Incoloy 800HT Belleville disc springs
EN 16983ASTM B409
Incoloy 800HT disc springs put tightly controlled carbon and Al + Ti for creep duty into a flexing preload element. Working force, installed height and final material condition define the part more usefully than free diameter alone.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- Solution annealed (≥1149°C / 2100°F)
EN 10204 3.1 MTC + heat-number traceability
Which standard is on your order?
Raw Material Specifications
Dimension Reference
Heat Treatment
Solution annealedThe specified solution treatment develops the controlled grain structure needed for sustained high-temperature creep duty.
What we can make in Alloy 800HT
Single disc
Use under a fastener or in a preload mechanism when a short axial space must provide spring force. Select by load at working deflection, not by bore and outside diameter alone.
Series stack
Alternate disc orientation when a joint needs more travel to accommodate thermal movement or seating loss. Total travel increases at approximately the single-disc load; guides keep the stack aligned.
Parallel stack
Nest discs in the same orientation when the available travel is small but more spring force is needed. Load rises at approximately the single-disc deflection, with friction affecting the real load-deflection response.
- Form
- Conical disc
- Key dimensions
- Bore · Outside diameter · Thickness
- Spring definition
- Free height · Load–deflection
- Stacking
- Single · Series · Parallel
- Final condition
- Solution annealed (≥1149°C / 2100°F)
- Inspection
- Free height · Thickness · Load–deflection
Manufacturing route
Disc blanks are cut and formed to the required cone height; thickness and edge quality control stress distribution through the working travel.
Heat treatment & final condition
Solution annealing at a minimum of 1149°C (2100°F) establishes the coarse-grain condition used for creep resistance. The heat-treatment record and grain-size result identify this delivery state.
Working performance
Annealed corrosion-resistant stock is not automatically spring stock. The ordered temper or strengthening route must demonstrate the required recovery and load at working deflection.
Where 800HT fits — and what matters
Furnaces & Heat Treatment
Heat-treatment fixturesIncoloy 800HT disc spring / belleville washers form preload stacks in the bolted mounts of heat-treatment fixtures. Working deflection allows the stack to accommodate movement while maintaining the designed spring force. Hot dwell, thermal expansion and repeated furnace cycles set the working load.
Power & Turbines
Boiler-duct supports and hot auxiliary bracketsIncoloy 800HT disc spring / belleville washers form preload stacks in the bolted mounts of boiler-duct supports and hot auxiliary brackets. Working deflection allows the stack to accommodate movement while maintaining the designed spring force. Hot dwell and start-stop expansion act on the supported or moving component.
Chemical Processing
Reformer tube-support and heater fixturesIncoloy 800HT disc spring / belleville washers form preload stacks in the bolted mounts of reformer tube-support and heater fixtures. Working deflection allows the stack to accommodate movement while maintaining the designed spring force. These parts work in the heated equipment zone, where sustained loading and thermal expansion govern their section and clearance.
Same disc spring. Different material priorities.
Incoloy 800HT material dataIncoloy 800
UNS N08800- Carbon
- ≤0.10%
- What changes
- General heat and oxidation resistance; no grain-size requirement in the family comparison.
Incoloy 800H
UNS N08810- Carbon
- 0.05–0.10%
- What changes
- Controlled carbon and coarse-grain condition for creep and stress-rupture duty.
Incoloy 800HT
UNS N08811 · Current grade- Carbon
- 0.06–0.10%
- What changes
- Tighter carbon and Al + Ti control (0.85–1.20%), with solution treatment and coarse grain for creep duty.
From drawing to documented delivery
- 01Drawing & BOMForm, dimensions and quantity
- 02Material & formingGrade, heat and manufacturing route
- 03Final inspectionGeometry, threads and ordered tests
- 04Documents & dispatchLot records and identified packing
Order documents
- Material identity
- UNS N08811 · heat number · ordered condition
- Final-part acceptance
- UNS grade, carbon and alloy chemistry, solution-treatment record and ordered grain-size evidence. Load–deflection and permanent-set results for the specified spring geometry.
- Dimensional record
- Free height · Thickness · Load–deflection
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 800HT disc spring enquiry
Questions about 800HT disc spring / belleville washers
Can an alloy change preserve the same disc-spring rating?
Elastic modulus, yield behaviour and final condition influence the load–deflection curve. Recalculate and verify the working response for the selected alloy rather than carrying over a same-size steel disc’s rating.