Thick Walled Stainless Steel Tube Surface Treatment Process
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Thick Walled Stainless Steel Tube Surface Treatment Process

Thick-walled stainless steel tube surface treatment process weld defects exsit more serious problems, the use of hand-processing methods to compensate for mechanical polishing, grinding marks generated, resulting in uneven surface and affect appearance. Only the weld surface inconsistencies acid passivation, also resulted in uneven surface and affect appearance. Pickling and passivation is difficult to remove scratches whole, nor can a variety of scratch generated in the process, and the scratch can not be removed due to welding spatter adhering to the surface of stainless steel and carbon steel, splash and other impurities, resulting in chemical or electrochemical corrosion and rust corrosion occurs under conditions of corrosive media presence.

After polishing passivation uneven hand polished pickling passivation of larger workpieces, it is difficult to achieve uniform treatment effect, can not get the desired uniform surface. And work costs, materials costs are also high. 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, scratch bump, drag, hammering caused by human factors, such as more serious, making the surface treatment more difficult, but also the treatment of rust after the main. Equipment factors profiles, sheet roll bending, bending process, resulting in scratches and creases generation is the main reason rust after treatment. Thick-walled stainless steel pipe raw materials procurement, storage, due to lifting, bump and scratches during transport produce more serious, is one of the reasons for the generation of rust.

Thick-walled stainless steel tube surface treatment should take preventive measures which should be stored in special thick-walled stainless steel pipe storage racks, storage racks should be wood or painted steel stent surface or mat rubber mat, with the steel and other metal material isolation. When stored, the storage location should be easy lifting, relatively isolated from other material storage areas, should protective measures to avoid dust, oil, rust contamination of stainless steel. When the thick-walled stainless steel seamless pipe lifting, should be dedicated spreader, such as lifting belt, special chucks, etc., prohibited the use of ropes to avoid scratching the surface; and when lifting and placing, should avoid the impact of the 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 and isolation precautions to prevent dust, oil, rust contamination of stainless steel. Do not drag, to avoid bump, scratch. Thick-walled stainless steel tube to clean polished surface treatment, if any damage should be polished, especially caused by scratches and splashes contact with carbon steel, damage caused by cutting slag must be carefully cleaned thoroughly polished clean. Suitable mechanical polishing to be used for polishing a polishing tool, requiring treatment uniform, and to avoid over-polishing and re-scratches. Before dusting degreasing pickling and passivation of stainless steel parts, must remove oil, scale, dirt and other debris by technology. Water blasting 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 pickling passivation pieces must be in strict accordance with the requirements of the passivation process.

After washing and drying pickling passivation, the process should be carried out in strict accordance with and, rinsed, dried thoroughly to remove residual acid. Protection stainless steel surface after treatment, should be prepared to protection, to avoid secondary pollution personnel touch and grease, dust and other debris. Avoid re-processing of stainless steel surface after treatment is completed, you should avoid re-processing of the parts or products.


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