Stainless Steel 310S
Stainless Steel 310S (UNS S31008 / EN 1.4845) – Specifications, Properties and Applications
Stainless Steel 310S (UNS S31008 / EN 1.4845) is the low-carbon version of Stainless Steel 310, specifically engineered for applications requiring exceptional oxidation resistance, superior heat resistance, and excellent weldability. The reduced carbon content minimizes carbide precipitation during welding, significantly improving resistance to intergranular corrosion in welded fabrications.
With its high chromium and nickel content, Stainless Steel 310S offers outstanding resistance to scaling, thermal shock, and oxidation while maintaining excellent mechanical strength at elevated temperatures. It is widely used in industrial furnaces, heat treatment equipment, boilers, heat exchangers, petrochemical plants, refineries, power generation facilities, and thermal processing industries.
Emirerri Steel supplies Stainless Steel 310S in sheets, plates, coils, pipes, tubes, round bars, flanges, and pipe fittings to customers across Tunisia, Algeria, Morocco, Libya, and global markets.
Key Features
- Excellent high-temperature oxidation resistance
- Outstanding heat resistance
- Low carbon content for improved weldability
- Excellent resistance to intergranular corrosion
- Superior scaling resistance
- High chromium and nickel content
- Good creep resistance
- Excellent thermal shock resistance
- Good fabrication characteristics
- Long service life with low maintenance
Stainless Steel 310S Specifications
| Specification | Details |
|---|---|
| Grade | Stainless Steel 310S |
| UNS Number | S31008 |
| Werkstoff Number | 1.4845 |
| EN Designation | X8CrNi25-21 |
| Stainless Steel Family | Austenitic Stainless Steel |
| Standards | ASTM A240, ASTM A276, ASTM A312, ASTM A182, EN 10088 |
| Product Forms | Sheet, Plate, Coil, Pipe, Tube, Round Bar, Flanges, Pipe Fittings |
| Surface Finish | No.1, 2B, BA, No.4, Mirror Finish |
| Supply Condition | Solution Annealed |
Equivalent Grades of Stainless Steel 310S
| Standard | Equivalent Grade |
|---|---|
| ASTM | 310S |
| UNS | S31008 |
| EN | 1.4845 |
| DIN | X8CrNi25-21 |
| JIS | SUS310S |
| ISO | X8CrNi25-21 |
Chemical Composition of Stainless Steel 310S
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 19.0 – 22.0 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.50 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties of Stainless Steel 310S
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HB |
| Modulus of Elasticity | 200 GPa |
Physical Properties of Stainless Steel 310S
| Property | Value |
|---|---|
| Density | 7.90 g/cm³ |
| Melting Range | 1400 – 1450°C |
| Thermal Conductivity | 14.2 W/m·K |
| Electrical Resistivity | 0.78 µΩ·m |
| Specific Heat Capacity | 500 J/kg·K |
| Magnetic Permeability | Essentially Non-Magnetic (Annealed Condition) |
Types of Stainless Steel 310S Products
Stainless Steel 310S Plates
Designed for industrial furnaces, boilers, pressure vessels, and high-temperature equipment.
Stainless Steel 310S Sheets
Suitable for furnace linings, heat shields, thermal insulation systems, and industrial fabrication.
Stainless Steel 310S Pipes
Used in petrochemical plants, refineries, power stations, and high-temperature process piping.
Stainless Steel 310S Tubes
Ideal for heat exchangers, superheaters, condensers, and thermal processing equipment.
Stainless Steel 310S Round Bars
Used in shafts, furnace fixtures, valves, fasteners, and machined components operating at elevated temperatures.
Stainless Steel 310S Flanges & Pipe Fittings
Manufactured for high-temperature piping systems in chemical processing plants, refineries, and power generation industries.
Corrosion Resistance
Stainless Steel 310S provides excellent resistance to:
Atmospheric corrosion
High-temperature oxidation
Oxidizing gases
Organic acids
Industrial atmospheres
Intergranular corrosion after welding
Its low carbon content minimizes carbide precipitation during welding, making Grade 310S particularly suitable for welded fabrications exposed to elevated temperatures. For chloride-rich or marine environments, Stainless Steel 316L or Duplex Stainless Steel generally provides better corrosion resistance.
Heat Resistance
Stainless Steel 310S is specifically designed for continuous service in extremely high-temperature environments.
Service Temperature
Continuous Service: Up to approximately 1100°C
Intermittent Service: Up to approximately 1035°C
Benefits
Outstanding oxidation resistance
Excellent scaling resistance
Superior thermal stability
Good creep resistance
Excellent resistance to thermal cycling
Heat Treatment
Solution Annealing
Temperature: 1040°C – 1150°C
Cooling: Rapid air cooling or water quenching
Benefits
Restores corrosion resistance
Improves ductility
Relieves internal stresses
Optimizes mechanical properties
Stainless Steel 310S cannot be hardened by heat treatment but can be strengthened through cold working.
Welding of Stainless Steel 310S
Grade 310S offers excellent weldability using conventional welding methods.
Recommended Welding Methods
GTAW (TIG)
GMAW (MIG)
SMAW (Shielded Metal Arc Welding)
SAW (Submerged Arc Welding)
Resistance Welding
Welding Advantages
Excellent weld quality
No preheating normally required
Reduced risk of intergranular corrosion
Good resistance to hot cracking
Reliable performance at elevated temperatures
Post-weld cleaning, pickling, and passivation are recommended to restore the protective passive layer and maximize corrosion resistance.
Fabrication of Stainless Steel 310S
Machining
Turning
Milling
Drilling
Threading
Forming
Cold bending
Roll forming
Press forming
Deep drawing
Cutting
Laser cutting
Plasma cutting
Waterjet cutting
Mechanical sawing
Surface Finishing
Pickling
Passivation
Mechanical polishing
Electropolishing
Applications
Furnace Industry
Furnace linings
Burner components
Furnace conveyors
Heat treatment baskets
Petrochemical Industry
Reactors
Process piping
Heat exchangers
Refinery equipment
Power Generation
Boilers
Superheaters
Steam piping
Waste heat recovery systems
Chemical Processing
High-temperature vessels
Storage tanks
Processing equipment
Thermal Processing Industry
Annealing furnaces
Kilns
Combustion chambers
Incinerator components
Industrial Manufacturing
High-temperature machinery
Exhaust systems
Heat-resistant structural components
Conclusion
Stainless Steel 310S (UNS S31008 / EN 1.4845) is a premium low-carbon, heat-resistant austenitic stainless steel developed for demanding high-temperature applications. Its high chromium and nickel content provides exceptional oxidation resistance, excellent thermal stability, and superior resistance to intergranular corrosion after welding. These properties make it an ideal choice for industrial furnaces, heat exchangers, petrochemical plants, refineries, power stations, and thermal processing industries. Available in sheets, plates, pipes, tubes, bars, flanges, and fittings, Stainless Steel 310S delivers dependable long-term performance in the most demanding industrial environments worldwide.