Thick-walled stainless steel pipe piling pipe surface treatment process problems and solutions

Thick wall stainless steel piling pipe surface treatment processing problems in the process of weld defect is more serious, using manual mechanical polishing treatment methods to compensate, resulting in grinding marks, resulting in uneven surface and affect appearance. Inconsistent surface passivation pickling welds only, but also caused uneven surface and affect appearance. Pickling and passivation is difficult to remove scratches whole, nor can a variety generated during processing to remove scratches, and can not remove the scratches, welding spatter adhering to the surface of stainless steel and carbon steel, splash and other impurities, resulting in a in the presence of corrosive media, chemical etching or electrochemical corrosion and rust. Polishing uneven hand polished after passivation pickling passivation treatment on larger workpieces, it is difficult to achieve uniform treatment effect, which can not be satisfactory uniform surface. And work expenses, materials costs are also higher. Limited capacity pickling pickling and passivation paste is not a panacea for plasma cutting, flame cutting and productivity and black oxide, more difficult to remove. Scratches caused by human factors more serious in the lifting, transportation and construction process, bump, drag, hammering scratches caused by human factors such as more serious, making the surface more difficult, but also the main reason for rust treatment. Equipment factors profiles, sheet roll bending, bending process, causing scratches and creases are also the main reason for rust treatment. Thick-walled stainless steel piling pipe raw materials procurement, storage process, due to lifting and transportation process produces more serious bump and scratches, but also one of the causes rust.

Thick-walled stainless steel piling pipe surface treatment should take precautionary measures, which should be special thick-walled stainless steel tube storage storage racks, storage racks should be wood or steel frame or painted surface mat with rubber pads to carbon steel and other metal material isolation. Storage, storage location should be easy lifting, and other materials storage area is relatively isolated, should protective measures to avoid dust, oil, rust on stainless steel contamination. Thick-walled stainless steel pipe lifting should use a dedicated spreader, such as lifting belts, special chucks, etc., prohibited the use of rope to avoid scratching the surface; and in the lifting and placement should be avoided shock bump caused by scratches. Thick-walled stainless steel pipe transport, the application of means of transport (such as car, car batteries, etc.), and shall be clean with isolation precautions to prevent dust, oil, rust contamination of stainless steel. Prohibited drag, avoid the bump, scratch. Thick-walled stainless steel tube cleaning polished surface treatment, if any damage should be polished, especially caused by contact with carbon steel scratch and splash, the damage caused by cutting slag must be carefully and thoroughly cleaned polished clean. Mechanical polishing using an appropriate polishing tool for polishing, request processing uniform, and to avoid over-polishing and re-scratches. Dust stainless steel parts during degreasing pickling passivation, you must remove the oil by technology, scale, dirt and other debris. Water sandblasting according to different processing requirements, use of different micro-glass beads, different process parameters, and to avoid overspray and so on. Pickling and passivation of stainless steel parts must be in strict accordance with pickling passivation passivation process requirements. After cleaning and drying pickling passivation should be in strict accordance with technical and, rinse and dry thoroughly to remove residual acid. Protected stainless steel surface treatment has been completed, should be prepared to protect and avoid touching and oil, dust and other debris secondary pollution. Prevent further processing of stainless steel surface treatment has been completed, the parts or products should be avoided reprocessed.