ASME SA240 310S Stainless Steel Plate | SA240 Type 310S
What is ASME SA240 310S Stainless Steel Plate?
As a professional stainless steel plate supplier and China Mill-Direct Supply / Mill Direct Exporter, SHH STEEL is pleased to present ASME SA240 310S Stainless Steel Plate, also known as SA240 Type 310S.
ASME SA240 Type 310S is a low-carbon austenitic stainless steel containing very high levels of chromium (24–26%) and nickel (19–22%). These elevated alloy contents provide outstanding resistance to high-temperature oxidation and significantly better strength at elevated temperatures compared with 304, 309S or 316 grades. The low carbon content (≤ 0.08%) improves weldability and reduces the risk of intergranular corrosion after welding.
Type 310S is widely regarded as one of the best standard stainless steels for continuous high-temperature service in oxidizing atmospheres. It is commonly used for furnace components, radiant tubes, heat-treatment fixtures, kiln parts, and high-temperature process equipment operating up to approximately 1100°C. Compared with Type 309S, it offers superior oxidation resistance and higher temperature capability.
SHH STEEL supplies ASME SA240 310S as true Mill Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, full heat traceability, and shorter lead times. We offer a practical dimensional range and a full selection of surface finishes to meet project requirements.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | ASME SA240 / SA240M | Full compliance |
| Steel Grade | Type 310S (UNS S31008) | Confirmed |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Solution Annealed | Standard |
| Thickness Range | 1 mm – 80 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, No.4, and others on request | Available |
| Certification | EN 10204 3.1 / ASME Mill Test Certificate | Available |
Chemical Composition
Heat Analysis (Ladle Analysis) according to ASME SA240 Type 310S:
| 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 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
Product Analysis (typical permissible variations):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 1.50 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 23.90 – 26.10 |
| Nickel (Ni) | 18.90 – 22.10 |
| Nitrogen (N) | ≤ 0.10 |
The very high chromium and nickel contents are the key factors that give Type 310S its outstanding high-temperature oxidation resistance and elevated-temperature strength. The low carbon limit improves weldability and reduces sensitization risk.
Mechanical Properties
Room-Temperature Mechanical Properties (Annealed Condition)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa (75 ksi) |
| Yield Strength (0.2%) | ≥ 205 MPa (30 ksi) |
| Elongation (in 50 mm) | ≥ 40% |
| Hardness | ≤ 217 HB / ≤ 95 HRB |
Elevated-Temperature Performance ASME SA240 310S retains useful strength and outstanding oxidation resistance at temperatures up to approximately 1100°C in continuous service in oxidizing atmospheres. It offers better high-temperature performance than 309S and is one of the most capable standard austenitic grades for severe heat service.
Physical Properties
- Density: approximately 7.90 g/cm³
- Melting Range: approximately 1400–1450°C
- Magnetic: Non-magnetic in the annealed condition
Material Comparison
| Grade | Cr / Ni Content | Key Advantage | Typical Service Focus |
|---|---|---|---|
| SA240 Type 309S | 23Cr-13Ni | Good oxidation resistance + economical | Furnace & heat-treatment equipment |
| SA240 Type 309H | 23Cr-13Ni (higher C) | Higher strength at elevated temperature | Continuous high-temp service |
| SA240 Type 310S | 25Cr-20Ni | Outstanding oxidation resistance | Most severe high-temp oxidizing service |
| SA240 Type 310H | 25Cr-20Ni (higher C) | Highest high-temp strength + oxidation resistance | Severe continuous high-temp service |
| SA240 Type 304H | 18Cr-8Ni | Economical high-temperature strength | Moderate high-temp service |
ASME SA240 310S is selected when superior high-temperature oxidation resistance is required beyond the capability of 309S. For applications that also demand higher allowable stresses at temperature, the high-carbon version 310H may be preferred. Related grades frequently compared include astm a240 type 309s stainless steel sheet plate and astm a240 type 310h stainless steel sheet plate.
Corrosion Resistance
In the annealed condition, ASME SA240 Type 310S offers good general corrosion resistance in many atmospheric and mild chemical environments. Its primary strength lies in high-temperature oxidation resistance rather than aqueous corrosion performance.
It resists oxidation and scaling exceptionally well in continuous service up to approximately 1100°C in air or oxidizing atmospheres. Resistance to sulfidation and carburization is moderate to good. In aqueous chloride environments its pitting resistance is lower than molybdenum-bearing grades such as 316L or 317L.
Weldability
ASME SA240 Type 310S has good weldability by all standard fusion and resistance welding methods. The low carbon content reduces the risk of intergranular corrosion after welding.
Matching or slightly over-alloyed filler metals (E310 / ER310 or E310L / ER310L) are commonly used. The grade can be welded to other austenitic stainless steels and to carbon steels using appropriate procedures. Post-weld heat treatment is generally not required for most high-temperature applications.
Heat Treatment
ASME SA240 Type 310S is supplied in the solution-annealed condition.
Recommended Solution Annealing Parameters
- Temperature range: 1040 – 1150°C (typically 1050 – 1120°C)
- Holding (soaking) time: – Plates ≤ 25 mm: minimum 10–20 minutes after the section reaches temperature – Plates 25–50 mm: minimum 20–40 minutes – Plates > 50 mm: 30–60 minutes or longer to ensure uniformity
- Cooling: Rapid cooling (water quench preferred for thicker plates) to restore maximum corrosion resistance and ductility.
Proper solution annealing dissolves any carbides that may have formed and optimizes the microstructure for high-temperature service.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| No.1 | Hot-rolled, annealed and pickled | SA240 310S No.1 – most common for furnace and high-temperature plate |
| 2B | Cold-rolled, annealed, pickled, skin-passed | SA240 310S 2B – thinner plates and general fabrication |
| No.4 | Brushed finish | SA240 310S No.4 – when improved surface appearance is required |
| Special | Ground or custom finishes | SA240 310S Special – on request |
SHH STEEL regularly supplies ASME SA240 310S in No.1 and 2B finishes, and can provide other finishes according to project requirements.
Tolerances
Dimensional tolerances for ASME SA240 310S Stainless Steel Plate conform to ASME SA240 and the general requirements of ASTM A480.
Typical available size range for SA240 310S plate:
- Thickness: 1 mm – 80 mm (thicker plates available on request)
- Width: up to 2000–3000 mm
- Length: up to 12000 mm or cut-to-length according to customer requirements
Thickness, width, length and flatness tolerances are controlled within standard limits. Tighter tolerances for SA240 310S plate can be arranged for specific project needs. SHH STEEL provides precise dimensional control for both standard and custom-size SA240 310S plates.
Equivalent Material Grades
| Grade / Designation | Standard | Notes |
|---|---|---|
| SA240 Type 310S | ASME SA240 | — |
| A240 Type 310S | ASTM A240 | Essentially identical |
| UNS S31008 | — | Unified Numbering System |
| 1.4845 / X8CrNi25-21 | EN 10088-2 | European equivalent |
| SUS310S | JIS G4305 | Japanese equivalent |
| 06Cr25Ni20 | GB/T 3280 | Chinese equivalent |
Related grades frequently evaluated with ASME SA240 310S include astm a240 type 309s stainless steel sheet plate, astm a240 type 310h stainless steel sheet plate, astm a240 type 309h stainless steel sheet plate, and astm a240 type 304h stainless steel sheet plate.
Applications
ASME SA240 Type 310S is widely used in the most demanding high-temperature oxidizing environments. Typical applications of SA240 310S include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Heat Treatment Equipment | SA240 310S furnace parts, radiant tubes, muffles, retorts, baskets |
| Industrial Furnaces | SA240 310S kiln components, fixtures, supports |
| Power Generation | SA240 310S boiler components, high-temperature ducting |
| Chemical & Petrochemical | SA240 310S high-temperature reactors and process equipment |
| Cement & Metallurgical | SA240 310S kiln parts and high-temperature structural components |
| Automotive & Exhaust | SA240 310S high-temperature exhaust components |
| General High-Temperature Use | SA240 310S thermal processing equipment and structural parts |
Because of its superior oxidation resistance, SA240 310S is often the first choice when service temperatures approach or exceed the practical limits of 309S.
Why Choose SHH STEEL
SHH STEEL is a China Mill-Direct Supply and Mill Direct Exporter of stainless steel plate. We maintain long-term strategic cooperation with major Chinese stainless steel mills and supply ASME SA240 Type 310S with the following advantages:
- Competitive mill-direct pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1 / ASME)
- Flexible dimensions and surface finishes (including SA240 310S No.1 and SA240 310S 2B)
- Technical support for high-temperature material selection
- Reliable worldwide logistics and export documentation
FAQ
- What is the main advantage of SA240 310S over SA240 309S?SA240 310S has higher chromium (24–26%) and nickel (19–22%) contents, providing superior oxidation resistance and better performance in continuous service at the highest temperatures (up to approximately 1100°C). SHH STEEL recommends 310S when the service temperature exceeds the practical capability of 309S.
- What is the difference between 310S and 310H?Type 310H has a controlled higher carbon range (0.04–0.10%) to improve high-temperature strength, while Type 310S has a maximum of 0.08% carbon for better weldability. SHH STEEL can supply both grades according to project requirements.
- Is ASME SA240 310S magnetic?Non-magnetic in the annealed condition. SHH STEEL supplies fully annealed material that meets this requirement.
- What is the density of SA240 Type 310S?Approximately 7.90 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
- Can SHH STEEL supply dual-certified ASME SA240 / ASTM A240 Type 310S?Yes, SHH STEEL commonly supplies dual-certified ASME SA240 / ASTM A240 Type 310S material.
Conclusion
ASME SA240 310S Stainless Steel Plate (SA240 Type 310S) is a low-carbon high-chromium, high-nickel austenitic stainless steel optimized for outstanding high-temperature oxidation resistance and reliable performance in severe heat service. It is the preferred standard grade for many furnace, heat-treatment, and high-temperature process applications operating near 1100°C.
As a professional China Mill-Direct Supply and Mill Direct Exporter, SHH STEEL provides high-quality ASME SA240 Type 310S plate with competitive pricing, full certification, and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including SA240 310S No.1 and SA240 310S 2B), or a competitive quotation.
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