Stainless steel is an alloy of iron and chromium used in a variety of applications in many industries. It is especially valued for its corrosion resistance and strength at high temperatures. One stainless steel that is particularly suitable for certain applications is 309S stainless steel, also known as UNS S30908.
309S is an austenitic chromium-nickel stainless steel commonly used in high temperature applications. The high chromium and nickel content of 309S give it good corrosion resistance, while the low carbon content helps prevent carbide precipitation during welding. This makes 309S an ideal choice for many furnace and boiler applications.
What are the characteristics of 309S stainless steel?
- Moderate high temperature strength
- Ease of manufacture
- Good anti-vulcanization performance
- Good welding performance
Is there another name for 309S stainless steel?
309S is the most widely used austenitic stainless steel in the heat-resistant range. It combines good scaling properties with excellent oxidation resistance up to 2000oF. 309S can be used in coil, plate, strip, rod, wire, pipe, pipe and fittings. All product forms are produced in accordance with ASTM A240 and ASME SA240 specifications.
Other names for 309S stainless steel include:
* UNS S30908
* Werkstoff Nr. 1.4833
What is the composition of 309S stainless steel?
309S stainless steel is an austenitic chromium-nickel stainless steel containing about 19% chromium and about 9% nickel. Higher chromium and nickel content make it more corrosion resistant than 304 stainless steel. It is commonly used in high temperature applications such as furnaces, kilns and ovens.
Carbon C: ≤0.08
Manganese Mn: ≤2.00
Silicon Si: ≤1.00
Chromium Cr: 22.0-24.0
Nickel Ni: 12.0-15.0
Phosphorus P: ≤0.045
Sulfur S: ≤0.030
Nitrogen N: 0.10~0.16
What are the mechanical properties of 309S stainless steel?
309S stainless steel is an austenitic chromium-nickel stainless steel with good formability and weldability. Due to its relatively high carbon content, 309S is more resistant to intergranular corrosion than 304 and 310 grades of stainless steel.
The mechanical properties of 309S stainless steel are as follows:
Yield strength: ≧205
Tensile strength: ≧520
Elongation after breaking: ≧40
Melting point: 1480-1530 degrees Celsius
Annealing temperature: 1000-1150 degrees Celsius
What are the thermal properties of 309S stainless steel?
309S stainless steel is an austenitic chromium-nickel stainless steel with excellent corrosion resistance and heat resistance. The thermal properties of 309S stainless steel include a high melting point, high thermal conductivity, and low coefficient of thermal expansion. These properties make 309S an ideal material for high temperature applications such as furnaces and industrial heat exchangers.
What is the oxidation resistance of 309S?
309S has a maximum carbon content of 0.08%, while 304 and 310 grades have 0.04% and 0.05% carbon respectively. Therefore, 309S is often used in welding applications that require frequent fusing, such as in the food, beverage and pharmaceutical industries. Additionally, 309S has good oxidation resistance and can withstand temperatures up to 1900°F before scaling.
What should be paid attention to when welding 309S stainless steel?
There are a few things you need to keep in mind when welding and joining 309S stainless steel. First, because 309S is an austenitic stainless steel, it is not as easy to weld as some other grades. In fact, it can be very difficult to solder if you don’t have the right equipment and experience. That said, welding and joining 309S stainless steel can be done relatively easily if you do have the right tools and expertise.
One of the most important things to remember when welding 309S stainless steel is that you must use a filler material that is compatible with the base metal. Incompatible filler materials can cause problems such as cracking or porosity. Also, it is important to use proper welding techniques when working with this type of stainless steel. If you are new to welding austenitic stainless steel, it is best to consult a professional before attempting any project.
What are the misunderstandings that 309S stainless steel needs to pay attention to?
There are many myths about stainless steel. Some common misunderstandings about 309S stainless steel are as follows:
- Myth: Stainless steel is a completely rust-proof material.
Fact: While stainless steel does have excellent corrosion resistance, it’s not completely rust-free. Under certain conditions, such as exposure to salt water or high humidity, 309S stainless steel can rust.
2.Myth: Stainless steel is a maintenance-free material.
Fact: While stainless steel is relatively easy to maintain, it still requires some basic care to keep it looking its best. Regular cleaning and polishing will help prevent rust and other stains on metal surfaces.
- Myth: Stainless steel is an expensive material.
Fact: Stainless steel is actually quite affordable, especially when compared to other materials like titanium or precious metals.
What are the applications of 309S stainless steel?
309S stainless steel is widely used in high temperature applications. Its high chromium and nickel content provides considerable corrosion resistance, excellent oxidation resistance and excellent heat resistance. When operating in the 900-1600°F (425-870°C) range, 309S has good creep strength and is suitable for a variety of applications including:
- Furnace lining
- Kiln lining
- Annealing cover
- Radiant tubes
309S stainless steel is an austenitic stainless steel with excellent corrosion resistance and oxidation resistance at high temperatures. It is often used in applications with frequent temperature changes because it maintains strength and resists scaling even under extreme conditions. With its comprehensive properties and ease of fabrication, 309S stainless steel has become a popular choice for many manufacturing industries. Whether you’re looking for a material to use in construction or need heat-resistant material for your next project, consider trying 309S Stainless Steel!