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Antirust method for 20A steel tube for aviation

A 20A, steel pipe technology, used in furnaces, heat treatment equipment, heat treatment furnaces and other directions, can solve the problems of steel pipe corrosion pitted surface, steel pipe and medium are easily oxidized and corroded, product production yield is less than 60%, etc. Effects on quality and yield

Active Publication Date: 2014-07-16
宝武特冶航研科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, 20A steel pipes are easily corroded when in contact with air or water and other media, resulting in corrosion cracks. Therefore, 20A steel pipes must be treated with anti-rust treatment to avoid defects such as corrosion, pitting, and pits on the steel pipes.
The traditional anti-rust treatment process adopts "heat treatment + flaw detection + pickling + anti-rust" treatment steps, but there are still rust spots on the surface of the final product, which seriously affects the quality of the product and makes the final production yield of the product Less than 60%; during the transportation process, the steel pipe is easily oxidized and corroded in contact with the medium, and then when it is used for re-inspection by aviation manufacturers, its use yield is less than 50%, which causes a lot of scrap; It caused the embarrassment that the manufacturer was unwilling to produce and the manufacturer had no goods to find

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of antirust method of 20A steel pipe for aviation, comprises the following steps:

[0033] 1) Under the protection of argon, the 20A steel pipe for aviation after degreasing treatment was kept at 830°C for 4 minutes in a continuous mesh belt furnace, and then cooled rapidly;

[0034] 2) Straightening, flaw detection and removal of unqualified parts;

[0035] 3) Polish with a six-head polishing machine to remove the oxide film and surface defects on the outer surface of the steel pipe; then heat the lye to 80°C by steam heating, and keep it warm for 1.5h by electric heating; Wash in acid solution at ℃ for 5 minutes to remove the oxide film on the inner surface of the steel pipe;

[0036] Wherein the lye is composed of KMnO with a mass ratio of 5:5:90 4 , NaOH and water; the acid solution is made by mixing hydrochloric acid and water with a volume ratio of 1:10;

[0037] 4) At room temperature, neutralize the 20A steel pipe for aviation after the treatment in s...

Embodiment 2

[0043] A kind of antirust method of 20A steel pipe for aviation, comprises the following steps:

[0044] 1) Under the protection of argon, the 20A steel pipe for aviation after degreasing treatment was kept at 830°C for 5 minutes in a continuous mesh belt furnace, and then cooled rapidly;

[0045] 2) Straightening, flaw detection and removal of unqualified parts;

[0046] 3) Polish with a six-head polishing machine to remove the oxide film and surface defects on the outer surface of the steel pipe; then heat the lye to 85°C by steam heating, and keep it warm for 1.2h by electric heating; at 30°C Wash in the acid solution for 4 minutes to remove the oxide film on the inner surface of the steel pipe;

[0047] Wherein the lye is composed of KMnO with a mass ratio of 5:5:90 4 , NaOH and water; the acid solution is made by mixing hydrochloric acid and water with a volume ratio of 1:10;

[0048]4) At room temperature, neutralize the 20A steel pipe for aviation after the treatme...

Embodiment 3

[0054] A kind of antirust method of 20A steel pipe for aviation, comprises the following steps:

[0055] 1) Under the protection of argon, the 20A steel pipe for aviation after degreasing treatment was kept at 830°C for 6 minutes in a continuous mesh belt furnace, and then cooled rapidly;

[0056] 2) Straightening, flaw detection and removal of unqualified parts;

[0057] 3) Polish with a six-head polishing machine to remove the oxide film and surface defects on the outer surface of the steel pipe; then heat the lye to 90°C by steam heating, and then heat it for 1 hour by electric heating; Wash in acid solution for 4 minutes to remove the oxide film on the inner surface of the steel pipe;

[0058] Wherein the lye is composed of KMnO with a mass ratio of 5:5:90 4 , NaOH and water; the acid solution is made by mixing hydrochloric acid and water with a volume ratio of 1:10;

[0059] 4) At room temperature, neutralize the 20A steel pipe for aviation after the treatment in step ...

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PUM

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Abstract

The invention discloses an antirust method for a 20A steel tube for aviation. The method comprises steps of (1) thermal treating under argon shield; (2) straightening, flaw detecting, and cutting off unqualified parts; (3) polishing, then soda boiling and acid prickling; (4) neutralizing, washing and draining off; (5) steeping in lubricating oil, acid pickling, alkali washing, and draining off; (6) steeping in antirust oil, draining the oil, bagging and packaging. Being treated by the method, the steel tube avoids pitted surface due to local corrosion, and the yield and quality of the product are improved.

Description

technical field [0001] The invention relates to a method for preventing rust of steel materials, in particular to a method for preventing rust of 20A steel pipes for aviation. Background technique [0002] 20A steel pipe is a traditional aviation material. It is a high-quality alloy structural steel with stable comprehensive performance. It is highly valued by the majority of aviation manufacturers and has strong vitality. [0003] However, 20A steel pipes are easily corroded in contact with air or water and other media, resulting in corrosion cracks. Therefore, 20A steel pipes must be treated with anti-rust treatment to avoid corrosion, pitting, pits and other defects in the steel pipe. The traditional anti-rust treatment process adopts "heat treatment + flaw detection + pickling + anti-rust" treatment steps, but there are still rust spots on the surface of the final product, which seriously affects the quality of the product and makes the final production yield of the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C23F11/00B24B1/00
Inventor 杨军和龚奎杜昌忠
Owner 宝武特冶航研科技有限公司
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