Grade 2 Titanium CNC Machining Services — CP-Ti (UNS R50400)

Engineering Challenge

Commercially pure titanium chips tend to be long, stringy, and "gummy" — they do not break cleanly. The behavior is driven by the alloy low thermal conductivity combined with the absence of hard second-phase particles. Long stringy chips can wrap the tool, scratch the workpiece, and clog flutes, especially in deep cavities, through-holes, and small-diameter features.

Our Machining Approach

We use sharp, positive-rake carbide tooling with chip-breaker geometry suited to CP-Ti, lower cutting speeds than for Ti-6Al-4V (often 30–50% lower), high-pressure coolant directed at the cutting edge, and rigid setup with adequate chip clearance. Toolpath strategies (trochoidal milling, climb cutting where compatible, controlled engagement) are used to reduce chip-pack risk. Tool condition is monitored to maintain edge sharpness.

Engineering Outcome

Predictable chip evacuation, reduced risk of re-cut and surface damage, and improved process repeatability. Final achievable tolerances depend on part geometry, setup rigidity, material condition, and inspection method; for validated geometries, the process can target linear dimensional tolerance up to ±0.025 mm — generally looser than alloyed grades, but with significantly less tool wear.

Engineering Challenge

Grade 2 corrosion resistance in chloride-bearing media (seawater, brines, bleach, nitric acid) depends on an intact, oxide-passive surface. Iron, carbon-steel, abrasive, or free-machining-steel embedment from prior work can seed pitting, galvanic cells, and crevice corrosion, even when bulk chemistry is correct. Cleaning, pickling, and passivation steps can repair the surface, but the safest approach is to prevent contamination in the first place.

Our Machining Approach

Where the order scope requires it, we segregate CP-Ti work from carbon-steel / 316L / aluminum work, use dedicated tooling, workholding, and consumables, and verify cleanliness at incoming and pre-finishing inspection. Surface preparation per ASTM B600 (alkaline cleaning + acid pickling) is scheduled per the agreed inspection plan. Passivation schedules are matched to the customer downstream service environment.

Engineering Outcome

Surface free of iron and abrasive embedment, with the passive oxide film intact at the point of shipment. Corrosion performance remains subject to the customer qualification of the finished component in its service environment; we do not perform in-house corrosion testing beyond the agreed surface-preparation acceptance criteria.

Engineering Challenge

Grade 2 is overwhelmingly used in welded assemblies — tanks, heat exchangers, piping, fluid handling. The machined features are typically weld preps (groove angles, root faces, backing-ring seats) plus flange faces, sealing surfaces, and ports. Thin-wall vessels, headers, and formed sheet present low rigidity and large springback under cutting force, especially when the parent material has been cold-worked. Thermal distortion from adjacent welding further tightens the post-machining tolerance window.

Our Machining Approach

We machine weld preps to the agreed geometry (typically per ASME IX / AWS D1.6 / ISO 9692 as applicable), with root-face flatness, groove angle tolerance, and surface-finish targets confirmed against the welding procedure specification. For thin-wall vessels and formed sheet, we use low-engagement roughing, balanced machining sequences, and dedicated workholding sized to the part envelope. Final machining is scheduled as late as practical in the assembly sequence to leave weld distortion allowance for the final cut.

Engineering Outcome

Weld prep geometry that meets the agreed WPS tolerance band, thin-wall features held within drawing limits after welding, and final machined reference surfaces available for fit-up. Tolerance and surface-finish commitments are confirmed after CAD, drawing, material condition, weld sequence, and inspection-method review.