Austenitic 310Cb (UNS S31040) Stainless Steel Plate/Coil - High-Temperature Niobium-Stabilized Grade
Austenitic 310Cb (UNS S31040) Stainless Steel Plate/Coil - High-Temperature Niobium-Stabilized Grade | Technical Data
Comprehensive material analysis of Austenitic 310Cb (S31040) stainless steel including chemical composition, mechanical properties, thermal and electrical properties, international equivalents, and application guidelines for plate and coil products.
Hot rolling, cold rolling, solution annealing, pickling
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
Austenitic 310Cb Stainless Steel Plate/Coil - High-Temperature Niobium-Stabilized Grade Introduction
Austenitic 310Cb (UNS S31040) is a niobium-stabilized, high-chromium, high-nickel stainless steel designed for superior high-temperature oxidation resistance and enhanced resistance to intergranular corrosion. The addition of niobium (columbium) stabilizes the alloy against sensitization during welding or service at elevated temperatures, making it ideal for applications up to 2000°F (1093°C). It exhibits excellent strength, creep resistance, and corrosion resistance in oxidizing, carburizing, and nitriding environments. Commonly supplied as plate and coil in the annealed condition, 310Cb is widely used in furnace components, heat exchangers, and chemical processing equipment.
Austenitic 310Cb Stainless Steel Plate/Coil - High-Temperature Niobium-Stabilized Grade Chemical Composition
Chemical composition according to ASTM A240 for UNS S31040 (310Cb). All values are weight percent. The niobium content is specified as 10 times the carbon content minimum to ensure stabilization, with a maximum of 1.10%.
| Element | Specification | Remarks |
|---|---|---|
| Carbon (C) | ≤0.08 | Maximum |
| Manganese (Mn) | ≤2.00 | Maximum |
| Phosphorus (P) | ≤0.045 | Maximum |
| Sulfur (S) | ≤0.030 | Maximum |
| Silicon (Si) | ≤1.50 | Maximum |
| Chromium (Cr) | 24.0 - 26.0 | |
| Nickel (Ni) | 19.0 - 22.0 | |
| Columbium (Nb) (Niobium) | 10×C min ≤1.10 | Stabilizing addition |
| Iron (Fe) | Balance | Remainder |
Austenitic 310Cb Stainless Steel Plate/Coil - High-Temperature Niobium-Stabilized Grade Thermal and Electrical Physical Properties
Typical physical properties for 310/310Cb stainless steel at room temperature unless specified. These values may vary slightly based on specific processing conditions and are provided as general engineering guidance.
| Property | Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 8.0 (0.29) | g/cm³ (lb/in³) | At room temperature |
| Elastic Modulus (E) | 200 (29×10³) | GPa (ksi) | At room temperature |
| Shear Modulus (G) | 77 (11.2×10³) | GPa (ksi) | Typical, calculated from E and ν |
| Poisson's Ratio (ν) | 0.27 - 0.30 | - | Room temperature |
| Thermal Expansion Coefficient (α) | 15.9 | µm/m·°C | 20 - 100°C |
| Thermal Expansion Coefficient (α) | 16.2 | µm/m·°C | 20 - 300°C |
| Thermal Expansion Coefficient (α) | 17.0 | µm/m·°C | 20 - 500°C |
| Thermal Conductivity (λ) | 14.2 | W/m·K | At 100°C |
| Thermal Conductivity (λ) | 17.0 | W/m·K | At 500°C |
| Specific Heat Capacity | 500 | J/kg·K | At 20°C |
| Electrical Resistivity (ρe) | 0.78 (78) | µΩ·m (µΩ·cm) | At 20°C |
Austenitic 310Cb Stainless Steel Plate/Coil - High-Temperature Niobium-Stabilized Grade Mechanical Properties
Minimum mechanical properties at room temperature for 310Cb plate/coil in the solution-annealed condition per ASTM A240. Elevated temperature properties may vary. The bend test is applicable to plate material up to 1 inch thick.
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (0.2% offset) | ≥205 (30) | MPa (ksi) | Room temperature, annealed |
| Tensile Strength | ≥515 (75) | MPa (ksi) | Room temperature, annealed |
| Elongation in 50mm (2 in.) | ≥40 | % | Room temperature, annealed |
| Hardness (Brinell) | ≤217 | HB | Room temperature, annealed |
| Hardness (Rockwell B) | ≤95 | HRB | Room temperature, annealed |
| Bend Test (180°) | No cracks | - | Bend diameter = 2×t, for thickness ≤ 1 in., annealed |
Austenitic 310Cb Stainless Steel Plate/Coil - High-Temperature Niobium-Stabilized Grade Directly Equivalent Material Standards & Replacement Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240/A240M | UNS S31040 (310Cb) | Plate, sheet, strip |
| USA | ASME SA240 | UNS S31040 | Identical to ASTM |
Austenitic 310Cb Stainless Steel Plate/Coil - High-Temperature Niobium-Stabilized Grade Application Introduction
310Cb stainless steel is ideally suited for high-temperature structural applications where resistance to sensitization and intergranular corrosion is required. It is widely utilized in aggressive oxidizing and carburizing environments. The niobium stabilization enables as-welded structures to resist intergranular attack without post-weld annealing.
Product Applications: Furnace muffles and retorts, Radiant tubes and burners, Heat exchanger tubes and plates, Boiler shells, Welded structures for hot gas handling, Annealing boxes, Kiln linings and parts, Catalyst support grids
Processed into products: Furnace hardware (hangers, supports), Pyrometer protection tubes, Chemical reactor internals, Nitriding fixtures, Coal gasifier internals, Automotive exhaust manifolds and flanges, Heat treatment baskets and trays
Application industries: Chemical Processing, Petrochemical & Oil Refining, Power Generation (fossil & nuclear), Heat Treating & Furnace Equipment, Automotive (exhaust systems), Aerospace (high-temperature components)
Austenitic 310Cb Stainless Steel Plate/Coil - High-Temperature Niobium-Stabilized Grade Similar/Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240 | 310S (S31008) | Higher carbon, no Nb; slightly lower temperature strength |
| USA | ASTM A240 | 310 (S31000) | Higher carbon; no stabilization |
| USA | ASTM A240 | 321 (S32100) | Titanium-stabilized austenitic, lower Cr-Ni |
| USA | ASTM A240 | 347 (S34700) | Nb-stabilized 18Cr-8Ni stainless steel |
| EU | EN 10088-2 | 1.4845 (X8CrNi25-21) | Similar base composition, no intentional Nb |
| Japan | JIS G4305 | SUS310S | Equivalent to 310S, no Nb |
Notes:
310Cb (S31040) provides excellent oxidation resistance up to 2000°F (1093°C) and good sulfidation resistance. The niobium stabilization prevents chromium carbide precipitation during welding, enabling the as-welded structure to resist intergranular corrosion without post-weld annealing. For optimal performance, solution annealing should be performed at 1050-1150°C followed by rapid cooling. This grade is not recommended for applications where heavy cold work is required without subsequent annealing due to risk of stress corrosion cracking.
- Share
