Stainless steel professional noun explain?
Release date:[2009-8-8]   Review[639]Time

Common ground says, stainless steel is not easy to rust steel, actually part of stainless steel, with stainless steel, and the acid resistance ( resistance ). Stainless steel does not rust and corrosion resistance is due to its surface chromium oxidation film ( film ) formation. This does not rust and corrosion resistance is relative. Test shows that the air, water, steel in weak acid medium and oxidizing medium, the corrosion resistance of chromium in steel with the water content increases, when the chromium levels reach a certain percentage, steel corrosion resistance mutations, i.e. from rusty easy to rust, corrosion resistant to corrosion from. Many of the classification of stainless steel. According to the room temperature structure classification, a martensitic, Austenitic, Ferritic and double phase stainless steel; according to the major chemical composition classification, basically can be divided into chromium stainless steel nickel and chromium stainless steel two systems; by use of specific resistance of stainless steel, stainless steel, resistant to sulfuric acid nitric acid resisting stainless steel and so on, according to the corrosion resistance types can be divided for pitting corrosion of stainless steel, stainless steel, resistant to stress corrosion resistance to intergranular corrosion of stainless steel; according to the functional features of classification can be divided into non magnetic stainless steel, free cutting stainless steel, stainless steel, high strength steel and low temperature. Because the stainless steel material with excellent corrosion resistance, moldability, compatibility as well as in a wide temperature range and strong toughness series features, so in the heavy industry, light industry, supplies industry and the building decoration industry has achieved widespread application.

Austenitic stainless steel

At room temperature with austenite stainless steel. Steel containing Cr approximately 18%, Ni8%~10%, C is about 0.1%, with a stable austenite. Austenitic chromium nickel stainless steel including the prestigious 18Cr-8Ni steel and on the basis of increased Cr, Ni content and adding Mo, Cu, Si, Nb, Ti and other elements of development of high Cr-Ni series steel. Austenitic stainless steel non-magnetic and has high toughness and plasticity, but its strength is low, not possible through phase change to intensive, can only through the cold hardening. As join S, Ca, Se, Te and other elements, it has good cutting performance. This kind of steel in acid medium corrosion and oxidation resistance, if containing Mo, Cu and other elements can be resistant to sulfuric acid, phosphoric acid and formic acid, acetic acid, urea and other corrosion. The amount of carbon in the steel if less than0.03% or Ti, Ni, can significantly improve the resistance to intergranular corrosion. High silicon austenitic stainless steel concentrated nitric acid would have good corrosion resistance. As a result of austenitic stainless steel with comprehensive and good comprehensive properties, in all walks of life to gain a wide range of applications.

Ferritic stainless steel

In the use of state to ferrite microstructure consisting mainly of stainless steel. Chromium content in 11%~30%, has a body centered cubic crystal structure. This kind of steel is not generally contain nickel, sometimes also contain a small amount of Mo, Ti, Nb wait for element, this kind of steel with high heat conductivity, thermal expansion coefficient is small, good oxidation resistance, stress corrosion resistance superior features, much used in the manufacture of atmospheric water vapor, water resistance, and oxidation of acid corrosion of parts. This kind of steel is poor plasticity after welding, plastic and corrosion resistance obviously reduce the disadvantages, which limits its application. The secondary refining technology ( AOD or VOD ) can be used to make carbon, nitrogen, gap elements are greatly reduced, thus making this kind of steel is widely used.

Austenite - ferrite dual phase stainless steel

Is the austenite and ferrite organization each account for about half of the stainless steel. In C containing lower, the content of Cr in18%~28%, Ni content in 3%~10%. Some steel also contains Mo, Cu, Si, Nb, Ti, N and other alloy elements. This kind of steel with austenitic and ferritic stainless steel, ferrite, plasticity, toughness and higher, no brittleness at room temperature, intergranular corrosion resistance and welding performance were significantly increased, while also maintaining a ferritic stainless steel475 ℃ embrittlement and high coefficient of heat conductivity, having superplastic characteristics. Compared with austenitic stainless steel, high strength and intergranular corrosion resistance and resistance to chloride stress corrosion is improved obviously. Duplex stainless steel having excellent resistance to pitting corrosion, is also a kind of nickel saving stainless steel.

Martensitic stainless steel

Through heat treatment can adjust its mechanical properties of stainless steel, common ground says, is a kind of hardenable stainless steel. Typical brands such as 2Cr13, Cr13,3Cr13,4Cr13 etc.. After the pure fire of high hardness, strength and toughness of different tempering temperatures with different combinations, mainly used for steam turbine blades, tableware, surgical operation instrument. According to the differences in chemical composition, martensitic stainless steel can be divided into martensite steel and martensitic chromium nickel steel two. According to the organization and strengthening mechanism is different, also can be divided into martensitic stainless steel, martensite and austenite ( or half Martensite Precipitation Hardening Stainless steel ) and Maraging Stainless steel.

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