Type 309 (UNS S30900/1.4828)

Description

Type 309 stainless steel is a chromium-nickel austenitic steel with a 0.08% carbon composition.

It’s highly corrosion resistance, heat resistance, oxidation resistance of up to 2000⁰ F, and overall strength.

It is highly resistant to sulfidation but low resistance to carburization and should not be used in atmospheres with a high carburizing effect.

It has the same machining properties as Type 304 stainless steel, meaning it to be stamped, rolled, drawn, and formed with ease.

Common Names:  It’s commonly known as Chromium-Nickel steel.

Executive Standards/Grades:

• JIS: G4309
• ASTM: ATSM A240
• DIN:1.4828
• GB:0Cr18Ni9
• EN: X15CrNiSi20-12

Chemical Properties:

Type 309 stainless steel has the following chemical composition:

• Carbon- 0.08%
• Manganese- 2.00%
• Chromium- 22.0% – 24.0%
• Nickel- 12.0% – 15.0%
• Molybdenum- 0.75%
• Sulphur- 0.03%
• Copper- 0.75%
• Phosphorus-0.045%
• Silicon- 1.00%

Mechanical Properties:

• Hardness (HRB) – 95 (maximum)
• Reduction Area (%) – 50
• Elongation (%) – 40
• Yield Strength(Mpa) – 205
• Tensile Strength(Mpa) – 515
• Poisson’s Ratio: 0.27 – 0.303
• Melting range:2550-2590 ⁰ F

Physical Properties:

• Density (1000 Kg/M3) – 0.289 lbs./ in3 9.01 g/cm3
• Elastic Modulus(Gpa) – 29 × 103 in tension and 11.2 × 0103 in torsion
• Thermal Conductivity (Btu/ft hr ⁰ F) – 9.0
• Specific Heat (Btu/lb. hr ⁰ F) – 0.12
• Electrical Resistivity (Micro ohm-in) – 68 ⁰ F (20 ⁰C)
• Magnetic Permeability (H) – 200 Oersteds

Key Features:

• High corrosion resistance – Provide great resistance from corrosion, especially in marine atmospheres
• It has a high oxidation resistance
• High tensile strength
• Heat resistant to high temperatures – It can withstand temperatures up to 2000⁰ F

Forms Available:

Stainless Steel Type 309 is available in different forms such as:

• Pipe
• Flat sheet
• Round
• Ribbon wire foil
• Coil strip

Applications:

Because of these properties, mainly its ability to effectively work under high temperatures, Type 309 stainless steel has a wide range of applications including:

• Oven and kiln lining
• Fireboxes and furnaces
• Aircraft engines
• Car exhaust parts
• Heat exchangers
• Boiler baffles

Possible Alternatives Grades:

Type 309 stainless steel has some possible alternatives that can be used. Such as:

• 309S – the low carbon version of 309.
• 309H – has chemical compositions of SAE wrought stainless steel.
• 310- an austenitic heat-resistant alloy with excellent resistance to oxidation under mildly cyclic conditions.
• 310S – low carbon version of 310.
• 310H – has carbon content and is a preferred choice for high-temperature applications.
• 330- an austenitic, nickel-chromium-iron-silicon alloy that has outstanding resistance to oxidation and carburization up to 2200°F.

FAQs:

• What is the difference between type 304 and type 309 stainless steel?

Type 309 is a heat-resisting austenitic stainless steel, with .23% chromium. It is around 5% more than type 304 and thus better for corrosion at high temperatures

• Is type 309 stainless steel magnetic?

Type 309 stainless steel is a non-magnetic alloy in annealed but slightly magnetic in cold conditions.

• Does type 309 stainless steel rust?

Alloy 309 is more corrosion resistant than most steel alloys because of the high chromium in it.

Get A Free Quote Now!