Introduction
When you’re designing components for high-temperature service, few materials can match the performance of 310S stainless steel. This austenitic grade is specifically formulated to withstand continuous exposure to temperatures up to 2000°F (1093°C) without significant scaling or loss of strength. In this article, I’ll cover the maximum temperature resistance of 310S, its chemical composition, mechanical properties at elevated temperatures, and how to machine it for high-temperature applications.
Chemical Composition
310S is a high-chromium, high-nickel austenitic stainless steel. The ‘S’ suffix indicates a low-carbon version (0.08% max) to improve weldability and reduce sensitization. Here’s the typical composition per ASTM A240:
| Element | Composition Range (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.50 max |
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 19.0 – 22.0 |
| Molybdenum (Mo) | 0.75 max |
| Nitrogen (N) | 0.10 max |
The high chromium content (24-26%) provides excellent oxidation resistance by forming a stable, adherent chromium oxide scale. The high nickel content (19-22%) stabilizes the austenitic structure and contributes to high-temperature strength and creep resistance.
Maximum Temperature Resistance
310S is rated for continuous service up to 2000°F (1093°C) in oxidizing atmospheres. For intermittent service, it can withstand temperatures up to 2100°F (1149°C). However, the actual maximum temperature depends on the specific environment:
| Service Condition | Maximum Temperature | Notes |
|---|---|---|
| Continuous (oxidizing) | 2000°F (1093°C) | Minimal scaling; good oxidation resistance |
| Intermittent (oxidizing) | 2100°F (1149°C) | Some scaling may occur; acceptable for short cycles |
| Continuous (reducing) | 1800°F (982°C) | Reduced oxidation resistance in low-oxygen environments |
| Continuous (sulfidizing) | 1600°F (871°C) | Sulfur attack can occur; consider 310S with higher silicon |
| Continuous (carburizing) | 1700°F (927°C) | Carbon absorption may reduce ductility over time |
Above 2000°F, the oxide scale may begin to spall, and creep strength decreases significantly. For sustained service above 2000°F, consider nickel-based superalloys like Inconel 600 or 601.
Mechanical Properties at Elevated Temperatures
310S retains significant strength at high temperatures. Here are typical tensile and yield strength values at various temperatures:
| Temperature (°F) | Tensile Strength (ksi) | Yield Strength (0.2%, ksi) | Elongation (%) |
|---|---|---|---|
| Room | 85 – 100 | 35 – 45 | 40 – 50 |
| 1000 | 60 – 75 | 20 – 30 | 35 – 45 |
| 1200 | 50 – 65 | 18 – 25 | 30 – 40 |
| 1400 | 40 – 55 | 15 – 22 | 25 – 35 |
| 1600 | 30 – 45 | 12 – 18 | 20 – 30 |
| 1800 | 20 – 35 | 8 – 15 | 15 – 25 |
| 2000 | 15 – 25 | 5 – 10 | 10 – 20 |
Creep strength is also important for long-term service. At 1600°F, the 10,000-hour creep rupture strength is approximately 5-8 ksi. Always consult the material supplier for specific design data.
Typical Applications
310S is found in the hottest parts of industrial processes. Common applications include:
- Furnace components – Radiant tubes, muffles, retorts, and conveyor belts.
- Heat treatment fixtures – Baskets, trays, and fixtures for annealing, hardening, and brazing.
- Chemical processing – Reactors and piping for high-temperature sulfuric acid and nitric acid.
- Power generation – Superheater tubes and boiler components.
- Waste incineration – Combustion chamber liners and afterburner components.
CNC Machining Guide
310S is tough to machine. Its high strength and work-hardening rate demand robust tooling and conservative parameters. Here are my recommendations:
| Operation | Tool Material | Speed (SFM) | Feed (IPR) | Depth of Cut (in) |
|---|---|---|---|---|
| Turning (rough) | Carbide (C2 grade, TiAlN coated) | 150 – 250 | 0.008 – 0.015 | 0.060 – 0.120 |
| Turning (finish) | Carbide (C2 grade, TiAlN coated) | 200 – 350 | 0.003 – 0.006 | 0.010 – 0.030 |
| Milling (rough) | Carbide (TiAlN coated) | 120 – 200 | 0.003 – 0.005 (IPT) | 0.030 – 0.080 |
| Milling (finish) | Carbide (TiAlN coated) | 180 – 280 | 0.002 – 0.004 (IPT) | 0.010 – 0.020 |
| Drilling | Carbide (with coolant-through) | 80 – 150 | 0.002 – 0.004 | N/A |
Critical considerations: Use rigid setups and minimize overhang. High-pressure coolant (1000+ psi) is essential for chip control and heat dissipation. Avoid interrupted cuts if possible. For threading, use single-point threading with multiple passes to reduce tool load.
Quality Control
At Dongguan Stirling Metal Products Co., Ltd., we ensure your 310S parts are ready for the heat. Our QC includes:
- PMI verification – XRF confirmation of chromium (24-26%) and nickel (19-22%) content.
- High-temperature tensile testing – Verification of strength at specified service temperatures.
- Dimensional inspection – CMM and thermal expansion compensation for hot-fit tolerances.
- Surface condition – Visual and dye penetrant inspection for cracks or defects.
Conclusion
310S stainless steel is the go-to material for high-temperature applications up to 2000°F. Its high chromium and nickel content provide excellent oxidation resistance and strength retention. While machining it requires careful parameter selection, the performance in service is unmatched. If you need components that can take the heat, 310S is your material.
Dongguan Stirling Metal Products Co., Ltd. specializes in providing a One-Stop Service for 310S material + CNC machining:
- ✅ Material procurement: Genuine product guarantee, complete material certificates
- ✅ CNC machining: Precision of ±0.01mm, smooth surface finish
- ✅ Sample production: Fast delivery within 3-5 days
- ✅ Batch production: Delivery within 7-15 days
For a Free Quote, feel free to contact us!
Turn this machining question into a manufacturable part
Need this material or process for your next CNC project?
Send your STEP, STP, IGES, DXF, PDF, material, quantity, surface finish, and tolerance requirements. We will review manufacturability and reply with practical quotation guidance.
