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SS 309 and SS 309S Stainless Steel Angle Channels are austenitic stainless steel grades designed to withstand elevated temperatures and corrosive environments. These channels exhibit excellent oxidation resistance up to 1000°C, making them suitable for thermal and furnace applications. Their high chromium and nickel content ensures superior corrosion resistance even in aggressive atmospheres. SS 309 is known for its strength and durability under heat stress conditions. SS 309S, the low-carbon version, offers enhanced weldability and reduced carbide precipitation. Both grades are commonly used in industrial structures, furnaces, and power generation equipment. They provide reliable performance where both strength and corrosion resistance are critical.
The SS 309 / 309S Angle Channel features excellent mechanical properties combined with superior forming and welding capabilities. Due to their balanced composition, these channels can resist scaling and maintain mechanical integrity even during cyclic heating and cooling. They are widely used in industries such as petrochemical, refinery, and food processing. The channels are available in equal and unequal sizes, depending on design requirements. Their smooth surface finish and dimensional accuracy make them easy to fabricate into custom components. SS 309S, being low in carbon, minimizes intergranular corrosion during welding and post-weld heat treatment. This makes it ideal for fabrications that demand long-lasting, high-temperature stability.
These stainless steel angle channels are manufactured to strict dimensional tolerances ensuring consistent quality. SS 309 offers excellent strength and oxidation resistance under cyclic thermal conditions. It resists carburization and thermal fatigue in oxidizing and reducing environments. SS 309S provides the same oxidation resistance as SS 309 but offers better ductility after welding. Both materials retain good toughness even at sub-zero temperatures. They can be used for structural support, brackets, frames, and reinforcement in high-temperature zones. The high chromium content improves scaling resistance and surface stability under stress.
The channels are supplied in hot rolled or cold formed condition depending on application requirements. SS 309/309S Angle Channels are ideal for use in heat exchangers, furnace conveyors, and combustion chambers. Their excellent heat resistance and corrosion performance make them suitable for exhaust systems and kiln interiors. In addition, they perform exceptionally in environments exposed to sulphur dioxide and other industrial gases. The uniform structure of these steels ensures reliable machinability and consistent weld strength. Fabrication processes such as bending, cutting, and drilling can be performed without cracking or scaling. These properties ensure long service life even under extreme thermal cycling.
The versatility of SS 309 and 309S Angle Channels extends to numerous industrial uses. They are used in chemical processing plants, power plants, cement industries, and marine environments. Their ability to maintain strength under high temperatures ensures structural integrity over time. When used as supports or frames, these channels prevent deformation due to heat expansion. SS 309 is often used where heat resistance and oxidation control are the main requirements. SS 309S is preferred in applications requiring extensive welding and fabrication. Both provide an excellent combination of durability, flexibility, and corrosion resistance.
SS 309/309S Angle Channels are available in various sizes, thicknesses, and finishes to meet customer specifications. The channels conform to ASTM A276 and A479 standards for stainless steel bars and shapes. Each piece undergoes strict inspection to ensure dimensional precision and material integrity. Customers can request specific lengths, surface finishes, and end preparations. Polished, pickled, or mill finishes can be provided based on project requirements. The material’s consistent composition ensures easy welding with all standard stainless filler metals. It is an ideal choice for industries demanding long-term, high-temperature resistance.
Choosing SS 309 and 309S Stainless Steel Angle Channel guarantees reliability and performance in challenging conditions. Their superior mechanical strength and oxidation resistance reduce maintenance costs over time. With excellent forming, machining, and welding capabilities, they are ideal for custom fabrication projects. Whether for heavy structural support or precision machinery, these channels maintain stability under heat. Their ability to resist scaling and corrosion ensures longevity in harsh operating environments. Suppliers offer MTC (Mill Test Certificates) and full traceability with each order. SS 309 / 309S channels are the preferred choice for modern industries requiring heat and corrosion resistance.
Specification Table
| Grade | Standard | Material Type | Product Form | Size Range | Surface Finish | Delivery Condition |
|---|---|---|---|---|---|---|
| SS 309 / 309S | ASTM A276, A479, A240 / ASME SA276, SA479, SA240 | Austenitic Stainless Steel | Angle, Channel, Flat, Bar, Beam | 20mm × 20mm to 150mm × 150mm | Hot Rolled, Cold Drawn, Pickled, Bright, Polished | Annealed / Solution Treated |
| 309 | UNS S30900 / WNR 1.4828 | Heat Resistant Grade | Angle Channel | Thickness: 3mm – 12mm | Mill Finish / Brushed / Custom | Hot Rolled, Annealed, Descaled |
| 309S | UNS S30908 / WNR 1.4833 | Low Carbon Austenitic Grade | Angle Channel | Thickness: 3mm – 12mm | Polished, Pickled, Satin, Mirror | Annealed, Straightened |
| Form | Equal & Unequal Angle Channels | Lengths up to 6 meters or custom cut | With or without edge preparation | |||
| Applications | Furnace Parts, Heat Exchangers, Boiler Supports, Kiln Linings, Power Generation, and Chemical Processing Plants | |||||
Chemical Composition (Typical ranges for SSIS)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | SS 309 (%) | SS 309S (%) |
|---|---|---|
| Carbon (C) | ≤ 0.20 | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 |
| Chromium (Cr) | 22.0 – 24.0 | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 | 12.0 – 15.0 |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | SS 309 | SS 309S | Test Condition |
|---|---|---|---|
| Tensile Strength (MPa) | 515 – 690 | 515 – 690 | Room Temperature |
| Yield Strength 0.2% Proof (MPa) | 205 min | 205 min | Room Temperature |
| Elongation (% in 50mm) | 40 min | 40 min | Room Temperature |
| Hardness (Brinell HB) | ≤ 217 | ≤ 217 | Annealed Condition |
| Modulus of Elasticity (GPa) | 200 | 200 | — |
| Melting Point (°C) | 1398 – 1421 | 1398 – 1421 | — |
| Density (g/cm³) | 7.90 | 7.90 | — |
Equivalent Grades
| Grade | UNS | WNR | EN | JIS | BS | GOST |
|---|---|---|---|---|---|---|
| SS 309 | S30900 | 1.4828 | X15CrNiSi20-12 | SUS 309 | 309S24 | 20Kh23N13 |
| SS 309S | S30908 | 1.4833 | X12CrNi23-13 | SUS 309S | 309S16 | 20Kh23N13S2 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Size (mm) | Thickness (mm) | Leg Length (mm × mm) | Theoretical Weight (kg/m) | Approx. Weight (kg/ft) |
|---|---|---|---|---|
| 25 × 25 | 3 | 25 × 25 | 1.12 | 0.34 |
| 40 × 40 | 4 | 40 × 40 | 2.36 | 0.72 |
| 50 × 50 | 5 | 50 × 50 | 3.68 | 1.12 |
| 65 × 65 | 6 | 65 × 65 | 5.47 | 1.67 |
| 75 × 75 | 6 | 75 × 75 | 6.35 | 1.94 |
| 90 × 90 | 8 | 90 × 90 | 9.86 | 3.00 |
| 100 × 100 | 10 | 100 × 100 | 12.20 | 3.72 |
| 130 × 130 | 12 | 130 × 130 | 17.10 | 5.21 |
| 150 × 150 | 12 | 150 × 150 | 19.90 | 6.07 |
Types Of SS 309/309S Angal channel
Stainless Steel Angal & channel
Monel 400 Angal & channel
Inconel 600 Angal & channel
Hastelloy Angal & channel
Super Duplex Angal & channel
Duplex Angal & channel
Nickel Angal & channel
Monel K500 Angal & channel
Frequently Asked Questions (FAQ)
What is SS 309 / SS 309S Stainless Steel Angle Channel?
SS 309 / SS 309S Stainless Steel Angle Channel is an austenitic heat-resistant steel profile designed for structural and fabrication applications exposed to high temperatures. It provides excellent oxidation and corrosion resistance with strong mechanical properties suitable for industrial and furnace environments.
What is the difference between SS 309 and SS 309S?
The main difference is carbon content. SS 309S has a lower carbon level than SS 309, which improves weldability and minimizes carbide precipitation during welding. Both offer similar strength and heat resistance, but SS 309S is preferred for welded structures and components exposed to high temperatures.
What are the key applications of SS 309 / 309S Angle Channel?
These stainless steel angle channels are widely used in heat exchangers, furnace components, boiler supports, kilns, exhaust systems, and chemical processing equipment. They are ideal for industries such as petrochemical, power generation, and metal fabrication that demand resistance to oxidation and scaling.
What are the main standards and specifications for SS 309 / SS 309S Angle Channel?
The material conforms to ASTM A276, A479, and A240 specifications for stainless steel shapes and bars. Equivalent UNS designations are S30900 for SS 309 and S30908 for SS 309S. Both grades are supplied in annealed or solution-treated condition with mill test certification.
What are the typical sizes available for SS 309 / 309S Angle Channels?
Common sizes range from 20mm × 20mm up to 150mm × 150mm with thicknesses from 3mm to 12mm. They can be supplied as equal or unequal angle channels, in standard 6-meter lengths or custom-cut dimensions. Surface finishes include mill, pickled, polished, and brushed.
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