Stainless Steel 309 / 310 Angles & Flats

What are Stainless Steel 309 / 310 Angles & Flats?

Stainless Steel 309 and 310 are high-temperature austenitic stainless steels with higher chromium and nickel content compared to standard grades. They are specifically designed to perform in elevated temperature environments.

• SS 309: Suitable for moderate high-temperature applications
• SS 310: Designed for extreme high-temperature resistance

Angles and flats are structural components used in fabrication, construction, and industrial applications.

Key Functions:

• Provide structural strength at high temperatures
• Resist oxidation and scaling
• Maintain mechanical properties under heat
• Ensure durability in extreme environments

Chemical Composition of SS 309 / 310

Typical Composition:

SS 309:

• Chromium (Cr): 22% – 24%
• Nickel (Ni): 12% – 15%
• Carbon (C): ≤ 0.20%

SS 310:

• Chromium (Cr): 24% – 26%
• Nickel (Ni): 19% – 22%
• Carbon (C): ≤ 0.25%

Higher chromium and nickel content provide superior heat and oxidation resistance.

Key Features of Stainless Steel 309 / 310 Angles & Flats

• Excellent high-temperature strength
• Outstanding oxidation and scaling resistance
• Good corrosion resistance
• High thermal stability
• Good mechanical strength at elevated temperatures
• Long service life in extreme heat conditions

Mechanical Properties

• Tensile Strength: ~520–750 MPa
• Yield Strength: ~210–300 MPa
• Elongation: ~40%
• Hardness: Moderate

Physical Properties

• Density: ~7.9 – 8.0 g/cm³
• Melting Range: ~1400–1450°C
• Modulus of Elasticity: ~200 GPa
• Thermal Conductivity: ~14–16 W/m·K
• Thermal Expansion: Moderate to high

Corrosion Resistance

SS 309 / 310 angles and flats provide excellent resistance to:

• Oxidation at elevated temperatures
• Thermal cycling environments
• Mild chemical environments
• High-temperature scaling

These grades are ideal for applications involving continuous or intermittent heating.

Heat Treatment

Stainless Steel 309 / 310 is not hardened by heat treatment.

Typical Process:

• Annealing for improved ductility

Weldability

SS 309 and 310 offer good weldability.

Welding Methods:

• TIG (GTAW)
• MIG (GMAW)
• SMAW

Best Practices:

• Use appropriate filler materials
• Control heat input
• Avoid overheating

Machinability

• Moderate machinability
• Requires proper tooling and lubrication
• Maintain controlled cutting speeds

Standards & Specifications

• ASTM A276
• ASTM A240
• ASTM A479
• UNS S30900 / S31000

Available Types of Angles & Flats

We offer:

• Equal Angles
• Unequal Angles
• Flat Bars
• Polished Flats
• Custom Fabricated Sections

Sizes & Specifications

• Thickness: 3 mm to 100 mm
• Width: Up to 200 mm (flats)
• Length: Up to 6000 mm or as required

Surface Finish Options:

• Mill Finish
• Polished Finish
• Matte Finish

Applications of Stainless Steel 309 / 310 Angles & Flats

• Furnace Parts : Heat treatment equipment
• Power Plants : High-temperature structures
• Petrochemical Industry : Processing units
• Kilns & Boilers : Structural components
• Aerospace Industry : Heat-resistant components

Quality Testing & Inspection

• Chemical composition testing
• Mechanical testing
• Dimensional inspection
• Surface quality inspection
• Positive Material Identification (PMI)

Mill Test Certificates (MTC) and third-party inspection reports are provided.

Packaging & Delivery

• Export-grade wooden packaging
• Protective wrapping
• Proper labeling and traceability
• Safe and timely global delivery

Why Choose Virami Steel Hub?

• Trusted SS 309 / 310 supplier in Mumbai
• Ready stock and fast delivery
• Competitive pricing
• Custom sizes available
• International quality standards
• Strong export network
• Dedicated customer support

Conclusion

Stainless Steel 309 / 310 Angles & Flats are the ideal choice for applications requiring excellent heat resistance, oxidation resistance, and strength at elevated temperatures. Their superior performance in extreme conditions makes them essential for high-temperature industrial applications.

Virami Steel Hub delivers premium-quality stainless steel products that ensure reliability, durability, and long-term value.