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 Machined Components
TorqBolt-manufactured Incoloy 800H machined components (UNS N08810, Werkstoff 1.4876) cover subsea connector bodies, hydrogen-service valve spindles and stems, reformer pigtail finish-machined assemblies, high-temperature pump shafts and impellers, ASME Section VIII vessel internals (trays, baffles, demisters), heat-exchanger tubesheets and floating-head closure parts, plus furnace fixtures and radiant-section hangers. Stock is drawn from in-house B564 forgings or solid B408 round bar with the chemistry, solution-anneal cycle (2050 deg F + accelerated cool) and grain-size verification (ASTM E112 grain size 5 or coarser) carried forward into the finished part. Every component ships with an EN 10204 type 3.1 certificate as default linking heat number, parent stock specification, machining record, dimensional inspection per the project drawing and the NDT report; type 3.2 third-party witness is supplied on call-out.
Machined-Component Dimensional Envelope
The dimensional envelope at the TorqBolt Rajkot plant is set by the CNC machining capacity. Typical part envelopes are summarised below.
| Part class | OD / size envelope | Length / height | Mass | Tolerance class |
|---|---|---|---|---|
| Subsea connector body | up to 800 mm OD | 1500 mm | up to 1200 kg | ISO 2768-m / per drawing |
| Valve spindle / stem | OD 30 to 200 mm | 2500 mm | up to 200 kg | per API 6A / API 600 |
| Pump shaft | OD 50 to 250 mm | 3000 mm | up to 400 kg | per OEM drawing |
| Furnace fixture / radiant-section hanger | per drawing | up to 2500 mm | up to 500 kg | per drawing |
| Heat-exchanger tubesheet | up to 1800 mm OD | per drawing (typ. 50 to 150 mm thick) | up to 2500 kg | per TEMA / drawing |
Machined-Component Manufacturing Route
- Stock selection: B564 forging blank (large or complex), B408 round bar (axisymmetric parts) or B409 plate (tubesheets, baffles) per drawing. Chemistry verified to B564 / B408 ranges, heat number recorded.
- Pre-machining solution anneal at 2050 deg F + accelerated cool on the parent stock (or carried over from the in-house forging traveller).
- Rough machine: 4-axis or 5-axis CNC mill, vertical lathe up to 1800 mm swing, horizontal boring mill for tubesheet drilling.
- Stress relief (on call-out for thin-wall fabrications): 870 to 900 deg C, 1 hour per 25 mm, slow furnace cool to avoid distortion. Stress relief is NOT a substitute for solution anneal.
- Finish machine: CNC finish-cut to drawing tolerance with carbide tooling at 60 to 120 m/min surface speed and 0.1 to 0.3 mm depth-of-cut.
- NDT: PT per ASTM E165 on full machined surface, UT per ASTM A388 on critical sections, hardness per ASTM E18.
- Dimensional inspection: CMM or articulated-arm probe against project drawing with first-article report.
- Marking + certification: Heat number, part number, drawing revision, serial number low-stress stamped or laser-engraved.
Stock and Lead Times
Machined components are made-to-order. Lead time depends on stock availability and machining complexity.
| Component class | Stock route | Lead time (after PO + approved drawing) |
|---|---|---|
| Simple axisymmetric (valve stem, shaft) | B408 bar held in stock | 4 to 6 weeks |
| Complex forged + machined (subsea connector) | B564 forging + machine | 10 to 14 weeks |
| Tubesheet (B409 plate, drilled) | B409 plate held to 100 mm thick | 6 to 10 weeks |
| Furnace internals / hangers | B564 + B408 mix | 6 to 10 weeks |
Component-Specific Inspection and Marking
- First-article inspection against the approved project drawing with CMM or articulated-arm probe.
- Liquid penetrant per ASTM E165 on full machined surface.
- Ultrasonic per ASTM A388 on critical sections (subsea connector pressure boundaries, valve spindle shoulders).
- Hardness per ASTM E18 - Rockwell B 70 to 90 in solution-annealed condition (carry-over from forging or bar).
- Surface roughness profilometer check on sealing surfaces (typically 32 AARH max on dynamic-seal surfaces, 63 AARH on static-seal surfaces).
- Helium-leak test on call-out for subsea connector pressure boundaries per ASTM E498.
- Marking: Heat number, part number, drawing revision, serial number low-stress stamped or laser-engraved per MSS SP-25 or per project standard.
Typical Component Service Conditions
| End-use component | Service environment | Companion application |
|---|---|---|
| Subsea production connector | Seawater + sour gas + 175 deg C wellhead | ASME VIII vessels |
| Hydrogen-service valve stem | up to 540 deg C in H2-rich service | Reformer service |
| Reformer pigtail finish-machined assembly | 815 to 900 deg C | Reformer pigtails |
| Fired-heater radiant-section hanger | 650 to 815 deg C | Radiant tubes |
| Heat-exchanger tubesheet | up to 540 deg C steam / process side | Heat exchanger tubes |
Companion Forms
Machined components are normally specified alongside companion B564 forgings (when machined from forged blank), B408 round bar stock (axisymmetric parts), B409 plate (tubesheets, baffles) and matching 800H fasteners for assembly. For weld-overlay or post-weld build-up procedures, see weldability procedures; for design-stress curves to 1500 deg F see the ASME design stress tables.
Machined-Components FAQ
Q. What machining parameters work best on Incoloy 800H?
Solid carbide or coated-carbide tooling at 60 to 120 m/min surface speed with 0.1 to 0.3 mm depth-of-cut and 0.05 to 0.15 mm/rev feed. Flood coolant with high-pressure delivery (above 70 bar) prevents work hardening at the tool tip. Avoid dwell at the cut to prevent surface burnishing and strain hardening that complicates downstream operations.
Q. Do you machine components that need post-machining heat treatment?
Yes on call-out. Stress-relief at 870 to 900 deg C for 1 hour per 25 mm of section, slow furnace cool, is supplied on thin-wall fabrications or parts that have been machine-stressed. A full re-solution-anneal at 2050 deg F is supplied on parts that have been hot-worked or welded after solution anneal of the parent stock.
Q. What surface finish do you supply on dynamic-seal surfaces?
Dynamic-seal surfaces (valve stems, pump shafts under packing) are finish-ground to 0.4 micron Ra (16 AARH) or 0.8 micron Ra (32 AARH) depending on the seal type. Static-seal surfaces are turned to 1.6 micron Ra (63 AARH) standard. Mirror finish (below 0.2 micron Ra) is available on call-out for hard-coating prep.
Q. Can you machine an 800H part from supplied customer stock (free issue)?
Yes. Customer-supplied stock with valid EN 10204 type 3.1 or 3.2 certification can be machined under a free-issue arrangement. Our certificate then covers machining, NDT and dimensional inspection only; the parent material chemistry remains traceable to the customer-supplied mill cert.
Q. Do you supply machined components with PED 2014/68/EU certification?
Yes. Machined components that fall within the PED 2014/68/EU pressure-equipment scope (subsea connectors, valve bodies, vessel internals carrying pressure) are supplied with the Annex I conformity-assessment certificate from a Notified Body in addition to the EN 10204 type 3.1 or 3.2 material certificate.
Request a Quote on Custom-Machined Incoloy 800H Components
Send the project drawing, material specification (ASTM B564 / B408 / B409), surface-finish requirement, NDT class, hardness or grain-size requirement, certification class (EN 10204 3.1 or 3.2) and any project add-ons (PED, NACE MR0175, NORSOK M-650, helium leak) to our sales desk.
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