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Before drawing thick steel plating, finished steel surface needs acceptance, it must remove the oxide scale. Removing the stainless steel surface oxide scale many ways there Acid pickling, electrolytic pickling, alkaline a pickling acid complex hydride reduction method. Here Acid pickling in a solution. Thick-walled seamless steel pipe prior to electroless copper plating, both inside and outside of each thick-walled seamless steel pipe to release or put on ordinary carbon steel pipe, then bundling because ordinary carbon steel pipe with thick-walled steel pipe by very tight Thus, the copper sulfate solution, the iron and chromium, nickel and other metals is formed by using his original power. Because iron is more active, the original anode of the battery iron, chromium, nickel and other metals is the primary cell cathode. Time i.e. has the following reaction. Spinning is a cross-rolling because of the development of military industry, astronauts and other cutting-edge technology, a large diameter, thin-walled, precise size, high strength pipe, shaped pieces or cylindrical parts. The key technologies thick-walled steel concrete composite material must make core concrete and steel wall closely, to obtain a composite effect, so as to achieve the design of composite performance. Ordinary concrete stick specific volume shrinkage after hardening exists a certain degree, and therefore must be designed to have the core concrete and controlled volume expansion properties. Steel oxide scale there are two: one is at room temperature, in a humid environment, and there SO2, CO2 dissolved in the water generated in the catalytic oxide is rust. This red-brown rust layer, is composed of two monovalent and trivalent iron compounds and oxygen and composed of crystal water; other is generated at a high temperature iron oxide, commonly known as the scale, black or dark brown dark . It is generated in two cases: one generated when rolling rolling or welding metal, the other is due to the oxygen partial pressure during the heat treatment is greater than the equilibrium oxygen partial pressure generated by iron oxide scale (in protection except when the annealing atmosphere or a reducing atmosphere). With different slab surface temperature, heating and cooling systems, the oxygen content of the surrounding medium and other factors, composition and structure of the billet surface oxide scale also lends another. When the slab after hot pressed into the surface of the strip surface oxide scale pickling in shades of pits left behind, especially once pressed into the oxide scale, after pickling in the rough bottom of the pit is often accompanied not wash The iron oxide particles, seriously affect the surface quality cold-rolled plate.

Remove,thick,wall,steel,pipe,s

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