Ural Federal University (Ekaterinburg, Russia):

G. A. Orlov, Dr. Eng., Prof., Chair of Metal Forming
Yu. N. Loginov, Dr. Eng., Prof., Chair of Metal Forming
A. G. Orlov, Magister, e-mail: grorl@mail.ru

The paper os devoted to evaluation of the quality of hot-rolled tubes using the complex quality parameters. The average arithmetic and geometrical complex parameters are compared, as well as the parameters obtained with usage of possibilities of entering the allowable requirements by these parameters on the example of tubes for oil and gas industry. It is shown that all parameters have close values. The complex evaluation of the tubes manufactured via the existing and improved technologies is conducted, the effect of improvement of separate parameters on the quality of rolled tubes in general is assessed. Comparison of the complex quality parameters of tubes that were rolled via two technologies has been done in accordance with Harrington desirability scale. The parameter of the existing technology corresponds to the sufficient quality level according to the standards, while the parameter of the improved technology corresponds to allowable and good quality level.

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