JIS G4305 SUS310S Austenitic Stainless Steel for High-Temperature Service
JIS G4305 SUS310S Austenitic Stainless Steel for High-Temperature Service | Properties & Equivalents
Explore JIS SUS310S stainless steel: chemical composition, mechanical & thermal properties, international equivalents (ASTM 310S, EN 1.4845), and applications in furnace parts and heat exchangers.
Hot rolling, cold rolling, solution annealing, pickling, welding, forming, machining
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JIS G4305 SUS310S Austenitic Stainless Steel for High-Temperature Service Introduction
JIS G4305 SUS310S is a low-carbon austenitic stainless steel with excellent oxidation resistance and high-temperature strength. It contains approximately 25% chromium and 20% nickel, offering superior performance in continuous service up to 1150°C and intermittent service to 1035°C. The low carbon content minimizes carbide precipitation, enhancing resistance to intergranular corrosion in the as-welded condition. This grade is typically supplied in the solution-annealed condition and is widely used for furnace components, heat treatment equipment, and thermal processing applications where both heat and corrosion resistance are critical.
JIS G4305 SUS310S Austenitic Stainless Steel for High-Temperature Service Chemical Composition
The chemical composition of SUS310S as per JIS G4305 ensures a fully austenitic structure with high Cr and Ni for superior oxidation resistance. The low carbon content (max 0.08%) prevents sensitization and intergranular corrosion after welding.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Max |
| Silicon (Si) | ≤ 1.50 | Max |
| Manganese (Mn) | ≤ 2.00 | Max |
| Phosphorus (P) | ≤ 0.045 | Max |
| Sulfur (S) | ≤ 0.030 | Max |
| Nickel (Ni) | 19.00 - 22.00 | |
| Chromium (Cr) | 24.00 - 26.00 | |
| Iron (Fe) | Balance |
JIS G4305 SUS310S Austenitic Stainless Steel for High-Temperature Service Thermal and Electrical Physical Properties
Physical properties for SUS310S are typical for an austenitic stainless steel with high chromium and nickel. Values are at room temperature unless specified otherwise. Thermal conductivity is relatively low, and the high coefficient of thermal expansion should be considered in design.
- Density: ~8.0 g/cm³
- Melting range: 1400-1455°C
| Property | Standard / Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 8.0 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 200 | GPa | 20°C |
| Shear Modulus (G) | 77 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.30 | 20°C | |
| Thermal Expansion Coefficient (α) | 14.4 | 10⁻⁶/K | 20 - 100°C |
| Thermal Expansion Coefficient (α) | 16.0 | 10⁻⁶/K | 20 - 500°C |
| Thermal Expansion Coefficient (α) | 17.0 | 10⁻⁶/K | 20 - 1000°C |
| Thermal Conductivity (λ) | 14.2 | W/(m·K) | 100°C |
| Thermal Conductivity (λ) | 18.6 | W/(m·K) | 500°C |
| Specific Heat Capacity | 500 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρ_e) | 0.78 | μΩ·m | 20°C |
JIS G4305 SUS310S Austenitic Stainless Steel for High-Temperature Service Mechanical Properties
Mechanical properties are based on JIS G4305 for cold-rolled sheet/strip in solution-annealed condition. Values are minimum unless otherwise specified. Elongation depends on thickness. Hardness is not mandatory but typically provided.
- Rp0.2: 0.2% proof strength (yield strength)
- Rm: tensile strength
- A: elongation after fracture
- HRBW: Rockwell hardness B scale (tungsten indenter)
| Property | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| 0.2% Yield Strength (Rp0.2) | ≥ 205 | MPa | At room temperature, solution annealed |
| Tensile Strength (Rm) | ≥ 520 | MPa | At room temperature |
| Elongation (A) | ≥ 40 | % | Nominal thickness ≤ 8 mm |
| Elongation (A) | ≥ 38 | % | Nominal thickness > 8 mm to ≤ 20 mm |
| Hardness | ≤ 90 | HRBW | Typical, not mandatory in standard |
| Bend Test | 180° bend, d=2a | For thickness ≤ 8 mm; no cracks on outside of bend |
JIS G4305 SUS310S Austenitic Stainless Steel for High-Temperature Service Exact Equivalent Material Standards and Substitutable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International / USA | ASTM A240/A240M | 310S (UNS S31008) | Exact chemical and property match |
| European Union | EN 10088-2 | 1.4845 (X8CrNi25-21) | Exact match; slight sulfur lower |
| China | GB/T 20878, GB/T 4237 | 06Cr25Ni20 (old 0Cr25Ni20) | Exact match; S31008 equivalent |
| International (ISO) | ISO 15510 | X6CrNi25-20 | Chemical equivalent |
| Russia | GOST 5632 | 10Х23Н18 (10Kh23N18) | Close but not exact; carbon ≤0.10, check nickel range |
| Japan | JIS G4304 / G4305 | SUS310S | Original grade |
JIS G4305 SUS310S Austenitic Stainless Steel for High-Temperature Service Application Introduction
SUS310S is engineered for elevated-temperature service where resistance to oxidation, sulfidation, and carburization is required. It is not recommended for applications involving frequent thermal cycling or heavy aqueous corrosion at ambient temperatures. Typical applications:
- Furnace parts: burners, retorts, muffles, annealing covers
- Heat exchangers and radiant tubes in petrochemical and power plants
- Kiln and boiler components
- Food processing equipment (dry, high-temperature areas)
- Aerospace hot-section parts (limited)
Product Applications: Radiant tubes and heater tubes, Annealing boxes and bell-type furnace covers, Combustion chambers and burner nozzles, Recuperator tubes, Hot gas ducts and liners, Rotary kiln components, Thermal oxidizer parts
Processed into products: Welded furnace pipes and headers, Fasteners for high-temperature bolting, Expansion joints and bellows (thin gauge), Flame impingement shields, Support brackets and hangers in furnaces, Nozzle mix burners, Corrugated sheets for heat recuperators
Application industries: Heat treatment and furnace manufacturing, Chemical and petrochemical processing, Power generation (coal, gas, nuclear), Steel and non-ferrous metal production, Cement and ceramics, Food processing (high-temperature baking/drying), Aerospace (exhaust components)
JIS G4305 SUS310S Austenitic Stainless Steel for High-Temperature Service Similar / Alternative Materials for Comparison
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240 | 310 (S31000) | Higher carbon (max 0.25%); lower creep strength, more prone to sensitization |
| USA | ASTM A240 | S30815 (253 MA) | Contains N and Ce; superior oxidation resistance to 1150°C, higher yield strength |
| EU | EN 10088-2 | 1.4841 (X15CrNiSi25-21) | Higher carbon and silicon; used for heat-resistant castings, not equivalent |
| Europe / USA | EN / ASTM | 1.4876 / 800H (UNS N08810) | Nickel-iron-chromium alloy; superior carburization resistance, higher cost |
| China | GB/T 4237 | 06Cr23Ni13 (309S) | Lower Cr (23%) and Ni (13%); suitable for less oxidizing environments, lower cost |
Notes:
Welding: SUS310S has excellent weldability using matching filler metals (e.g., AWS E310-15/16) without preheating. Post-weld annealing is generally not required for corrosion resistance, but may be performed to relieve stresses. Oxidation resistance: Service above 950°C may lead to sigma phase formation, reducing toughness. Continuous and steady temperature application maximizes life. Forming: Solution-annealed material is readily formed; however, work hardening rate is higher than low-alloy steels. Availability: Typically supplied in thicknesses from 0.5 mm to 50 mm for sheet/plate; pipes in schedules 5S to 80S as per JIS or ASTM dimensions.
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