Steel pipe annealing equipment and its annealing process

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...

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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