When it comes to selecting a material that can withstand extreme heat, oxidation, and thermal cycling, 310S stainless steel 1.4845 (UNS S31008) stands out as one of the most reliable choices. Engineered for high-temperature service, this austenitic stainless steel grade is commonly used in industrial furnaces, heat exchangers, and other equipment exposed to intense thermal environments. Known for its excellent high-temperature strength, oxidation resistance, and corrosion resistance, 310S stainless steel 1.4845 (UNS S31008) is a preferred material in the heat treatment, chemical, and petrochemical industries.
What is 310S Stainless Steel 1.4845 (UNS S31008)?
310S stainless steel 1.4845 (UNS S31008) is a low-carbon version of 310 stainless steel, an austenitic chromium-nickel alloy designed for use in high-temperature environments. The “S” stands for “low carbon,” typically 0.08% or less, which provides improved weldability and reduces the risk of sensitization during thermal cycling.
Its composition typically includes:
- Chromium (Cr): 24–26%
- Nickel (Ni): 19–22%
- Carbon (C): ≤ 0.08%
- Manganese (Mn): ≤ 2.0%
- Silicon (Si): ≤ 1.5%
- Phosphorus (P): ≤ 0.045%
- Sulfur (S): ≤ 0.03%
This high chromium and nickel content enables 310S stainless steel 1.4845 (UNS S31008) to withstand oxidation up to 1100°C (2010°F) in continuous service and up to 1150°C (2100°F) in intermittent service.
Key Properties of 310S Stainless Steel 1.4845 (UNS S31008)
The composition of this alloy delivers a set of unique performance characteristics that are essential for demanding applications:
1. High-Temperature Oxidation Resistance
One of the primary advantages of 310S stainless steel 1.4845 (UNS S31008) is its ability to resist oxidation and scaling in environments reaching up to 1150°C. This makes it suitable for applications involving heat treatment furnaces, kilns, and incinerators.
2. Excellent Strength at Elevated Temperatures
Even under extreme heat, 310S retains its mechanical strength and structural stability, making it ideal for load-bearing applications in thermal environments.
3. Good Resistance to Sulfur Atmospheres
Although not as sulfur-resistant as high-silicon alloys, 310S stainless steel 1.4845 (UNS S31008) performs well in oxidizing sulfur atmospheres, such as in sulfur-bearing gases.
4. Corrosion Resistance
While 310S is specifically designed for high temperatures, it also exhibits good general corrosion resistance in mildly corrosive environments, similar to that of 304 stainless steel.
5. Improved Weldability
Due to its low carbon content, 310S offers better weldability than standard 310, minimizing the risk of carbide precipitation and intergranular corrosion after welding.
Applications of 310S Stainless Steel 1.4845 (UNS S31008)
Given its high-temperature performance, 310S stainless steel 1.4845 (UNS S31008) is commonly used in:
- Furnace components: Retorts, fans, tubes, doors, and burner tips
- Heat exchangers in oil and gas refineries and chemical processing
- Kiln linings and thermocouple sheaths
- Steam boilers and high-temperature piping systems
- Incinerator components
- Radiant tubes in metallurgy
Its resilience against high heat, corrosion, and thermal stress makes it the material of choice for many engineers and designers working with elevated temperature systems.
Mechanical Properties
The typical mechanical properties of 310S stainless steel 1.4845 (UNS S31008) in the annealed condition include:
- Tensile Strength: ≥ 520 MPa
- Yield Strength (0.2% offset): ≥ 205 MPa
- Elongation: ≥ 40%
- Hardness: ≤ 95 HRB
These properties enable the material to handle both static and dynamic stress in challenging thermal applications.
Comparison with Other Stainless Steels
| Grade | Max Temperature (°C) | Corrosion Resistance | Weldability | Applications |
| 304/304L | ~870 | Good | Excellent | General-purpose applications |
| 316/316L | ~925 | Better (chlorides) | Excellent | Marine & chemical processing |
| 310S 1.4845 | ~1150 | Good (high temp) | Very Good | Furnace & high-heat use |
| 321 | ~870 | Good | Good | High-temperature, welded parts |
If your application requires resistance to scaling and oxidation beyond 1000°C, 310S stainless steel 1.4845 (UNS S31008) is the superior choice.
Standards and Availability
310S stainless steel 1.4845 (UNS S31008) is available in various product forms:
- Sheets and Plates
- Seamless and Welded Pipes (ASTM A312)
- Bars and Rods (ASTM A276)
- Flanges and Fittings
It is manufactured to comply with international standards, including:
- ASTM A240 / A312 / A213
- EN 1.4845
- UNS S31008
Products are typically available in mill finish, pickled, or polished surfaces depending on the end-use requirements.
Cost Considerations
Due to its high nickel and chromium content, 310S stainless steel 1.4845 (UNS S31008) is more expensive than grades like 304 or 316. However, its extended lifespan and superior performance in high-heat environments justify the cost, especially when considering reduced downtime, lower maintenance, and longer service life.
Conclusion
For industrial applications that involve extreme heat and demanding performance, 310S stainless steel 1.4845 (UNS S31008) is a robust and cost-effective solution. Its excellent resistance to oxidation, high strength at elevated temperatures, and reliable weldability make it the go-to material for heat treatment, petrochemical, and power generation industries.
Whether you’re building a high-temperature furnace, designing heat exchanger tubes, or fabricating components for incineration plants, choosing 310S stainless steel 1.4845 (UNS S31008) ensures long-term durability and performance under the toughest conditions.