Physical Properties of Low Chromium Ferritic Stainless Steel 0Cr11Ti (AISI409), 00Cr11Ti (AISI409L)

Physical properties of Low-Chromium Ferritic Stainless Steel 0Cr11Ti(AISI 409) and 00Cr11Ti(AISI 409L)

Low-chromium ferritic stainless steels 0Cr11Ti (AISI 409) and 00Cr11Ti (AISI 409L) are commonly used stainless steels in a variety of applications. Both of these grades present a combination of high mechanical strength and good formability, corrosion resistance and oxidation resistance. This paper presents an overview of their physical properties.

0Cr11Ti(AISI 409) is the most common grade of low-chromium ferritic stainless steel. It has a minimum chromium content of 11.5 wt-% and a maximum carbon content of 0.08 wt-%. It exhibits a ferritic microstructure with an austenitic-like structure after solution treatment. 0Cr11Ti is characterized by a good combination of mechanical properties and corrosion resistance in addition to good formability and cold-working characteristics. In terms of mechanical strength, 0Cr11Ti exhibits a yield strength of 260 to 700 MPa and an ultimate tensile strength of 470 to 960 MPa. Its elongation is between 10 and 55%, depending on the grade and heat treatments. The resistance to corrosion is in the range of 2 to 4.5% after exposure to a salt spray test, while its oxidation resistance is in the range of 450-650°C.

The 00Cr11Ti (AISI 409L) grade is a low-chromium ferritic stainless steel with a maximum carbon content of 0.03%. 00Cr11Ti exhibits a ferrite+austenite dual phase microstructure. It is characterized by the combination of high mechanical strength and excellent corrosion and oxidation resistance. In terms of mechanical properties, 00Cr11Ti has a yield strength of 280-800 MPa and an ultimate tensile strength of 500-1000 MPa. Its elongation ranges from 10 to 45%. This grade has good formability and workable hardness at about 50 HRC. It is characterized by a good corrosion resistance with a salt spray test of 3 to 6%. Its oxidation resistance is between 400-650°C.

Both 0Cr11Ti (AISI 409) and 00Cr11Ti (AISI 409L) grades of low-chromium ferritic stainless steel have a good combination of mechanical strength and corrosion and oxidation resistance. 0Cr11Ti can provide a higher strength compared to 00Cr11Ti, but the latter provides better corrosion resistance. Both grades are widely used in different applications, as they offer a good combination of formability, mechanical strength, corrosion resistance and oxidation resistance.

Low Chromium Ferritic Stainless Steel 0Cr11Ti(AISI409) and 00Cr11Ti(AISI409L)

Low Chromium Ferritic Stainless Steel 0Cr11Ti(AISI409) and 00Cr11Ti(AISI409L) are low cost stainless grades with excellent oxidation and corrosion resistance. They are also known as Type 409 and Type 409L respectively in the AISI (American Iron and Steel Institute) nomenclature.

0Cr13Ti(AISI409) is ferromagnetic and has a deposition rate of about 2.25% chromium. It has excellent corrosion resistance in mildly reducing environments and outstanding oxidation resistance up to 980℃. It exhibits good toughness and ductility in both hot and cold conditions, giving it useful characteristic in a range of applications.

00Cr11Ti(AISI409L) by comparison is slightly non-magnetic and has a lower chromium deposition rate of 0.75%. This grade is commonly used in domestic appliances, exhaust systems,automotive and in the petrochemical industry. It has excellent oxidation and corrosion resistance and is resistant to nitric and acetic acids.

Mechanical properties of 0Cr13Ti(AISI409) and 00Cr11Ti(AISI409L) include tensile and yield strength of 490 and 300MPa (N/mm2) respectively. They are also resistant to creep and fatigue at elevated temperatures, with Elongation % at 10.

In conclusion, Low Chromium Ferritic Stainless Steel 0Cr11Ti(AISI409) and 00Cr11Ti(AISI409L) are low cost stainless steel grades with excellent oxidation and corrosion resistance, good toughness, tensile and yield strength, and resistance to creep and fatigue at elevated temperatures. Their properties make them suitable for a range of applications.