Nickel austenitic stainless steel valve is the main alloying element, its role is largely one million austenitic, and stable to get fully austenitic steel group, so that the steel has good strength and plasticity, toughness, and has good cold and hot workability and cold forming and welding, low temperature and no magnetic performance, while improving the thermodynamic stability of the austenitic stainless steel, not only than the same chromium, molybdenum content of ferrite and martensite such as stainless steel will have a better not rust and oxidation resistance of the performance of the medium, and the surface membrane stability, which makes the steel also has more excellent resistant to some reducing the performance of the medium. 1 nickel, nickel is one million and strong influence stability of austenite and expand in austenite phase elements, in order to obtain a single austenitic organization, when the steel contains 0. The minimum necessary 18% 1% carbon and chromium nickel content of about 8%, which is the most famous 18 Basic points of 8 cr-ni austenitic stainless steel and austenitic stainless steel, with the increase of nickel content, the remnants of ferrite can be completely eliminated, and significantly reduce the tendency of sigma phase formation; Martensite hydrocarbon temperature decrease at the same time, there is not even the lambda - M phase transition, but the increase of nickel content can reduce carbon solubility in the austenitic stainless steel, so that the carbide precipitation tends to increase. 2 the performance impact of nickel on austenitic stainless steel, especially on the mechanical behavior of chromium nickel austenite stainless steel negative influence mainly by nickel to determine the influence of the stability of austenite, the stainless steel Industrial Valves sinosteel may occur within the scope of the nickel content of the martensitic transformation, with the increase of nickel content, reduce the pp plastic raise strength of steel, has a stable of austenitic organization cr-ni austenitic stainless steel toughness ( Including extremely low temperature toughness) Very good, and therefore can be used as a low temperature steel, it is well known, to have a stable austenitic organization of chromium manganese austenitic stainless steel, the addition of nickel can further improve its toughness. Nickel also can significantly reduce the cold hardening tendency of austenitic stainless steel, this is mainly due to the stability of austenite increase, reduce or even eliminate the martensitic transformation in the process of cold working, cold hardening of austenitic itself at the same time effect is not obvious, cold hardening tendency of stainless steel, nickel austenitic stainless steel cold hardening rate reduction, and reduce steel at room temperature and low temperature strength, improve the effect of plastic, determines the increase of nickel content is advantageous to the austenitic stainless cold forming performance, increase the nickel content also can reduce or even eliminate - 18 8 and 17 - 14 - 2 type cr-ni 9 forceps) Delta ferrite of austenitic stainless steel, so as to improve its thermal performance, however, the decrease of the delta ferrite will have an unfavorable influence on the weldability of the steel increases wire welding hot cracking tendency, in addition, the nickel also can significantly improve the chromium manganese nitrogen ( Nickel chromium manganese nitrogen) Austenitic stainless steel hot working performance, which can improve the yield of the steel in austenitic stainless steel, the addition of nickel and with the increase of nickel content, increase the thermodynamic stability of the steel, austenitic stainless steel has better not rust and oxidation resistance of medium performance, and with the increase of nickel content, reducing medium resistance has been further improved. Worth pointing out that austenitic stainless nickel or improve many medium type transgranular stress corrosion resistance of the only important elements. Nickel in various acid medium corrosion resistance of austenitic stainless steel valves, need to point out that under the condition of some of the high temperature and high pressure water, the increase of nickel content in steel and alloy type of intergranular stress corrosion sensitivity increases, but the adverse effects will be due to the increase of chromium content in the steel and alloy reduced or suppressed. With the content of nickel in the magnetic card austenitic stainless steel, its produce intercrystalline corrosion critical carbon content is reduced, the steel intergranular corrosion sensitivity increases, as for austenitic stainless steel corrosion and crevice corrosion resistant performance, the effect of nickel is not significant, in addition, nickel and also improve the high temperature oxidation resistance of austenitic stainless steel, the main improved chromium and nickel oxide film composition, structure and performance is reduced, and the nickel content is higher, the more harmful, it is mainly due to the grain boundary in one million caused by low melting point nickel sulfide in steel.
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