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A Processing Technology of Steel Structural Parts with Reducing Cross-section

A technology for steel structure parts and processing technology, applied in the field of steel structure processing, can solve the problems of increasing workload, cost, difficulty in appearance, and difficulty in ensuring quality with "cross" welds, etc., to increase service life. , The effect of improving the comprehensive mechanical energy and increasing the strength

Active Publication Date: 2017-08-08
JIANGSU BOLI NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only increases the workload and cost, but at the same time it is difficult to guarantee the quality of the "ten" weld seam, and the appearance is difficult to meet the requirements

Method used

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  • A Processing Technology of Steel Structural Parts with Reducing Cross-section

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a processing technology for a steel structure with a reduced cross-section, including the following steps:

[0035] (1) Draw the blanking pattern on the steel plate according to the proportion according to the drawing, and use the gas cutting method to blank the wing plate and web as a whole;

[0036] (2) Flame heating process is used for the wing plate, heated to 980°C, and the holding time is according to To determine, where H is the thickness of the steel, n is the empirical coefficient, the value is 0.26, λ is the thermal conductivity of the material at the corresponding temperature, T is the heating temperature; the wing plate is simmered and bent under the action of heat simmering technology and external force , the bending angle is determined according to the design requirements;

[0037] (3) The bent steel structure is quenched in water, cooled to 480°C, and then cooled to room temperature at a cooling rate of 6°C / s in mineral oil;

...

Embodiment 2

[0042] This embodiment provides a processing technology for a steel structure with a reduced cross-section, including the following steps:

[0043] (1) Draw the blanking pattern on the steel plate according to the proportion according to the drawing, and use the gas cutting method to blank the wing plate and web as a whole;

[0044] (2) The wing plate is heated to 1000°C by flame heating process, and the holding time is according to To determine, where H is the thickness of the steel, n is the empirical coefficient, the value is 0.30, λ is the thermal conductivity of the material at the corresponding temperature, T is the heating temperature; the wing plate is simmered and bent under the action of heat simmering technology and external force , the bending angle is determined according to the design requirements;

[0045] (3) The bent steel structure is quenched in water, cooled to 520°C, and then cooled to room temperature at a cooling rate of 8°C / s in mineral oil;

[0046]...

Embodiment 3

[0050] This embodiment provides a processing technology for a steel structure with a reduced cross-section, including the following steps:

[0051] (1) Draw the blanking pattern on the steel plate according to the proportion according to the drawing, and use the gas cutting method to blank the wing plate and web as a whole;

[0052] (2) The wing plate is heated to 1080°C by flame heating process, and the holding time is according to To determine, where H is the thickness of the steel, n is the empirical coefficient, the value is 0.34, λ is the thermal conductivity of the material at the corresponding temperature, T is the heating temperature; the wing plate is simmered and bent under the action of heat simmering technology and external force , the bending angle is determined according to the design requirements;

[0053] (3) The steel structure after simmering is quenched in water, cooled to 560°C, and then cooled to room temperature at a cooling rate of 10°C / s in mineral oi...

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Abstract

The invention discloses a machining process of a section variable diameter steel structural part. A wing plate and a web plate are entirely blanked; the diameter change of the web plate adopts a gas cutting process; the web plate is cut according to the drawing requirements; the wing plate adopts a flame heating process; and the wing plate is bent by a fire bending process under the effect of external force. After the quenching treatment and tempering treatment procedures are finished, the machining process performs a quenched-tempered heat treatment procedure for a steel material to guarantee uniform distribution of a silicon element and a boron element of the steel material in the fire bending place of the steel material, so that the strength of the steel material is improved; through detections, along with the rise of the tempering temperature, ferrites lengthened in the fire bending direction have a growing tendency, the number of granular ferrites is decreased, the sizes are nonuniformly increased, and the grain sizes are increased; and the average values of the tensile strength and the yield strength are increased along with the rise of the tempering temperature, and the yield ratio is correspondingly increased, so that the steel structural part can keep enough strength after the fire bending, and the safety performance of the whole steel structural part is not influenced.

Description

technical field [0001] The invention belongs to the technical field of steel structure processing, and relates to a processing technology of steel structure parts with variable cross-sections. Background technique [0002] With the increasing maturity of steel structure technology, in order to save costs while ensuring the design requirements, or under special circumstances, many components will adopt the method of section diameter reduction to connect with other components, such as steel columns, steel beams, etc. In the design, the most commonly used method is to separate the blanking, assembly and welding of the flange and web of the steel column and steel beam at the variable diameter. This has not only increased the workload and cost, but at the same time it is difficult to ensure the quality of the "ten" weld seam, and the appearance is difficult to meet the requirements. Contents of the invention [0003] The technical problem to be solved by the present invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/54
Inventor 王小妹
Owner JIANGSU BOLI NEW ENERGY