uns c70600 

The corrosion resistance of the stainless steel plate mainly depends on its alloy composition
Deposited on the surface of the stainless steel contain other x70 line pipe metal elements of attachments, or heterogeneous metal particles of dust in the humid air, attachments and stainless steel, the condensed water between the both together as a micro battery, triggers the electrochemical reaction, protective film is damaged, to call the electrochemical corrosion.
Stainless steel surface adhesion organic fluids (such as melon seeds, noodle soup, sputum, etc.), under the condition of water is oxygen, organic acid, organic acid to for a long time and are on the surface of the metal corrosion.
Stainless steel surface adhesion containing acid, alkali, salt substances (e.g., decorate the walls of caustic soda and lime water splash), cause local corrosion.
In pollution in the air (e.g., contains a lot of sulfur, carbon uns c68700 oxide, atmospheric nitrous oxide), in the condensation water, formation of sulfuric acid, nitric acid, acetic acid, liquid, chemical corrosion caused by the above situation can be caused by the destruction of the stainless steel surface protective film cause corrosion.
The corrosion resistance of the stainless steel plate mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, manganese, etc.) and internal organizational structure, is a chromium element plays the leading role. Chromium has the very high chemical stability, can be formed in the steel surface passivation membrane, metal and isolated, protect steel from oxidation, increase the corrosion resistance of steel sheet. After passivation membrane damage, corrosion resistance is decreased.
Number and representation
(1) with the international chemical element symbols and their symbols to represent the chemical ingredients, in Arabic letters to represent the content:
Such as: China, Russia 12 crni3a
(2) with a fixed number of digits to represent the class steel uns c70600 series or digital; Such as: the United States, Japan, 300, 400, 200.
(3) using the Latin alphabet and sequence of number, said purposes only.
International stainless steel marking method
The American institute of steel is to mark all kinds of standard level in the three figures wrought stainless steel. Among them:
1) stainless steel austenite size designation in 200 and 300 series of figures.
(2) the ferrite and martensite in shape with 400 series stainless steel digital representation. For example, some relatively common austenitic stainless steel is 201, 304, 316 and 310.
(3) ferritic stainless steel in 430 and 446 for tags, martensitic stainless steel in 410, 420 and 440 c for tags, bipolar (austenitic, ferritic).
(4), precipitation hardening stainless steel stainless steel and iron content less than 50% of the high alloy is usually USES the name of the patent or trademark name.