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Steel pipe annealing equipment and steel pipe annealing technology

A technology of annealing equipment and annealing process, used in heat treatment equipment, manufacturing tools, furnaces, etc., can solve the problems of uneven hardness of steel pipes, low tensile strength and elongation of steel pipes, easy rupture of steel pipes, etc., to eliminate internal stress and yield. The effect of reducing strength and improving production efficiency

Active Publication Date: 2014-04-09
广东志达精密管业制造股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current steel pipe annealing process eliminates less internal stress of the welded pipe material, which makes the overall hardness of the steel pipe uneven. The tensile strength of the steel pipe material is 490-495Mpa, the yield strength is 360-365Mpa, and the elongation is 33-34%. The hardness is HRB80-82, the hardness of the weld is HRB99-100, the tensile strength and elongation of the steel pipe are low, which makes the steel pipe easy to break

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] Such as figure 1 As shown, a steel pipe annealing equipment includes a heat treatment furnace 2 and a cooling box 4. The heat treatment furnace 2 is provided with a feed port 261 and a discharge port 281, and the cooling box 4 is connected outside the discharge port 281. It is characterized in that the The heat treatment furnace 2 is provided with a protective gas filling port 27, and the inside of the heat treatment furnace 2 is provided with a first heating zone 21, a second heating zone 22, and a third heating zone in sequence from the feed port 261 to the discharge port 281. 23. The fourth heating zone 24 and the heat preservation zone 25, the first heating zone 21, the second heating zone 22, the third heating zone 23 and the fourth heating zone 24 are respectively provided with the first heating device 7, the second heating zone Two heatin...

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Abstract

The invention relates to steel pipe annealing equipment and a steel pipe annealing technology. The steel pipe annealing equipment comprises the following technological processes: A. conveying a steel pipe to a feeding roller table through an alignment device, and conveying at the speed of 16-27m / h; B. enabling the steep pipe to enter a thermal treatment furnace via an inlet sealing box and carrying out closed heat treatment on the steel pipe, and continuing to move the steel pipe forwards in the thermal treatment furnace at the speed of 16-27m / h, wherein the steel pipe orderly passes through a first heating area, a second heating area, a third heating area, a fourth heating area and a heat preservation area inside the thermal treatment furnace; the heating temperatures of the first heating area, the second heating area, the third heating area and the fourth heating area are orderly increased, and the thermal treatment furnace is filled with protective gas in the closed thermal treatment process; C. slowly cooling the steel pipe by a cooling box adopting circulating cooling water to cool after the steel pipe is discharged from the thermal treatment furnace; and D. enabling the steel pipe to enter an aggregate area through an outlet sealing box to finish the overall process after the steel pipe is discharged from the cooling box. By adopting the technology, the inner stress of the material after pipe welding can be removed, the steel pipe is uniform in hardness, high in tensile strength and high in ductility, the yield strength is reduced, and the steel pipe is flexible.

Description

technical field [0001] The invention relates to the technical field of steel pipe annealing, in particular to steel pipe annealing equipment and an annealing process thereof. Background technique [0002] The current steel pipe annealing process eliminates less internal stress of the welded pipe material, which makes the overall hardness of the steel pipe uneven. The tensile strength of the steel pipe material is 490-495Mpa, the yield strength is 360-365Mpa, and the elongation is 33-34%. The hardness is HRB80-82, and the weld seam hardness is HRB99-100. The tensile strength and elongation of the steel pipe are low, which makes the steel pipe easy to break. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a steel pipe annealing equipment with a simple and reasonable structure, and can eliminate the internal stress of the material after the welded pipe, so that the overall ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/30
Inventor 罗立新
Owner 广东志达精密管业制造股份有限公司
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