ASME SA240 800 Stainless Steel Plate | SA240 Type 800
What is ASME SA240 800 Stainless Steel Plate?
As a professional stainless steel and nickel alloy plate supplier and China Mill-Direct Supply / Mill Direct Exporter, SHH STEEL is pleased to present ASME SA240 Type 800 / Alloy 800 Stainless Steel Plate (UNS N08800), also widely known as Incoloy 800.
Alloy 800 is a nickel-iron-chromium alloy designed for excellent strength and resistance to oxidation, carburization and other forms of high-temperature corrosion. With a nominal composition of 30–35% nickel, 19–23% chromium and the balance iron, it maintains structural stability and mechanical properties at elevated temperatures up to approximately 1100°C in continuous service (depending on environment).
Although Alloy 800 is most precisely covered under ASTM B409 / ASME SB-409 for plate, it is frequently requested and dual-certified or cross-referenced in projects that also use ASME SA240 stainless grades. It is widely used in heat exchangers, furnace components, petrochemical processing, power generation, and industrial heating equipment where both high-temperature strength and corrosion resistance are required.
SHH STEEL supplies Alloy 800 / Type 800 plate as true Mill Direct Supply, sourcing from major Chinese and international mills. This enables competitive pricing, consistent quality, full heat traceability and reliable delivery. Material is normally supplied in the annealed condition with a full range of thicknesses and surface finishes.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Designation | Alloy 800 / UNS N08800 (commonly requested as SA240 Type 800) | Full compliance |
| Related Standards | ASTM B409 / ASME SB-409, ASTM B408, etc. | Available |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | 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, and others on request | Available |
| Certification | EN 10204 3.1 / Mill Test Certificate | Available |
Chemical Composition
Heat Analysis (typical for UNS N08800 / Alloy 800):
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 30.00 – 35.00 |
| Chromium (Cr) | 19.00 – 23.00 |
| Iron (Fe) | ≥ 39.50 (balance) |
| Carbon (C) | ≤ 0.10 |
| Manganese (Mn) | ≤ 1.50 |
| Silicon (Si) | ≤ 1.00 |
| Copper (Cu) | ≤ 0.75 |
| Aluminum (Al) | 0.15 – 0.60 |
| Titanium (Ti) | 0.15 – 0.60 |
| Sulfur (S) | ≤ 0.015 |
Product Analysis follows the permissible variations allowed by the applicable ASTM/ASME specifications.
The controlled aluminum and titanium contents, together with the high nickel and chromium levels, provide excellent resistance to oxidation and carburization while maintaining good structural stability at high temperatures. Higher-carbon versions (Alloy 800H / 800HT) are available when enhanced creep strength is required.
Mechanical Properties
Room-Temperature Mechanical Properties (Annealed Condition, typical)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 520 MPa (75 ksi) |
| Yield Strength (0.2%) | ≥ 205 MPa (30 ksi) |
| Elongation (in 50 mm) | ≥ 30% |
| Hardness | ≤ 185 HB |
Elevated-Temperature Performance Alloy 800 retains useful strength and excellent oxidation resistance at temperatures up to 1000–1100°C. For applications requiring higher creep and rupture strength, Alloy 800H (UNS N08810) or 800HT (UNS N08811) with controlled carbon, Al + Ti and grain size are recommended.
Physical Properties
- Density: 7.94 g/cm³
- Melting Range: approximately 1350–1400°C
- Magnetic: Generally non-magnetic in the annealed condition
Material Comparison
| Grade / Alloy | Key Composition | Primary Advantage | Typical Preference |
|---|---|---|---|
| SA240 Type 310S/310H | 25Cr-20Ni | Excellent oxidation resistance | High-temp oxidizing service |
| SA240 Type 330 | 35Ni-19Cr | Good carburization resistance | High-temp reducing/carburizing atmospheres |
| Alloy 800 / Type 800 | 32Ni-21Cr-Fe | Balanced high-temp strength + oxidation/carburization resistance | Heat exchangers, furnace parts, petrochemical |
| Alloy 800H / 800HT | Controlled C, Al+Ti | Superior creep strength | Long-term high-temp pressure service |
| Alloy 625 | High Ni-Cr-Mo-Nb | Outstanding corrosion + high-temp strength | More severe corrosive high-temp service |
Alloy 800 is selected when a good balance of high-temperature strength, oxidation resistance and cost is required. For higher creep strength, Alloy 800H/HT is preferred. Related high-temperature stainless grades include astm a240 type 310s stainless steel sheet plate and astm a240 type 310h stainless steel sheet plate.
Corrosion Resistance
Alloy 800 offers excellent resistance to oxidation, carburization and sulfidation in high-temperature environments. It also provides good general corrosion resistance in many aqueous media and is resistant to chloride stress corrosion cracking under many conditions due to its high nickel content.
It performs well in both oxidizing and moderately reducing high-temperature atmospheres, making it suitable for a wide range of industrial heating and process applications.
Weldability
Alloy 800 has good weldability using standard fusion welding processes. Matching filler metals (ERNiCr-3 / Inconel 82 or equivalent) are commonly recommended to maintain corrosion and high-temperature performance in the weld metal.
Preheating is generally not required. Post-weld heat treatment may be applied depending on service requirements. Proper cleanliness and shielding are important to achieve optimum results.
Heat Treatment
Alloy 800 is normally supplied in the annealed condition.
Recommended Annealing Parameters
- Temperature range: 980 – 1150°C (typically 1050 – 1100°C for standard Alloy 800)
- Holding (soaking) time: Sufficient to ensure uniform temperature throughout the section (typically 15–60 minutes depending on thickness)
- Cooling: Rapid air cool or water quench depending on thickness and desired properties
For Alloy 800H/HT, specific solution annealing treatments and grain size control are applied to optimize creep resistance.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| No.1 | Hot-rolled, annealed and descaled | SA240 800 No.1 / Alloy 800 No.1 – most common for industrial plate |
| 2B | Cold-rolled, annealed, pickled, skin-passed | SA240 800 2B – thinner plates |
| Special | Ground, polished or custom finishes | SA240 800 Special – on request |
SHH STEEL regularly supplies Alloy 800 / Type 800 in No.1 finish and can provide other finishes according to project requirements.
Tolerances
Dimensional tolerances for ASME SA240 Type 800 / Alloy 800 plate generally follow ASTM B409 / ASME SB-409 and related standards.
Typical available size range:
- 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
Thickness, width, length and flatness tolerances are controlled within standard limits. Tighter tolerances can be arranged. SHH STEEL provides precise dimensional control for both standard and custom-size Alloy 800 plates.
Equivalent Material Grades
| Grade / Designation | Standard / UNS | Notes |
|---|---|---|
| Alloy 800 | UNS N08800 | Standard grade |
| Alloy 800H | UNS N08810 | Higher creep strength |
| Alloy 800HT | UNS N08811 | Optimized for high-temp strength |
| 1.4876 / X10NiCrAlTi32-20 | EN | European equivalent |
| NCF 800 | JIS | Japanese equivalent |
Related high-temperature grades frequently evaluated include astm a240 type 310s stainless steel sheet plate, astm a240 type 310h stainless steel sheet plate, and astm a240 type 330 stainless steel sheet plate (when available).
Applications
Alloy 800 / SA240 Type 800 is widely used in high-temperature industrial applications. Typical applications of SA240 800 / Alloy 800 include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Heat Exchangers | Alloy 800 / SA240 800 heat exchanger tubesheets, shells and components |
| Petrochemical & Refining | SA240 800 furnace components, piping, reactors |
| Power Generation | Alloy 800 superheater and reheater components |
| Industrial Furnaces | SA240 800 radiant tubes, muffles, fixtures, retorts |
| Chemical Processing | Alloy 800 high-temperature process equipment |
| Heat Treatment Equipment | SA240 800 fixtures, baskets and furnace parts |
| Power & Energy | Alloy 800 components in high-temperature service |
Why Choose SHH STEEL
SHH STEEL is a China Mill-Direct Supply and Mill Direct Exporter of stainless steel and nickel alloy plate. We maintain long-term cooperation with major mills and supply Alloy 800 / SA240 Type 800 with the following advantages:
- Competitive mill-direct pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1)
- Flexible dimensions and surface finishes (including SA240 800 No.1 and Alloy 800 2B)
- Technical support for high-temperature material selection
- Reliable worldwide logistics and export documentation
FAQ
- Is there an official “Type 800” in ASME SA240?Strictly speaking, Alloy 800 (UNS N08800) is covered under ASTM B409 / ASME SB-409. However, it is frequently requested under the SA240 Type 800 designation in projects. SHH STEEL can supply material dual-certified or to the required specifications.
- What is the difference between Alloy 800, 800H and 800HT?Alloy 800 is the standard grade. Alloy 800H has controlled carbon and grain size for improved creep strength. Alloy 800HT has further optimized Al + Ti content for maximum high-temperature strength. SHH STEEL can supply all three variants according to project needs.
- Is Alloy 800 / SA240 Type 800 magnetic?Alloy 800 is the standard grade. Alloy 800H has controlled carbon and grain size for improved creep strength. Alloy 800HT has further optimized Al + Ti content for maximum high-temperature strength. SHH STEEL can supply all three variants according to project needs.
- Is Alloy 800 / SA240 Type 800 magnetic?It is generally non-magnetic in the annealed condition. SHH STEEL supplies fully annealed material.
- What is the density of Alloy 800?7.94 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
- Can SHH STEEL supply dual-certified material?Yes, SHH STEEL commonly supplies Alloy 800 with dual certification to ASTM B409 / ASME SB-409 and other required standards.
Conclusion
ASME SA240 Type 800 / Alloy 800 (UNS N08800) is a proven nickel-iron-chromium alloy that delivers excellent high-temperature strength, outstanding resistance to oxidation and carburization, and reliable performance in demanding industrial environments. It remains a preferred material for heat exchangers, furnace components, petrochemical equipment and power generation applications.
As a professional China Mill-Direct Supply and Mill Direct Exporter, SHH STEEL provides high-quality Alloy 800 / SA240 Type 800 plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including SA240 800 No.1 and Alloy 800 2B), Alloy 800H/800HT options, or a competitive quotation.
ASME SA240 800 Stainless Steel Plate, SA240 Type 800, Alloy 800 plate, Incoloy 800, UNS N08800, SA240 800 supplier
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