What are the common derusting the surface methods of Q345B straight seam steel pipe?

During the construction of oil and gas pipelines, the surface treatment of the Q345B straight seam steel pipe is one of the key factors that determine the service life of the pipeline. The surface treatment of Q345B straight seam steel pipe accounts for about 50% of the layer life. Therefore, the surface treatment method of straight seam steel pipes should be continuously improved in strict accordance with the requirements of the layer specification on the surface of the straight seam steel pipe. The main methods of removing embroidery of the straight seam steel pipe are as follows:

1. Cleaning
Solvents and emulsions are used to clean the surface of steel to remove oil, grease, dust, lubricants and the like, but it cannot remove rust, oxide scale, welding flux, etc. on the surface of steel, so it is only used as an auxiliary means in the defense operations.

2. Pickling
Generally, two methods of chemical and electrolysis are used for pickling. Pipes only use chemical pickling to remove oxide scale, rust, and old coatings. Sometimes they can be used as a reprocessing after sandblasting and rust removal. Although chemical cleaning can achieve the cleanliness and roughness of the surface, its anchor lines are shallow and easily pollute the surrounding environment.

3. Derusting tools
Mainly use tools such as wire brushes to polish the steel surface, which can remove loose oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach the Sa2 level, and the rust removal of power tools can reach the Sa3 level. If the steel surface is attached with solid oxide scale, the tool rust removal effect is not ideal, and the anchor pattern required by the construction cannot be achieved.

4. Spray rust removal
Jet rust removal is driven by a high-power motor to drive the jet blades to rotate at a high speed, so that steel shot, steel grit, iron wire, minerals and other abrasives will be sprayed on the surface of the straight seam steel pipe under the action of the centrifugal force of the motor. In addition, the straight seam steel pipe can achieve the required uniform roughness under the action of the violent impact and friction of the abrasive.