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In the stainless steel market, engineers and metalworkers often ask what is special about AISI 321 steel (also known as SUS 321 and UNS S32100)? This stainless steel grade has an outstanding combination of advantages that can meet the needs of many applications.

AISI 321 steel is an austenitic type of stainless steel, with a nickel-chromium content of 25 percent and a titanium addition of five percent. Titanium is an important element in the process of tempering this steel, especially when it is welded into a worksite. It is used in applications which require resistance to strong oxidizing media, as well as to moderately carburizing atmospheres.

The addition of titanium in AISI 321 steel helps to form titanium carbides along grain boundaries in the welded metal. These carbides form a hard, fine grain structure which gives this steel a kind of toughness that conventional austenitic steels do not possess. Its strength is even greater than that of standard grade 304 stainless steel.

At the same time, AISI 321 steel is more resistant to scaling at higher temperatures than conventional austenitic steels, and is far superior to grade 304 in resisting oxidation at temperature up to 1600°F (871°C). In the range of 1500°F - 1600°F (816°C - 871°C), the oxidation resistance of AISI 321 steel is considerably better than that of other stainless steel grades, especially grade 304.

These advantages make AISI 321 steel nicely adoptable for welding, where its improved formability lies in its favor. AISI 321 steel can be said to be both corrosion and heat resistant, and welders should keep in mind that weldments aren’t subject to post-weld heat treatment. AISI 321 steel is resistant to intergranular corrosion in normal temperatures, and even in extreme temperatures, where it can stand up to temperatures up to 1500°F (816°C).

Due to its performance qualities, AISI 321 steel is used often in high temperature industrial areas and other applications that require resistance to corrosive environments. It is effective in areas of moderate to low chloride ion concentration.

In conclusion, AISI 321 is an excellent choice for applications that require resistance to strong oxidizing agents as well as carburizing atmospheres, and its benefits are seen in high temperature industrial areas that require corrosion resistance. The titanium addition in AISI 321 steel provides superior weld strength and toughness, and temperature scaling and oxidation resistance. The increased resistance to corrosion and scaling makes AISI 321 steel the ideal choice for applications in areas such as deicing and chemical processing.

Inconel 625 is an austenitic nickel-based superalloy with excellent resistance to oxidation and corrosion in a wide range of inorganic and organic acids. It is a material of choice for many industrial applications.

Inconel 625 is a member of the austenitic nickel-based superalloys family and contains about 22% chromium, 9% molybdenum, and 5% niobium. The addition of molybdenum and niobium gives Inconel 625 better properties than its predecessors such as Inconel 600 and Inconel 601. Inconel 625 has superior salt-water corrosion resistance, making it an excellent choice for marine applications.

Inconel 625 exhibits outstanding strength and ductility and it retains its properties at very high temperatures. It is non-magnetic, does not have a ferromagnetic response, and is non-hardenable. Inconel 625 also has excellent weldability.

Inconel 625 is mainly used in aerospace applications, gas turbine parts, heat exchangers and seawater equipment. Typical applications include heat treating components, oil and chemical processing equipment, nuclear fuel elements and valve components. It can also be used for structural applications in the form of bar, wire and sheet.

Inconel 625 is also known under the following designations: UNS N06625, 2.4856, NiCr22Mo9Nb, W.Nr. 2.4856, NiCr22Mo9Nb and IN 25CrMo4.

Overall, Inconel 625 has superior properties that make it an ideal material for many industrial applications. It is resistant to oxidation and corrosion in a wide range of inorganic and organic acids, and it is able to withstand extremely high temperatures. Its weldability and resistance to chloride stress-corrosion cracking also make Inconel 625 a highly desirable material in many engineering applications.