C70600 (Cu-Ni 90/10) Prices October 19, 2026: Melt Sideways As Nickel Eases

C70600 is doing the opposite of pure copper this week. While LME copper pushed through $14,500/tonne for the fourth week running, LME nickel eased further - front-month down to $17,440/tonne ($7.91/lb) from $17,560 the prior week. Net melt for C70600 is roughly +0.40% on the week, well below the +0.66% pure copper prints. The fabrication-premium story is the one that matters: seamless Cu-Ni 90/10 heat-exchanger tube lead times have extended to 8–12 weeks, up from 6–10 weeks at the start of Q4. Marine restock - desalination, shipbuilding and offshore platform maintenance - is the driver, and it is now setting the floor on the fabrication premium for everything else in the Cu-Ni line. If your Q4 BOM touches heat-exchanger tube, plate, or pipe in Cu-Ni 90/10, this is the week to lock the mill slot.

Sources: published LME 3-month closes, weekly melt reference prints, China-domestic mill-printed quotes for export channels (week ending Oct 16, 2026). Trading reference: October 19, 2026.

The problem is that C70600 has been trading on copper-and-nickel legs that are moving in opposite directions for the first time since late summer. LME 3-month copper is on a four-week run of +0.66% / +0.69% / +0.69% / +0.66% prints; LME 3-month nickel has been softening for two weeks - −0.41% the week of October 12 and −0.68% this week to $17,440/tonne. Nickel supply is not tight - Indonesian NPI production, the Chinese nickel-powder / battery chain normalisation, and stainless-steel restock cooling have all combined to keep pressure on the nickel line. For a C70600 BOM (Cu 88.6% minimum, Ni 9–11%), the weekly melt move is the weighted sum of those two opposing moves, and this week that sum came out to roughly +0.40% - half of what C11000 captured.

The cause of the fabrication premium reset is downstream restock in the marine and heat-exchanger chain. A Q4 contracting cycle for desalination projects and shipbuilding-fabrication lead-times has pulled Cu-Ni 90/10 seamless tube lead time to 8–12 weeks from 6–10 weeks at the end of September. Heat-exchanger tube (ASTM B395 / B543) is the tightest line - the published mill quote this week carried a +$0.18/lb fabrication premium on top of melt. That is the largest single-product move in the C70600 line for the week. Plate, sheet and pipe carried +$0.07–0.12/lb. The melt is sideways, but the fabrication premium is not.

What it means for your quote is unambiguous: the C70600 heat-exchanger tube price coming back this week is the floor for Q4 2026, not the ceiling. The cost consequence in dollar terms: a Q4 heat-exchanger-tube order worth $80,000 USD on the late-September baseline is now closer to $88,000 - that is +$8,000 on a single order, before any tolerance adjustment. Marine and shipbuilding fabricators are restocking now to avoid the next fabrication-premium round, expected to land in mid-November once the November contracting cycle closes. If your part uses C70600 tube, pipe or heat-exchanger tube, this is the week to lock the mill slot.

Three signals in the data are worth flagging before the November contracting cycle closes.

The LME copper and nickel legs are moving in opposite directions. For eight weeks prior, both legs firmed together. This is the second week where they are decoupling. For C70600 buyers, that decoupling is the cleanest pricing signal in the line right now. It says: the underlying metal is neutral; the cost moves you see on printed mill quotes are entirely downstream-mix driven. Track Q4 marine and shipbuilding demand to predict fabrication-premium direction - not LME copper.

Heat-exchanger tube lead time has extended to 8–12 weeks. The +3-week lead-time shift since September 28 is the strongest forward indicator of fabrication-premium widening in any Cu-Ni product form. If your part uses ASTM B395 or B543 tube, book the mill slot this week and ask for written delivery confirmation. Q4 contracting for marine / desalination projects closes mid-November; the post-November fabrication-premium round is +$0.10–0.20/lb on top of current.

C71500 (Cu-Ni 70/30) carries a structural premium of $1.50–2.50/lb on top of C70600. That spread has been stable for six weeks. If your part specification allows 90/10 instead of 70/30, this week's data says 90/10 is the cleaner source - and the C71500 supply is structurally tighter because the order book at major mills is weighted toward 70/30 for high-salinity desalination projects.

Cost lines as a copper-nickel mill or finishing-house actually bills them, expressed as USD per lb of finished C70600 product, with USD per kg in parentheses. Prices include the fabrication premium applicable to the week ending October 16, 2026. Marine / heat-exchanger line carries the highest fabrication premium (40–55% above melt); plate / sheet / bar at 30–40%.

USD/lb prices reflect October 16 spot assessments with prevailing LME Cu $6.61/lb and LME Ni $7.91/lb. Fabrication premium varies by form, temper and lead time; ranges shown are typical for the most-traded product / temper combinations.

C70600 (Cu-Ni 90/10) is the workhorse marine grade. Five nearby grades trade at premium or discount versus the baseline. Quick reference for buyers deciding whether to upgrade or substitute.

Premiums reflect October 16 spot assessments. C70600 baseline at $9.20–11.00/lb plate equivalent. Discounts and premiums vary by form and temper; ranges shown are typical for plate / tube equivalents.

C70600 is rated at 0.4× the free-machining copper scale - comparable to 304 stainless at low speeds. Three operational notes consistently trip first-time Cu-Ni buyers:

Use sharp carbide tooling with high rake. C70600 work-hardens very fast under the tool. A dull insert will glaze the surface within 30 seconds of cut time. Plan for tool change intervals measured in machined inches, not hours.

Reduce cutting speed and use positive chip geometry. Recommended surface cutting speed for C70600: 100–150 SFM (30–45 m/min), versus 200–300 SFM (60–90 m/min) for C11000. Feeds are deeper not faster; chip-breaker geometry on inserts is non-optional.

Coolant pressure matters for through-tool coolant. Cu-Ni gumminess under low coolant pressure leads to built-up edge. Through-tool coolant at ≥70 bar is standard on production runs of C70600 plate / tube / heat-exchanger parts.

Six product-line moves that the data is pointing to, in priority order.

C70600 heat-exchanger tube (ASTM B395 / B543). This is the tightest line - +$0.18/lb on the week, lead time 8–12 weeks. Lock the mill slot this week; the November contracting cycle closes in roughly four weeks. Q4 desalination / shipbuilding tenders are starting to bite, and the post-November fabrication-premium round is +$0.10–0.20/lb on top of current. Ask for written delivery confirmation and U-bend tolerance verification.

C70600 seamless tube (ASTM B466, 1/4″–2″ OD). Lead times extended +2 weeks. Book the mill slot this week, especially for condenser / hydraulic-tube applications where process-side certification matters. The fabrication premium is widening on this form too.

C70600 pipe, seamless ≥ 2″ (ASTM B466, sch 10S / 40S / 80S). Lead time +1 week since September 28. Lock Q4 pipe volume inside the next ten trading days. For seawater service, ask for cathodic-protection spec and welding-procedure verification per ASME Section IX.

C70600 plate (ASTM B171). Plate is the cleanest line in the snapshot - +$0.07/lb on the week, melt pass-through only. Re-quote C70600 plate this week; the printed quote still gives room for a nickel-reset clause. For Q1 2027 delivery, lock now and budget a 3–5% premium over current.

C70600 sheet (ASTM B171, 16–48 oz). Shipyard restock applied. Lock sheet stock for late-Q4 or early-Q1 2027; the fabrication premium widens as the November contracting cycle closes. If part spec allows, ask if C11000 sheet with surface coating can substitute for non-seawater applications to reduce cost.

C70600 bar / rod (ASTM B151). Slower demand line. This is the lowest-priority RFQ to act on this week; the printed quote carries +$0.08/lb but lead times are stable. Re-quote is optional; lock only if you have a Q1 2027 deadline.

Two signals to watch over the next two weeks.

If LME copper pushes above $15,000/tonne, the C70600 melt value moves above $6.75/lb and the fabrication-premium round that started this week widens further. The recommendation on heat-exchanger tube and pipe shifts from "lock this week" to "lock today"; budget 5–7% above current printed quotes for late-Q4 and early-Q1.

If LME nickel reverses and prints above $18,500/tonne, the nickel leg adds melt pressure of +$0.06–0.08/lb on top of the copper gain. For C71500 (Cu-Ni 70/30) the cumulative move is +$0.18–0.25/lb; for C70600 it is roughly +$0.06–0.10/lb. That signal flips the cross-alloy comparison - 90/10 stops being obviously cheaper than 70/30 if both legs of melt firm in unison.

Mill-direct product lines carried in our Q4 catalogue for Cu-Ni 90/10 (UNS C70600), with related grades C71500, C71640 and C72200 supplied against on request. Mill test certificates per EN 10204 3.1 are standard; full mechanical-property and corrosion-test reports on request. Marine / offshore documentation support (DNV, BV, LR, ABS) on request.

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