General spiral pipe raw materials are Q235B, in the cold winter spiral pipe is also in line with the rules of heat and cold shrinkage, plus Q235B raw materials are very easy to rust, so how to winter cold treatment? In winter spiral steel pipe should be placed in the workshop, because the temperature in the workshop is relatively high compared to the yard, in the rain and snow climate outside the wall is not easy to temperature, it is not easy to rust.
 
    Spiral pipe outer wall spraying a potion, this potion can make the outer wall of the steel pipe and air barrier, postpone the steel pipe rust. Spiral steel pipe in the production process of regular magnetic, a rational magnetic, another is the process of magnetic, which brings great inconvenience to the construction, the need to demagnetize, so how to demagnetize it the following details ** demagnetization method: with a coil around the outside of the steel pipe, the coil is energized with alternating current, gradually reduce the current of alternating current until it is reduced to zero
 
    Demagnetization results: does not change the physical properties of spiral steel pipe, however, once again encountered the applied magnetic field, spiral steel pipe will be magnetized. Demagnetization: After heat treatment process, it can be more completely demagnetized, however, after demagnetization, the hardness and rigidity of spiral steel pipe will be changed.
 
    When the applied magnetic field is encountered again in the future, the applied magnetic field disappears, and the steel pipe will basically have no residual magnetism. Demagnetization method is: heat treatment process, about is: anaerobic heating to a certain temperature, and then, with 72 hours of gradual cooling to room temperature.