What is the equivalent of 310Si2 stainless steel?
Sep 08, 2026
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What is 310Si2 stainless steel?
310Si2 is a high-silicon-modified austenitic heat-resistant stainless steel designed to enhance high-temperature strength and oxidation resistance. It is closely related to 310S but features one key difference: a significantly higher silicon content. This makes it better suited for load-bearing furnace components that must withstand high temperatures.
310Si2 stainless steel Equivalent Grades
| Standard | Grade / Name |
| EN / DIN | 1.4841 / X15CrNiSi25-21 |
| AISI / ASTM | AISI 314 |
| JIS | SUH 310 |
| UNS | S31400 |
| GB (China) | 2Cr25Ni20Si2 |
310Si2 stainless steel Chemical Composition (Typical Values)
| Element | Content (%) |
| Carbon | ≤ 0.20 |
| Silicon | 1.50 – 2.50 |
| Manganese | ≤ 2.00 |
| Phosphorus | ≤ 0.045 |
| Sulfur | ≤ 0.015 |
| Chromium | 24.00 – 26.00 |
| Nickel | 19.00 – 22.00 |
| Nitrogen | ≤ 0.11 |
310Si2 stainless steel Mechanical Properties (at Room Temperature 20°C)
| Property | Metric Value |
| Tensile Strength (Rm) | 550 – 750 MPa |
| Yield Strength (Rp0.2) | ≥ 230 MPa |
| Elongation (A5) | ≥ 30 % |
| Hardness (HBW) | ≤ 223 |
| Modulus of Elasticity | 196 GPa |
310Si2 stainless steel Physical Properties
| Property | Value (at 20°C) |
| Density | 7.9 g/cm³ |
| Thermal Conductivity | 15.0 W/(m·K) |
| Specific Heat Capacity | 500 J/(kg·K) |
| Electrical Resistivity | 0.90 Ω⋅mm2/m |
| Magnetic Permeability | Non-magnetic |
| Max Service Temp (in Air) | 1150 °C (2100 °F) |
High-Temperature Strength (Creep Rupture - Approximate)
| Temperature (°C) | Yield Strength
Rp0.2Rp0.2 (MPa) |
10,000h Creep Rupture Strength (MPa) |
| 600°C | 145 | 110 |
| 700°C | 120 | 45 |
| 800°C | 100 | 20 |
| 900°C | 80 | 9 |
| 1000°C | 60 | 4 |
310Si2 vs. 310S vs. 310H: Key Differences
| Parameter | 310S (1.4845) | 310Si2 (1.4841) | 310H (S31009) |
| C | ≤ 0.08 % | ≤ 0.15 % | 0.04 – 0.10 % |
| Si | ≤ 1.5 % | 1.5 – 2.0 % | ≤ 0.75 % |
| Key advantage | Weldability | Oxidation resistance | Creep strength |
| Max oxidation temp | ~1100 °C | ~1150 °C | ~1100 °C |
| Best for | Welded structures | Thermal cycling / spallation | Sustained high-temp load |
310Si2 stainless steel Applications:
Furnace Construction: Conveyor belts, rollers, burners, and furnace linings.
Heat Treatment: Annealing boxes, hardening pots, and baskets.
Chemical/Petrochemical: Heat exchangers, steam boiler components.
Glass Industry: Structural parts for glass melting and handling.
310Si2 vs. 310S Stainless Steel: How to Choose?
310Si2 (1.4841 / AISI 314) offers the highest oxidation resistance among the 310 series grades. Its silicon content-0.5% higher than that of 310S-not only raises the oxidation limit from approximately 1100°C to about 1150°C but also significantly improves scale adhesion during thermal cycling. 310Si2 is the preferred choice if thermal cycling or long-term service at temperatures above 1100°F is the primary consideration; however, if the application involves sustained creep loading, 310H should be selected.
310Si2 Stainless Steel Suppliers and Manufacturers
As a leading global steel supplier, GNEE provides comprehensive solutions for the 310Si2 (1.4841) steel grade.
1. Material Standards and Certification
GNEE ensures that all 310Si2 materials comply with international standards:
EN 10095 / EN 10088 (European Standards)
ASTM A240 / A312 / A276 (US Standards)
MTC (Mill Test Certificate): Provided in accordance with EN 10204 3.1 or 3.2 standards.
2. Testing and Quality Control
Prior to shipment, GNEE typically provides or assists in arranging third-party inspections (e.g., SGS, BV, TUV):
PMI (Positive Material Identification): Verification of nickel (20%) and silicon (2%) content.
Ultrasonic Testing (UT): For heavy plates and large-diameter bars.
Mechanical Property Testing: Tensile strength and elongation tests at both ambient and elevated temperatures.
3. Logistics and Export
Packaging: Standard seaworthy packaging (wooden cases, steel racks, or moisture-proof paper wrapping).
Global Distribution: Extensive experience exporting to over 60 countries; support for flexible Incoterms (e.g., FOB, CIF, CFR, DDP).
310Si2 Stainless Steel specification
| Product Category | Form Type | Typical Dimensions (Size Range) | Surface Finish |
| Plates & Sheets | Hot Rolled / Cold Rolled |
Thickness: 0.3mm – 100mm; Width: 1000mm – 2500mm |
2B, NO.1, NO.4, BA, HL |
| Coils & Strips | Precision Strips / Wide Coils |
Thickness: 0.1mm – 10mm; Width: 10mm – 1500mm |
2B, BA, Polished |
| Round Bars | Forged / Hot Rolled / Cold Drawn | Diameter: 2mm – 500mm | Bright, Black, Peeled, Grinding |
If you are working on a specific project, please provide the following information:
What temperatures or environments (such as gases or chemicals) will the steel be exposed to?
Do you require steel plate, bar, or coil for your manufacturing process?
I can help you determine whether 310Si2 is a suitable choice or recommend alternative materials.
FAQ
What is the difference between 310S and 310Si2?
The main difference lies in the silicon content:
310S (1.4845): Silicon content is typically ≤ 0.75%. It is a standard grade suitable for high-temperature environments up to 1050°C.
310Si2 (1.4841): Silicon content ranges from 1.50% to 2.50%. It offers significantly better oxidation and carburization (carbon absorption) resistance, with a maximum service temperature of up to 1150°C.
What is the maximum service temperature for 310Si2?
Continuous service (in air): Approximately 1150°C (2100°F).
Intermittent service: Approximately 1050°C – 1100°C.
Note: Operating temperatures should be reduced in high-sulfur environments, as sulfur attacks the nickel content in the material.
Is 310Si2 magnetic?
No. As an austenitic stainless steel, 310Si2 is non-magnetic in the annealed condition. However, it may exhibit very slight magnetism after severe cold working, although this is less common than with 304 or 316 grades.
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