Processing method for chrome molybdenum low alloy prestressed steel reinforcement connection joint

A technology of prestressed steel bars and chromium-molybdenum low alloys, which is applied in the processing of building materials, construction, and building construction, can solve the problems of high cost of high-strength mortar, delayed cracking, and increased reinforcement of steel bars, etc., to achieve Uniform and consistent mechanical properties, reducing deformation and cracking, and improving toughness

Inactive Publication Date: 2015-02-25
TIANSHUN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]Due to the limitations of my country's national conditions and special geological and seismic zone conditions, the introduced joint technology often cannot meet the requirements of my country's concrete structure codes, which is manifested in the high The cost of strength mortar is too high, the quality of construction welding is uneven, and the amount of steel reinforcement is often increased in consideration of earthquake conditions; , due to the brittle fracture of the prestressed steel bars, the sudden toppling of the column caused a major safety accident
[0004]At the same time, the atomic activity of carbon and nitrogen elements in the steel raw material composition is low, and the air mass formed by each atom cannot form a strong interaction with the dislocation, and there is no need to provide a relatively Large stress can start dislocation, so that the performance is very unstable. At the same time, the hydrogen content in the joint of the steel bar is above 2.0ppm, and the joint of the steel bar is prone to cracks, which will induce hydrogen-induced cracks and hydrogen-induced delayed cracks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a method for processing a chromium-molybdenum low-alloy prestressed steel bar connection node. The raw material of the steel bar connection node is No. 45 round steel, and the chemical composition of the round steel is:

[0032] Carbon: 0.30%, Silicon: 0.30%, Manganese: 0.50%, Chromium: 0.90%, Nickel: 3.50%, Molybdenum: 0.50%, Phosphorus: 0.010%, Sulfur: 0.010%, Hydrogen: 2.0ppm, Vanadium: 0.15%, Titanium: 0.020%, copper: 0.10%, aluminum: 0.02%, 0.50% residual elements, rare earth: 0.13%, the rest is Fe;

[0033] The rare earth contains the following components by weight percentage: Eu: 5.3%, Pr: 12.46%, Dy: 3.9%, Ac: 7.6%, Nd: 5.8%, Sm: 11.6%, Ce: 15.4%, Lu: 14%, the balance is La;

[0034] The invention uses chromium-nickel-molybdenum low-alloy structural steel as a blank, which can improve the toughness, elasticity, wear resistance and impact resistance of the steel, and make the steel compact, and the vanadium in the steel is very stable an...

Embodiment 2

[0046] This embodiment provides a kind of processing method of chromium-molybdenum low-alloy prestressed steel bar connection node, the raw material of this steel bar connection node is No. 45 round steel, and the chemical composition of the weight percentage of described round steel is:

[0047] Carbon: 0.35%, Silicon: 0.30%, Manganese: 0.60%, Chromium: 1.20%, Nickel: 3.60%, Molybdenum: 0.50%, Phosphorus: 0.012%, Sulfur: 0.012%, Hydrogen: 2.0ppm, Vanadium: 0.15%, Titanium: 0.022%, copper: 0.10%, aluminum: 0.03%, 0.40% residual elements, rare earth: 0.11%, the rest is Fe;

[0048] The rare earth contains the following components by weight percentage: Eu: 5.4%, Pr: 12.5%, Dy: 3.8%, Ac: 7.7%, Nd: 5.9%, Sm: 11.6%, Ce: 15.34%, Lu: 14%, the balance is La;

[0049] The invention uses chromium-nickel-molybdenum low-alloy structural steel as a blank, which can improve the toughness, elasticity, wear resistance and impact resistance of the steel, and make the steel compact, and the va...

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Abstract

The invention discloses a processing method for a chrome molybdenum low alloy prestressed steel reinforcement connection joint. Chrome-nickel-molybdenum low alloy structural steel serves as a blank, the percentage by weight of nickel is controlled to range from 3.00% to 4.00%, and the percentage by weight of chrome is controlled to range from 0.80% to 1.50%; through hydrogen diffusion heat treatment, under the premise that the hydrogen content of the blank is lower than 2.0 ppm, the hydrogen content is further reduced, the situation that white point cracks of the blank and heat treatment stress induce hydrogen induced cracks and hydrogen induced delay cracks is avoided, the toughness, elasticity, abrasive resistance and impact resistance of the steel are improved, and the steel is compact. Through the processing method for the chrome molybdenum low alloy prestressed steel reinforcement connection joint, the strength, toughness and tension stress of the steel reinforcement connection joint can be greatly improved, the corrosion resistance of the steel reinforcement connection joint can be enhanced, and the service life of the steel reinforcement connection joint can be prolonged.

Description

Technical field [0001] The present invention involves a processing method of a chromium -molybdenum low alloy prestressed reinforced steel connection node. Background technique [0002] At present, in the construction of houses at home and abroad, a building overall prefabricated component is widely used. It has achieved rapid development of the advantages of time, labor, and provincial costs.Fang relied on the introduction of nodes and construction technology of Australia, the United States and Europe, and successfully applied to the construction of prefabricated houses. For example, the nodes of Australian assembly components use reserved holes -reinforcement embedding -welding -high -intensity closed mortar technologyMeet the seismic requirements of the column nodes on the upper and lower layers of the house. [0003] Due to the restrictions on the national conditions and special geological and seismic belts in our country, the introduction of node technology introduced often ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G21/00C22C38/50C22C38/46C21D1/18
Inventor 姚圣法吴海洋
Owner TIANSHUN GROUP
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