Rust removal and maintenance methods for straight seam welded pipes
Date:2024-09-12 View(s):104 Tag:straight seam welded pipe, straight seam welded pipe rust, straight seam welded pipe removal
Maintenance of straight seam welded pipe equipment has become a headache. Straight seam welded pipe equipment plays a significant role in life and work. Generally, the surface of straight seam welded pipe fittings is required to reach near white grade (Sa2.5. The practice has proved that the construction process of epoxy, ethylene, phenolic, and other anti-corrosion coatings is commonly used for straight seam welded pipe fittings. This rust removal level can almost remove all scales, rust, and other contaminants, and the anchor pattern depth reaches 40~100μm, which fully meets the adhesion requirements of the anti-corrosion layer and the steel pipe, while the spray (blasting) rust removal process can achieve near white grade (Sa2.5 technical conditions with low operating costs and stable and reliable. When rust occurs on straight seam welded pipes, they should be treated by the rust removal methods and methods to ensure the quality and performance of straight seam welded pipes, so that they can be used in different industries and fields, making important contributions and roles in the construction industry. That is, the total kinetic energy E of the abrasive applied to the steel pipe per unit time and the kinetic energy E1 of the single particle abrasive. The rust removal speed of the steel pipe depends on the type of abrasive and the displacement of the abrasive. In the formula: m is the spray (blasting) amount of abrasive; V is the running speed of abrasive; m is the size of single particle abrasive. It is related to the abrasive crushing rate. The crushing rate directly affects the interest of the surface treatment operation and the cost of the rust removal equipment. When the equipment is fixed, m is a constant, y is a constant, so E is also a constant, but due to the crushing of the abrasive, m1 changes. Therefore, generally, an abrasive with a lower loss rate should be selected, which is conducive to improving the cleaning speed and extending the life of the blade. To achieve the ideal rust removal effect, the abrasive should be selected according to the hardness of the surface of the straight seam welded pipe equipment, the original rust level, the required surface roughness, the coating type, etc. For single-layer epoxy, two-layer, or three-layer polyethylene coating, the mixed abrasive of steel sand and steel shot can easily achieve the ideal rust removal effect. Steel shot has the effect of strengthening the steel surface, while steel sand has the effect of etching the steel surface. The mixed abrasive of steel sand and steel shot (usually the hardness of steel shot is 4050HRC and the hardness of steel sand is 5060HRC) can be used on various steel surfaces, even on C and D-grade rusted steel surfaces, the rust removal effect is also very good.