(1) Increase in the length of the annealing furnace, the furnace from the original length to 23.832m 34.852m, since the annealing time to solve the problem caused by the increase in production problems.
(2) Using the roof flat flame burner and burner Forward burner combination, solved due to the use of the forward end portion of the burner and a side burner caused by lateral transverse sectional temperature unevenness solved drawn tube annealing temperature is low part of the problem.
(3) The use of heat-resistant steel in high temperature section hearth roll, water cooled roll against the water-cooled rolls causes the contact portion of the low-temperature region, the annealing temperature is reduced in a longitudinal section of a temperature gradient.
(4) Changing the original lower portion and an upper portion of the annealing furnace baffle wall of the structure and improve the life of the baffle wall. Since the original block firewall short life, often resulting in baffle wall to collapse, resulting in clogging of burner end lower portion, so that the lower portion of annealing furnace heating capacity decrease, resulting in a large temperature difference between the furnace profile. Annealing after the transformation to solve this problem, to ensure the full annealing of cold drawn tubes.
Through equipment modification, technical and economic indicators have reached the annealing process requirements, annealing quality improved significantly, so that the mechanical properties of cold drawn seamless qualified rate of 97.913% before transformation increased to 99.015% after the transformation.
