Chemical composition of chromium-nickel austenitic stainless steel Y1Cr18Ni9 (AISl303) and 18Ni9Se

Chemical Composition of Stainless Steel Y1Cr18Ni9 (AISI 303) and 18Ni9Se

Stainless steel is one of the most popular materials used in a wide range of applications, from automotive and aerospace to construction, medical, and power plants. The two stainless steels, Y1Cr18Ni9 (AISI 303) and 18Ni9Se, are two of the most common and well known stainless steels in use today. This article provides a short overview of the low temperature and cryogenic properties of the two stainless steels, as well as the chemical compositions which comprise them.

Y1Cr18Ni9 (AISI 303)

Y1Cr18Ni9 (AISI 303) is an austenitic stainless steel made of iron, 18% chromium, 8% nickel, and 1% yttrium. AISI 303 stainless steel is a corrosion and heat-resistant steel with a medium toughness and relatively high hardness. The high nickel content in AISI 303 increases its corrosion resistance and heat resistance compared to other stainless steels, making it a popular choice for applications such as food processing equipment, medical instrumentation and automotive parts. AISI 303 can be welded and machined for use in applications like ski bindings, elevator rollers, and conveyor rollers.

The chemical composition of Y1Cr18Ni9 (AISI 303) is as follows:

Iron - Balance

Chromium (Cr) - 17.00 - 19.00%

Nickel (Ni) - 7.00 - 10.00%

Yttrium (Y) - 0.20 - 0.60%

Carbon (C) - 0.15% max

Silicon (Si) - 1.00% max

18Ni9Se

18Ni9Se is a cast stainless steel made of iron, 18% nickel, and 9% selenium. 18Ni9Se has good cryogenic properties but has limited low-temperature toughness and is not recommended for temperatures below minus 80°C. 18Ni9Se is used for components that require a high corrosion resistance, such as offshore marine gear and hydroelectric pump components.

The chemical composition of 18Ni9Se is as follows:

Iron (Fe) - Balance

Nickel (Ni) - 17.00 - 20.00 %

Selenium (Se) - 8.0 -10.00 %

Carbon (C) - 0.12 % max

Manganese (Mn) - 0.4 % max

Silicon (Si) - 1.00 % max

Phosphorus (P) - 0.050 % max

Sulfur (S) - 0.030 % max

Conclusion

Y1Cr18Ni9 (AISI 303) and 18Ni9Se are two of the more commonly used stainless steels. Y1Cr18Ni9 (AISI 303) is known for its high corrosion resistance, heat resistance, and medium toughness, while 18Ni9Se is known for its good cryogenic properties but limited low-temperature toughness. Both of these stainless steels have distinct chemical compositions which give them their unique properties and make them suitable for various applications.

Y1Cr18Ni9 (AISI303) and 18Ni9Se are two different kinds of stainless steel, both of which are austenitic steels, meaning they possess a large amount of austenite at room temperatures.

Y1Cr18Ni9 is an AISI 303 type stainless steel alloy. This material was designed and developed by the American Iron and Steel Institute in the 1950s. It is a low-carbon steel that contains 18% chromium, and 8-10% nickel. This material is widely used in industrial and commercial applications due to its excellent corrosion resistance, heat resistance, and strength.

18Ni9Se is a type of austenitic stainless steel that contains 18% chromium, 9% nickel and 0.5-2.5% selenium. This material is superior to Y1Cr18Ni9 for its excellent oxidation and creep resistance. It is mostly used for applications in the nuclear industry due to its exceptional resistance to radiation where other stainless steels may be brittle.

Both Y1Cr18Ni9 and 18Ni9Se are versatile and have wide range of industrial applications. As a kind of austenitic steel, both of them possess high mechanical strength at low temperatures and excellent corrosion, oxidation and creep resistance, making them ideal for making components and components for machines that must withstand harsh environmental conditions.