engleski

Chemical preparation of tubes before cold drawing

Prior to the technological process of cold drawing of tubes through dies, a very important part is preparation for drawing and pre-treatment of tubes. In the production of cold drawn tubes, pre-treatment involves the chemical removing of impurities and oxides, and subsequently applying the lubricant on to the surface of the tubes. For cleaning, pickling, bath of hydrochloric or sulphuric acid is the most commonly used cleaning agent, which is kept at elevated temperatures. This is a significant problem from an environmental point of view, since it is performed at higher temperatures and with chemically aggressive media. This review paper describes the existing procedures for the chemical preparation of niobium microalloyed steel tubes and the ways of reducing the impact on environment, as well as new approaches that are possible alternatives for surface preparation, without the usage of chemically aggressive media.

steel tubes, chemical preparation, cold drawing

nije evidentirano