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SS 321 / SS 321H Stainless Steel Angle Channel is a titanium-stabilized austenitic stainless steel product known for its excellent resistance to intergranular corrosion. These channels are widely used in high-temperature applications due to their superior oxidation and creep strength. The titanium addition prevents carbide precipitation during welding, ensuring long-term stability in challenging environments. SS 321 and SS 321H grades are designed to maintain mechanical strength and structural integrity under continuous service at elevated temperatures.
Both SS 321 and SS 321H Angle Channels are ideal for structural and fabrication purposes in industries that demand durability and corrosion resistance. The “H” grade (321H) has higher carbon content, providing enhanced creep resistance and better high-temperature strength. These channels are manufactured through advanced hot-rolled and cold-rolled processes to achieve precise dimensions and superior surface finish. They are suitable for applications where exposure to heat and oxidizing agents is frequent.
The SS 321 / 321H Stainless Steel Angle Channel offers exceptional weldability and formability, allowing easy fabrication into various structural frameworks. The material’s resistance to scaling up to 870°C makes it an excellent choice for heat exchangers, furnace components, and exhaust manifolds. Additionally, the titanium stabilization ensures that the alloy remains free from sensitization, preventing grain boundary corrosion even after prolonged heating cycles. This makes it a trusted material in both industrial and architectural uses.
In chemical processing industries, SS 321 / 321H Angle Channels perform efficiently under exposure to organic acids, petroleum products, and high-temperature steam. Their ability to resist oxidation and maintain strength makes them a preferred option in refineries, power plants, and thermal processing units. Moreover, the alloy’s combination of toughness and ductility allows it to perform well in both cryogenic and elevated temperature ranges. This versatility gives it a distinct edge over conventional stainless grades.
The mechanical strength of SS 321 / SS 321H Angle Channels is complemented by their high tensile and yield properties, which ensure reliability in load-bearing frameworks. These channels are commonly used in support structures, brackets, frames, conveyors, and architectural installations. They exhibit minimal distortion during welding or machining, enabling precise and consistent construction performance. Their long service life reduces maintenance needs, contributing to cost efficiency and sustainability.
SS 321 / 321H Stainless Steel Angle Channels are available in various sizes, thicknesses, and dimensions to cater to different industrial specifications. They can be custom-fabricated to meet specific project requirements while adhering to ASTM, ASME, and DIN standards. With their smooth finish, resistance to pitting and stress corrosion cracking, and robust strength, they are widely utilized in marine, chemical, and thermal equipment manufacturing sectors. Their excellent dimensional accuracy ensures easy installation and uniform load distribution.
In summary, SS 321 / SS 321H Stainless Steel Angle Channels combine strength, stability, and corrosion resistance, making them a top choice for both structural and high-temperature applications. Their superior metallurgical composition allows them to withstand harsh working conditions and maintain mechanical integrity. Whether in refinery piping systems, industrial furnaces, or architectural frameworks, these stainless steel channels offer unmatched reliability. Investing in SS 321 / 321H Angle Channels ensures performance, durability, and long-term operational efficiency.
Specification Table
| SS 321 / SS 321H Stainless Steel Angle Channel – Specification Table | |
|---|---|
| Grade | SS 321 / SS 321H |
| Standard | ASTM A276, A479 / ASME SA276, SA479 |
| Type | Hot Rolled, Cold Rolled, Annealed, Pickled |
| Material Form | Angle, Channel, Flat Bar, Equal & Unequal Angle |
| Size Range | 25mm x 25mm to 200mm x 200mm (Angle) / 75mm to 400mm (Channel) |
| Thickness | 3mm to 20mm |
| Length | Up to 6 Meters (Custom Lengths Available) |
| Surface Finish | 2B, No.1, No.4, Bright Annealed, Polished |
| Manufacturing Process | Hot Rolled / Cold Formed |
| Applications | Heat Exchangers, Furnace Parts, Exhaust Systems, Chemical Plants, Structural Frames |
Chemical Composition (Typical ranges for SSIS)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| SS 321 / SS 321H Stainless Steel Angle Channel – Chemical Composition | ||
|---|---|---|
| Element | SS 321 (%) | SS 321H (%) |
| Carbon (C) | ≤ 0.08 | 0.04 – 0.10 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Nickel (Ni) | 9.0 – 12.0 | 9.0 – 12.0 |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 |
| Titanium (Ti) | ≥ 5 × C up to 0.70 | ≥ 4 × C up to 0.70 |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| SS 321 / SS 321H Stainless Steel Angle Channel – Mechanical Properties | ||
|---|---|---|
| Property | SS 321 | SS 321H |
| Tensile Strength (MPa) | 515 – 750 | 515 – 750 |
| Yield Strength (0.2% Proof) (MPa) | 205 Min | 205 Min |
| Elongation (% in 50mm) | 40 Min | 40 Min |
| Hardness (Brinell HB) | ≤ 217 | ≤ 217 |
| Density (g/cm³) | 7.92 | 7.92 |
| Melting Point (°C) | 1398 – 1446 | 1398 – 1446 |
| Modulus of Elasticity (GPa) | 193 | 193 |
Equivalent Grades
| SS 321 / SS 321H Stainless Steel Angle Channel – Equivalent Grades | ||||
|---|---|---|---|---|
| STANDARD | SS 321 | SS 321H | WERKSTOFF NR. | UNS |
| ASTM / ASME | 321 | 321H | 1.4541 / 1.4878 | S32100 / S32109 |
| EN | X6CrNiTi18-10 | X6CrNiTi18-10 (H) | 1.4541 / 1.4878 | — |
| JIS | SUS 321 | SUS 321H | — | — |
| BS | 321S31 | 321S51 | — | — |
| GOST | 08Х18Н10Т | 08Х18Н10Т (H) | — | — |
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.
| SS 321 / SS 321H Stainless Steel Angle Channel – Dimension & Weight Chart | ||||
|---|---|---|---|---|
| Size (mm) | Thickness (mm) | Sectional Area (cm²) | Weight (kg/m) | Approx. Weight (kg/ft) |
| 25 x 25 | 3 | 1.44 | 1.13 | 0.34 |
| 40 x 40 | 4 | 3.02 | 2.37 | 0.72 |
| 50 x 50 | 5 | 4.75 | 3.73 | 1.14 |
| 65 x 65 | 6 | 6.98 | 5.48 | 1.67 |
| 75 x 75 | 6 | 8.09 | 6.36 | 1.94 |
| 90 x 90 | 8 | 12.16 | 9.55 | 2.91 |
| 100 x 100 | 8 | 13.62 | 10.70 | 3.26 |
| 130 x 130 | 10 | 22.25 | 17.45 | 5.32 |
| 150 x 150 | 12 | 32.10 | 25.20 | 7.68 |
| 200 x 200 | 15 | 52.50 | 41.20 | 12.56 |
Types of SS 321/321H 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 321 / SS 321H Stainless Steel Angle Channel?
SS 321 / SS 321H Stainless Steel Angle Channel is a titanium-stabilized austenitic stainless steel product designed for high-temperature and corrosion-resistant applications. The titanium addition prevents carbide precipitation, while the higher carbon content in 321H provides improved strength at elevated temperatures.
What is the difference between SS 321 and SS 321H?
The main difference lies in carbon content. SS 321 contains a maximum of 0.08% carbon, while SS 321H has between 0.04% and 0.10%. This higher carbon content in 321H enhances its high-temperature strength and creep resistance, making it ideal for continuous service in heat-intensive environments.
Where are SS 321 / 321H Angle Channels commonly used?
They are widely used in heat exchangers, chemical processing plants, furnace parts, exhaust systems, pressure vessels, and architectural structures. Their excellent resistance to oxidation and intergranular corrosion makes them perfect for high-temperature and corrosive applications.
What are the key benefits of SS 321 / SS 321H Angle Channels?
Key benefits include superior high-temperature strength, excellent weldability, resistance to scaling and corrosion, and durability under continuous service conditions. They also maintain mechanical stability and toughness even after prolonged heat exposure.
Are SS 321 / SS 321H Angle Channels suitable for welding and fabrication?
Yes. These stainless steels exhibit excellent weldability using conventional welding methods. The titanium stabilization prevents carbide precipitation, eliminating the risk of intergranular corrosion during or after welding. They can also be easily formed and machined.
What are the available sizes and finishes of SS 321 / SS 321H Angle Channels?
They are available in sizes ranging from 25mm to 200mm, with thicknesses between 3mm to 20mm. Common finishes include No.1, 2B, No.4, Bright Annealed, and Polished, depending on application requirements and surface appearance preferences.
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