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 Welded Pipe
Incoloy 800H welded pipe (UNS N08810, Werkstoff 1.4876) is supplied to ASTM B514 / ASME SB-514 in NPS 1/2 inch through 24 inch, produced by rolling B409 plate or B409 sheet into a tube shape and joining the longitudinal seam by GTAW (gas tungsten arc welding) or SAW (submerged arc welding). The seam is 100 percent radiographed per ASTM E94 / ASME Section V Article 2 and the full pipe length is solution-annealed at 2050 deg F (1121 deg C) post-weld to dissolve any sensitisation and lock in ASTM grain size 5 or coarser for sustained service to 815 deg C (1500 deg F). Welded pipe is the canonical form for NPS 14 inch and larger lines on ethylene cracker outlet manifolds, fired-heater inlet/outlet headers, primary reformer outlet piping, ASME Section VIII pressure-vessel piping and large-bore heat-exchanger shell-side piping. Each length ships with an EN 10204 type 3.1 mill certificate covering heat-number chemistry per B514 ranges, weld-procedure qualification under ASME Section IX, radiographic record, solution-anneal cycle, hydro test and dimensional check; type 3.2 third-party witness is supplied on call-out.
Welded Pipe Dimensions per ASTM B514
| Property | Range |
|---|---|
| Pipe size (NPS) | 1/2 inch to 24 inch (DN 15 to DN 600) |
| OD | 21.3 mm to 609.6 mm (per ASME B36.19M) |
| Wall thickness schedules | Sch 10S, 40S, 80S, 160 |
| Weld process | GTAW (autogenous or with ERNiCrFe-2 filler) or SAW (with ERNiCrFe-2) |
| Seam radiography | 100 percent per ASTM E94 / ASME Section V Article 2 |
| Length | Single random (4 to 7 m), double random (7 to 12 m), cut-to-length per PO |
| End preparation | Plain end (PE), bevel end (BE per ASME B16.25) |
| OD / wall tolerance | per ASTM B514 paragraph 11 |
Welded Pipe Manufacturing Route
- Plate / sheet receipt: 800H B409 plate for wall thickness 4.75 mm and above, or B409 sheet for thinner walls. Verify mill 3.1 cert + chemistry.
- Plate shearing + edge prep: Plate sheared to width = pi x ID + weld allowance; edges machined to ASME B16.25 V-bevel for GTAW or SAW seam.
- Rolling: Three-roll or four-roll plate-bending mill rolls plate into open-seam tube.
- Tack weld + full-penetration seam weld: GTAW (root) + SAW or GTAW (fill + cap) per ASME Section IX qualified procedure with ERNiCrFe-2 filler.
- Radiography: 100 percent of weld seam per ASTM E94 / ASME Section V Article 2. Acceptance per ASME Section VIII Division 1 paragraph UW-51.
- Sizing + straightening: Sizing mill brings OD and roundness within ASTM B514 tolerance; straightening rolls remove residual curvature.
- Solution anneal: 2050 deg F (1121 deg C) full-length furnace anneal, accelerated air cool. This step is mandatory under B514 to dissolve sensitisation in the heat-affected zone of the seam weld.
- Pickle + passivate: Nitric-hydrofluoric pickle removes scale; passivation in dilute nitric acid restores the chromium-rich passive film.
- Hydro test: per ASTM B514 paragraph 13.
- Marking + protection: ASTM B514, grade N08810, heat number, size, schedule, weld-procedure number, radiograph stamp, manufacturer mark.
Sizes Stocked and Lead Times
| Pipe size | Schedule | Stock status | Lead time |
|---|---|---|---|
| NPS 8 to 14 inch | Sch 10S / 40S | B409 plate held | 6 to 8 weeks |
| NPS 16 to 20 inch | Sch 10S / 40S / 80S | B409 plate indent | 10 to 14 weeks |
| NPS 22 to 24 inch | Sch 10S / 40S / 80S | B409 plate indent | 12 to 16 weeks |
Welded-Pipe Inspection and Marking
- Radiography of seam: 100 percent per ASTM E94 / ASME Section V Article 2.
- Dimensional: OD, wall, length, ovality per ASTM B514 paragraph 11.
- Hydro test: per ASTM B514 paragraph 13.
- NDT: PT per ASTM E165 on bevel ends.
- Tensile + grain size: per ASTM A370 + ASTM E112 on coupons per heat / lot, including weld-metal tensile.
- Marking: per ASTM B514 paragraph 17 - grade, size, schedule, heat number, weld-procedure number, radiograph stamp.
Typical Welded-Pipe Service Conditions
| End-use | Service temperature | Companion application |
|---|---|---|
| Ethylene cracker outlet manifold (large bore) | up to 1050 deg C tube-skin | Ethylene cracker tubes |
| Primary reformer outlet header | 815 to 900 deg C | Reformer pigtails |
| Fired-heater inlet/outlet header | 650 to 815 deg C | Radiant tubes |
| ASME Section VIII vessel piping | up to 815 deg C | ASME VIII vessels |
| Large-bore heat exchanger shell piping | up to 540 deg C | Heat exchanger tubes |
Companion Forms
800H welded pipe spools with matching B16.5 flanges, B16.9 buttweld fittings, and joins per qualified welding procedures. For NPS 12 inch and below, the seamless pipe route is preferred. For mill source plate, see 800H plate.
Engineering Guidance for Welded Pipe Specification
When deciding between SB-407 seamless and SB-514 welded pipe for a given line, the typical engineering decision factors are pipe size, joint efficiency, lead time, and inspectability. Below NPS 14 inch, seamless pipe is preferred for simplicity and the absence of a longitudinal seam that requires periodic radiographic re-examination. From NPS 14 inch upward, welded pipe is the only practical choice because the seamless mill route does not extend above NPS 12 inch. The ASME Section VIII joint-efficiency factor E = 1.0 applies when the seam is 100 percent radiographed (the TorqBolt default for SB-514 production); this means there is no design-stress penalty for choosing welded over seamless. Inspectability favours seamless on the long-term in-service side because there is no seam to inspect; welded pipe requires periodic radiographic re-examination of the longitudinal seam at the inspection interval set by the asset-integrity programme. For high-purity service such as catalyst-bed reactors and ultra-pure-gas headers, seamless is preferred because the seam is a potential particulate-shed source. For shell-side service on heat exchangers above NPS 14 inch, welded pipe is the standard. The TorqBolt sales desk can supply a welded-versus-seamless comparison for any given size on request.
Welded Pipe FAQ
Q. Is welded pipe acceptable for high-temperature creep service?
Yes. ASME Section VIII Division 1 and ASME B31.3 both accept ASTM B514 / ASME SB-514 welded pipe at the same design allowable stress as the seamless equivalent SB-407, provided the longitudinal seam is 100 percent radiographed and the joint efficiency factor E = 1.0 is applied.
Q. What filler metal is used on the longitudinal seam?
ERNiCrFe-2 (AWS A5.14) is the standard filler for GTAW and SAW seam welding of 800H plate per ASTM B514. ERNiCrFe-7 (also known as AWS A5.14 filler for Alloy 690) is used on call-out for service in strongly reducing environments where weld-metal Nb stabilisation is preferred over Ti.
Q. Do you supply welded pipe with helium leak test on the seam?
Yes on call-out. Helium leak test per ASTM E498 on the longitudinal seam at a sensitivity of 1 x 10E-9 Pa.m3/s is supplied on call-out for vacuum-service and hyper-pure-gas applications.
Q. Is the seam weld solution-annealed after welding?
Yes. ASTM B514 requires that the full pipe length be solution-annealed at 2050 deg F minimum after seam welding, followed by accelerated cool. The post-weld solution-anneal dissolves any sensitisation that may have formed in the HAZ during welding and re-establishes the grain size needed for creep performance.
Q. Can you supply welded pipe pre-bevelled to ASME B16.25?
Yes. Standard practice is plain-end ship and field-bevel; on call-out we ship pre-bevelled to B16.25 figure 2 (30 deg V with 1.6 mm root face) with the bevel inspection record annexed to the EN 10204 certificate.
Request a Quote on Incoloy 800H Welded Pipe
Send the project line-list, NPS, schedule, length, end-prep, ASTM B514 grade, certification class (3.1 or 3.2) and any PMI / helium-leak / radiograph-storage add-ons to our sales desk.
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