We machine UNS N10675 and B-2/B-3 grade parts for hydrochloric acid service, acetic acid reactors, and reducing-environment piping. 127 CNC machines in Dongguan, 5-axis to Ø400 mm rotary work, held to ±0.005 mm.
This alloy is soft, gummy, and work-hardens fast. Most problems come from treating it like 316 stainless.
N10675 work-hardens the moment the edge rubs instead of cuts. A dull insert raises cutting force, chips the nose, and you lose the setup. We program constant feed per tooth, keep radial engagement controlled, and change edges on a counted schedule, not on sound.
Residual stress in rolled bar moves the part once you remove 60% of the section. A bore that gauges true on the bench can close up overnight. Rough, stress-relieve, then finish. We leave stock for the second op and hold the critical diameter after the part has settled.
Too much speed and the material smears, leaving built-up edge and a torn finish. Too little and the tool rubs. We run coated carbide at moderate surface speed, flood coolant, and sharp positive geometry. Where the drawing calls for a seal face, we aim for Ra 0.8–1.6 μm.
Cycle time on this alloy runs two to three times a 316 part of the same shape. A quote built on stainless numbers comes back late or gets quietly re-priced. We quote the alloy, the stock form, and the inspection the drawing actually asks for.
Two things decide the outcome: how the tool enters the cut, and how you handle stress between operations.
This alloy sits at the soft end of the nickel family. It does not harden from heat, it hardens from deformation. Every pass that rubs instead of shearing leaves a harder skin for the next pass to deal with.
We keep the cutter engaged, run constant chip load, and avoid dwell. Roughing removes the bulk with high-feed paths, then a semi-finish pass clears the work-hardened layer before the finish pass touches the tolerance band.
Thin-wall valve bodies, reactor internals, and pipe spools move when you take a heavy section down to a thin one. If you chase the dimension in one setup, the part relaxes after it leaves the machine and the measurement is worthless.
We plan the sequence around that. Rough, relieve, semi-finish, then finish the mating features last. Critical diameters and seal faces get checked on the machine and again at final inspection. Reports come with the shipment on request.
Pick the grade by what the media does to the metal, not by the price list.
| Grade | Best for | Avoid when |
|---|---|---|
| N10675 (Hastelloy B family) | Hydrochloric acid, sulfuric acid, acetic acid, reducing environments | Oxidizing media, ferric or cupric salts, aeration |
| C-276 | Mixed acid, chlorine, wet chlorine gas, oxidizing plus reducing | Cost is the only driver |
| 316L stainless | Mild chemical service, general process water | Chloride pitting above 60 °C, strong HCl |
| Inconel 625 | High temperature plus corrosion, seawater | Strong reducing acid without oxidizers |
One shop for the full part, from bar to finished surface.
16 simultaneous 5-axis centers handle valve bodies, impellers, and manifolds with compound angles in fewer setups. Less refixturing means less chance of a scrapped face.
16 mill-turn centers cut shafts, flanges, and nozzles complete in one cycle. Turning and milling in the same setup keeps concentricity where the drawing needs it.
27 three-axis and 12 four-axis machines for plates, housings, and brackets. Good fit for moderate complexity at a lower hourly rate than 5-axis.
No minimum order quantity. One part or 10,000. First articles let you pressure-test the design before you commit to a run.
Bead blasting, tumbling, brushing, polishing, and laser marking. Seal faces and gasket grooves get the finish the drawing specifies.
CMM and hand gauges, in-process checks, and dimensional reports on request. ISO 9001:2015 and ISO 13485:2016 systems behind the paperwork.
Numbers you can plan a project around.
| Item | Capability |
|---|---|
| Maximum part size | 4,000 mm |
| Large travel | 4,000 × 400 × 150 mm |
| Medium travel | 750 × 1,150 × 550 mm and 600 × 600 × 600 mm |
| Compact travel | 500 × 500 × 450 mm and 500 × 310 × 200 mm |
| Rotary table | Ø400 mm |
| Tolerance | ±0.005 mm (±0.0002 in) |
| Surface finish | Ra 0.2–0.8 μm fine, Ra 0.8–1.6 μm high, Ra 1.6–3.2 μm as machined |
| Stock forms | Bar, plate, forging, tube |
| Order size | One prototype to 10,000+ parts |
| Lead time | Quote and DFM in 12 hours; production starts in 24 hours; parts ship in 3–5 days |
15 years in Dongguan, three wholly-owned plants, 7,600 m² of floor space, and 150 technicians on the payroll. No brokered work passed to a third party.
16 simultaneous 5-axis centers, 12 four-axis mills, 27 three-axis machines, and 16 mill-turn centers. Work is scheduled across them, not queued behind one.
That is ±0.0002 in. Achievable on N10675 when the process is planned around stress and the tooling is sharp, not when it is chased after the fact.
Measured across production. Raw material check, in-process monitoring, and final inspection all feed into it.
Send a drawing and get a quotation plus a free DFM analysis within 12 hours. We flag thin walls, deep bores, and features that will move before you cut metal.
Late-delivery probability across past orders sits below 2%. We quote honest cycle times for nickel alloys instead of optimistic stainless numbers.
Nozzles, dip tubes, and internals for acetic and hydrochloric acid service. Wall thickness held so the pressure rating survives the weld.
Bodies, bonnets, and impellers with bores that stay round after the heavy section comes off. Machined complete in mill-turn where geometry allows.
Flanges, spools, and transition pieces for reducing-acid lines. Face flatness and bolt-hole position checked against the mating flange.
Tube sheets and baffles drilled and profiled without smearing the hole walls. Hole position and diameter verified before the tubes go in.
They are the same nickel-molybdenum family at different stages of the specification. B-2 lowered the iron and carbon limits to stop weld-zone corrosion. B-3 added tungsten and cut the iron and chromium further, which improved thermal stability and forming. N10675 is the current UNS designation covering the modern B-3 type chemistry.
For a new drawing, buy to N10675 or B-3. If the drawing still says B-2, the material is harder to source and the weldability is worse. Tell us which revision you are bound to and we will work to it.
Yes, with the right sequence. The tolerance itself is not the hard part. Holding it after the part relaxes is. We rough, stress-relieve, then finish, and the critical bore is cut near the end of the process.
Very deep bores in a gummy alloy are a different problem. Beyond roughly 4:1 depth to diameter, tool deflection and chip evacuation start to drive the result, and we will say so in the DFM review rather than promise a number we cannot check.
Anywhere the media is oxidizing. Ferric and cupric salts, dissolved oxygen, chlorine, and nitrate-bearing streams will attack this alloy quickly. It is also a poor choice for high-temperature service above roughly 600 °C, and it is not the answer for chloride stress-corrosion cracking in aerated seawater.
If the line sees both oxidizing and reducing conditions, C-276 is usually the safer pick even at higher material cost.
Cycle time runs two to three times a comparable 316 stainless part, and the bar stock costs several times more per kilogram. Tool wear is the other driver, because edges come out on a counted schedule rather than when they fail.
Send the drawing and we return a firm quotation with the DFM notes in 12 hours. You will see the operation breakdown, not a single blended number.
Either works. We can source N10675 bar, plate, forging, and tube with mill certificates, or machine customer-supplied stock. If you supply it, we will confirm the heat number and dimensions on receipt and flag any condition that will affect the cut.
For customer-supplied material we still apply the same in-process monitoring. The origin of the metal does not change how the tolerance is held.
Ra 0.8–1.6 μm is our standard high finish and covers most gasket and O-ring seats. Where the drawing asks for finer, we can reach Ra 0.2–0.8 μm on accessible faces with a dedicated finishing pass.
Blind grooves and deep bores limit what any tool can reach. We will tell you which features can hit the number and which need a different sealing method.
Uploads are secure and confidential. We sign an NDA on request before drawings are shared. Several of our customers work under standing agreements, and the parts are scheduled without the shop floor seeing the customer name.
Quotation and free DFM analysis come back within 12 hours. Production can start within 24 hours of a released order. Standard parts ship in 3–5 days.
Nickel alloy stock is not always on the shelf in every thickness. If the material has to be mill-ordered, that lead time sits in front of the machining time, and we will state it up front in the quote.
Upload your N10675 part files and we return a quotation with a free DFM analysis within 12 hours. One prototype or 10,000 parts, the same process controls apply.
12-hour quote100% inspectionNo minimum order quantityNDA on request
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Upload your 3D model or 2D drawing and get a quotation with a free DFM analysis. Maximum processing size 4,000 mm.
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