Non-oxidizing normalizing process of steel pipe and device

A non-oxidizing, steel pipe technology, used in manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of inability to obtain F+P structure, difficult to rapidly cool steel pipes, etc., to improve the timely delivery rate, improve efficiency, and reduce costs. Effect

Inactive Publication Date: 2019-06-25
ZHEJIANG MINGHE STEEL PIPE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The normalizing equipment disclosed in this patent is difficult to quickly cool the steel pipe, and cannot obtain the required F+P structure

Method used

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  • Non-oxidizing normalizing process of steel pipe and device
  • Non-oxidizing normalizing process of steel pipe and device
  • Non-oxidizing normalizing process of steel pipe and device

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0040] refer to Figure 1 to Figure 7 A steel pipe non-oxidation normalizing device shown includes a furnace 1, a transmission mechanism 2, a nitrogen station 3, a hydrogen station 4 and a water tank 5;

[0041] The transmission mechanism 2 runs through the interior of the furnace 1, and the furnace 1 is sequentially provided with a heating zone 1a, a heat preservation zone 1b, an air cooling zone 1c and a water cooling zone from the entrance to the exit. The water cooling area is connected;

[0042] The nitrogen station 3 is connected to the heating zone 1a, the heat preservation zone 1b and the air cooling zone 1c through the pipeline, the hydrogen station 4 is connected to the heating zone 1a and the heat preservation zone 1b through the pipeline, and the water tank 5 is ...

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Abstract

The invention relates to a non-oxidizing normalizing process of a steel pipe. The non-oxidizing normalizing process of the steel pipe is characterized by comprising the following steps of S1, pretreatment which comprises the following sub-steps of S11, preheating and heating; and S12, heat preserving, specifically, a conveying mechanism continues to convey the steel pipe forwards to a heat preserving area, the heat preserving temperature is 850-900 DEG C, and the heat preserving time is 6-8 min; S2, air cooling, specifically, nitrogen is fed into an air cooling area through a nitrogen station,the nitrogen is used as media, and used for fast cooling the steel pipe, and the steel pipe is cooled to 350-400 DEG C within the time of 1.5-2 min; S3, water cooling, specifically, a water cooling area is divided into three segments, the temperature rebounding of the steel pipe is 150-200 DEG C in the first segment of the water cooling area, that is, the temperature of the steel pipe is made tobe 500-600 DEG ; and in the first segment of the water cooling area and the second segment of the water cooling area, the steel pipe is gradually cooled to be 200 DEG C or below; and S4, discharging out of a furnace, air cooling is performed till a room temperature is achieved. The invention further discloses a device used for the non-oxidizing normalizing process of the steel pipe. Due to the non-oxidizing normalizing process of the steel pipe, the cooling speed is effectively controlled, the ideal hardness, organization and surface quality are achieved, cost is lowered, and the on-time delivery rate is increased.

Description

technical field [0001] The invention relates to the technical field of steel pipe heat treatment, in particular to a steel pipe non-oxidation normalizing process and device. Background technique [0002] Competitive steel pipes in today's market have a hardness of HB190-240, inner and outer decarburized layers within 0.03mm, fully decarburized layers within 0.05mm, and no scale on the surface. The traditional normalizing process adopts ordinary heat treatment furnace normalizing + fog Cold, the decarburization layer cannot be guaranteed, the surface oxide scale is serious, and the hardness is unstable, between HB160-190. Even if the hardness is barely qualified, three additional processes are required: ① Pickling the surface of the product to remove scale; ② Polishing the outer surface of the product; ③ Honing the inner surface of the product. To obtain the decarburized layer required by customers, the cost is 1,000-1,500 yuan / ton, and the delivery time is relatively long, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D1/74C21D9/08
Inventor 张亚军孙焕军赵小龙周泽
Owner ZHEJIANG MINGHE STEEL PIPE CO LTD
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