, the balance is Fe and unavoidable impurities.

[0035] The production process of the high-strength steel bar is:

[0036] (1) Put the steel bar in the heating furnace and heat it to 1300°C. After leaving the heating furnace, use water cooling to cool the steel bar to 950°C at a cooling rate of 23°C / s, then quench it with water or quenching liquid in the quenching device, and then temper it Heating in the heating furnace to 600°C for tempering, and then cooling to room temperature through the first cooling process; the first cooling process is: using water cooling and air cooling, first using water cooling at a cooling rate of 1.5°C / s to water-cool the steel bar to 460 °C, then air-cooled to 290 °C, then water-cooled to 200 °C a...

Embodiment 2

[0042] A high-strength steel bar of 600 MPa grade and above provided in this embodiment, the weight percentage composition of the high-strength steel bar is: C: 0.15%, Mn: 0.4%, Si: 0.75%, Cr: 0.6%, Mo: 0.2%, Ni: 0.5%, V: 0.25%, S: 0.009%, P: 0.009%, the balance is Fe and unavoidable impurities.

[0043] The production process of the high-strength steel bar is:

[0044] (1) Put the steel bar in the heating furnace and heat it to 1350°C. After leaving the heating furnace, use water cooling to cool the steel bar to 920°C at a cooling rate of 24°C / s, then quench it with water or quenching liquid in the quenching device, and then temper it Heating in the heating furnace to 600°C for tempering, and then cooling to room temperature through the first cooling process; the first cooling process is: use water cooling and air cooling, first use water cooling to cool the steel bar to 430°C at a cooling rate of 3°C / s °C, then air-cooled to 320 °C, and then water-cooled to 180 °C at a cool...

Embodiment 3

[0050] A high-strength steel bar of 600 MPa grade and above provided in this embodiment, the weight percentage composition of the high-strength steel bar is: C: 0.18%, Mn: 0.65%, Si: 0.69%, Cr: 0.65%, Mo: 0.3%, Ni: 0.59%, V: 0.4%, S: 0.008%, P: 0.011%, and the balance is Fe and unavoidable impurities.

[0051] The production process of the high-strength steel bar is:

[0052] (1) Put the steel bar in the heating furnace and heat it to 1400°C. After leaving the heating furnace, use water cooling to cool the steel bar to 940°C at a cooling rate of 25°C / s, then quench it with water or quenching liquid in the quenching device, and then temper it Heat to 610°C in the heating furnace for tempering, and then cool to room temperature through the first cooling process; the first cooling process is: use water cooling and air cooling, first use water cooling to cool the steel bar to 420°C at a cooling rate of 2.5°C / s °C, then air-cooled to 300 °C, then water-cooled to 190 °C at a coolin...

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Abstract

The present invention discloses 600 MPa-grade-and-above high strength steel bars and a reinforced concrete application method thereof. According to the present invention, 0.4-0.65% by weight of Mn, 0.6-0.7% by weight of Cr, 0.15-0.3% by weight of Mo, 0.5-0.65% by weight of Ni, and 0.25-0.4% by weight of V are added to the steel bar component so as to improve strength, toughness, corrosion resistance, wear resistance and impact resistance of the steel bar, make the steel bar be compact, improve hardenability of the steel, and improve atom activities of the elements such as C and N, such that deformation and cracking can be reduced; and the application method of the diameter 6 mm and diameter 22 mm 600 MPa-grade-and-above high strength steel bars in the reinforced concrete has advantages of steel bar consumption reduction, carrying capacity increase, and crack extension resistance.

Description

technical field [0001] The invention relates to a manufacturing method and an application method of a steel bar, in particular to a high-strength steel bar of 600 MPa level and above and an application method thereof for reinforced concrete. Background technique [0002] At present, steel bars for construction are used as steel for concrete structures. Most of the ordinary steel bars are HRB335 and HRB400 steel, and a small amount of HRB500 steel is used. Although the above-mentioned ordinary steel bars are widely used in house construction in my country, especially buildings (houses) Due to the low yield strength of the steel bars, the steel bars of the face plate are subjected to artificial active loads during the construction process, and the upper steel bars of the double-layer two-way steel bars are often bent and deformed, which cannot meet the structural restrictions on the protective thickness of the reinforced concrete, resulting in cracks, resulting in engineering Hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C21D8/08E04C2/06E04C3/20
Inventor 吴海洋姚圣法
Owner 江苏森林建筑新材料股份有限公司
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