AISI 310Cb Stainless Steel Plate | 310Cb China steel mill-Direct Supply
What is AISI 310Cb Stainless Steel Plate？
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 310Cb Stainless Steel Plate.
AISI 310Cb (UNS S31040), also known as 310Cb, is a niobium (columbium)-stabilized version of the heat-resisting austenitic stainless steel 310. It contains approximately 24–26% chromium and 19–22% nickel, with intentional niobium addition to stabilize the grade against intergranular corrosion. This stabilization allows the material to maintain good corrosion resistance after welding or exposure to the sensitization temperature range, while retaining the outstanding high-temperature oxidation resistance characteristic of the 25Cr-20Ni composition.
AISI 310Cb is particularly suitable for welded high-temperature equipment such as furnace components, radiant tubes, heat-treatment fixtures, kiln parts and petrochemical process equipment operating in severe oxidizing atmospheres where resistance to intergranular attack is also required.
SHH STEEL supplies AISI 310Cb as true China steel mill-Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, complete heat traceability and reliable delivery. SHH STEEL offers AISI 310Cb in plate and sheet form across a practical range of thicknesses and surface finishes suitable for elevated-temperature service.
AISI 310Cb is frequently compared with a240 310s, a240 310h, a240 309s, a240 321, a240 347 and a240 304l when selecting stabilized or high-temperature grades. SHH STEEL provides technical support to help customers choose the most appropriate material.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | AISI 310Cb / UNS S31040 | Confirmed |
| Related Standards | ASTM A240, ASME SA240, related high-temperature specs | Available |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Solution Annealed | Standard |
| Thickness Range | 1 mm – 100 mm (thicker available on request) | Custom sizes supported |
| Width | Up to 2000–3000 mm | Available |
| Length | Up to 12000 mm or cut-to-length | Available |
| Surface Finish | No.1, 2B, and others on request | Available |
| Certification | EN 10204 3.1 / Mill Test Certificate | Available |
SHH STEEL can supply AISI 310Cb dual-certified to ASTM A240 / ASME SA240 when required by the project.
Chemical Composition
Typical Chemical Composition of AISI 310Cb (UNS S31040):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 1.50 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 24.00 – 26.00 |
| Nickel (Ni) | 19.00 – 22.00 |
| Niobium (Nb/Cb) | 10 × C min – 1.10 max |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
The intentional niobium (columbium) addition is the key stabilizing element in AISI 310Cb. Niobium combines preferentially with carbon to form stable niobium carbides, thereby preventing chromium carbide precipitation at grain boundaries and providing excellent resistance to intergranular corrosion after welding. Combined with very high chromium and nickel, the grade delivers outstanding high-temperature oxidation resistance. SHH STEEL carefully controls the niobium-to-carbon ratio to ensure effective stabilization.
Mechanical Properties
Annealed Condition (typical values)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa (75 ksi) |
| Yield Strength (0.2%) | ≥ 205 MPa (30 ksi) |
| Elongation (in 50 mm) | ≥ 40% |
| Hardness | ≤ 217 HB |
At elevated temperatures, AISI 310Cb retains useful strength and outstanding oxidation resistance. The niobium stabilization also helps maintain corrosion performance after high-temperature exposure and welding. For applications requiring higher creep strength, related grades such as a240 310h may be considered. SHH STEEL supplies material with consistent high-temperature properties.
Physical Properties Density is approximately 7.90 g/cm³. The grade is non-magnetic in the annealed condition. Melting range is approximately 1400–1450°C.
Material Comparison
| Grade | Stabilization | Cr (%) | Ni (%) | Weldability & IGC | Oxidation Resistance | Typical Preference |
|---|---|---|---|---|---|---|
| AISI 310S | Low carbon | 24–26 | 19–22 | Excellent | Excellent | Welded severe high-temperature service |
| AISI 310Cb | Niobium (Cb) | 24–26 | 19–22 | Excellent | Excellent | Stabilized severe high-temp welded service |
| AISI 310H | Higher carbon | 24–26 | 19–22 | Moderate | Excellent | High-temp strength under load |
| AISI 309S | Low carbon | 22–24 | 12–15 | Excellent | Very Good | High-temperature oxidizing service |
| AISI 321 | Titanium | 17–19 | 9–12 | Excellent | Good | Stabilized moderate high-temp service |
| AISI 347 | Niobium | 17–19 | 9–13 | Excellent | Good | Stabilized welded service |
AISI 310Cb is selected when both outstanding high-temperature oxidation resistance and stabilization against intergranular corrosion are required. Compared with a240 310s, the niobium addition provides additional protection in the heat-affected zone. For higher creep strength under load, SHH STEEL recommends a240 310h. Stabilized grades such as a240 321 or a240 347 are often considered for lower service temperatures.
Corrosion Resistance
AISI 310Cb provides outstanding resistance to oxidation and scaling in air and oxidizing atmospheres at elevated temperatures up to approximately 1100°C in continuous service (depending on conditions). The niobium stabilization ensures excellent resistance to intergranular corrosion after welding or exposure to the sensitization temperature range.
At room temperature it offers good resistance to atmospheric corrosion and many mild chemical environments. In sulfur-containing or highly carburizing atmospheres, performance may be limited. For aqueous chloride environments, SHH STEEL recommends a240 316l or a240 2205.
Weldability
AISI 310Cb has excellent weldability due to niobium stabilization. Matching or appropriate niobium-bearing filler metals are recommended. The stabilization effectively prevents intergranular corrosion in the heat-affected zone, making post-weld annealing generally unnecessary for most applications.
SHH STEEL recommends proper welding procedures and post-weld cleaning to achieve optimum high-temperature and corrosion performance. This combination of outstanding high-temperature capability and as-welded corrosion resistance is the main advantage of AISI 310Cb over non-stabilized grades.
Heat Treatment
AISI 310Cb is normally supplied in the solution-annealed condition by SHH STEEL.
Recommended solution annealing temperature range is 1040–1150°C, followed by rapid cooling. Proper annealing ensures that niobium is available for effective stabilization and optimizes both room-temperature ductility and high-temperature oxidation resistance. SHH STEEL controls heat treatment to ensure consistent quality for elevated-temperature service.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| No.1 | Hot-rolled, annealed and pickled | AISI 310Cb No.1 – most common for industrial high-temp plate |
| 2B | Cold-rolled, annealed, pickled, skin-passed | AISI 310Cb 2B – thinner plates |
| Special | Ground or custom finishes | AISI 310Cb Special – on request |
SHH STEEL regularly supplies AISI 310Cb in No.1 finish, which is the preferred condition for most high-temperature plate applications.
Tolerances
Dimensional tolerances for AISI 310Cb Stainless Steel Plate supplied by SHH STEEL generally conform to ASTM A480 practices.
Typical available size range is thickness 1 mm – 100 mm, width up to 2000–3000 mm, and length up to 12000 mm or cut-to-length. SHH STEEL provides precise dimensional control and can support tighter tolerances when required.
Equivalent Material Grades
| Grade / Designation | Standard / Region | Notes |
|---|---|---|
| AISI 310Cb | — | — |
| UNS S31040 | Unified Numbering System | — |
| ASTM A240 Type 310Cb | ASTM A240 | When dual certified |
| 1.4845 related (Nb-stabilized) | EN (Europe) | Closest European grades |
| SUS310 related | JIS G4305 (Japan) | Japanese related grades |
| 0Cr25Ni20 related (Nb) | GB/T (China) | Chinese related grades |
| Related 310S / 310H | Multiple | Low-carbon / high-carbon variants |
Related grades for comparison include a240 310s, a240 310h, a240 309s, a240 321, a240 347 and a240 304l.
Applications
AISI 310Cb is selected for welded high-temperature applications requiring both outstanding oxidation resistance and resistance to intergranular corrosion. Typical applications of AISI 310Cb include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Heat Treatment & Furnaces | AISI 310Cb furnace components, radiant tubes, fixtures, trays |
| Industrial Heating | AISI 310Cb kiln parts, muffles, supports and retorts |
| Power Generation | AISI 310Cb high-temperature ducting and structural parts |
| Petrochemical & Refining | AISI 310Cb furnace linings, process equipment and welded parts |
| Chemical Processing | AISI 310Cb high-temperature vessels and welded components |
| General High-Temperature Service | AISI 310Cb equipment operating in severe oxidizing atmospheres |
SHH STEEL supplies AISI 310Cb for these elevated-temperature welded applications with consistent quality. For related industry solutions, see our energy industry, petrochemical industry and equipment manufacturing pages. Supporting services include steel cutting services and steel welding services.
Why Choose SHH STEEL
SHH STEEL is a China steel mill-Direct Supply specializing in stainless steel plate and sheet. By working directly with major Chinese stainless steel mills, SHH STEEL supplies AISI 310Cb with the following advantages:
- Genuine China steel mill-Direct Supply pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1)
- Niobium-stabilized material optimized for welded severe high-temperature service
- Flexible dimensions and surface finishes (including AISI 310Cb No.1 and AISI 310Cb 2B)
- Technical support for selection among 310S, 310Cb, 310H, 321, 347 and related grades
- Value-added services including steel cutting services, steel welding services and worldwide shipping service
For more information about our company and full product range, please visit China steel Mill Agent-SHH STEEL.
FAQ
- What is the main advantage of AISI 310Cb over AISI 310S?The niobium (columbium) addition provides additional stabilization against intergranular corrosion, offering extra protection in the heat-affected zone after welding. SHH STEEL recommends 310Cb when maximum resistance to intergranular attack in severe high-temperature welded service is required.
- How does AISI 310Cb compare with AISI 321 or 347?AISI 310Cb offers significantly higher chromium and nickel contents and superior high-temperature oxidation resistance, while 321 and 347 are stabilized grades primarily used at lower temperatures. SHH STEEL can help select the appropriate grade based on service temperature and environment.
- What is the density of AISI 310Cb?Approximately 7.90 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
Conclusion
AISI 310Cb Stainless Steel Plate is a niobium-stabilized high-chromium, high-nickel (25Cr-20Ni) austenitic grade that combines outstanding high-temperature oxidation resistance with superior resistance to intergranular corrosion after welding. It is an outstanding choice for welded furnace components, radiant tubes, heat-treatment equipment and petrochemical process equipment operating in severe oxidizing atmospheres.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality AISI 310Cb Stainless Steel Plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including AISI 310Cb No.1 and AISI 310Cb 2B), or a competitive quotation.
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