How to remove corrosion and rust of seamless steel pipes
WanSteel is China’s largest seamless steel pipe and spiral steel pipe manufacturer, supplier and exporter. Our Seamless Steel pipe types are:Boiler tubes,ASTM A192 Steel Tubes for High-pressure Steel Boiler Tube,Tubes for Heat Exchanger and Condensers,Seamless steel pipe for ship building usage,Seamless Precision tubes,Tubing and Casing
Low and medium pressure boiler pipeSeamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. seamless pipes dominates 65% of market share in Chinese boiler industry.
As carbon steel, Q345 is basically non-corrosion resistant. If it is placed outside or in a moist environment without a good storage area, carbon steel will rust. This requires the removal of his rust.
The first method: pickling
Commonly used chemical and electrolytic pickling process, two methods do use only pipeline anticorrosion chemical pickling, can remove scale, rust, old coating, sometimes can be used as sandblasting derusting after reprocessing. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, it is easy to pollute the environment because of its shallow anchor grain.
Using solvent, emulsion steel surface cleaning, to remove oil, grease, dirt, lubricants, and similar organic matter, but it cannot remove rust, scale, such as welding flux on the surface of the steel, so only as auxiliary means in the anti-corrosion production.
3. Tool rust removal
The surface of steel is polished by means of steel wire brush, which can remove loose or upturned oxide, rust and welding slag. Cold drawn seamless steel tube derusting hand tools can reach Sa2 level, power tool cleaning can reach grade Sa3, if solid iron oxide adhered on the surface of the steel, tools, cleaning effect is not ideal, anchor pattern depth of anticorrosion construction requirements
4: spray (throw) to remove rust
Spray (cast) shot derusting spray is driven by high-power motor (cast) shoot high-speed rotating blades, make steel grit, steel shot, segment, minerals and other abrasive wire under the action of centrifugal force on steel pipe surface spray (cast) processing, not only can thoroughly remove rust, oxides and dirt, and steel pipe under the action of abrasive violent impact and friction, also can achieve the required uniform roughness.
After spraying (throwing), the mechanical adhesion between the antiseptic layer and the surface of the pipe can be enhanced.