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Aluminized steel fastener type scaffolding steel pipe and preparation method thereof

A technology of scaffolding and aluminized steel, which is applied in the field of scaffolding steel pipes, can solve the problems that the corrosion of scaffolding steel pipes has not been detected and prevented in time, the surface roughness of anti-rust paint is small, and the strength of scaffolding steel pipes is affected, so as to achieve excellent antirust ability and eliminate Surface brittle zone, effect of improving thermal shock resistance and thermal fatigue resistance

Inactive Publication Date: 2015-09-30
HUBEI PROVINCIAL COMM INVESTMENT FOUR ADVANTAGE STEEL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fastener-type scaffolding steel pipes in the domestic market generally use Q235 ordinary steel pipes, which have poor anti-rust ability. However, scaffolding steel pipes are exposed to air and rain for a long time, and the corrosion is very severe, which has seriously affected the strength of scaffolding steel pipes. The collapse accidents of construction scaffolding are all caused by the corrosion of scaffolding steel pipes that have not been detected and prevented in time
[0007] At present, the commonly used anti-rust method for scaffolding in the market is to straighten and spray anti-rust paint when the construction is completed every time it is disassembled and put into storage, which wastes man-hours and the cost of spraying anti-rust paint is high
In addition, because workers often use actions such as throwing and throwing when placing scaffolding steel pipes, they seldom handle them with care, so the anti-rust paint is easy to fall off in the collision and has no anti-rust effect.
At the same time, spraying anti-rust paint brings the defect of reduced anti-skid ability, and the stability of the fastener scaffolding strongly depends on the friction between the fastener and the steel pipe wall. The surface roughness of the anti-rust paint is small. In order to achieve the same stability, A larger tightening force is required, causing deformation of the steel pipe of the scaffold, which brings potential safety hazards

Method used

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  • Aluminized steel fastener type scaffolding steel pipe and preparation method thereof
  • Aluminized steel fastener type scaffolding steel pipe and preparation method thereof
  • Aluminized steel fastener type scaffolding steel pipe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 1. Cut Q235 ordinary steel pipe with a diameter of 48.3mm, a wall thickness of 3.6mm and a length of 4m;

[0074] 2. Baking and degreasing, put the workpiece in an environment of 420 ° C for 10 minutes;

[0075] 3. Pickling and rust removal, the workpiece is placed in 2.5% wt98H by mass 2 SO 4 , 16% wt36HCI aqueous solution, the time is 3min; the alternating current in the pickling tank is 40A, the power frequency is 9kHz, and the pickling time is 2min;

[0076] 4. Washing with water, place the workpiece in high-pressure water for 5 minutes;

[0077] 5. Activation, the workpiece is placed with a mass percentage of 1.8%Na 2 B 4 o 7 , 2%NaNO 2 , 30%NaOH aqueous solution, the time is 30s;

[0078] 6. To aid infiltration, the workpiece is placed with a mass percentage of 0.3%ZrF 4 , 0.12%Na 2 ZrF 6 , 0.05%ZrO 2 , 0.05%KMnO 4 In the aqueous solution, the time is 5min;

[0079] 7. Drying, the workpiece is dried in an environment of 300 ° C for 3 minutes;

[0080...

Embodiment 2

[0082] 1. Cut Q235 ordinary steel pipe with a diameter of 48.3mm, a wall thickness of 3.6mm and a length of 4m;

[0083] 2. Baking and degreasing, chemically degreasing the workpiece, and baking and degreasing treatment in the temperature range of 425°C for 10 minutes until the surface is clean and oil-free.

[0084] 3. Pickling and derusting, the workpiece after degreasing is immersed in the pickling solution, and the component of the pickling solution is wt98H with a mass percentage of 2.5% 2 SO 4 , 16% wt36HCl, and the balance is water; pickling is carried out in a sulfuric acid pool with alternating current, the current value is 40A, the power frequency is 9kHz, and the pickling time is 2min.

[0085] 4. Wash with water, wash the workpiece with high-pressure water for 2 times after derusting.

[0086] 5. The surface is activated, and the workpiece after washing is immediately immersed in 1.8% Na by mass percentage 2 B 4 o 7 , 2%NaNO 2 , 30% NaOH, and the balance is w...

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Abstract

An aluminized steel fastener type scaffold steel pipe comprises a scaffold steel pipe body. The scaffold steel pipe body is sequentially divided into a base body layer, an iron-and-aluminum alloy layer and an aluminum layer from inside to outside, the thickness of the iron-and-aluminum alloy layer is 14-29 micrometers, and the thickness of the pure aluminum layer is 15-100 micrometers. A preparation method of the aluminized steel fastener type scaffold steel pipe includes the following steps of using a common seamless or seamed steep pipe as a workpiece, drying and unoiling the workpiece, acid cleaning and removing rust, washing, activating the surface, promoting permeation, drying, and rapidly aluminizing in an induction mode. The scaffold steel pipe with the aluminized surface is acquired through the steps. The mechanical performance of the aluminized steel fastener type scaffold steel pipe can be guaranteed, the excellent corrosion resistant performance is possessed, the service life is long, and using cost of the scaffold steep pipe is reduced.

Description

technical field [0001] The invention relates to the field of scaffolding steel pipes, in particular to an aluminized steel fastener-type scaffolding steel pipe and a preparation method thereof, which are suitable for fastening-type scaffolding steel pipes for construction of buildings (buildings and mining), and are mainly used as construction aids for buildings. For example, vertical poles, horizontal poles, sweeping poles, and wall poles of fastener-type steel pipe scaffolding. Background technique [0002] Scaffolding refers to various supports erected on the construction site to facilitate the operation of workers and solve vertical and horizontal transportation. It is usually used in places where exterior walls, interior decoration, and high heights cannot be directly constructed. [0003] Common types of scaffolding include fastener type, door type, bowl buckle type, and buckle plate type. Among them, the portal scaffolding is named after the main frame in the shape o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/18
Inventor 费新成张雷韩孟岩刘凤生陈学辉刘丹
Owner HUBEI PROVINCIAL COMM INVESTMENT FOUR ADVANTAGE STEEL TECH
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