UNS S35315 redefines thermal endurance with its silicon-augmented austenitic stainless steel matrix, engineered to withstand continuous operation at 1,150°C—surpassing conventional stainless grades by 200°C. Its proprietary Cr-Si-Mn-N alloy design forms a self-repairing SiO₂-rich oxide layer, outperforming 309S and 314 in carburization, sulfidation, and cyclic oxidation resistance for next-gen emission control and heat treatment systems.
UNS S35315 redefines thermal endurance with its silicon-augmented austenitic stainless steel matrix, engineered to withstand continuous operation at 1.150°C—surpassing conventional stainless grades by 200°C. Its proprietary Cr-Si-Mn-N alloy design forms a self-repairing SiO₂-rich oxide layer, outperforming 309S and 314 in carburization, sulfidation, and cyclic oxidation resistance for next-gen emission control and heat treatment systems.
Global Certifications & Industry Approvals
| Standard | Code | Specialty Compliance |
|---|---|---|
| ASTM A276/A959 | S35315 | ASME Boiler Code Case 2728 |
| EN 10088-3 | 1.4835 | Euro 7 Automotive Exhaust Certification |
| JIS G4311 | SUH353 | Japanese Industrial Furnace Standard |
| AMS 5536 Rev. D | - | Aerospace Heat Exchanger Approval |
| TUV Rheinland | FD 563 | Hydrogen Combustion Chamber Compliance |
Material Intelligence
Elemental Synergy
| Component | Role |
|---|---|
| Silicon (1.4–2.0%) | Forms glassy SiO₂ barrier against carburizing gases |
| Chromium (20–22%) | Base oxidation resistance up to 1.000°C |
| Nitrogen (0.15–0.25%) | Stabilizes austenite, enhances creep strength |
| Cerium (0.05–0.15%) | Refines oxide scale adhesion in cyclic heating |
Thermal Mastery
Maximum Service Temp: 1.150°C (Continuous) / 1.300°C (Intermittent)
Thermal Expansion: 18.5 μm/m·K (20–1.000°C) – 15% lower than 309S
Thermal Fatigue: Survives 5.000+ cycles (ΔT=800°C) without crack propagation
Performance Benchmark
| Challenge | S35315 Solution | Validation |
|---|---|---|
| Carburizing Atmospheres | <0.1 mm/year penetration in 1.050°C C₃H₈ | ASTM G79 Method B |
| Sulfur Attack | 0.02 mm/yr loss in 2% H₂S @ 900°C | NACE TM0177-2016 |
| Hot Strength | 120 MPa creep rupture (1.000°C/10.000h) | ISO 204:2018 |
| Formability | 45% elongation at 800°C (hot forging) | Automotive bellows production proven |
5 Industrial Breakthroughs
Emission Control Evolution
Enables ultra-thin 0.8mm exhaust manifolds (Euro 7 compliance) vs. 1.5mm for 309S.
Hydrogen Combustion Ready
Zero hydrogen embrittlement at 850°C/50 bar H₂ (SAE J2579 validated).
Waste Heat Recovery
92% thermal efficiency in 1.000°C exhaust gas recuperators.
Chemical Resistance
Withstands molten nitrate salts (Solar Salt CSP systems).
Cost-Effective Alternative
30% lower lifecycle cost vs. nickel-based alloys in furnace fixtures.
Cross-Sector Innovation
| Industry | Transformative Applications |
|---|---|
| Automotive | Turbocharger housings, SCR catalyst cans |
| Energy Generation | Biomass boiler tubes, hydrogen burner nozzles |
| Metal Processing | Annealing furnace rollers, galvanizing pots |
| Chemical | Pyrolysis reactors, sulfur recovery units |
| Aerospace | Afterburner components, CMC manufacturing tools |
Technical Expertise Center
Q1: Welding procedure for exhaust systems?
A: Use ER353 filler with pulsed GTAW; post-weld heat treat at 1.050°C/1h for oxide layer regeneration.
Q2: Surface treatment for cyclic heating?
A: Laser-shock peening (LSP) improves thermal fatigue life by 40% (SAE AMS 2546 compliant).
Q3: Comparison to Alloy 800H?
A: S35315 offers 20% better oxidation resistance above 900°C but lower nickel content (cost advantage).
Q4: Cold-forming limitations?
A: Achieve 25% cold reduction without cracking; anneal at 1.100°C for severe forming.
Q5: Traceability for automotive?
A: Full IATF 16949 compliance with digital twin metallurgical reports.
Strategic Procurement Benefits
Automotive-Grade Supply
AI-controlled rolling for ±0.02mm thickness tolerance.
Global Stock Network
Immediate access to 0.5–25mm thickness in Detroit, Stuttgart, and Shanghai hubs.
Value-Added Services
Hot-rolled pickling, vacuum annealed finish, custom slitting.
Keywords: UNS S35315. Silicon-Enhanced Stainless Steel, Automotive Exhaust Alloy, High-Temperature Oxidation Resistant, Alloy 353MA Equivalent.
Common Surfaces
Stainless Steel Standards Comparison Table
| STS | USA | UNS | CHINA | EURONORM | RUSSIA | SWEDISH | JAPANESE | |
|---|---|---|---|---|---|---|---|---|
| GRADE | AISI/ASTM | NO | GB | NO | NAME | GOST | SS | JIS |
| 201 | 201 | S20100 | 12Cr17Mn6Ni5N | 1.4372 | - | - | - | SUS 201 |
| 301 | 301 | S30100 | 12Cr17Ni7 | 1.4310 | X 12 CrNi 17 7 | - | 2331 | SUS 301 |
| 303 | 303 | S30300 | 1Cr18Ni9MoZr | 1.4305 | X 10 CrNiS 18 9 | - | 2346 | SUS 303 |
| 304 | 304 | S30400 | 06Cr18Ni9 | 1.4301 | X 6 CrNi 18 10 | 08KH18N10 06KH18N11 |
2332 | SUS 304 |
| 304L | 304L | S30403 | 022Cr19Ni10 | 1.4307 | X 3 CrNi 18 10 | 03KH18N11 | 2352 | SUS 304L |
| 316 | 316 | S31600 | 0Cr17Ni12Mo2 | 1.4401 | X 6 CrNiMo 17 12 2 | - | 2347 | SUS 316 |
| 316L | 316L | S31603 | 022Cr17Ni12Mo2 | 1.4404 | X 3 CrNiMo 17 12 2 | - | 2348 | SUS 316L |
| 316Ti | 316Ti | S31635 | 0Cr18Ni12Mo2Ti | 1.4571 | X 6 CrNiMoTi 17 12 2 | 08KH17N13M2T 10KH17N13M2T |
2350 | - |
| 321 | 321 | S32100 | 0Cr18Ni11Ti | 1.4541/1.4878 | X 6 CrNiTi 18 10 | 12KH18N10T | 2337 | SUS 321 |
| 347 | 347 | S34709 | 0Cr18Ni11Nb | 1.4550 | X 6 CrNiNb 18 10 | - | 2338 | SUS 347 |
| 309S | 309S | S30908 | 0Cr23N13 | 1.4833 | X 6 CrNi 22 13 | 20KH23N18 | - | SUS 309S |
| 310S | 310S | S31008 | 06Cr25Ni20 | 1.4842 | X 6 CrNi 25 20 | 20KH25N20S2 | 2361 | SUS 310S |
| 416 | 416 | S41600 | Y1Cr13 | 1.4005 | X12CrS13 | - | 2380 | SUS 416 |
| 2205 | 2205 | S32205/S31803 | 00Cr22Ni5Mo3N | 1.4462 | X2CrNiMoN22-5-3 | 02Ch22N5AM2 | 2377 | SUS 329J3L |
| 2507 | 2507 | S32750 | 00Cr25Ni7Mo4N | 1.4410 | X 2 CrNiMoN 25-7-4 | - | - | - |
| 904L | 904L | N08904 | - | 1.4539 | - | - | - | - |
| 254SMO | 254SMO | S31254 | - | 1.4547 | X1CrNiMoCuN20-18-7 | - | 2378 | - |
| 253MA | 253MA | S30815 | - | 1.4835 | X9CrNiSiNCe21-11-2 | - | 2368 | - |
| 17-4PH/630 | 17-4PH/630 | S17400 | 0Cr17Ni4Cu4Nb | 1.4542 | X5CrNiCuNb16-4 | 05Ch16N4D2B | - | SUS630 |
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