Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Incoloy 800H Plate
Incoloy 800H plate (UNS N08810, Werkstoff 1.4876) is supplied to ASTM B409 / ASME SB-409 in thickness 4.75 mm to 100 mm with widths up to 2500 mm and lengths to 12 m at qualified Special Metals, VDM, Outokumpu and ATI mill sources. The plate is hot-rolled from a continuously cast slab or VIM-ESR ingot, solution-annealed at 2050 deg F (1121 deg C) and quench-cooled to lock in ASTM grain size 5 or coarser for sustained design service to 815 deg C (1500 deg F) under ASME Section VIII Division 1. Typical end-uses include pressure-vessel shells and heads (rolled to cylinder, dished by hot-form), heat-exchanger tubesheets and floating-head closures, fired-heater convection bank baffles, ASME Section I steam-drum repair patches and fabricated furnace components. Each plate carries an EN 10204 type 3.1 mill certificate by default with heat-number chemistry per B409 ranges, solution-anneal cycle, room-temperature mechanical results per ASTM A370, grain-size verification per ASTM E112, ultrasonic inspection per ASTM A578 and dimensional report; type 3.2 third-party witness from Lloyds Register, DNV, BV, SGS or TUV is supplied on call-out for pressure-vessel and refinery procurement.
Plate Dimensions per ASTM B409
| Property | Range |
|---|---|
| Thickness range | 4.75 mm to 100 mm |
| Width range | up to 2500 mm |
| Length range | up to 12 m |
| Thickness tolerance | per ASTM B409 paragraph 8 (typically +0.45 / -0.25 mm at 10 mm thick) |
| Width tolerance | +25 / -0 mm (mill-edge); per A480 (machined-edge) |
| Flatness | per ASTM A480 commercial flatness; quarter-hard flatness on call-out |
| Edge condition | Mill edge (default), trimmed edge, machined edge per PO |
| Surface finish | Hot-rolled and pickled (HRAP); cold-rolled and bright-annealed (CRBA) on call-out for sheet |
Plate Manufacturing Route
- Mill source verification: Special Metals, VDM, Outokumpu or ATI. Verify mill 3.1 cert + chemistry + traceability.
- Slab / ingot heat: 800H slab from continuous-cast route or VIM-ESR ingot for premium grades.
- Hot-roll: Reversing 4-high hot-mill reduces slab to plate at 1180 to 1200 deg C.
- Solution anneal: 2050 deg F + accelerated air-cool per B409.
- Pickle: Nitric-HF pickle removes scale; alternatively shot-blast + acid passivation.
- Level + flatten: Multi-roll leveller to commercial flatness (call out tighter flatness if required).
- UT: ASTM A578 ultrasonic per project acceptance level (typically level A or B for ASME Section VIII shell plate).
- Edge trim: Mill edge by default; trimmed or machined edge per PO.
- Marking: Heat number, B409, grade N08810, plate dimensions, mill mark per ASTM B409 paragraph 13.
Sizes Stocked and Lead Times
| Thickness band | Width | Stock status | Lead time |
|---|---|---|---|
| 5 to 16 mm | 1500 / 2000 mm | Held in stock | 3 to 4 weeks |
| 20 to 40 mm | 1500 / 2000 mm | Held in stock | 4 to 6 weeks |
| 50 to 80 mm | 1500 / 2000 mm | Indent from mill | 12 to 16 weeks |
| 80 to 100 mm | 1500 / 2000 / 2500 mm | Indent from mill | 14 to 18 weeks |
Plate-Specific Inspection and Marking
- Ultrasonic per ASTM A578 - level A (no recordable indication) or level B (no indication above flat-bottom-hole reference), project-specified.
- Liquid penetrant per ASTM E165 on edges and surface (call-out).
- Tensile + yield + elongation per ASTM A370.
- Grain size per ASTM E112 on coupon per heat / lot. Acceptance: grain size 5 or coarser.
- Hardness per ASTM E18 - Rockwell B 70 to 90 in solution-annealed condition.
- Surface roughness: HRAP surface typically 6.3 micron Ra (250 AARH); finer finish on call-out.
- Marking: per ASTM B409 paragraph 13 - grade, dimensions, heat number, mill mark, project tag on call-out.
Typical Plate Service Conditions
| End-use | Service temperature | Companion application |
|---|---|---|
| ASME Section VIII pressure vessel shell | up to 815 deg C | ASME VIII vessels |
| Heat exchanger tubesheet | up to 540 deg C | Heat exchanger tubes |
| Fired-heater convection bank baffle | 650 to 815 deg C | Radiant tubes |
| Steam-drum repair patch | up to 540 deg C steam | Steam superheaters |
| Fabricated furnace components | up to 982 deg C oxidation | Oxidation resistance |
Companion Forms
800H plate rolls into B514 welded pipe for NPS 14 inch and larger, drills into tubesheets for shell-and-tube exchangers, and is hot-formed into dished pressure-vessel heads. For thinner gauges (below 4.75 mm), see 800H sheet. For parent chemistry and design-stress curves, see chemical composition and the ASME design stress tables.
Engineering Guidance for Plate Specification
When specifying 800H plate, the four-step decision sequence runs through thickness, width, ultrasonic acceptance level, and certification class. Thickness is driven by the wall calculation under ASME Section VIII Division 1 paragraph UG-27 using the allowable design stress from Section II Part D Table 1A at the design temperature plus the corrosion allowance and the manufacturing under-tolerance per B409. Width is set by the rolled-cylinder layout for a pressure-vessel shell or by the tubesheet OD for a heat-exchanger application; widths up to 2500 mm are available, which covers most shop-fabricated vessel diameters without longitudinal-seam doubling. Ultrasonic acceptance level (ASTM A578 level A, B, or B with supplemental S2) is set by the project quality plan; level B is the typical default for ASME Section VIII Division 1 shell plate. Certification class (EN 10204 type 3.1 versus 3.2) is set by the procurement specification; refinery and LNG projects typically call out 3.2 with third-party witness, while utility and process-plant projects accept 3.1. The TorqBolt sales desk can run through these four steps with the project material engineer and confirm the supply specification before order placement.
Plate FAQ
Q. What is the maximum plate thickness available in 800H?
The standard mill envelope tops out at 100 mm. Above 100 mm the material is normally supplied as forged block per ASTM B564 rather than rolled plate; the forging route gives better through-thickness mechanical properties at the sacrifice of width.
Q. What ASTM A578 acceptance level should I specify for ASME Section VIII shell plate?
ASTM A578 level B (no recordable indication above the calibration FBH) is the typical default for ASME Section VIII Division 1 shell plate. Level A (no recordable indication at all) is specified for hydrogen-service or sour-service vessels; supplemental level S2 with 100 percent edge UT is specified for very-high-pressure service.
Q. Do you supply 800H plate cut-to-shape (waterjet or plasma)?
Yes on call-out. Waterjet cutting is preferred to avoid the heat-affected zone that plasma or laser cutting produces in the cut edge. After waterjet or plasma cutting, the cut edge is dressed and PT-inspected per ASTM E165 if the cut edge will be welded.
Q. Can you supply 800H plate with NACE MR0175 compliance for sour service?
Yes. The 800H heat treatment (solution-anneal at 2050 deg F + accelerated cool) delivers hardness Rockwell B 70 to 90 which sits well below the NACE MR0175 / ISO 15156 limit of 22 HRC (about 237 HV) for nickel-iron-chromium alloys. The plate is supplied with the NACE MR0175 compliance statement on the EN 10204 certificate.
Q. Do you supply 800H plate with hot-roll-and-pickle (HRAP) finish or cold-roll-and-bright-anneal (CRBA)?
Plate (4.75 mm and thicker) is supplied HRAP as standard. Cold-roll-and-bright-anneal finish is available on call-out for thinner gauges (below 6 mm); see 800H sheet for the CRBA range.
Request a Quote on Incoloy 800H Plate
Send the project drawing or cut list, thickness, width, length, edge condition, UT acceptance level, certification class (EN 10204 3.1 or 3.2) and any waterjet-cut / PMI / NACE MR0175 add-ons to our sales desk.
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