Method for manufacturing corrosion-resistant and high-strength building scaffold steel pipe

A manufacturing method and high-strength technology, applied in the field of steel pipe manufacturing, can solve the problems of decreased mechanical strength, breakage and scrap, corrosion, etc., and achieve the effects of improving mechanical strength, saving materials, and reducing labor intensity

Inactive Publication Date: 2015-06-17
无锡正大轴承机械制造股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working environment of scaffolding is harsh. It not only has to bear acid and alkali chemical corrosion such as rain, snow, air and cement, but also bears various mechanical damages during assembly, disassembly and transportation. Decrease in strength until it breaks and is scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment one: a kind of manufacturing method of scaffolding steel pipe for building, comprises following processing step:

[0016] (1) Mechanically derust the surface of the low-carbon steel welded pipe (thickness 1.8mm), and degrease and clean the low-carbon steel welded pipe after mechanical derusting;

[0017] (2) Place the welded pipe obtained in step (1) in a molten salt tank for nitrocarburizing treatment, the temperature of nitrocarburizing is 570°C, and the time of nitrocarburizing for each welded pipe is 3 hours, and the molten salt tank The molten salt composition in is: K 2 cd 3 、Na 2 CO 3 , (NH 2 ) 2 co, LiCo 3 , K 2 cd 3 、Na 2 CO 3 , (NH 2 ) 2 co, LiCo 3 The mass ratio is 30:10:20:3;

[0018] (3) After the nitrocarburizing, the welded pipe is taken out from the molten salt tank, and then put into the oxidation tank for surface oxidation. The oxidation temperature is 380°C, and the oxidation time is 20 minutes. The molten salt composition in ...

Embodiment 2

[0024] Embodiment two: a kind of manufacturing method of scaffolding steel pipe for building, comprises following process step:

[0025] (1) Mechanically derust the surface of the low-carbon steel welded pipe (thickness 1.8mm), and degrease and clean the low-carbon steel welded pipe after mechanical derusting;

[0026] (2) Place the welded pipe obtained in step (1) in a molten salt tank for nitrocarburizing treatment. The temperature of nitrocarburizing is 620°C, and the time of nitrocarburizing for each welded pipe is 2 hours. The molten salt composition in is: K 2 cd 3 、Na 2 CO 3 , (NH 2 ) 2 co, LiCo 3 , K 2 cd 3 、Na 2 CO 3 , (NH 2 ) 2 co, LiCo 3 The mass ratio is 40:25:40:7;

[0027] (3) After the nitrocarburizing, the welded pipe is taken out from the molten salt tank, and then put into the oxidation tank for surface oxidation. The oxidation temperature is 400°C, and the oxidation time is 15 minutes. The molten salt composition in the oxidation tank is: Na ...

Embodiment 3

[0033] Embodiment three: a kind of manufacturing method of scaffolding steel pipe for building, comprises following process step:

[0034] (1) Mechanically derust the surface of the low-carbon steel welded pipe (thickness 1.8mm), and degrease and clean the low-carbon steel welded pipe after mechanical derusting;

[0035] (2) Place the welded pipe obtained in step (1) in a molten salt tank for nitrocarburizing treatment. The temperature of nitrocarburizing is 600°C, and the time of nitrocarburizing for each welded pipe is 2.5 hours. The molten salt composition in is: K 2 cd 3 、Na 2 CO 3 , (NH 2 ) 2 co, LiCo 3 , K 2 cd 3 、Na 2 CO 3 , (NH 2 ) 2 co, LiCo 3 The mass ratio is 35:18:30:5;

[0036] (3) After the nitrocarburizing, the welded pipe is taken out of the molten salt tank, and then put into the oxidation tank for surface oxidation. The oxidation temperature is 390 ° C, and the oxidation time is 18 minutes. The molten salt composition in the oxidation tank is: ...

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PUM

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Abstract

The invention relates to the field of steel pipe manufacturing technology, and particularly relates to a method for manufacturing a corrosion-resistant and high-strength building scaffold steel pipe. The method comprises the following steps: (1) carrying out mechanical surface derusting on a low carbon steel welded pipe, and deoiling and cleaning the mechanically derusted low carbon steel welded pipe; (2) nitrocarburizing the welded pipe obtained in the step (1) in a molten salt bath, wherein the nitrocarburizing temperature is 570-620 DEG C, and the nitrocarburizing time of each welded pipe is 2-3 hours; (3) taking out the welded pipe from the molten salt bath after the nitrocarburizing treatment, putting the welded pipe in an oxidation tank for oxidizing the surface, wherein the oxidation temperature is 380-400 DEG C, and the oxidation time is 15-20 minutes; (4) carrying out air cooling or water cooling on the welded pipe; and (5) cleaning salt marsh on the surface layer of the welded pipe after cooling treatment, and then drying and oiling the welded pipe. The thickness of the steel pipe obtained by the method provided by the invention can be halved, so that materials are saved and the labor intensity during disassembly and assembly is reduced.

Description

technical field [0001] The invention relates to the technical field of steel pipe manufacturing, in particular to a method for manufacturing scaffold steel pipes for construction. Background technique [0002] At present, the specifications of scaffolding steel pipes used in the construction industry are mostly low-carbon steel welded pipes with a diameter of 25.4mm and a wall thickness of 2.8mm, and the surface is coated with anti-rust paint. The working environment of scaffolding is harsh. It not only has to bear acid and alkali chemical corrosion such as rain, snow, air and cement, but also bears various mechanical damages during assembly, disassembly and transportation. The strength drops until it breaks and is scrapped. Contents of the invention [0003] In view of the above problems, the present invention provides a method for manufacturing steel pipes for construction scaffolding. The steel pipes manufactured by the method can reduce the weight of the steel pipes, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/56C23C22/62
Inventor 高子华
Owner 无锡正大轴承机械制造股份有限公司
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