309 Stainless Steel Data Sheet

309 stainless steel is a high-quality and versatile material that is widely used in various industrial applications. It offers excellent resistance to heat, corrosion, and oxidation, making it an ideal choice for applications that require high performance under extreme conditions.

This type of stainless steel is composed of mainly iron, chromium, and nickel, as well as trace amounts of other elements. Its high chromium and nickel content provide superior resistance to corrosion and oxidation, even at high temperatures.

In addition to its excellent corrosion resistance, 309 stainless steel also has good weldability, which makes it easy to work with and suitable for different fabrication methods. It is often used in applications that require welding, such as in the manufacturing of boilers, heat exchangers, and other high-temperature components.

Specification Sheet Overview

Introduction:

309 stainless steel is an austenitic stainless steel used in high-temperature applications. It is often used in industries such as petrochemical, heat treatment, and chemical processing. Its excellent high-temperature resistance and corrosion resistance, coupled with its superior strength, make it an ideal material for high-temperature applications.

Strength and Hardness:

309 stainless steel has a minimum yield strength of 30 ksi, minimum tensile strength of 75 ksi and hardness of 95 max HRB. It is a high strength and high toughness material with low magnetic permeability.

Corrosion Resistance:

309 stainless steel exhibits excellent corrosion resistance in both oxidizing and reducing environments. It resists attack from sulfurous, acetic, citric, and tartaric acids, alkaline solutions, and molten salts. In addition, it has good resistance to stress corrosion cracking and intergranular corrosion.

Heat Resistance:

309 stainless steel is designed for high-temperature applications. It is capable of withstanding temperatures up to 1900°F (1038°C) without its mechanical properties being affected. The material also exhibits excellent oxidation resistance, maintaining its surface integrity when exposed to high temperatures for extended periods.

Fabrication and Welding:

309 stainless steel can be easily fabricated and welded. Its low carbon content minimizes carbide precipitation during welding, thereby reducing the risk of intergranular corrosion. The use of 309L filler rods or electrodes is recommended for welding.

Applications:

309 stainless steel is used in a wide range of high-temperature applications such as heat exchangers, kilns, furnace parts, and annealing covers. It is also used in chemical processing equipment, petrochemical plants, and gas turbine parts.

Conclusion:

309 stainless steel is a high strength, high toughness material with excellent corrosion and heat resistance. Its low carbon content makes it a good choice for welding and fabricating without compromising its mechanical or corrosion properties. With its superior attributes, it is an ideal material choice for high-temperature applications in various industries.

General Properties

One of the key advantages of 309 stainless steel sheet is its excellent resistance to high-temperature environments. This material can withstand temperatures up to 1900°F (1038°C), which makes it ideal for use in industrial furnaces and heat exchangers. It also has a low coefficient of thermal expansion, which means it can withstand thermal shock and resist deformation at high temperatures.

Furthermore, 309 stainless steel sheet has excellent weldability and formability, which allows it to be easily fabricated into various shapes and sizes. It is also highly resistant to pitting and crevice corrosion, making it ideal for use in harsh chemical environments.

In addition, 309 stainless steel sheet is easy to maintain and clean, and it retains its appearance and structural integrity over time. This material is also non-magnetic, making it ideal for applications in electronic and electrical industries.

Corrosion Resistance

One of the key benefits of 309 sheet is its exceptional resistance to corrosion. It is highly resistant to oxidation, which can cause other metals to deteriorate and weaken over time. This makes 309 an excellent choice for use in harsh environments or applications where exposure to corrosive substances is likely.

Another advantage of 309 stainless steel is its outstanding strength. It is a robust material that can withstand heavy use and abuse, making it an ideal choice for applications where durability is crucial. Whether it is used in construction, manufacturing, or other industries, 309 stainless steel sheet is a reliable material that can be trusted to perform well under the most demanding conditions.

Creep Properties

Available thicknesses for Alloy 309/309S:

Typical Creep Properties

Chemical Analysis

Weight % (all values are maximum unless a range is otherwise indicated)

Physical Properties

Density

0.285 lbs/in³
7.89 g/cm³

Specific Heat

0.12 BTU/lb-°F (32 – 212°F)
502 J/kg-°K (0 – 100°C)

Modulus of Elasticity

28.5 x 10⁶ psi
193 GPa

Thermal Conductivity 212°F (100°C)

9.0 BTU/hr/ft²/ft/°F
15.6 W/m-°K

Melting Range

2500 – 2590°F
1480 – 1530°C

Electrical Resistivity

30.7 Microhm-in at 68°C
78 Microhm-cm at 20°C

Mechanical Properties

Typical Values at 68°F (20°C)

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