Hardness index and cleaning of cold drawn tubes

- Mar 31, 2019-

In the process of operation, the cold drawn tube is mainly heated according to its process requirements, and is heated by the upper limit temperature to prevent low temperature heating. When the operation is performed, the billet heating temperature is increased by 20 to 30 ° C, respectively, and the effect is better.

The cold drawn tube should be used for the inclined bottom furnace to make the billet heat evenly, so as to prevent the appearance of the yin and yang surface. At the same time, after the material is finished, the furnace door is closed to reduce heat loss. Strictly control the rolling rhythm to ensure that the billet is heated and penetrated, avoiding the phenomenon of perforated black spiral. Use high quality heavy oil to ensure the quality of the billet heating.

Cold drawn tube cleaning

The cold drawn tube must be completely removed from the tube end before cleaning, and then cleaned with a hard tube nozzle. If there is oil or grease in the tube, the hard tube projectile should be used to remove the tube more effectively. Contaminants. If there is corrosion, welding slag, etc. in the pipe, the friction projectile should be used to remove these pollutants first. The friction projectile can be used multiple times until it is confirmed that these contaminants have been removed.

Cold drawn tube hardness index

The ability of the cold-drawn tube to resist the hard object in the surface of the cold-drawn tube during operation is called hardness, and it can be effectively divided into Brinell hardness according to its test method and application range. Hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness. Commonly used for pipes are Brinell, Rockwell and Vickers hardness.

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