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 Seamless Tube
Incoloy 800H seamless tube (UNS N08810, Werkstoff 1.4876) is supplied to ASTM B407 / ASME SB-407 in OD 6 mm to 150 mm with wall thickness from 1 mm to 12 mm, produced by the hot-pierce and cold-draw mill route at qualified Special Metals, VDM, Outokumpu and Sandvik mill sources. The tubular form differs from seamless pipe in dimensional convention (tube is specified by actual OD and wall, pipe by NPS and schedule) and is the canonical form for steam superheater coils, reformer pigtail tubing, fired-heater radiant-section coils, shell-and-tube heat exchanger bundles, instrument lead-lines and ASME Section I boiler service. Solution annealed at 2050 deg F (1121 deg C) bright in hydrogen or dissociated ammonia atmosphere, the as-supplied tube carries ASTM grain size 5 or coarser to qualify for design temperatures up to 815 deg C (1500 deg F). Each length ships with an EN 10204 type 3.1 mill certificate covering heat-number chemistry per B407 ranges, solution-anneal cycle, room-temperature mechanical results, hydrostatic test, eddy-current and dimensional check; type 3.2 with third-party witness from Lloyds Register, DNV, BV, SGS or TUV is supplied on call-out.
Tube Dimensions per ASTM B407
| Property | Range |
|---|---|
| OD range | 6 mm to 150 mm |
| Wall thickness range | 1 mm to 12 mm |
| OD tolerance | +/- 0.10 mm (small bore) to +/- 0.75 mm (large bore) per B407 |
| Wall tolerance | +/- 10 percent (cold-drawn) or +/- 12.5 percent (hot-finished) |
| Length | 3 m to 18 m (cold-drawn limited to ~ 18 m mill length) |
| End preparation | Plain end (default); square cut + deburr |
| Bend radii | Standard 3D bend; tighter 1.5D bend on call-out |
Tube Manufacturing Route
- Mill source verification: Special Metals, VDM, Outokumpu or Sandvik. Verify mill 3.1 cert + chemistry + traceability.
- Hot pierce: Solid billet pierced at 1180 to 1200 deg C on a Mannesmann mill.
- Cold draw or pilger: Multiple cold-draw passes with intermediate process-anneal to reach final OD and wall.
- Final solution anneal: 2050 deg F bright-anneal in hydrogen or dissociated ammonia, quench cool. Grain-size 5 or coarser locked in.
- Straighten: Multi-roll straightening to ASTM B407 paragraph 16 straightness requirement.
- Pickle + passivate: Bright-annealed tubes typically skip pickle; otherwise nitric-HF pickle + nitric passivation.
- Hydro test: per ASTM B407 paragraph 14.
- Eddy-current: per ASTM E309 full-length on small-diameter heat-exchanger tube; ultrasonic per ASTM E213 on call-out.
- Cut + deburr: Saw-cut to length, deburred both ends.
- Marking + protection: Heat number, B407, grade N08810, OD x wall, hydro stamp, mill mark.
Sizes Stocked and Lead Times
| Tube class | OD x wall | Stock status | Lead time |
|---|---|---|---|
| Heat exchanger tube | OD 19 x 2.1 mm (3/4 inch BWG 14) | Held in stock | 2 to 3 weeks |
| Heat exchanger tube | OD 25.4 x 2.77 mm (1 inch BWG 12) | Held in stock | 2 to 3 weeks |
| Superheater coil | OD 38 to 76 mm, wall 3 to 6 mm | Indent | 12 to 14 weeks |
| Reformer pigtail | OD 25 to 65 mm, wall 4 to 8 mm | Indent | 14 to 16 weeks |
| Instrument lead-line | OD 6 to 12.7 mm | Held in stock | 2 to 3 weeks |
Tube-Specific Inspection and Marking
- Eddy-current per ASTM E309 - full-length, default for heat-exchanger and boiler tube.
- Ultrasonic per ASTM E213 on call-out for refinery / nuclear-grade service.
- Hydrostatic per ASTM B407 paragraph 14, recorded per length.
- Flattening + flaring + reverse flattening per ASTM B407 paragraphs 13 + 15 on coupons per heat / lot.
- Grain size per ASTM E112 on coupon per heat. Acceptance: grain size 5 or coarser.
- Surface roughness: bright-annealed Ra typically 0.8 micron; finish-ground OD on call-out.
- Marking: per ASTM B407 paragraph 18 - grade, OD x wall, heat number, hydro stamp, mill mark, paint colour band per PFI ES-22.
Typical Tube Service Conditions
| End-use tube | Service temperature | Companion application |
|---|---|---|
| Steam superheater coil | 540 to 650 deg C (steam side) | Steam superheaters |
| Reformer pigtail tubing | 815 to 900 deg C | Reformer pigtails |
| Fired-heater radiant coil | 650 to 815 deg C | Radiant tubes |
| Shell-and-tube heat exchanger | up to 540 deg C | Heat exchanger tubes |
| ASME Section I boiler tube | up to 540 deg C | ASME boiler service |
Companion Forms
800H seamless tube assembles into bundles with 800H tubesheets drilled from B409 plate, joined by qualified tube-to-tubesheet welds (see weldability procedures) or by mechanical expansion. For larger-OD pipe (NPS 1/2 inch and above) see seamless pipe; for centrifugally cast tube (typical ethylene cracker form) see centrifugally cast tubes.
Engineering Guidance for Tube Specification
When selecting between SB-407 seamless tube and centrifugally cast tube per ASTM A608 for high-temperature service, the design tube-skin temperature is the dominant decision factor. Up to approximately 815 deg C tube-skin, wrought seamless tube delivers acceptable creep performance with the equiaxed solution-annealed grain structure. Above 900 deg C, the directional columnar-grain structure of a centrifugally cast tube delivers substantially longer creep-rupture life and is the standard choice for ethylene cracker radiant tubes and ammonia / methanol reformer outlet manifolds. The seamless cold-drawn route also produces tighter dimensional tolerance and a smoother bore finish than the cast route, which matters for heat-exchanger and instrument-tubing applications where pressure drop and surface cleanliness drive the design. For tubes that need post-mill cold bending into U-shape (TEMA heat-exchanger bundles), seamless is the only practical choice because the cast tube directional-grain structure does not survive cold bending. For tube-to-tubesheet welding by GTAW with autogenous root pass, seamless tube is preferred because the consistent wall thickness simplifies the weld procedure qualification under ASME Section IX. The TorqBolt sales desk can route a tube-specification query through the QA-QC team for a project-specific recommendation.
Seamless Tube FAQ
Q. What is the smallest OD available in 800H seamless tube?
The practical small-OD limit is 6 mm OD with 1 mm wall (instrument lead-line tube). Below 6 mm OD, the cold-draw mill route becomes uneconomic and capillary tube fabrication is normally outside the B407 product envelope.
Q. Do you supply 800H tube in U-bent form for heat-exchanger bundles?
Yes. U-bent tubes are supplied per TEMA RCB-2.31 with the cold-bent U-tube re-solution-annealed at 2050 deg F to relieve cold-work stresses and re-establish grain size in the bend. Bend-radius limit is 1.5D on call-out; standard is 3D bend.
Q. What is the difference between B407 tube and B163 tube?
ASTM B163 covers nickel-base seamless tube for general condenser and heat-exchanger service across a range of nickel alloys (Monel, Inconel, Incoloy) at lower design temperatures. ASTM B407 is specific to Ni-Fe-Cr alloys 800, 800H, 800HT and includes the controlled-carbon and grain-size requirements that qualify 800H for high-temperature creep service to 815 deg C. For high-temperature service the B407 spec is the correct choice.
Q. Can you supply 800H tube with polished OD for instrumentation use?
Yes. Finish-ground or polished OD to 0.4 micron Ra (16 AARH) or 0.8 micron Ra (32 AARH) is supplied on call-out for instrument lead-line, flow-meter and pressure-transmitter applications.
Q. Do you supply 800H tube to ASME Section I boiler code?
Yes. ASME SB-407 (the boiler-code adoption of ASTM B407) is the qualifying specification for 800H boiler tube under ASME Section I. Default certification is EN 10204 type 3.1; ASME Section I service typically calls out type 3.2 with third-party witness.
Request a Quote on Incoloy 800H Seamless Tube
Send the project line-list, OD x wall, length, U-bend or straight, surface finish, ASTM B407 grade, certification class (3.1 or 3.2) and any helium-leak / polished-OD / U-bend add-ons to our sales desk.
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