奧氏體不銹鋼演講文檔

1、奧氏體不銹鋼演講文檔Austenitic stainless steel, refers to the austenitic at room temperature with stainless steel . The steel contains about 18% Cr, 8%10% Ni, C about 0. 1%, with a stable austenite structure. Austenitic chromium nickel stainless steel ineludes the famous 18Cr8Ni steel and high Cr-Ni series st

2、eel which ,on this basis, increases the content of Cr , Ni and Mo, Cut Si, Nb, Ti and other elements .The most part of it is austenite ,and there is a little ferrite phase in it 鐵素體的影響 And we all know it that ferrite phase appeared generally adverse effects on properties of austenitic stainless stee

3、l： such as the thermal processing have increased the tendency of crack； steel pitting corrosion resistance decreased in many corrosive environment (such as the production of urea )； under the high temperature and prolonged heating time, ferrrite will be transformed into sigma phase which make the st

4、eel brittle and so on.鐵素體的消除SO how to eliminate it? The fundamental way is to improve the austenite forming element content. Ni is the first choice of the elements, but from the economic point of view, Mn and N have been attracting people&apos；s attention. Especially N, its ability to inhibit th

5、e formation of ferrite is 30 times than Ni, but also improve the corrosion resistance and improve the strength of the effect.Production process由于合金元素(特別是鉆)含量高而碳含量又低多采用電弧爐 加氮氧脫碳(A0D)或真空脫氧脫碳(V0D)法大批量生產(chǎn)這類不銹鋼 材對于高級牌號的小批量產(chǎn)品可采用真空或非真空非感應(yīng)爐冶煉 必要時加電渣重熔。Due to the alloy elements (CR) content is high and carbon

6、 content is low, the use of arc furnace with argon o_ygen decarburization (AOD) or vacuum deo_idizing decarburization (VOD) method to mass produce this kind of stainless steel is popular, for senior grades of small batch products can be used with or without a vacuum induction furnace smelting, when

7、necessary with electroslag remelting.200 Series： chromium nickel manganese austenitic stainless steel300 series： chromium nickel austenitic stainless steel(304 )Chinese austenitic stainless steel grades have more than 40, The most monly used steel is the type of 18-8 (also called 304)In the evolutio

8、n of ponent based 18-8 stainless steelt mainly has the following important development：1) with Mo to improve the pitting and crevice corrosion resistance2) drop C or add Ti, Nb, reduce intergranular corrosion tendency3) plus Ni and Cr to improve the high temperature o_idation resistance and strength

9、4) with Ni to improve the resistemce to stress corrosion.5) plus S, Se improve the machinobility and surface precisionAustenitic stainless steel was published in Germanyin 1913, has been playing the most importemt role in stainless steel, and its production capacity and use of the total amount of stainless steel and about 70% of the total output and consumpt