Stainless Steel - Grade 310 / 1.4845
Description
Stainless Steel Grade 310/ 1.4845, also known as UNS S31000, is an austenitic heat-resistant alloy characterized by its high chromium and nickel content. It is designed for high-temperature applications and exhibits excellent oxidation resistance at temperatures up to 2010°F (1100°C). This alloy is particularly effective in mildly cyclic conditions and is resistant to sulfidation, making it suitable for various industrial applications.
Chemical Composition
The chemical composition of Grade 310 is as follows:
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 24.0 - 26.0 |
| Nickel (Ni) | 19.2 - 22.0 |
| Carbon (C) | 0.25 Max |
| Silicon (Si) | 1.50 Max |
| Manganese (Mn) | 2.00 Max |
| Phosphorus (P) | 0.045 Max |
| Sulfur (S) | 0.03 Max |
| Molybdenum (Mo) | 0.75 Max |
| Copper (Cu) | 0.50 Max |
| Iron (Fe) | Balance |
Mechanical Properties
The mechanical properties of Grade 310 at room temperature are summarized below:
| Property | Value |
|---|---|
| Ultimate Tensile Strength | 80.0 ksi |
| Yield Strength (0.2% offset) | 35.0 ksi |
| Elongation | 52% |
At elevated temperatures, the properties vary:
| Temperature (°F) | Ultimate Tensile Strength (ksi) | Yield Strength (ksi) | Elongation (%) |
|---|---|---|---|
| 1000 | 67.8 | 20.8 | 47 |
| 1200 | 54.1 | 20.7 | 43 |
| 1600 | 19.1 | 12.2 | 48 |
Thermal & Physical Properties
- Density:Approximately 0.29 lb/in³ (8.0 g/cm³)
- Thermal Conductivity: 16.2 BTU•in/(hr•ft²•°F) (23.4 W/(m•K))
- Specific Heat: 0.11 BTU/(lb•°F) (0.46 kJ/(kg•K))
- Melting Point: Approximately 2550°F (1400°C)
Other Designations
- UNS: S31000
- ASTM: A240, A276, A312
- DIN: 1.4845
Fabrication and Heat Treatment
Grade 310 can be easily welded and fabricated using standard procedures.
- Hot Forming: Heat uniformly to 1742 – 2192°F (950 – 1200°C). After hot forming, a final anneal at 1832 – 2101°F (1000 – 1150°C) followed by rapid quenching is recommended.
- Cold Forming: The alloy is ductile and forms similarly to Type 316. However, cold forming of pieces with long-term exposure to high temperatures is not recommended due to potential carbide precipitation.
- Welding: Suitable for all common welding processes, including TIG, MIG, and SMAW.
Applications
Stainless Steel Grade 310/ 1.4845 is used in various applications, including:
- Kilns and furnaces
- Heat exchangers
- Food processing equipment
- Cryogenic components
- Chemical processing equipment
- Oil and gas applications
Supplied Forms
Grade 310 is available in various forms, including:
- Bar
- Fittings (elbows, tees, etc.)
- Weld wire
Features
- High oxidation resistance up to 2010°F (1100°C)
- Good mechanical strength at elevated temperatures
- Excellent toughness at cryogenic temperatures
- Low magnetic permeability
This datasheet provides a comprehensive overview of Stainless Steel Grade 310, highlighting its properties, applications, and fabrication methods.