Stainless Steel 321
Stainless Steel 321 (UNS S32100 / EN 1.4541) – Specifications, Properties and Applications
Stainless Steel 321 (UNS S32100 / EN 1.4541) is a titanium-stabilized austenitic stainless steel developed for applications requiring excellent corrosion resistance and reliable performance at elevated temperatures.
The addition of titanium (Ti) stabilizes carbon and helps reduce chromium carbide precipitation during exposure to temperatures in the sensitization range. This makes Stainless Steel 321 particularly suitable for welded components, high-temperature piping, heat exchangers, petrochemical equipment, thermal processing equipment, and applications subject to repeated thermal cycling.
Stainless Steel 321 combines good mechanical strength, excellent weldability, good oxidation resistance, and high-temperature stability. It is widely used in oil & gas, petrochemical, chemical processing, power generation, aerospace, industrial furnaces, and thermal-processing industries.
Emirerri Steel supplies Stainless Steel 321 in sheets, plates, coils, pipes, tubes, round bars, flanges, and pipe fittings for customers across Tunisia, Algeria, Morocco, Libya, and international markets.
Key Features
- Excellent general corrosion resistance
- Titanium-stabilized grade
- Improved resistance to sensitization
- Good intergranular corrosion resistance under appropriate conditions
- Good high-temperature performance
- Good oxidation resistance
- Good creep resistance
- Excellent thermal cycling resistance
- Excellent weldability
- Good ductility
- Good formability
- Good mechanical strength
- Long service life
Specifications
| Specification | Details |
|---|---|
| Grade | Stainless Steel 321 |
| UNS Number | S32100 |
| Werkstoff Number | 1.4541 |
| EN Designation | X6CrNiTi18-10 |
| Stainless Steel Family | Austenitic Stainless Steel |
| Stabilizing Element | Titanium (Ti) |
| Common Standards | ASTM A240, ASTM A276, ASTM A312, ASTM A182, ASTM A213, EN 10088 |
| Supply Condition | Solution Annealed |
| Surface Finishes | No.1, 2B, BA, No.4, Mirror |
| Product Forms | Sheet, Plate, Coil, Pipe, Tube, Round Bar, Flanges, Pipe Fittings |
Equivalent Grades of Stainless Steel 321
| Standard | Equivalent Grade |
|---|---|
| ASTM | 321 |
| UNS | S32100 |
| EN | 1.4541 |
| DIN | X6CrNiTi18-10 |
| JIS | SUS321 |
| ISO | X6CrNiTi18-10 |
Available Sizes
Stainless Steel 321 Sheets & Plates
- Thickness: 0.5 to 100 mm
- Width: Up to 2500 mm
- Length: Up to 12000 mm
Stainless Steel 321 Pipes & Tubes
- Outside Diameter: 6 to 610 mm
- Wall Thickness: 0.5 to 40 mm
Stainless Steel 321 Round Bars
- Diameter: 6 to 500 mm
Actual availability depends on product form, applicable standard, manufacturing method, supply condition, and project requirements.
Stainless Steel 321 Chemical Composition
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C and ≤ 0.70 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
Stainless Steel 321 Mechanical Properties of
Values may vary according to product form and applicable specification.
| Property | Typical Minimum Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HB |
| Modulus of Elasticity | ≈ 193 GPa |
Stainless Steel 321 Physical Properties
| Property | Approximate Value |
|---|---|
| Density | 8.03 g/cm³ |
| Melting Range | ≈ 1400 – 1425°C |
| Thermal Conductivity | ≈ 16 W/m·K |
| Specific Heat Capacity | ≈ 500 J/kg·K |
| Magnetic Permeability | Low in Annealed Condition |
Types of Stainless Steel 321 Products
Stainless Steel 321 Sheets & Plates
Used for thermal equipment, pressure vessels, furnace components, heat shields, and industrial fabrication.
Stainless Steel 321 Pipes & Tubes
Suitable for high-temperature process piping, petrochemical plants, thermal systems, and industrial fluid-handling applications.
Stainless Steel 321 Heat Exchanger Tubes
Used in heat exchangers, boilers, condensers, and heat-recovery systems.
Stainless Steel 321 Round Bars
Used for shafts, fasteners, machined components, mechanical parts, and components exposed to elevated temperatures.
Stainless Steel 321 Flanges & Pipe Fittings
Designed for piping systems exposed to elevated temperatures and corrosive process environments.
Corrosion Resistance
Stainless Steel 321 provides good to excellent corrosion resistance in many industrial environments.
It offers resistance to:
- General atmospheric corrosion
- Oxidation
- Many industrial environments
- Intergranular corrosion under appropriate thermal conditions
- Thermal cycling
- Selected chemical environments
The titanium stabilization is particularly beneficial when the material is exposed to temperatures that could cause sensitization.
However, Stainless Steel 321 generally does not provide the same chloride pitting resistance as molybdenum-bearing grades such as 316L.
For strongly chloride-containing environments, the application should therefore be evaluated carefully before selecting 321.
Heat Resistance
High-temperature performance is one of the major advantages of Stainless Steel 321.
It offers:
- Good oxidation resistance
- Good metallurgical stability
- Good creep resistance
- Good thermal fatigue resistance
- Good resistance to repeated heating and cooling cycles
Stainless Steel 321 is commonly selected for applications operating at temperatures above those normally preferred for standard 304/304L stainless steel.
For prolonged exposure to extremely high temperatures and severe oxidizing environments, specialized heat-resistant grades such as Stainless Steel 310S may be more appropriate.
Heat Treatment
Solution Annealing
- Temperature: Generally 1050 – 1150°C
- Cooling: Rapid cooling according to the applicable product specification
Objectives
- Dissolve unwanted precipitates
- Homogenize the microstructure
- Improve ductility
- Optimize corrosion resistance
- Reduce internal stresses
Stainless Steel 321 cannot be hardened by conventional heat treatment. It can, however, be strengthened through cold working.
Welding of Stainless Steel 321
Stainless Steel 321 has excellent weldability and can be welded using conventional industrial processes.
Recommended Welding Methods
- GTAW / TIG
- GMAW / MIG
- SMAW
- SAW
- Orbital Welding
- Resistance Welding
Welding Advantages
- Excellent weldability
- Good metallurgical stability
- Good corrosion resistance after welding
- Good high-temperature performance
- Reduced risk of sensitization under appropriate conditions
The titanium stabilization helps reduce the risk of chromium carbide precipitation during appropriate thermal exposure.
Post-weld cleaning, pickling, and passivation may be required depending on the service environment and project specifications.
Fabrication of Stainless Steel 321
Machining
- Turning
- Milling
- Drilling
- Threading
Stainless Steel 321 can work-harden during machining. Proper tooling, cutting parameters, and cooling practices should therefore be used.
Forming
- Cold bending
- Roll forming
- Press forming
- Deep drawing
- Cold forming
Cutting
- Laser cutting
- Plasma cutting
- Waterjet cutting
- Mechanical sawing
Surface Finishing
- Pickling
- Passivation
- Mechanical polishing
- Electropolishing
- Brushing
Applications of Stainless Steel 321
Oil & Gas Industry
- High-temperature piping
- Refinery equipment
- Process equipment
- Thermal components
Petrochemical Industry
- Process piping
- Heat exchangers
- Heating systems
- High-temperature process equipment
Chemical Industry
- Chemical tanks
- Reactors
- Process piping
- Thermal-processing equipment
Power Generation
- Boilers
- Heat exchangers
- Steam systems
- High-temperature components
Aerospace Industry
- Engine components
- Exhaust systems
- High-temperature structural components
- Thermal equipment
Industrial Furnaces & Heat Treatment
- Furnace components
- Supports
- Heat shields
- Conveyors
- Thermal-processing equipment
Stainless Steel 321 for Tunisia, Algeria, Morocco & Libya
Stainless Steel 321 is well suited to industrial projects across Tunisia, Algeria, Morocco, and Libya requiring a combination of corrosion resistance, weldability, and high-temperature performance.
It can be used in oil & gas, petrochemical, chemical processing, power generation, thermal treatment, aerospace, refinery, and industrial process applications.
For projects in North Africa, material selection should consider the actual operating temperature, pressure, process fluid, atmosphere, thermal cycling, chloride exposure, fabrication method, and applicable project standards.
Conclusion
Stainless Steel 321 (UNS S32100 / EN 1.4541) is a titanium-stabilized austenitic stainless steel offering an excellent combination of corrosion resistance, high-temperature stability, thermal cycling resistance, mechanical strength, and weldability.
Its titanium stabilization makes it particularly suitable for welded components and equipment exposed to elevated temperatures where resistance to sensitization is important.
Available in sheets, plates, pipes, tubes, round bars, flanges, and pipe fittings, Stainless Steel 321 is a reliable material for demanding applications in the oil & gas, petrochemical, chemical, power generation, aerospace, furnace, and thermal-processing industries across Tunisia, Algeria, Morocco, Libya, and international markets.
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