201 Grade Pickled Stainless Steel Coil
Production introduction Our factories are outstanding into pickling of stainless steel. It is fully acid-washed and passivated to remove all kinds of oil, rust, scale, weld spots and other dirt. After treatment, the surface becomes uniform silver white, which greatly improves the corrosion...
Our factories are outstanding into pickling of stainless steel. It is fully acid-washed and passivated to remove all kinds of oil, rust, scale, weld spots and other dirt. After treatment, the surface becomes uniform silver white, which greatly improves the corrosion resistance of stainless steel. It is suitable for various types of stainless steel parts and plates.
Chemical Composition of Stainless Steel Coil
201 vs 304 Grade Stainless Steel
Generally, the price of 201# is lower than 304#.
2. Durability and capable processing
Density of 201 stainless steel is lower than 304 stainless steel but the durability of 201 stainless steel is higher 10% then 304 stainless steel.
3.Corrosion Resistance capable comparison
When we compare the chemical content of 201 stainless steel and 304 stainless steel show the lower Chrome in 201 stainless steel than 304 stainless steel is about 2%. This makes the corrosion resistance of 201 stainless steel is lower than 304 stainless steel.
4. Surface color
201 stainless steel contains higher Manganese and this element causes the towel rack surface more dark, but this difference is too tiny and users may not be able to tell, especially for mirror polished frame.
Why stainless steel needs to be passivated?
(1) Improve the thermodynamic stability of stainless steel in environmental media. The passivated stainless steel is in a positive position in the metal potential sequence, that is, close to the noble metal, and the chemical property is stable, while the unpassivated stainless steel is in an activated state, at a position where the potential is relatively negative, and is similar to ordinary steel.
(2) Prevent local corrosion of stainless steel. Generally, various corrosion phenomena easily caused by stainless steel, including pitting corrosion, intergranular corrosion, wear corrosion and corrosion fatigue, are related to the surface state. Passivation can eliminate the origin of each corrosion and make the potential of the critical point corrosion positive.
(3) Passivation gives the stainless steel surface sufficient cleanliness. Passivation can remove metal contaminants from the surface layer of stainless steel, as well as impurities embedded in stainless steel, such as copper, zinc, cadmium, lead, and low-melting metals, free iron, so that the surface contains chromium and nickel enriched and stabilized. The contamination of these metals is prone to corrosion damage in stainless steel.
(4) Elimination of hot working oxides on stainless steel surfaces. The use of a nitric acid solution containing hydrofluoric acid in the passivation process has the effect of etching the oxide and passivating the surface.
(5) Passivation treatment as a post-treatment, stainless steel is required to have various pretreatments. Passivation treatment is carried out after sandblasting, shot peening, electrochemical polishing and chemical polishing to improve the surface state of the stainless steel.
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