Classification and cleaning method of spiral submerged arc welded pipe

Classification by manufacturing process

(1) The manufacturing process of seamless steel tube can be divided into hot rolling (extrusion), cold rolling (drawing) and hot expanding steel tube.

(2) Welded pipes can be divided into straight welded pipes, spirally welded pipes, butt-welded pipes with sheet coil and hot-expanded pipes according to the manufacturing process.

Classification by shape

Steel pipe can be divided into round pipe, square pipe, rectangular pipe, octagonal pipe, hexagonal pipe, D-shaped pipe, pentagonal pipe, complex section pipe, double concave pipe, five-petal plum-shaped pipe, conical pipe, corrugated pipe, melon-shaped pipe, double-convex pipe and so on.

Classification by use

Steel pipes can be divided into pipes, pipes for thermal equipment, steel pipes for machinery industry, petroleum, steel pipes for geological drilling, container steel pipes, steel pipes for chemical industry, special purpose steel pipes and so on.

Cleaning of spiral welded steel pipe: Solvents and emulsifiers are used to clean the steel surface to remove oil, grease, dust, smoothing agent and similar organic substances, but it can not remove rust, oxide skin, welding flux, etc. on the steel surface, so it is only used as an assistant tactic in anti-corrosion production.

Eastern and Western Rust Removal: First of all, steel brushes and other things are used to polish the steel surface, which can remove loose or warped scales, rust, welding slag and so on. Hand-operated tools can reach the Sa2 level, power things can reach the Sa3 level. If the steel surface is adhered to a solid oxide scale, the results of rust removal are not considered, and the depth of anchor lines required for anti-corrosion construction can not be reached.

Pickling: Chemical and electrolytic methods are commonly used for pickling treatment. Pipeline corrosion protection only uses chemical pickling, which can remove oxide scales, rust and old coatings. Sometimes it can be used as reprocessing after sandblasting and rust removal. Chemical cleaning can make the appearance reach the necessary cleanliness and roughness, but its anchor lines are shallow and easy to pollute the situation.

Spraying (throwing) rust removal: Spraying (throwing) rust removal is a high-speed torsion of spraying (throwing) blades driven by high-power motors, so that steel sand, steel balls, wire segments, minerals and other abrasives in the centrifugal effect of the steel pipe surface spraying (throwing) disposal, not only can completely eliminate rust, oxide and dirt, and steel pipe in the effect of ferocious impact of abrasives and friction, but also can reach the required requirements. Average roughness.