More than 630 MPa level high strength steel bar and application method thereof in reinforced concrete

A technology of reinforced concrete and high-strength steel bars, which is used in building reinforcements, improvement of process efficiency, structural elements, etc., can solve the problem of inability to prevent quenching cracking and internal cracking of forgings, inability to meet the thickness of reinforced concrete protection, and inability to further fully dissolve carbides and other problems, to achieve the effect of being conducive to pouring and vibration, uniform mechanical properties, and not easy to bend and deform

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
[0003] In the prior art, the atomic activity of carbon and nitrogen elements in the steel raw material composition is low, and the air mass formed...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A high-strength steel bar above 630MPa level provided in this embodiment, the high-strength steel bar includes the following components in mass percentages, carbon: 0.3%, silicon: 0.18%, manganese: 0.50%, chromium: 0.90%, molybdenum: 0.20%, Phosphorus: 0%, sulfur: 0%, hydrogen: 1.0ppm, nickel: 0%, vanadium: 0%, copper: 0-0.30%, 0-0.9% residual elements, the rest is Fe;

[0036] The production process of the high-strength steel bar is:

[0037]Step (1): Using chromium-nickel-molybdenum alloy structural steel as a billet, and performing hydrogen expansion heat treatment on it, specifically including: heating the prestressed steel rod forging billet obtained in step (1) to 870°C and holding it for 360 minutes, Cool in air to 290°C for 180 minutes, then heat to 585°C for 650 minutes, cool to 340°C in the furnace and air cool;

[0038] Step (2): Put the above-mentioned steel bar after hydrogen expansion heat treatment into the heating furnace and heat it to 1350°C. After le...

Embodiment 2

[0046] This embodiment provides a high-strength steel bar above 630MPa. The high-strength steel bar includes the following components in mass percentages: carbon: 0.32%, silicon: 0.36%, manganese: 0.70%, chromium: 1.10%, molybdenum: 0.30% %, phosphorus: 0.02%, sulfur: 0.025%, hydrogen: 1.8ppm, nickel: 0.40%, vanadium: 0.03%, copper: 0.30%, 0-0.9% residual elements, the rest is Fe;

[0047] The production process of the high-strength steel bar is:

[0048] Step (1): The chromium-nickel-molybdenum alloy structural steel is used as the blank, and it is subjected to hydrogen expansion heat treatment, which specifically includes: heating the prestressed steel rod forging billet obtained in step (1) to 890°C and holding it for 360 minutes, Air-cool to 310°C and hold for 180 minutes, then heat to 615°C and hold for 650 minutes, and cool to 380°C in the furnace and air-cool;

[0049] Step (2): Put the above-mentioned steel bar after hydrogen expansion heat treatment into the heating ...

Embodiment 3

[0057] This embodiment provides a method for applying high-strength steel bars above the 630MPa level in reinforced concrete, including the following specific treatments:

[0058] Set the high-strength steel bars with a diameter of φ8mm in the reinforced concrete, and the way of distributing the high-strength steel bars in the reinforced concrete is: the high-strength steel bars are distributed along the length direction of the reinforced concrete, and there are two layers of upper and lower layers in the thickness direction of the reinforced concrete Parallel distribution, the upper layer of reinforcement and the lower layer of reinforcement are respectively composed of at least 3 high-strength steel bars distributed in parallel at equal intervals, and the interval is 160mm.

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PUM

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Abstract

The invention discloses a more than 630MPa level high strength steel bar comprising the following components: by weight, 0.28%-0.38% of carbon, 0-0.35% of silicon, 0-0.90% of manganese, 0.80%-1.50% of Cr, 3.00%-4.00% of nickel, 0.40%-0.60% of molybdenum, 0-0.015% of P, 0-0.015% of sulfur, 0-2.0ppm of hydrogen, 0.10%-0.20% of vanadium, 0-0.025% of titanium, 0-0.20% of copper, 0-0.05% of aluminum, 0-0.50% of residual elements and the balance of Fe; the invention also designs an application method of the more than 630MPa level high strength steel bar in reinforced concrete; and the more than 630MPa level high strength steel bar has the advantages of high strength, steel saving, no pollution, good hardenability, low tendency to crack and low relaxation degree.

Description

technical field [0001] The invention relates to a high-strength steel bar above 630MPa level and an application method of the 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 Hidden danger to quality. [0003] In the prior art, the atomic activity of carbon and nitrogen ...

Claims

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Application Information

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IPC IPC(8): C22C38/50C21D8/08E04C2/06E04C3/20E04C5/02
CPCY02P10/20
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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