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- NACE MR0175/ISO 15156-2
- NORSOK M-650
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- MERKBLATT AD 2000 W2/W7/W10
Incoloy 800H Data Sheet
This consolidated data sheet for Incoloy 800H (UNS N08810, Werkstoff 1.4876) and Incoloy 800HT (UNS N08811) summarises the chemistry, room-temperature mechanical envelope, elevated-temperature mechanical envelope, solution-anneal heat-treatment cycle and ASME Section II Part D Table 1A allowable design stress for the full 800H / 800HT product range supplied by TorqBolt to ASTM B407 (seamless pipe and tube), ASTM B408 (rod and bar), ASTM B409 (plate, sheet and strip), ASTM B514 (welded pipe) and ASTM B564 (forgings). The data here is consolidated from the Special Metals technical bulletin INCOLOY alloys 800H and 800HT, from the corresponding ASTM specifications and from ASME Section II Part D 2023 edition; for the project-specific design-stress lookup at any temperature from 100 deg F to 1500 deg F, see the ASME design stress tables page. A downloadable PDF version of this data sheet is available on request via the sales desk.
Chemical Composition (ASTM B407 / B408 / B409 / B564)
| Element | 800H (N08810), percent | 800HT (N08811), percent |
|---|---|---|
| Nickel (Ni) | 30.0 to 35.0 | 30.0 to 35.0 |
| Chromium (Cr) | 19.0 to 23.0 | 19.0 to 23.0 |
| Iron (Fe) | balance (~39.5) | balance (~39.5) |
| Carbon (C) | 0.05 to 0.10 | 0.06 to 0.10 |
| Aluminium (Al) | 0.15 to 0.60 | 0.25 to 0.60 |
| Titanium (Ti) | 0.15 to 0.60 | 0.25 to 0.60 |
| Al + Ti combined | 0.30 to 1.20 | 0.85 to 1.20 |
| Manganese (Mn) | 1.5 maximum | 1.5 maximum |
| Silicon (Si) | 1.0 maximum | 1.0 maximum |
| Copper (Cu) | 0.75 maximum | 0.75 maximum |
| Sulfur (S) | 0.015 maximum | 0.015 maximum |
The defining chemistry difference between 800H and 800HT is the combined Al+Ti window: 0.30 to 1.20 percent for 800H (gives controlled-carbon creep performance to 815 deg C) versus 0.85 to 1.20 percent for 800HT (gives higher creep-rupture strength for service to 982 deg C). For the full discussion of the Al + Ti chemistry control window, see chemical composition.
Room-Temperature Mechanical Properties (Solution-Annealed)
| Property | 800H (B407 / B408 / B409 / B564) | 800HT (B407 / B408 / B409 / B564) |
|---|---|---|
| Tensile strength (UTS) | 450 MPa min (65 ksi) | 450 MPa min (65 ksi) |
| Yield strength (0.2 percent offset) | 170 MPa min (25 ksi) | 170 MPa min (25 ksi) |
| Elongation (in 4D) | 30 percent min | 30 percent min |
| Hardness | Rockwell B 70 to 90 (192 HV max equivalent) | Rockwell B 70 to 90 |
| Grain size (per ASTM E112) | ASTM 5 or coarser | ASTM 5 or coarser |
For the elevated-temperature mechanical envelope (yield, UTS and creep-rupture from 100 deg F to 1500 deg F), see mechanical properties and creep rupture strength.
Heat Treatment (ASTM B407 / B564 Acceptance Cycle)
| Step | Temperature | Time | Cooling |
|---|---|---|---|
| Solution anneal (mandatory) | 2050 deg F (1121 deg C) minimum | 1 hour per 25 mm of section | Accelerated air cool (water-quench on heavy sections) |
| Stress relief (call-out) | 870 to 900 deg C | 1 hour per 25 mm | Slow furnace cool |
The 2050 deg F solution anneal is mandatory under ASTM B407 / B408 / B409 / B564 for 800H to dissolve chromium carbides, lock in ASTM grain size 5 or coarser and deliver the high-temperature creep performance that defines the grade. Service heat-treatment (sensitisation re-treatment, post-weld stress relief) follows the project welding procedure. See heat treatment for the full discussion.
ASME Section II Part D Design Stress (Selected Temperatures)
The table below lists the ASME Section II Part D Table 1A allowable design stress for 800H (UNS N08810) at selected temperatures. The break point between time-independent (yield-limited) and time-dependent (creep-limited) design typically falls around 1000 deg F for 800H. For the full table from 100 deg F to 1500 deg F in 100 deg F increments, see the ASME design stress tables page.
| Temperature | 800H Allowable Stress (ksi) | 800H Allowable Stress (MPa) |
|---|---|---|
| 100 deg F (38 deg C) | 20.0 | 138 |
| 500 deg F (260 deg C) | 17.7 | 122 |
| 1000 deg F (538 deg C) | 13.8 | 95 |
| 1100 deg F (593 deg C) [creep break] | 11.5 | 79 |
| 1200 deg F (649 deg C) | 8.6 | 59 |
| 1300 deg F (704 deg C) | 6.0 | 41 |
| 1400 deg F (760 deg C) | 3.7 | 26 |
| 1500 deg F (815 deg C) [800H max] | 2.5 | 17 |
Values consolidated from ASME Section II Part D 2023 edition Table 1A for SB-407 / SB-409 / SB-564 N08810. [verify exact values from current ASME edition for project-specific design.]
Applicable Standards
- ASTM B407 / ASME SB-407: Seamless pipe and tube - see ASTM B407.
- ASTM B408 / ASME SB-408: Rod and bar - see ASTM B408.
- ASTM B409 / ASME SB-409: Plate, sheet and strip - see ASTM B409.
- ASTM B514 / ASME SB-514: Welded pipe - see welded pipe.
- ASTM B564 / ASME SB-564: Forgings - see ASTM B564.
- ASME Section VIII Division 1: Pressure-vessel code, max design temperature 815 deg C - see ASME Section VIII.
- API 660: Shell-and-tube heat exchangers - see API 660.
- EN 10204: Type 3.1 (default) or type 3.2 (call-out) inspection certification.
Physical Properties (Solution-Annealed, Room Temperature)
| Property | Value |
|---|---|
| Density | 7.94 g/cm3 (0.287 lb/in3) |
| Modulus of elasticity (RT) | 196 GPa (28.5 x 10E6 psi) |
| Coefficient of thermal expansion (20 to 100 deg C) | 14.4 x 10E-6 per K |
| Thermal conductivity (RT) | 11.5 W/m.K (80 BTU.in/hr.ft2.degF) |
| Specific heat (RT) | 460 J/kg.K (0.11 BTU/lb.degF) |
| Electrical resistivity (RT) | 0.99 micro-ohm.m (596 ohm-cmil/ft) |
| Melting range | 1357 to 1385 deg C (2475 to 2525 deg F) |
| Magnetic permeability (RT) | 1.014 max (essentially non-magnetic) |
For the full thermal-expansion curve from 20 deg C to 1000 deg C and the density / thermal-conductivity behaviour with temperature, see density and physical properties and thermal expansion.
Weldability Summary
800H welds readily by GTAW, GMAW, SAW and SMAW with matching nickel-base filler. Standard fillers: ERNiCrFe-2 (AWS A5.14) or ERNiCrFe-7 for GTAW / GMAW / SAW; ENiCrFe-2 or ENiCrFe-3 (AWS A5.11) for SMAW. Preheat is not required. Interpass temperature is held below 175 deg C (350 deg F) to limit grain coarsening in the HAZ. Post-weld solution anneal at 2050 deg F is supplied on call-out for fabrications that require maximum creep performance. For the full discussion of welding procedures, filler selection and hot-cracking mitigation, see weldability and welding procedures.
Data Sheet FAQ
Q. Where do the ASTM mechanical and ASME design-stress values come from?
Mechanical envelope values are taken from the relevant ASTM B407 / B408 / B409 / B564 specifications. ASME Section II Part D Table 1A design stress values are from the 2023 edition for SB-407 / SB-409 / SB-564 N08810. For project-specific design always verify against the current ASME edition that the project Material Specification References.
Q. Are the data-sheet values the same for 800H and 800HT?
Chemistry differs (combined Al+Ti window 0.30 to 1.20 percent for 800H, 0.85 to 1.20 percent for 800HT). Room-temperature mechanical envelope is essentially identical. Elevated-temperature creep-rupture is higher for 800HT, qualifying that grade for sustained service to 982 deg C (1800 deg F). See 800 vs 800H vs 800HT comparison for the side-by-side.
Q. Do you supply hot-tensile data on each heat?
Hot-tensile data is not part of the standard B407 / B408 / B409 / B564 acceptance test programme; the room-temperature tensile + yield + elongation results are reported on the EN 10204 certificate. Hot-tensile testing (typically at 540 deg C, 650 deg C and 815 deg C) is supplied on call-out for refinery / petrochemical projects and added to the EN 10204 type 3.1 or 3.2 certificate.
Q. How often is this data sheet refreshed?
The data sheet is reviewed against the current ASME Section II Part D and the latest ASTM B-series specifications at least annually, and re-issued when either source changes the chemistry, mechanical or design-stress values.
Q. Can you supply a PDF version of this data sheet on your letterhead?
Yes. A PDF version with TorqBolt branding and the issue date is available on request from the sales desk; the PDF is signed by the QA-QC manager and dated to track the data revision.
Request the Data Sheet PDF
Request the Incoloy 800H + 800HT data sheet as a signed PDF by contacting the TorqBolt sales desk. Include the project name and the intended product form (pipe / tube / plate / bar / forging / fittings / flanges / fasteners) so the PDF version most relevant to your application is sent.
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