How does b407 incoloy 800 tube pricing compare to Inconel 600 tube?

Procurement teams that spec nickel alloy tubing often narrow the choice down to two workhorses: ASTM B407 Incoloy 800 (UNS N08800) for oxidizing, high-temperature service, and Inconel 600 (UNS N06600, supplied under ASTM B167) for caustic, chloride-containing, and reducing environments. Both alloys look similar on a quotation sheet, but the unit price rarely tells the full story. The gap between B407 Incoloy 800 tube pricing and Inconel 600 tube pricing is shaped by raw material cost, processing difficulty, certification, and the application risk each grade is asked to absorb. This guide breaks down those levers side by side so that engineering, purchasing, and quality can agree on the most cost-effective specification before the RFQ is sent.

Why the Two Grades Are Often Compared

Both Incoloy 800 and Inconel 600 are nickel-iron-chromium alloys used in heat exchangers, furnace components, ethylene pyrolysis, and chemical processing. They share a similar face-centered cubic microstructure, are austenitic and non-magnetic, and both weld easily with matching filler metals. The key reason they are quoted together is that they often compete for the same line on a piping isometric.

In practice, the decision comes down to environment. B407 Incoloy 800 tube is specified where the service is hot, oxidizing, and may involve carburization — think ethylene cracking coils, ammonia effluent coolers, or super-heater sections. Inconel 600 tube is specified where the service is hot but chemically aggressive, especially in caustic soda evaporators, sodium sulfide solutions, or chloride-bearing media where Alloy 800 is more vulnerable to stress corrosion cracking. Once the environment is fixed, the alloy is fixed, and only the price can be optimized.

Composition and Density: The Real Driver of Price

The single largest component of any nickel alloy tube price is the value of nickel, chromium, and iron in the melt. The two grades differ sharply:

Inconel 600 carries roughly twice as much nickel in the melt charge and is about 7% denser than Incoloy 800. Because the LME nickel price usually dominates the raw material cost, a higher nickel content translates almost directly into a higher per-kilogram cost. On top of that, every kilogram of Inconel 600 tube contains more metal mass than the same length of Incoloy 800, so a quotation given in USD per piece or USD per meter will also show a wider gap than a quotation given per kilogram.

Typical Market Price Range

Spot prices fluctuate with the London Metal Exchange nickel quotation, the order quantity, and the level of testing required. The ranges below are based on mill-level FOB indications for cold-drawn seamless tube in standard sizes (OD 6–114 mm, wall 1–6 mm), EN 10204 3.1 certification, and normal hydrostatic testing:

In other words, B407 Incoloy 800 tube pricing generally lands at roughly 35–50% of the Inconel 600 tube price for the same dimension and same delivery condition. The narrower end of the range applies to bulk tonnage with standard EN 10204 3.1 certification, while the upper end reflects small lots, tight tolerances, additional non-destructive testing, or third-party inspection.

It is also worth noting that both grades can move sharply in step with the LME nickel quotation. A 10% swing in nickel price typically shifts the two grades by similar percentages, but because Inconel 600 has more nickel in the matrix, its absolute price moves further in dollars per kilogram. Procurement teams that lock in alloy surcharge or use a fixed-price contract tend to be more comfortable specifying the higher-nickel grade.

Cost Drivers Beyond the Alloy Charge

Raw material is the headline number, but several secondary cost drivers frequently decide the final quotation:

1. Form and condition. Cold-drawn seamless tube is the most common supply form for both grades. Hot-finished tube, U-bent tube, and finned tube carry additional forming and heat-treatment steps. Incoloy 800 in the annealed condition typically uses solution annealing at 1100–1200°C with rapid cooling, which is similar to Inconel 600. The cost of the anneal is comparable, but Inconel 600 sometimes requires tighter temperature control to avoid grain coarsening, which can add a small premium.
2. Dimensional tolerance. Tighter OD and wall-thickness tolerances, especially for heat-exchanger tubes (typically ±5% wall, ±0.1 mm OD on small sizes), add drawing or pilgering passes. Both grades respond in a similar way, but Inconel 600 work-hardens slightly more, so the same tolerance may require an additional intermediate anneal.
3. Testing and certification. Standard hydrostatic or eddy-current testing is included in most mill prices. Additional requirements such as ASTM G28 intergranular corrosion tests, ultrasonic testing per ASTM E213, 100% PMI, or EN 10204 3.2 certification with a third-party inspector all add cost. These extras tend to fall in a similar dollar range per tube regardless of grade, but on a percentage basis they hit the cheaper Incoloy 800 quotation harder.
4. Minimum order quantity. Both grades have MOQs in the 200–1,000 kg range at most mills. Below the MOQ, mills often apply a small-lot surcharge or shift the order to a stockist, which can widen the price gap. Inconel 600 small lots are usually harder to source from stockists, so the small-quantity premium for Inconel 600 is typically larger than for Incoloy 800.
5. Lead time. Incoloy 800 is a more common inventory item at most Chinese, European, and Indian mills and is usually available in 4–6 weeks. Inconel 600 seamless tube often carries a longer mill lead time of 6–10 weeks for non-stock sizes. Expedited production can shorten the schedule, but it usually adds 10–20% to the quotation.

Application Fit: Picking the Right Grade Before Negotiating Price

The cheapest tube on paper is rarely the cheapest tube in service. The right way to compare B407 Incoloy 800 tube pricing with Inconel 600 tube pricing is to first confirm that the grade is fit for the actual service environment, then optimize the quotation for that fixed grade.

Where B407 Incoloy 800 Tube Is the Better Choice

• Ethylene and steam-methane reformer furnace tubing, where carburization resistance and long-term creep strength at 600–900°C are the priorities.
• Ammonia effluent coolers, hot CO/CO₂ streams, and ammonia reformer secondary reformer outlets, where the higher chromium and the Ti/Al stabilization of Incoloy 800 give a clear advantage over Inconel 600.
• Heat-treating fixtures, retorts, radiant tubes, and electric-range heating-element sheathing, all of which lean on oxidation resistance rather than nickel-content-driven corrosion resistance.
• Petrochemical pyrolysis tubing and process piping in refineries where sulfur-bearing atmospheres are present at high temperature.

Where B167 Inconel 600 Tube Justifies the Premium

• Caustic soda (NaOH) evaporators operating above 50% concentration, where Alloy 600 has decades of field-proven performance and Alloy 800 would risk caustic stress corrosion cracking.
• Nuclear and power plant service, where ASME Section III / RCC-M requirements favor the low-cobalt, high-nickel N06600 family, including for steam generator tubing support and primary loop components.
• Reducing environments and halogen-bearing media, where the higher nickel content of Inconel 600 prevents chloride-induced stress corrosion cracking and attack by acidic halide solutions.
• High-temperature aerospace exhaust manifolds and engine components, where the higher nickel content delivers the required strength-to-weight stability at peak temperatures.

If the service is oxidizing, sulfidizing, or carburizing, B407 Incoloy 800 tube is the technically and economically correct pick. If the service is caustic, halogenated, or strictly reducing, the higher price of Inconel 600 tube is essentially insurance against an in-service failure.

Standards and Specification Differences

The two grades are written into different ASTM standards, and the buying specification must reflect that. ASTM B407 covers nickel-iron-chromium alloy seamless pipe and tube, including the N08800, N08810 (Incoloy 800H), N08811 (Incoloy 800HT), N08120, N08890, and N08140 grades. ASTM B167/B167M covers nickel-chromium-iron alloys such as N06600, N06601, and N06690, with N06600 being the Inconel 600 grade most often compared to Incoloy 800. The mechanical-property envelopes are similar at room temperature (tensile ≥ 485 MPa and yield ≥ 170 MPa for annealed N08800, tensile ≥ 550 MPa and yield ≥ 240 MPa for annealed N06600), but the higher strength of Inconel 600 at temperature is the reason it is preferred in pressure-bearing, high-temperature duties.

For project specifications, the ordering checklist is also slightly different. B407 Incoloy 800 tube orders should specify the UNS grade (most commonly N08800, with N08810 or N08811 for creep-resistant variants), the condition (annealed, hot-finished, or cold-worked), the heat-treatment condition, and any required NDE. B167 Inconel 600 tube orders should specify N06600, the condition, the heat treatment, and any additional corrosion or PMI testing. Mixing the two standards on the same line item is a common RFQ error that leads to rejected bids.

Practical Tips to Optimize the Quotation

1. Lock the alloy first. Confirm whether the service is oxidizing or reducing before sending the RFQ. A spec change from Inconel 600 to Incoloy 800 can cut material cost roughly in half, but it must be backed by a corrosion review, not by procurement pressure.
2. Consolidate the order. Combining multiple line items into a single mill order pushes the quantity well above the MOQ and brings the unit price closer to the lower end of the band, especially for Inconel 600.
3. Use standard sizes where possible. Non-standard OD, wall, or length always carries a conversion premium. Standard heat-exchanger sizes in 19.05 mm, 25.4 mm, and 38.1 mm OD with 2 mm or 2.77 mm wall are almost always cheaper for both grades.
4. Right-size the testing. Specify 100% eddy-current or hydrostatic testing only where the design code requires it. Adding ultrasonic testing on top of the standard NDE can add 5–10% to the unit price without changing the qualification status of the tube.
5. Plan lead time. Order Inconel 600 tube 8–10 weeks ahead of installation. Rush orders almost always come back with a premium that wipes out any negotiation gains.

How EZ Steel Industrial Supports Both Specifications

EZ Steel Industrial manufactures and supplies both grades out of dedicated production bases. The ASTM B407 Incoloy 800 seamless tube line covers UNS N08800 as well as the creep-resistant 800H (N08810) and 800HT (N08811) variants, with full solution-annealing, hydrostatic, and non-destructive testing available in-house. The B167 nickel-chromium-iron alloy tube line covers UNS N06600, N06601, and N06690, produced to the same heat-treatment and inspection standards. For project buyers who need to balance cost and corrosion risk, ASTM B165 Monel 400 pipe is also available for reducing and seawater services, and the full copper and nickel alloy tube range can be quoted alongside Incoloy 800 to optimize material selection across an entire unit.

With EN 10204 3.1 mill test certificates, optional third-party inspection, and mill-direct pricing on standard and non-standard sizes, EZ Steel Industrial can usually quote both grades within the same week. Send the line-item list, the design code, and the operating temperature, and the engineering team will return a side-by-side quotation that reflects both the alloy surcharge and the in-house processing cost, so the purchasing decision is based on the full delivered cost rather than the spot price of nickel.