ASTM B409 Incoloy 800H UNS N08810 Sheet and Plate
UNS N08810 nickel-iron-chromium flat products for elevated-temperature equipment requiring oxidation resistance and improved creep strength.
For a faster quotation: send thickness × width × length, quantity, specification, delivery condition and destination.
ASTM B409 Incoloy 800H UNS N08810 sheet and plate are nickel-iron-chromium flat products intended for elevated-temperature structures and process equipment. Alloy 800H uses controlled carbon and a solution-treated grain structure to improve creep and rupture strength compared with standard Alloy 800. Final selection must consider temperature, atmosphere, stress, fabrication route and the applicable design code.
Product Overview
Incoloy 800H is designated UNS N08810 and W.Nr. 1.4958. ASTM B409 and ASME SB-409 are common procurement references for sheet and plate. The alloy combines nickel for metallurgical stability, chromium for oxidation resistance and iron as the principal balance. It is often considered for furnace, petrochemical and thermal-processing components that need sustained high-temperature strength.
800H is not interchangeable with every Alloy 800 or 800HT requirement. Chemistry limits, heat treatment, grain structure and code acceptance must be checked against the purchase specification. Actual heat analysis and reported mechanical properties shall be confirmed by the MTC.
Product Specifications
| Item | Procurement Reference |
|---|---|
| Material | Incoloy 800H nickel-iron-chromium alloy |
| UNS / W.Nr. | N08810 / 1.4958 |
| Product Form | Sheet and plate |
| Applicable Standard | ASTM B409 / ASME SB-409; other requirements subject to specification review |
| Delivery Condition | Solution-treated condition appropriate to Alloy 800H; confirm the required condition and code |
| Dimensions | Thickness, width and length according to customer requirements and confirmed production availability |
| Surface / Processing | Hot rolled, descaled or pickled; leveling and cut-to-size available when specified |
| Documentation | MTC and agreed inspection documentation according to purchase requirements |
Key Material Features
- Improved high-temperature strength: controlled carbon and heat treatment support creep and rupture performance above the range normally associated with standard Alloy 800.
- Oxidation resistance: chromium supports protective scale formation in many oxidizing environments.
- Carburization resistance: nickel and chromium contribute useful resistance in suitable furnace and petrochemical atmospheres.
- Fabricability: sheet and plate can be formed, welded and machined using qualified nickel-alloy procedures.
- Traceable procurement: grade, heat number, condition and test results should be checked against the MTC and order specification.
Typical Chemical Composition
The values below are typical specification references for UNS N08810. Requirements can vary by document and edition; actual values shall be confirmed by the MTC.
| Element | Ni | Cr | Fe | C | Al | Ti | Mn | Si | Cu | S |
|---|---|---|---|---|---|---|---|---|---|---|
| Typical reference, % | 30.0–35.0 | 19.0–23.0 | Balance | 0.05–0.10 | 0.15–0.60 | 0.15–0.60 | ≤1.50 | ≤1.00 | ≤0.75 | ≤0.015 |
High-Temperature Selection
Alloy 800H is selected primarily for long-term elevated-temperature performance, not maximum room-temperature strength. Properties depend on thickness, solution treatment, grain structure and test temperature. Engineering values should come from the governing standard and design code rather than a generic website table.
For cyclic service, thermal expansion, restraint, weld geometry and temperature gradients also require review. Resistance reported in one furnace gas or process atmosphere should not be assumed for a different gas chemistry, molten salt or aqueous corrosive environment.
Sheet and Plate Processing
| Process | Purpose | Purchasing Note |
|---|---|---|
| Hot Rolled and Pickled | General plate fabrication | Confirm surface acceptance and thickness tolerance |
| Cut-to-Size | Reduce fabrication preparation | Provide drawing dimensions and tolerance |
| Leveling | Improve flatness | State the required flatness standard |
| Machined Edges | Prepare for welding or assembly | Define edge geometry and machining allowance |
| Surface Finishing | Meet cleaning or fabrication needs | Availability must be confirmed for the requested size |
Manufacturing Process
Typical flat-product flow is Melting → Slab Processing → Hot Rolling → Solution Heat Treatment → Descaling / Pickling → Leveling → Cutting → Inspection. The exact route depends on mill practice and plate thickness. Heat treatment is essential because chemistry alone does not establish the intended 800H grain structure and delivery condition.
800 vs 800H vs 800HT vs 825
| Grade | Main Feature | Performance Focus | Relative Cost | Typical Selection |
|---|---|---|---|---|
| Incoloy 800 / UNS N08800 | General oxidation and carburization resistance | General elevated-temperature fabrication | Lower | Where 800H creep requirements are not specified |
| Incoloy 800H / UNS N08810 | Controlled carbon and grain structure | Improved creep and rupture strength | Medium | High-temperature pressure and process components |
| Incoloy 800HT / UNS N08811 | Tighter carbon, aluminum and titanium control | Long-term high-temperature strength | Medium | When the specification explicitly requires 800HT |
| Incoloy 825 / UNS N08825 | Molybdenum and copper additions | Aqueous corrosion resistance | Higher | Acid and wet-corrosion service when appropriate |
Applications
- Furnace components: sheet and plate can be fabricated into baffles, liners and supports exposed to sustained heat.
- Petrochemical heaters and reformers: the alloy may be selected where creep strength and process-atmosphere compatibility are required.
- Heat exchangers and process equipment: used when temperature and environment match Alloy 800H capabilities.
- Power-generation and thermal equipment: considered for fabricated parts exposed to heat and structural loading.
- High-temperature ducting and supports: flat products are practical for cut, formed and welded assemblies.
These are typical application areas, not automatic approvals. Suitability must be confirmed for actual temperature, atmosphere, load, fabrication procedure and design code.
Packaging & Delivery Protection
Packaging is selected according to product form, dimensions, surface condition and transport route. Final packing requirements should be confirmed in the purchase order.
- Sheet protection: interleaving, protective film or moisture-resistant wrapping can be specified when surface preservation is required.
- Plate handling: suitable pallets or skids, edge protection and secure strapping are selected according to plate dimensions and shipment method.
- Identification: package and item marking can follow the confirmed purchase order, heat number and document requirements.
- Special requirements: export packing, lifting points and other project-specific instructions must be stated before order confirmation.
Actual packaging details are confirmed against product size, quantity, destination and customer specification before shipment.
Test Report
Inspection and Quality Control
- Heat number and MTC review
- Chemical analysis according to the applicable specification
- PMI available when specified; PMI does not replace laboratory chemical analysis
- Thickness, width, length, flatness and dimensional inspection
- Surface inspection against the agreed finish
- Mechanical testing and hardness review as required
- Ultrasonic testing available when specified and technically applicable
Additional testing and third-party inspection must be agreed before quotation. No test should be represented as completed until supported by the applicable report.
Fabrication Guidance
Nickel alloys work-harden more rapidly than carbon steel and need suitable tooling, cutting parameters and rigid machine setup. Forming procedures should account for springback. Welding consumables and procedures must match the design temperature, code and service environment. Tools and work surfaces should be protected from contamination, and any post-fabrication cleaning or heat treatment should be defined in the fabrication specification.
Why Choose SASA ALLOY?
- Customized dimensions subject to production review
- Cut-to-size and processing coordination according to drawings
- Material traceability and MTC documentation for the agreed supply
- EN 10204 3.1 documentation when applicable and specified
- Inspection coordination and export packaging according to order requirements
- Review of grade, standard, product form and delivery condition before quotation
Technical FAQ
What standard applies to Incoloy 800H sheet and plate?
ASTM B409 and ASME SB-409 are common references. Confirm the project specification and edition before supply.
How does 800H differ from 800HT?
Both are high-temperature grades. 800HT uses tighter carbon, aluminum and titanium controls; use the grade explicitly required by the project specification.
What dimensions can be supplied?
Dimensions depend on thickness, mill route and production availability. Submit thickness, width, length, tolerance and quantity for confirmation.
Can plate be cut or machined?
Cutting, leveling and selected machining can be reviewed against the drawing, tolerance and quantity.
What inspections are available?
Dimensional and surface inspection apply to the agreed product. PMI, ultrasonic testing and additional inspection are available when specified.
Can an MTC be provided?
Material documentation can be supplied according to the agreed purchase requirements. State the certificate type before quotation.
What is required for quotation?
Provide specification, UNS grade, dimensions, quantity, condition, surface, tolerance, testing, documentation, destination and schedule.
Related Technical News
For grade selection between Alloy 800, 800H and 800HT, read our engineering comparison: Incoloy 800/800H/800HT: Differences for Heat Exchangers and Furnaces.
Related Incoloy 800H Products
Review the Incoloy 800H alloy overview, Incoloy 800H round bar and Incoloy 800/800H/800HT pipe and tube for other product forms.
