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(2) nickel stainless steel only in the chromium complexes can be fully manifested. Nickel is the formation of austenite in alloying elements, nickel and chromium when used in combination, can make into a duplex structure of austenite and ferrite microstructure by single-phase ferrite after heat treatment, can improve the strength , which makes it a stronger stainless steel corrosion resistance and good deformation properties World Steel Pipe News .
addition of carbon and chromium have a strong affinity to form a series of carbide. The higher the carbon content in steel, the more the formation of chromium carbide, chromium content in solid solution is relatively reduced, the corrosion resistance of steel will be reduced World steel pipe network editing .
Chrome-nickel stainless steel
(1) chromium play a major role in the corrosion resistance of stainless steel
sulfur harmful impurities, sulfur and nickel form Ni3S2 compounds Ni3S2 and nickel in the 625 ° C, the formation of low melting point eutectic, located on the grain boundary, when the heat distortion temperature of more than eutectic melting point, cracking along the grain boundaries, resulting in the so-called "thermal embrittlement" phenomenon. Ni3S2 generated by the nickel and sulfur at room temperature can cause cold crisp.
chromium decided to stainless steel corrosion resistance of the main elements can make the steel containing chromium stainless steel in oxidizing media passivation phenomena, that is to form a thin film on the surface chromium enrichment layer membrane. The higher the chromium content in steel, corrosion resistance stronger. In addition, the mechanical and technological properties of chromium steel can play a good strengthening effect.
chromium, nickel element to match the composition of chrome-nickel stainless steel, a good stainless steel. Adding a large number of nickel in which stainless steel to improve its corrosion resistance and process in order to get a single austenite. In strong ductility and toughness at room temperature and low temperature, non-magnetic, has better resistance to intergranular corrosion can.
when the carbon content between 0.1% -0.3%, after annealing, carbon graphite will state in the lattice boundaries precipitated the destruction of the binding force between the grains, strongly reduce the strength and ductility of the nickel, so that the processing deformation difficult.
2, the impact of impurities on the performance of