Alloy 800H / Incoloy 800H
Alloy 800H is the controlled-carbon, controlled-grain-size version of Alloy 800 developed for improved creep and stress-rupture strength at elevated temperature.
Alloy 800H / Incoloy 800H Information
Alloy 800H is the controlled-carbon, controlled-grain-size version of Alloy 800 developed for improved creep and stress-rupture strength at elevated temperature.
Metallic winding and compatible ring components where service conditions are suitable.
| UNS Number | N08810 |
|---|---|
| Correct Trade Family | INCOLOY alloy 800H |
| Material Type | Controlled-carbon Ni-Fe-Cr high-temperature alloy |
| Common / Applicable Specification | ASTM B409 / applicable 800H specification |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
Alloy 800H / Incoloy 800H Chemical Composition
Reference composition limits are shown below. Exact requirements should be confirmed against the applicable product specification and certified material documentation.
| Element / Constituent | Symbol | Composition / Information |
|---|---|---|
| Nickel | Ni | 30.0–35.0 |
| Chromium | Cr | 19.0–23.0 |
| Iron | Fe | Balance |
| Carbon | C | 0.05–0.10 |
| Manganese | Mn | 1.50 max. |
| Silicon | Si | 1.00 max. |
| Aluminium | Al | 0.15–0.60 |
| Titanium | Ti | 0.15–0.60 |
Alloy 800H / Incoloy 800H Mechanical Properties
Reference room-temperature properties are shown for a commonly supplied condition. Exact requirements depend on product form, size, heat treatment and governing specification.
| Property | Reference Value | Unit / Basis |
|---|---|---|
| Tensile Strength | ≈450–520 min. | MPa |
| 0.2% Offset Yield Strength | ≈170–205 min. | MPa |
| Elongation | ≈30 min. | % |
Values shown are engineering reference data, not universal design allowables. Final procurement and design must use the governing specification, exact product form/condition and certified material test documentation.
Alloy 800H / Incoloy 800H Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 7.94 g/cm³ |
|---|---|
| Structure | Austenitic Ni-Fe-Cr alloy |
| High-Temperature Behaviour | Improved creep and stress-rupture properties versus standard Alloy 800. |
| Heat Treatment | Requires controlled solution treatment / grain size under applicable specifications. |
| Service Selection | Use certified 800H material when creep properties at elevated temperature are part of the design basis. |
Specify Alloy 800H for your gasket
Share your gasket dimensions, service conditions and quantity for Alloy 800H material options and pricing.