0Cr18Ni9Cu3 (302HQ) chemical composition

Composition of AISI 302HQ

AISI 302HQ is an austenitic stainless steel that possesses higher corrosion resistance than that of other austenitic stainless steels due to the presence of higher chromium and lower carbon content. AISI 302HQ is a type of stainless steel categorized as an 18-8/Cr-Ni. This 18-8 stainless steel has a maximum carbon content of 0.15% and a maximum chromium content of 17%. Also, it has a maximum nickel content of 9% and a maximum molybdenum content of 2%.

In terms of chemical composition, AISI 302HQ contains, by weight %:

• C – 0.15%

• Mn – 2%

• Si – 0.75%

• P – 0.045%

• S – 0.03%

• Cr – 17%

• Ni – 9%

• Mo – 2%

AISI 302HQ is a multipurpose grade which is good for welding, forming and cold working operations. It offers higher oxidation resistance than that of other 18-8 grades due to its higher nickel content. AISI 302HQ is commonly used in petrochemical applications, power generating equipment, oil and gas refining, chemical processing, and healthcare facilities. It is also used in applications that require corrosion resistance together with good dimensional stability, high tensile strength, non-magnetic properties and formability.

The high corrosion resistance of AISI 302HQ is attributed to its superior nickel-chromium content which provides a pleasant resistance to corrosion in both acidic and neutral environments. The high chromium content in the alloy improves its resistance to oxidation, carburization and its resistance to stress scaling under elevated temperatures. It also has excellent resistance to pitting and crevice corrosion which makes AISI 302HQ suitable for use in a wide range of applications.

In terms of mechanical properties, AISI 302HQ has a proof strength of 275MPa (min) with a tensile strength of 690MPa (min) and a yield strength of 340MPa (min). Its elongation at break is 40%. Its modulus of elasticity is 212,000MPa. AISI 302HQ has good cold workability which makes it suitable for cold working. Its forming capabilities include spinning, pinning and coining. Its machinability ratings are equivalent to iron and is M30 in terms of the machinability index.

In terms of physical properties, AISI 302HQ has a density of 8.00g/cm3 and a melting point ranging from 1480°C – 1540°C. Its electrical resistivity is 360 microOhms•in at 20°C. AISI 302HQ has excellent non-magnetic properties which are derived from its higher nickel content as compared to other 18-8 grades. The composition of AISI 302HQ makes it readily formable and weldable, making it suitable for many applications which require outstanding mechanical properties and elevated temperature resistance.

Overall, AISI 302HQ is a multipurpose grade of stainless steel that is widely used due to its superior corrosion resistance along with its excellent mechanical properties, non-magnetic properties and formability. It is commonly used in petrochemical applications, power generating equipment, oil and gas refining, chemical processing, and healthcare facilities. This 18-8 grade of stainless steel has a maximum carbon content of 0.15%, a maximum chromium content of 17%, a maximum nickel content of 9% and a maximum molybdenum content of 2%. It offers good oxidation resistance, great corrosion resistance and excellent formability and weldability, making AISI 302HQ a suitable choice for applications that require these features.

302HQ is a stainless steel grade with approximately .030% carbon, 18-20% chromium, 10-13% nickel, 2-3% molybdenum, and 0.12% nitrogen. It is a slightly higher carbon version of the standard 304 stainless grade, and has higher strength at elevated temperatures. It is generally the grade of choice where the additional benefits of high temperature strength and oxidation resistance are not necessary.

302HQ has excellent forming, drawing, and spinning qualities, and can be hardened by cold working. It can be heat treated for low temperature tempering, however tempering between 550-656℃ should not be performed as it could reduce the strength of the material due to precipitation of chromium carbides.

302HQ is a general purpose stainless steel grade and is recommended for applications such as screw machine production, threaded fasteners and molds. It is also suitable for applications requiring welding and cold forming.

302HQ is usually used in applications where an environment that is non-corrosive is present. It is especially suitable for the food and beverage industry, as even in the presence of foodstuffs such as dairy and eggs, this grade of stainless steel does not corrode. It also has good ductility and toughness, making it an ideal choice for automotive, aerospace and commercial cookware applications.

In terms of chemistry, 302HQ is composed of approximately .030% carbon, 18-20% chromium, 10-13% nickel, 2-3% molybdenum, and 0.12% nitrogen. It also contains trace amounts of iron, manganese, phosphorus, silicon, sulfur, and titanium.

Overall, 302HQ is a versatile, general purpose grade of stainless steel which can be formed and welded, and is also suitable for many food and beverage applications. Although 302HQ may lack the corrosion resistance of higher grade stainless steels and have slightly lower temperature strength, this grade is a great option for any application where the superior formability of 302HQ is required.