为了避免喷砂后加热钢管时产生新的锈迹，在喷砂前应将钢管预热至40℃-5

In order to avoid new rust when heating the steel pipe after sandblasting, the steel pipe should be preheated to 40℃-50℃ before sandblasting, and the water vapor on the surface of the pipe mouth should be dried with a flame heater. Due to the influence of winter temperature, Properly increase the preheating temperature to 70-80℃, clean the repaired parts and blast and remove rust to Sa2.5 level

In order to avoid new rust when heating the steel pipe after blasting, the steel pipe should be preheated to 40 degrees C-50 degrees C before blasting, first use a flame heater to dry the water vapor on the surface of the pipe mouth and, due to the effect of winter temperature, should appropriately increase the preheat temperature to 70-80 degrees C, clean the filling site and blast the rust to Sa2.5.

In order to avoid new rust when heating the steel pipe after sand blasting, the steel pipe should be preheated to 40 ℃ - 50 ℃ before sandblasting, and the water vapor on the surface of the pipe orifice should be dried with a flame heater. Due to the influence of winter temperature, the preheating temperature should be appropriately increased to 70-80 ℃, and the joint coating should be cleaned and sandblasted to Sa2.5<br>