Processing technology of anti-rust anti-corrosion high-strength steel grid bolts

A high-strength steel, processing technology, applied in the direction of screws, threaded fasteners, connecting components, etc., can solve problems such as easy rust corrosion, fracture or crack, and achieve low manufacturing cost, good continuity, and simple process. Effect

Inactive Publication Date: 2019-02-19
JIANGSU HUAHAI STEEL STRUCTURE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, when the bolts are in a relatively humid environment, they are prone to rust and corrosion, eventually leading to breakage or cracks, forming a potential source of accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An anti-rust and anti-corrosion high-strength steel grid bolt processing technology, comprising the following steps:

[0023] a. Semi-finished product processing, select medium-carbon alloy steel as the raw material of the bolt, and process the raw material through the mold according to the size specification of the bolt to obtain the semi-finished bolt;

[0024] b. Heat preservation and cooling, heat preservation and cooling in the bell furnace, firstly control the heat preservation temperature to 730°C, hold heat for 10 hours, after heat preservation, the cooling temperature of the furnace body is below 250°C, and the hardness is controlled to be HB100-120;

[0025] c. Surface treatment, phosphating treatment is carried out on the screw section of the bolt semi-finished product after annealing, specifically alkali washing→water washing→acid washing→water washing→phosphating→cleaning;

[0026] d. Thread forming, forming threads on the screw part through a thread rollin...

Embodiment 2

[0032] An anti-rust and anti-corrosion high-strength steel grid bolt processing technology, comprising the following steps:

[0033] a. Semi-finished product processing, select medium-carbon alloy steel as the raw material of the bolt, and process the raw material through the mold according to the size specification of the bolt to obtain the semi-finished bolt;

[0034] b. Heat preservation and cooling, heat preservation and cooling in the bell furnace, firstly control the heat preservation temperature to 740°C, heat preservation time 8h, after heat preservation, the cooling temperature of the furnace body is below 250°C, and the hardness is controlled to be HB100-120;

[0035] c. Surface treatment, phosphating treatment is carried out on the screw section of the bolt semi-finished product after annealing, specifically alkali washing→water washing→acid washing→water washing→phosphating→cleaning;

[0036] d. Thread forming, forming threads on the screw part through a thread rol...

Embodiment 3

[0042] An anti-rust and anti-corrosion high-strength steel grid bolt processing technology, comprising the following steps:

[0043] a. Semi-finished product processing, select medium-carbon alloy steel as the raw material of the bolt, and process the raw material through the mold according to the size specification of the bolt to obtain the semi-finished bolt;

[0044] b. Heat preservation and cooling. Carry out heat preservation and cooling in the bell furnace. Firstly, control the heat preservation temperature to 750°C and hold heat for 6 hours.

[0045] c. Surface treatment, phosphating treatment is carried out on the screw section of the bolt semi-finished product after annealing, specifically alkali washing→water washing→acid washing→water washing→phosphating→cleaning;

[0046] d. Thread forming, forming threads on the screw part through a thread rolling machine;

[0047] e. Quenching: quench the formed bolts in a nitrate furnace, control the quenching temperature to 86...

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PUM

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Abstract

The invention relates to a processing technology of anti-rust anti-corrosion high-strength steel grid bolts. The processing technology comprises the steps of producing semi-finished products; preserving temperature and performing cooling, wherein the temperature is 730-750 DEG C, and the duration is 6-10h; performing surface treatment, including alkali washing, water washing, acid washing, water washing, phosphorating and cleaning; performing thread forming; performing quenching; performing tempering; performing anti-corrosion pre-treatment, wherein tempered bolts are put into an electrolyte for electrolytic degreasing and then put into a pickling solution for pickling to remove oxide on the surfaces of the bolts, and then sand blasting polishing treatment and alkali corrosion treatment are carried out in sequence; and immersing the bolts after alkali corrosion treatment in anti-corrosion anti-rust oil, and maintaining the liquid temperature at 50 DEG C for immersing for 80min to formanti-rust anti-corrosion layers on the surfaces of the bolts. By improving and adjusting existing technological processes, the processing technology reduces the number of times of heating the bolts, energy consumption and the cost, can improve the strength of the bolts, and is simple in technological process, low in manufacturing cost, good in technological process continuity and high in production efficiency, and the bolts are longer in service life.

Description

technical field [0001] The invention belongs to the technical field of processing steel network frame connectors, and in particular relates to a process for processing bolts of anti-rust and anti-corrosion high-strength steel network frames. Background technique [0002] High-strength bolts are commonly used fasteners in the machinery industry. The current processing method is generally turning and forming. The strength is often difficult to guarantee. Sometimes unsafe phenomena such as U-turn and rod breakage occur during use, which is very harmful to industrial production. . Therefore, it plays an important role in the development of technology and economy to study and improve the production method of high-strength bolts to ensure the quality stability of high-strength bolts. [0003] In addition, when the bolts are in a relatively humid environment, they are prone to rust and corrosion, eventually leading to breakage or cracks, forming a potential source of accidents. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00F16B35/00
Inventor 姜志勇
Owner JIANGSU HUAHAI STEEL STRUCTURE CO LTD
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