310S Stainless Steel Round Bar | High-Temperature Champion for Extreme Environments
✓ Extreme Heat Endurance: Continuous service up to 1,150°C (2,102°F) with oxidation resistance 3x greater than 309S.
✓ Thermal Cycling Stability: Low carbon content (≤0.08%) prevents carbide precipitation, retaining ductility through 10,000+ heating/cooling cycles.
✓ Corrosion Defense: Resists sulfidation, carburization, and metal dusting in hydrocarbon processing (validated by NACE TM0112).
✓ Fabrication Flexibility: Brinell hardness ≤207 HBW, compatible with hot forming and welding (AWS A5.9 ER310 filler recommended).
310S Stainless Steel Round Bar (UNS S31008)
Engineered to excel in extreme thermal conditions, 310S stainless steel round bar delivers unmatched oxidation resistance and creep strength at temperatures up to 1,150°C (2,102°F). With a high chromium-nickel composition (25% Cr, 20% Ni), this austenitic alloy forms a self-healing oxide layer, outperforming conventional grades in furnace components, heat treatment fixtures, and aerospace systems. Certified to ASTM A276/A479 and ASME BPVC Section II, it is the ultimate choice for applications demanding durability under relentless thermal cycling.
- Diameter Range: 5mm–300mm (hot-rolled ±0.5%; cold-drawn ±0.05mm)
- Length: 1m–6m standard (cut-to-length precision ±1mm)
- Surface Finishes: Hot Rolled, Peeled, Polished (Ra ≤0.8μm), or Shot Blasted (SA 2.5)
- Mechanical Properties: Yield Strength ≥205 MPa | Tensile Strength ≥515 MPa | Elongation ≥40%
| Parameter Category | Value/Description |
|---|---|
| Material Grade | UNS S31008 (per ASTM A276) |
| Composition (%) | C≤0.08, Cr 24.0-26.0, Ni 19.0-22.0, Mn≤2.0, Si≤1.5, P≤0.045, S≤0.03 |
| Tensile Strength (MPa) | ≥515 (Annealed) |
| Yield Strength (MPa) | ≥205 (Annealed) |
| Elongation (%) | ≥40 (50mm gauge length) |
| Hardness | Brinell (HB): ≤201; Rockwell (HRB): ≤92 (Annealed) |
| Density (g/cm³) | 8.00 |
| Melting Range | 1400-1450℃ |
| Thermal Conductivity (W/m·K) | 14.2 (20℃) |
| Thermal Expansion (10⁻⁶/℃) | 16.5 (20-100℃) |
| Electrical Resistivity (Ω·m) | 0.78×10⁻⁶ (20℃) |
| Elastic Modulus (GPa) | 200 |
| Magnetic Properties | Non-magnetic (Annealed) |
| Corrosion Resistance | Superior oxidation resistance (up to 1100℃), resistance to sulfidation, hot acidic environments, and molten salts |
| Heat Treatment | Annealing: 1040-1120℃ followed by rapid cooling (water or air quenching) |
| Surface Finishes | Black (Hot-rolled), Turned, Polished, Pickling & Passivation |
| Dimension Range | Diameter: 5mm-300mm; Length: 3000mm/6000mm (standard) |
| Standards | ASTM A276/A479, EN 10095, JIS G4311, GB/T 1220 |
| Applications | High-temperature furnace tubes, heat treatment furnace linings, burner components, petrochemical cracking furnaces, thermocouple protection tubes |
310S Stainless Steel Round Bar Applications
| Industry | Critical Components | 310S Round Bar Advantage |
|---|---|---|
| Petrochemical | Ethylene cracking tubes, reformer furnace internals | Resists metal dusting at 600°C (1,112°F) in syngas environments. |
| Heat Treatment | Annealing trays, carburizing fixtures | 10,000+ thermal cycles lifespan at 1,100°C (2,012°F). |
| Power Generation | Boiler combustion chambers, superheater tubes | Withstands 25MPa stress rupture strength at 650°C (1,202°F). |
| Aerospace | Jet engine combustion liners, afterburner rings | Optimized CTE (16.5 µm/m°C) for thermal shock resistance. |
310S Stainless Steel Round Bar Product Packaging
310S Stainless Steel Round Bar are precision-engineered for superior corrosion resistance and mechanical strength, meeting ASTM A276 and ISO 3506 standards. To ensure optimal performance from factory to your facility, we implement rigorous packaging protocols and logistics safeguards.
Small Bars (<50mm)
Bundled with steel straps + VCI-coated wraps, crated on reinforced wooden pallets.
Large Bars (≥50mm)
End caps + edge protectors, stacked in custom steel racks with desiccant units.
Anti-Scratch Sleeving
Silicone-impregnated fabric for polished/ground surfaces.
RFID Tags
Embedded tracking chips with real-time material certification access.
Why Choose Us
Where Precision Meets Partnership，25 years of focus on metal material science，Not only a supplier, but also your engineering consultant，Fast and zero compromise，Sustainable trust cycle。
Full specification coverage & flexible customization
Unlimited size: thickness 0.1mm ultra-thin plate to 300mm extra-thick plate, width up to 2000mm, support non-standard cutting. Various surface treatments: 2B, BA mirror, brushed (No.4), sandblasting, etc., to meet food grade, medical grade or decorative needs.
Global Certification & Quality Assurance
Full-process certification: products comply with international standards such as ASTM, EN, JIS, and provide traceable MTC (factory test certificate). Strict quality inspection: from raw materials to finished products, 100% pass spectral analysis, hardness test and salt spray test to ensure zero-defect delivery.
Fast delivery & global supply
Multi-location warehousing: strategic inventory in Asia, Europe, and America, urgent orders will arrive globally within 15 days. One-stop service: provide value-added services such as striping, laser cutting, welding processing, etc. to shorten customer production cycle.
Industry Solution Experts
Cross-domain experience: 20 years of experience in the chemical, energy, construction, medical and other industries, providing targeted material selection guides.
Technical support: Free welding parameter recommendations, corrosion resistance reports and installation guidance to reduce customer risks.
Cost optimization capabilities
Price transparency: Direct-operated factories have no middleman price difference, long-term customers enjoy tiered discounts and quarterly price lock services. Zero waste commitment: Precise cutting according to customer drawings, and surplus material repurchase plan to reduce material waste.
Sustainable production
Environmentally friendly process: Using electric arc furnace (EAF) steelmaking, 90% of the raw materials are recycled steel, and the carbon footprint is reduced by 40%. Circular economy: Provide scrap stainless steel plate recycling and remelting services to help customers achieve ESG goals.
310S Stainless Steel Round Bar Shipping
Sea transport
40HQ container (loading capacity 28 tons) / bulk carrier (LCL minimum 1 ton)
Air transport
reach major airports around the world within 7 days (DDP/DAP terms)
Land transport
door-to-door within China (qualification for dangerous goods transportation)
Our Services
We guarantee global door-to-door delivery within 7–15 business days via partnerships with DHL, Maersk, and UPS.
FAQ
Q1: How does 310S compare to Inconel 601 in high-temperature service?
A: 310S offers comparable oxidation resistance up to 1,100°C (2,012°F) at 60% lower cost. Switch to Inconel only above 1,200°C (2,192°F) or for extreme sulfur environments.
Q2: What welding techniques are recommended?
A: Use GTAW with ER310 filler, preheating to 150-200°C (302-392°F) for thickness >6mm. Post-weld heat treatment not required for most applications.
Q3: How to minimize scale formation during hot forming?
A: Specify our Pre-Oxidized Finish – pre-stabilized oxide layer reduces post-processing scaling by 90%.
Q4: What certifications support nuclear industry use?
All bars include:
- ASME Section III (NPCA) compliance
- EN 10204 3.1 Certificate with PMI
- ISO 9712 NDT reports (UT/RT/PT)
Q5: What’s the lead time for custom heat-treated orders?
Solution-annealed bars: 20 days (min. 5 tons).
Quenched & tempered orders: 35 days (min. 10 tons).
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