Commercially Pure Titanium (Grade 1–4)

Grades 1–4 contain >99% Ti with oxygen as the primary interstitial. Grade 1 (120–170 HV) machines cleanly but lacks strength; Grade 4 (200–240 HV) doubles tensile strength yet gums cutters more readily.

Grades 2 and 3 balance formability and corrosion resistance for medical-device housings and chemical-process fittings. None suit high-load mold cores.

Alpha-Beta Alloys (Ti-6Al-4V)

Ti-6Al-4V accounts for ~50% of global titanium consumption. Hardness spans 310–360 HV; tensile strength reaches 900–1,100 MPa. Machinability index ~0.25 relative to free-cutting steel demands carbide tooling and flood coolant.

XUXIANG machines Ti-6Al-4V for ADAS sensor housings, micro-connector terminal inserts and high-cycle mold lifters where weight and corrosion resistance justify the 3–4× cycle-time penalty over tool steel.

Alpha Alloys

Alpha alloys (Ti-5Al-2.5Sn, Ti-3Al-2.5V) retain ductility to cryogenic temperatures and resist creep above 400°C. Hardness 280–320 HV; machinability slightly better than Ti-6Al-4V.

Applications include aerospace fasteners and heat-exchanger tubing. Rarely specified for precision mold components due to cost and limited availability in small bar stock.

Beta Alloys

Beta alloys (Ti-15V-3Cr-3Al-3Sn, Ti-10V-2Fe-3Al) offer the highest strength-to-weight ratios and deep hardenability but machine 20–30% slower than Ti-6Al-4V. Hardness after aging exceeds 380 HV.

Used in landing gear and high-performance springs. XUXIANG evaluates beta grades case-by-case for ultra-lightweight robotics end effectors when design justifies premium lead times.

Commercially Pure Titanium (CP Grades 1–4)

CP titanium offers excellent corrosion resistance and biocompatibility, making it the standard for medical-device housings, surgical instruments and dental implants. Grades 1 and 2 are most machinable, with tensile strengths from 240 to 550 MPa.

XUXIANG machines CP grades for sensor housings and connector shells where EMI shielding and tissue contact are critical. Lead times average 12–15 days for prototype runs, with +/-0.002 mm positional tolerances verified on ZEISS MICURA CMM.

Ti-6Al-4V (Grade 5) for High-Stress Applications

Ti-6Al-4V accounts for roughly 50% of global titanium consumption, delivering 900+ MPa tensile strength and stable performance to 400°C. It is the workhorse alloy for automotive ADAS brackets, NEV powertrain mounts and industrial robotics end effectors.

XUXIANG holds corner radii down to R 0.015 mm on slow-wire EDM and achieves Ra 0.1 µm mirror finishes on sinker EDM, critical for high-cycle fatigue parts in automation.

Beta Alloys for Complex Geometries

Beta titanium alloys (Ti-15V-3Cr-3Al-3Sn, Ti-10V-2Fe-3Al) offer enhanced cold formability and spring-back characteristics, suited to thin-wall connector pins and flexure hinges. Cost premiums run 20–40% above Ti-6Al-4V, and availability requires longer lead times.

XUXIANG sources beta alloys through certified suppliers with full material traceability and spectral-analysis reports, ensuring compliance for aerospace-tier and medical-grade projects.

Anodizing: Type II and Type III

Type II anodizing produces decorative color layers (5–25 µm) with minimal dimensional impact (+/-0.0127 mm per surface) and maintains Ra 0.4–0.8 µm; common in consumer electronics and medical ID marking. Type III (hard anodizing) builds 50–100 µm ceramic-oxide layers, increasing surface hardness to ~1,500 HV and corrosion resistance, but adds +/-0.05 mm per side — critical for aerospace fasteners and wear surfaces.

XUXIANG’s mirror-grade EDM base (Ra 0.1 µm) ensures uniform anodize adhesion and color consistency across multi-cavity tooling inserts.

Passivation and Electropolishing

Passivation (ASTM A967) removes free iron and forms a stable oxide layer without dimensional change, essential for medical implants and pharmaceutical tooling. Electropolishing removes 5–20 µm of material, reducing Ra to 0.05–0.2 µm and improving corrosion resistance by 40% — preferred for surgical instruments and cleanroom fixtures where particulate shedding is unacceptable.

Bead Blasting and PVD Coating

Bead blasting (glass or ceramic media) produces uniform matte finishes at Ra 1.6–3.2 µm, masking minor machining marks on non-critical surfaces like housings and brackets. PVD (TiN, TiAlN) deposits 2–5 µm hard coatings for wear resistance in high-cycle automation grippers and robotic end effectors, adding negligible dimensional shift (+/-0.005 mm) while extending service life 3–5×.

Dimensional Accuracy and CMM Verification

XUXIANG’s ZEISS MICURA CMM measures to 0.7 µm, validating +/-0.001 mm machining capability on titanium cores and inserts. Every critical dimension receives three-axis verification against CAD nominal; Nikon toolmaker’s microscopes (V-12B / MM-400 class) confirm edge radii down to R ≤ 0.015 mm.

CMM inspection is mandatory for aerospace-grade titanium parts where tolerance stack-up drives assembly success. Request full FAI reports with GD&T call-outs, not generic pass/fail stamps.

Surface Finish Consistency and Profilometry

Mirror-grade EDM finishes down to Ra 0.1 µm are achievable on titanium, but only with controlled electrode wear and dielectric chemistry. Optical profilometry maps peak-to-valley roughness across the entire surface, catching micro-pitting invisible to touch.

Inconsistent Ra values signal unstable tool paths or thermal drift. Demand surface-integrity checks at in-process milestones, not just final inspection.

Alpha-Case Detection and Removal

Alpha-case — an oxygen-enriched brittle layer — forms during thermal processing and compromises fatigue life. X-ray fluorescence (XRF) verifies oxygen concentration; metallographic cross-sections confirm removal depth.

XUXIANG’s five-step QC flow includes surface-integrity checks to detect alpha-case before shipment. Specify maximum allowable oxygen content and removal method (chemical milling or precision grinding) in your purchase order.

Work-Hardening Prevention Through Tool-Path Strategy

Titanium work-hardens rapidly under excessive feed or dull tools, creating subsurface stress that triggers premature failure. Proper CAM programming uses adaptive tool paths, constant chip load and climb milling to minimize plastic deformation.

Request process documentation showing spindle speed, feed rate and coolant strategy. Hardness testing (Rockwell or Vickers) at multiple depths confirms the absence of work-hardened zones.

Material Certification and Mill Test Reports

Every titanium billet must ship with a mill test report (MTR) documenting heat number, chemistry (ASTM E1479 spectral analysis) and mechanical properties. XUXIANG performs incoming spectral analysis to verify grade before machining.

Insist on full traceability: MTR, material certificate and heat-lot stamps on each part. This documentation is non-negotiable for medical-device and automotive supply chains governed by IATF 16949 or ISO 13485.

Equipment and Machining Capability

Confirm the supplier operates 5-axis CNC machines with high-rigidity frames for titanium’s low thermal conductivity and high cutting forces. Ask whether they use carbide or PCD tooling, coolant-through spindles and chip-evacuation systems. XUXIANG deploys Fanuc-class CNC and Sodick EDM to hold +/-0.002 mm on complex titanium geometries.

Industry Certifications and Traceability

Verify ISO 9001:2015 as baseline; aerospace buyers should require AS9100, medical-device OEMs ISO 13485. Request material certificates with heat-lot traceability and spectral-analysis reports. Red flag: any supplier unable to trace raw titanium back to mill certification.

Inspection Environment and Metrology

Demand climate-controlled inspection rooms (20°C ± 1°C) and CMM equipment rated to sub-micron resolution. XUXIANG’s ZEISS MICURA measures to 0.7 µm, ensuring titanium parts meet aerospace and medical tolerances without thermal expansion errors.

Prototype-to-Production Scaling and Lead Time

Ask for case studies in your industry and confirm capacity to scale from 10-piece prototypes to 1,000+ production runs. Evaluate lead-time flexibility: XUXIANG averages 30% faster delivery than industry norms through dual-factory coordination and in-house EDM.

Over-Specifying Tolerances

Calling out +/-0.002 mm across every feature when +/-0.01 mm suffices can double machining time and scrap rates. Titanium’s work-hardening and tool wear make ultra-tight tolerances expensive.

Apply precision only where function demands it — mating surfaces, bearing seats — and relax non-critical dimensions to +/-0.05 mm or wider.

Ignoring Thermal Expansion in Design

Titanium’s coefficient of thermal expansion (8.6 µm/m·°C for Grade 5) differs from aluminum and steel, yet many designs assume uniform behavior. High-temperature assemblies can bind or gap.

Request DFM review with thermal-cycle modeling; XUXIANG’s engineering team flags expansion mismatches before first cut.

Undefined Surface Finish Requirements

Omitting Ra targets or finish method invites rework. Titanium can be ground to Ra 0.2 µm or left at Ra 1.6 µm as-machined — cost and lead time vary 3×.

Specify Ra, lay direction and inspection method on every critical surface in your drawing.

Wrong Alloy for the Thermal Environment

Grade 2 loses strength above 300 °C; Grade 5 (Ti-6Al-4V) holds to 400 °C. Mismatches cause creep or embrittlement.

Match alloy to operating temperature and consult material datasheets during design freeze.

Underestimating Lead Times

Titanium machining runs 40–60 % slower than aluminum due to tool wear and chip control. Rush orders often fail.

Build 2–3 weeks extra into your project timeline and confirm capacity during RFQ.

Define Performance Requirements and Environment

Document operating temperature range, corrosive exposure, load cycles and biocompatibility needs. XUXIANG’s DFM team reviews environmental constraints against material limits — Grade 2 for ambient corrosion, Grade 5 for high-stress cycling, Grade 23 for medical implants. Clear requirements prevent costly grade changes mid-project.

Create Detailed 3D CAD with GD&T Callouts

Supply STEP or IGES files with geometric dimensioning and tolerancing annotations. XUXIANG’s CAM engineers use GD&T to program tool paths that hold +/-0.001 mm positioning. Missing callouts trigger clarification loops that add 3–5 days to lead time.

Request Quotes with Material Certifications

Ask for mill test reports (MTR) and spectral analysis certificates alongside pricing. XUXIANG includes material traceability in every RFQ response, confirming grade, heat lot and mechanical properties before production.

Order Prototype Run with Full Inspection Report

Request 3–5 first articles validated on ZEISS CMM with dimensional layout and surface-finish data. XUXIANG’s FAI package includes material cert, CMM report and photographic evidence, enabling design iteration before tooling lock.

Transition to Production with Locked-in Specifications

Freeze CAD revision, material grade and inspection plan in a formal engineering change order (ECO). XUXIANG archives baseline drawings and CMM programs to ensure every production lot matches validated prototype tolerances.