Oxidation refers to the role of CO2, H2O, and O2 in the furnace gas during heating. That is, burning), reduce the material rate, and at the same time, the accumulation of iron oxide skin will cause the erosion of refractory material to reduce the use of the stove. In addition, the heating rate of iron oxide skin is much lower than the metal, affecting the heating of the billet.
1. The temperature of the steel pipe temperature steel does not oxidize before 800 ° C, and the temperature of the tube's billet reaches 800 ° C or higher. The speed of change is significantly increased;
2. High temperature stay time, the longer the tube stops in the high temperature zone, the more oxidized and burning, the more serious;
3. The oxidized atmosphere of the furnace gas, the more severe the oxidation and damage.
The influence of the above three is basically 6: 3: 1.
Dalvation -galvanized steel pipe heat treatment line high -pressure water removal scales
During the heat processing process of steel, the surface of the steel parts will produce varying degrees of oxidation with the height of the heating temperature and the length of time, and form different thickness of oxide. In order to improve the surface quality and size and accuracy of the steel pipe, during the hot rolling process of the steel pipe, the process of high -pressure water removal is used to remove the oxygen.
In the process of heat treatment heating, oxide skin will also be formed on the surface of the steel pipe, and the process of increasing high -pressure water de -scales has the following advantages:
1. Like the rolling process, the process of high -pressure water removal processes can significantly improve the surface quality of the steel pipe;
2. After the steel pipe is removed from the scales to remove the oxide, the steel pipe is cooled evenly and the heat exchange is accelerated during quenching, which can reduce the quenching deformation of the steel pipe and improve the cooling speed;
3. During the straight process of the steel pipe after the heat treatment, the steel pipe will produce a great friction to the straight roller and cause roller wear. When there is an oxide on the surface of the steel pipe Reduce roller wear;
4. No destructive detection after the heat treatment of steel pipes. If the surface of the surface is oxide, it will affect the detection effect. In severe cases, the scales will not be performed, and this situation can be avoided.
