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 Forgings
TorqBolt-manufactured Incoloy 800H forgings (UNS N08810, Werkstoff 1.4876) are produced to ASTM B564 / ASME SB-564 in open-die and closed-die routes up to a single-piece weight of 1500 kg, covering pressure-vessel heads, subsea connector blanks, valve bodies, reformer pigtail return-bend forgings, fired-heater header rings and centrifugal-compressor wheel blanks for sustained service to 815 deg C (1500 deg F). The forging program runs through a four-station route of billet preparation, hot upset on a 2500-tonne hydraulic press, finish forge on a 1600-tonne press and solution anneal at 2050 deg F (1121 deg C) followed by accelerated air cool to lock in ASTM grain size 5 or coarser. Every forging carries a B564 type 3.1 certificate by default with heat number, ladle analysis, product chemistry, grain-size verification, mechanical test results from a sacrificial prolongation and ultrasonic examination per ASTM A388. EN 10204 type 3.2 with Lloyds Register, DNV, BV, SGS or TUV witness is supplied on call-out for pressure-vessel and subsea procurement.
Forging-Specific Dimensions, Tolerances and Mass Limits
The size envelope is driven by hydraulic-press capacity, billet pre-heat homogeneity and the cooling rate that the section thickness allows during solution-anneal quench. The table below summarises the practical forging envelope at the TorqBolt Rajkot plant for Incoloy 800H per ASTM B564 stock route.
| Forging form | Maximum diameter | Maximum length / height | Single-piece mass | Tolerance class |
|---|---|---|---|---|
| Open-die disc / hub | 1200 mm | 400 mm thick | 1500 kg | ASTM A788 class A / B (machining allowance 6 to 25 mm/side) |
| Open-die ring (seamless rolled) | OD 1800 mm / ID 1200 mm | 500 mm axial height | 1200 kg | ASTM A788 / customer drawing |
| Open-die shaft / billet | OD 350 mm | 3000 mm | 800 kg | Machining allowance 4 to 12 mm/side |
| Closed-die connector block | 500 x 500 mm footprint | 300 mm height | 400 kg | Near-net shape per project drawing |
| Reformer pigtail return-bend | OD per project | 1200 mm overall | 250 kg | Per furnace OEM drawing |
Forging Manufacturing Route at TorqBolt
The 800H forging sequence at the Rajkot plant runs through eight stations to guarantee chemistry control, structural soundness and the solution-annealed grain size needed for ASME Section VIII service. Each step is recorded in the production traveller against the heat number and the forging serial number, and the resulting record set populates the consolidated datasheet packet shipped with the part.
- Billet receipt + verification: Incoming Incoloy 800H billet from qualified mill source (Special Metals, Outokumpu, VDM, ATI). Verify chemistry to B564 chemistry ranges, mill 3.1 certificate, heat number traceability, ultrasonic soundness per ASTM A388.
- Cut + pre-heat: Billet sectioned to forging mass on Wagner saw. Pre-heat in gas-fired bogie furnace to 1180 to 1200 deg C, soak 1 hour per 25 mm of section thickness, temperature held with two redundant K-type thermocouples calibrated to ASTM E220.
- Upset forge: 2500-tonne hydraulic press reduces billet height 50 to 70 percent to break down cast structure. Reheat after 200 deg C drop.
- Finish forge: 1600-tonne press shapes near-net contour per drawing. Total reduction target 4:1 minimum on cast structure for ASTM A788 forging grade.
- Rough machine: Lathe + mill to remove forging scale, expose surface for NDT. Machining allowance 4 to 12 mm/side retained for finish machining.
- Solution anneal: Electric resistance furnace to 2050 deg F (1121 deg C), soak 1 hour per 25 mm of section, accelerated air cool. This step is the ASTM B564 / ASME SB-564 acceptance heat treatment that delivers grain size 5 or coarser and dissolves chromium carbides for creep performance.
- NDT + dimensional: Ultrasonic per ASTM A388 (compression and shear), dye-pen per ASTM E165, hardness per ASTM E18, dimensional per drawing.
- Marking + certification: Heat number, drawing number, B564 grade, serial number and lot number low-stress die-stamped on body. EN 10204 type 3.1 (default) or 3.2 (on call-out) certificate.
Sizes Stocked and Lead Times
Standard billet stock is held at the Rajkot plant in 60 mm, 100 mm, 150 mm, 200 mm and 300 mm rounds against ASTM B408 / B564 chemistry, supporting a 4 to 6 week lead time on disc, hub and ring forgings up to 500 kg piece mass. Larger forgings (500 to 1500 kg) and closed-die parts requiring dedicated tooling run on a 10 to 14 week lead time from PO release.
| Forging class | Piece mass | Stock billet held | Lead time (after PO) |
|---|---|---|---|
| Small disc / hub | up to 100 kg | Yes (60 to 200 mm rounds) | 3 to 4 weeks |
| Medium ring / shaft | 100 to 500 kg | Yes (200 to 300 mm rounds) | 4 to 6 weeks |
| Large ring / hub | 500 to 1000 kg | Mill order required | 8 to 12 weeks |
| Very large / closed-die | 1000 to 1500 kg | Mill order + tooling | 10 to 14 weeks |
Forging-Specific Inspection and Marking
Every Incoloy 800H forging is examined to a multi-method NDT plan that confirms internal soundness, surface condition and dimensional fitness for service. The full plan is locked in the production traveller before solution anneal and the results are recorded on the inspection record that ships with the part.
- Ultrasonic examination per ASTM A388 with straight-beam and angle-beam transducers. Acceptance criteria: no recordable indication greater than the flat-bottom-hole reference standard agreed at PO stage (typical 3.0 mm FBH for pressure-vessel forgings, 1.6 mm FBH for subsea connectors).
- Liquid penetrant inspection per ASTM E165 type II (water-washable) or type III (solvent-removable) after solution anneal. No linear or rounded indication above 1.6 mm.
- Hardness survey per ASTM E18, typically Rockwell B 70 to 90 in solution-annealed condition.
- Grain-size verification per ASTM E112 on a sacrificial prolongation. Minimum ASTM grain size 5 (coarser permitted).
- Mechanical test per ASTM A370 on a sacrificial prolongation: room-temp tensile, room-temp yield 0.2 percent, elongation in 4D and reduction of area. Reported on the mechanical-properties certificate.
- Marking: low-stress die-stamp with heat number, B564 grade ("UNS N08810 B564"), drawing or part number, serial number, TorqBolt mark and inspection stamp.
Typical Forging Service Conditions
The applications that consume Incoloy 800H forgings sit at the intersection of high temperature, corrosive process gas and pressure-vessel code compliance. The list below maps the most common forging end-uses against the design-pressure and design-temperature windows we see on procurement drawings.
| End-use forging | Service temperature | Design pressure | Companion application page |
|---|---|---|---|
| Reformer pigtail return bends | 815 to 900 deg C | 30 to 45 bar | Reformer pigtails |
| Ethylene cracker header / outlet forgings | 850 to 1050 deg C tube-skin | 4 to 6 bar | Ethylene cracker tubes |
| Fired-heater radiant section header rings | 650 to 815 deg C | 50 to 80 bar | Radiant tubes |
| ASME Section VIII pressure-vessel heads | up to 815 deg C | per UG-22 design | ASME VIII vessels |
| Steam superheater drum forgings | 540 to 650 deg C | 120 to 180 bar | Steam superheaters |
Companion Forms and Reference Links
Incoloy 800H forgings are normally specified alongside companion forms drawn from the same heat envelope: see flanges machined from forged blanks, buttweld and socketweld fittings, seamless pipe and round bar stock for valve trim. The chemistry envelope is identical across all wrought forms per B564 and B407 (see chemical composition); only the heat-treatment cycle and the mechanical-test position differ. For the full design-stress curve to 1500 deg F under ASME Section II Part D Table 1A, see the ASME design stress tables.
Forgings FAQ
Q. What is the largest single forging that TorqBolt can produce in Incoloy 800H?
Single-piece mass limit is 1500 kg on the 2500-tonne hydraulic press. Above 1500 kg the forging is built as a welded subassembly from two or more forged sections per a qualified procedure under ASME Section IX.
Q. Is ASTM B564 the same as ASME SB-564?
Yes. ASME SB-564 is the boiler-and-pressure-vessel-code adoption of ASTM B564 with no chemistry or mechanical difference for UNS N08810. Forgings certified to ASTM B564 are acceptable for ASME Section VIII Division 1 service at design temperatures up to 815 deg C (1500 deg F).
Q. Do you supply forgings in the as-forged condition without solution anneal?
No. ASTM B564 requires solution anneal at 2050 deg F minimum followed by accelerated cool for UNS N08810 to lock in ASTM grain size 5 or coarser. As-forged 800H lacks the grain coarsening needed for sustained creep performance and is outside the B564 / SB-564 acceptance envelope.
Q. What ultrasonic acceptance level should I specify for subsea connector forgings?
Subsea connector blanks are normally specified to a 1.6 mm flat-bottom-hole reference per ASTM A388 with 100 percent volume coverage and no recordable indication above the FBH. This is tighter than the typical 3.0 mm FBH level used for general ASME Section VIII pressure-vessel forgings.
Q. How do you handle forgings that need post-weld build-up of overlay?
800H forgings that require nickel-base overlay (Inconel 625 or 825 weld overlay) are forged, rough-machined, solution-annealed, then overlay-welded per a Section IX qualified procedure, stress-relieved at 605 deg C maximum, machined and finally PT-inspected per ASTM E165 with the full overlay-weld record annexed to the B564 type 3.1 certificate.
Request a Quote on Incoloy 800H Forgings
Send a drawing, project standard (ASTM B564 / ASME SB-564 / customer spec), quantity, NDT class and certification requirement (EN 10204 type 3.1 or 3.2) to our sales desk. Standard discs, hubs and rings under 500 kg piece mass ship in 4 to 6 weeks against held billet stock; larger or closed-die forgings run on 8 to 14 week lead times depending on tooling and mill billet order.
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