Processing method of above-600MPa-grade high-strength steel bar connection sleeve

A technology of high-strength steel bars and connecting sleeves, which is applied to building reinforcements, structural elements, building components, etc., can solve the problems of not reaching high-strength steel bar sleeves, reduce deformation and cracking, and avoid intergranular corrosion and pitting corrosion The effect of exceeding the standard and improving the tensile strength

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

[0003] So far, the connecting sleeves of 600MPa and above steel bars have not been mass-produced and sold in the market, mainly because the material of the connecting sleeves for high-strength steel bars is No. 45 steel, and its tensile strength is only 610MPa, which cannot reach The design principle of the high-strength steel sleeve is 1.1 times the strength of the sleeve, which is 830MPa; at the same time, the newly

Method used

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Examples

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Effect test

Embodiment 1

[0028] The processing method of a high-strength steel connecting sleeve provided in this embodiment includes the following specific steps:

[0029] Step (1): Use No. 45 round steel as raw material, and the chemical composition of No. 45 round steel is C: 0.38%, Cr: 1.1%, Mn: 0.75%, Mo: 0.25%, Si: 0.21%, S: 0.025%, P: 0.03%, N: 0.025%, and the balance is Fe. The above raw materials are sent to a heating furnace to be heated to 1100°C, and drawn into a steel pipe of the required size;

[0030] Step (2): The steel pipe heated in step (1) is rapidly cooled to 610°C through the online first cooling process, and then quenched with water or quenching liquid in the quenching device for 11-13 seconds, and then After being heated to 600°C and tempered in a tempering furnace, and straightened, it is then cooled to room temperature through the second cooling process. The specific cooling process is:

[0031] The first cooling process: using water cooling to water-cool the steel bar to 61...

Embodiment 2

[0038] The processing method of a high-strength steel connecting sleeve above 600MPa level provided by this embodiment includes the following specific steps:

[0039] Step (1): Use No. 45 round steel as raw material, and the chemical composition of No. 45 round steel is C: 0.43%, Cr: 0.9%, Mn: 0.85%, Mo: 0.2%, Si: 0.3%, S: 0.013%, P: 0.015%, N: 0.012%, and the balance is Fe. The above raw materials are sent to a heating furnace to be heated to 1180°C, and drawn into a steel pipe of the required size;

[0040] Step (2): The steel pipe heated in step (1) is rapidly cooled to 630°C through the online first cooling process, and then quenched with water or quenching liquid in the quenching device for 11-13 seconds, and then After being heated to 660°C and tempered in a tempering furnace, and straightened, it is then cooled to room temperature through the second cooling process. The cooling process is as follows:

[0041] The first cooling process: using water cooling to water-cool...

Embodiment 3

[0048] The processing method of a high-strength steel connecting sleeve provided in this embodiment includes the following specific steps:

[0049] Step (1): Use No. 45 round steel as raw material, the chemical composition of No. 45 round steel is: C: 0.41%, Cr: 0.8%, Mn: 1.0%, Mo: 0.15%, Si: 0.15%, S : 0.015%, P: 0.025%, N: 0.015%, and the balance is Fe. The above raw materials are sent to a heating furnace to be heated to 1150°C, and drawn into a steel pipe of the required size;

[0050] Step (2): The steel pipe heated in step (1) is rapidly cooled to 620°C through the online first cooling process, and then quenched with water or quenching liquid in the quenching device for 11-13 seconds, and then After being heated to 640°C and tempered in a tempering furnace, and straightened, it is then cooled to room temperature through the second cooling process. The cooling process is as follows:

[0051] The first cooling process: using water cooling to water-cool the steel bars to 6...

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Abstract

The invention discloses a processing method of an above-600MPa-grade high-strength steel bar connection sleeve. The sleeve selects No.45 round steel as a raw material, and the No.45 round steel comprises 0.38-0.43wt% of C, 0.8-1.1wt% of Cr, 0.75-1.0wt% of Mn, 0.15-0.25wt% of Mo, 0.15-0.3wt% of Si, below 0.035% of S, below 0.035wt% of P, below 0.035wt% of N, and the balance Fe. The designed processing method of the above-600MPa-grade high-strength steel bar connection sleeve substantially improves the tensile strength and the elongation rate, guarantees the external diameter dimension and fineness of a steel tube, and reduces the friction stress between a tap and the inner wall of the sleeve.

Description

technical field [0001] The invention relates to a processing method for a high-strength steel bar connection sleeve above 600MPa level. Background technique [0002] The “Twelfth Five-Year Plan” of the national iron and steel industry proposes to “accelerate the elimination of 335 MPa-level threaded steel bars”, “strengthen research on the seismic performance of high-strength steel bars and high-strength concrete structural members, and carry out research and development of 600 MPa-level and above threaded steel bars”. Special emphasis is placed on speeding up the research on the connection of 600MPa and above steel bars. [0003] So far, the connecting sleeves of 600MPa and above steel bars have not been mass-produced and sold in the market, mainly because the material of the connecting sleeves for high-strength steel bars is No. 45 steel, and its tensile strength is only 610MPa, which cannot reach The design principle of the high-strength steel sleeve is 1.1 times the str...

Claims

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Application Information

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IPC IPC(8): C22C38/22C21D1/18C21D1/84E04C5/18B23P15/00
Inventor 姚圣法吴海洋
Owner 江苏森林建筑新材料股份有限公司
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