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Stainless Steel Essay

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Objectives Stainless steel is an alloy widely used in construction projects. It is an alloy of low carbon steel mixed with specific percentage of chromium. It can be commonly found in building and always work with concrete. The advantages of stainless steel are high strength, corrosion resistance and environmental friendly. Then, there are many types of stainless steel and have various physical and chemical properties. 329HT stainless steel (steel grade: 1.4462) is classified in duplex stainless steel which is heterogeneous phase (ferrite and austenite). Compare with other stainless steel samples (304HT and 316HTM), it contains the highest strength and corrosion resistance ability. Thus, it usually apply in the construction near the sea …show more content…

Stainless steel is more corrosion and rusting resistant than low carbon steel. In steel, the iron surface is easily form a oxide film and tends to form more oxide. This cause the oxide diffuse inside the alloy so rusting can occurs readily. However, stainless steel contains plenty of chromium. The chromium can form a passivation (oxide film) and obstruct the diffusion of the oxygen from surface to the internal structure. Also, the composition of Nickel (Ni) will corporate with chromium and increase the ability of corrosion resistant of stainless steel. For the physical properties of stainless steel, the strength of stainless steel is much higher than iron. The high strength of stainless steel is due to the low carbon content. The carbon atom can block the dislocation and prevent the deformation of the material. Some of the stainless steel contain several percentage of Molybdenum (Mo) and the strength of the stainless steel will further increase. According to the physical properties and high chemical resistant of stainless steels, they are widely used in Architecture and aircraft. The typical examples of the usage are bridge, airport and razor …show more content…

Molybdenum is a ferrite stabilizer. The performance of mo can be three time when the chromium content is higher than 18%. (c) Nitrogen Nitrogen is not only benefit in corrosion resistance. It also increase the strength of the stainless steel. The advantages of nitrogen is inexpensive and it has a great contribution in strength enhancement. Moreover, nitrogen can promotes the development of austenitic structure in stainless steel. The austenitic structure can improve the toughness because the austenitic structure can diminish the intermetallic content. (d) Nickel Nickel assists with chromium to prevent the corrosion. The nickel element is able to be a austenitic stabilizer. This mean it can change the lattice structure from body-centred cubic (bcc) to face-centred cubic (fcc). The construction of detrimental intermetllic phase can be postponed. The fcc structure also can profit in

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