Chemical composition of 0Cr18Ni11Nb (AISI347) steel

Chemical Composition of AISI 347 Steel

AISI 347 is a type of stainless steel characterized by its excellent corrosion resistance, good strength at high temperatures, and enhanced creep resistance. It is also known for its good oxidation and wear resistance, making it ideal for many industrial applications. In this article, we will discuss the chemical composition of AISI 347.

AISI 347 is an austenitic, chromium-nickel stainless steel. It contains about nine to eleven percent chromium and around fifty to fifty-five percent nickel. Other alloying elements include, in smaller percentages, manganese, silicon, phosphorus, sulfur, and carbon. This combination of elements results in a stainless steel with a great deal of highly desirable properties.

The chromium content of AISI 347 is responsible for its excellent corrosion resistance in many environments, including those with chlorides present. Chromium forms a thin, tightly adherent protective layer of chromium oxide on the steel’s surface, which prevents further corrosion. The nickel content of 11%, along with the chrome, gives AISI 347 excellent resistance to stress-corrosion cracking.

The high levels of nickel also adds to AISI 347’s good mechanical properties. Its strength at high temperatures is excellent, as it is able to retain its strength up to temperatures around 1100°F (593°C). Its high strength coupled with its good creep resistance help AISI 347 make it ideal for many uses in industrial settings.

The presence of carbon, manganese, and silicon also give AISI 347 some desirable metallurgical characteristics. The molten form of AISI 347 remains stable and is homogeneous, which makes it very easy to cast. The presence of silicon also improves its scaling resistance. The small amounts of sulfur and phosphorus also improve machinability.

In summary, AISI 347 is an austenitic stainless steel that is characterized by its excellent corrosion resistance, good strength at high temperatures, enhanced creep resistance, and good oxidation and wear resistance. It contains about nine to eleven percent chromium and around fifty to fifty-five percent nickel. Smaller quantities of manganese, silicon, phosphorus, sulfur, and carbon are also present. All these elements combine to make AISI 347 an ideal choice for many industrial applications.

The alloy AISI347 is a stainless steel containing Niobium with chemical composition of carbon (Cr); Iron (Fe); Nickel (Ni); Manganese (Mn); Silicon (Si); Sulfur (S); Phosphorus (P); Chromium (Cr); and Niobium (Nb). The carbon content is 0.08%, the iron content is 17.00-19.00%, the nickel content is 10.00-12.00%, the manganese content is 2.00%, the silicon content is 1.00%, the sulfur content is 0.03%, the phosphorus content is 0.045%, and the Niobium content is 0.40-0.60%.

AISI347 is a heat-resistant grade of stainless steel. It is well-suited for high-temperature applications such as exhaust systems and headers. It is an austenitic stainless steel, so it has excellent corrosion resistance. It is more resistant than an austenitic grade such as 304. It is commonly used in the chemical, petrochemical, and power industries, but it can also be used for certain automotive and food processing applications.

AISI347 does have some limitations, however. It has a higher carbon content than some austenitic grades, so it is more susceptible to weld cracking. It is also not as heat-resistant as some other grades, such as 310, 321, and 309.

It is easy to machine and form, and has good machinability with its relatively high chromium content. It also has good toughness and workability, and can be welded with no pre-heating.

In summary, AISI347 stainless steel is a heat-resistant grade with excellent corrosion resistance and good weldability. It is well suited for high-temperature applications such as exhaust systems and headers, but it is more susceptible to weld cracking due to its higher carbon content. It is easy to machine and is relatively easy to weld with no pre-heating.