No primary melting
Ingot / VAR / EBM melting is not in our vertically integrated scope. We source bar and rod from upstream mills that hold the metallurgical chain-of-custody; our scope is sourcing, processing, and quality verification.
Boze Titanium Manufacturing Center | Mill Products / Bar & Rod | AS9100D
Titanium Bar & Rod — Industrial Mill Stock
Round, square and hexagonal titanium bar and rod stock in CP Gr1/2, aerospace Gr5 (Ti-6Al-4V), medical Gr23 (Ti-6Al-4V ELI) and corrosion-resistant Gr7 / Gr9 / Gr12. Diameter range Ø3.0–300 mm, centerless-ground and cold-drawn h7–h9 tolerance where specified. EN 10204 3.1 mill certification; standard stock ships in 3–5 days with non-standard alloys and custom heat-treat in 4–6 weeks.
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Ø3.0–300 mm Diameter range
h7–h9 Tolerance grade
9+ grades Stock range
3–5 days Standard lead time
ASTM B348 AMS 4928 ASTM F136 ISO 5832-3 EN 10204 3.1 AS9100D
Honest Positioning
Where We Don't Compete
BOZE Metal is a sourcing and processing partner for titanium mill products, not a primary melter. The following scope clarifications are necessary for accurate technical and commercial alignment.
No blanket "aerospace-grade"
Material specifications are applied "where applicable" per order. AS9100D governs our QMS, not every shipment's classification. Confirm criticality class, specification (AMS 4928, ASTM B348, ASTM F136), and required documentation per RFQ.
No "certified implant" blanket claim
We supply bar and rod to medical material specifications (ASTM F136 / ISO 5832-3) where applicable. We are a material supplier and processor, not a finished medical device manufacturer; downstream device-level certification remains the device maker's responsibility.
No 24-hour quote promise
Engineering review and quotation timelines are confirmed at the RFQ stage based on the order complexity, alloy, and downstream processing required. Standard stock items typically receive a same-week response.
UT inspection is order-specified
Ultrasonic examination per ASTM E213 / AMS-STD-2154 is available and applied where the order specification requires it. UT class (A1 / A2 / A3) and acceptance criteria are stated at the RFQ — not assumed by default on every shipment.
EN 10204 3.1 vs 3.2
Default mill certification is EN 10204 3.1 (manufacturer-issued, mill-quality-department inspection). EN 10204 3.2 (independent third-party witnessing) is available on request for pressure-vessel, nuclear, and critical-service applications.
Grade Library
Titanium Grade × Bar / Rod Form Matrix
Bar and rod form availability per titanium family, with UNS designation, nominal composition, and typical use. Refer to ASTM B348 for dimensional envelopes, and ASTM F136 / ISO 5832-3 for medical-grade specifications.
| Family | Grade / UNS | Nominal Composition | Bar / Rod Form | Typical Use |
|---|---|---|---|---|
| CP Titanium | Grade 1 UNS R50250 | Unalloyed Ti, lowest interstitial | Round, Square, Hex | Chemical processing, formable hardware |
| CP Titanium | Grade 2 UNS R50400 | Unalloyed Ti, balanced strength | Round, Square, Hex, Billet | Most widely specified CP — fasteners, valve trim, marine |
| CP Titanium | Grade 3 UNS R50550 | Unalloyed Ti, higher strength | Round, Billet | Higher-stress chemical service |
| CP Titanium | Grade 4 UNS R50700 | Unalloyed Ti, highest CP strength | Round, Hex, Billet | Aerospace fasteners, surgical hardware |
| Aerospace α-β | Grade 5 (Ti-6Al-4V) UNS R56400 | 6% Al, 4% V — α-β alloy | Round, Square, Hex, Billet | Aerospace workhorse — fasteners, pins, shafts, fittings |
| Aerospace α-β ELI | Grade 23 (Ti-6Al-4V ELI) UNS R56401 | 6% Al, 4% V, low interstitials | Round, Hex, Billet | Fracture-critical, medical device (where applicable) |
| Near-α | Grade 9 (Ti-3Al-2.5V) UNS R56320 | 3% Al, 2.5% V | Round, Tube, Bar | High-pressure hydraulic tubing, moderate strength |
| Corrosion-resistant | Grade 7 (Ti-Pd) UNS R52400 | CP + 0.12–0.25% Pd | Round, Hex, Billet | Reducing acids, HCl service, chemical industry |
| Corrosion-resistant | Grade 12 (Ti-0.3Mo-0.8Ni) UNS R53400 | CP + 0.3% Mo, 0.8% Ni | Round, Hex, Bar | High-temperature salt water, hot brine |
| High-strength | Ti-6Al-2Sn-4Zr-2Mo (Ti-6-2-4-2) UNS R54620 | 6Al-2Sn-4Zr-2Mo | Round, Billet, Forging | Aero engine components, high-temp sections |
Composition and form matrix indicative. Specific dimensions, tolerances, and heat-treat state are confirmed per order.
Specification Reference
Bar & Rod Specification EAV Reference
Ten procurement-critical attribute / value / standard references for titanium bar and rod stock. Use this as a cross-check table when drafting an RFQ; the applicable spec is selected per order.
| Attribute | Value / Range | Standard Alignment |
|---|---|---|
| Diameter range (round bar) | Ø3.0 mm → Ø300 mm | ASTM B348 §5 · AMS 4928 §3.3 |
| Square / hex bar | AF 6 mm → AF 100 mm | ASTM B348 §5 |
| Billet diameter | Ø200 mm → Ø600 mm (mill-sawn) | ASTM B348 §4 |
| Diameter tolerance (cold-drawn / ground) | h7, h8, h9 per ISO 286 | ISO 286-1 |
| Diameter tolerance (as-rolled / peeled) | Per ASTM B348 §8 table | ASTM B348 §8 |
| Straightness | ≤ 1.0 mm / m typical (≤ 0.5 mm / m on request) | ASTM B348 §9 |
| Surface finish | As-rolled, peeled, centerless ground, polished | ASTM B348 §10 |
| Surface roughness (ground) | Ra ≤ 0.8 μm typical | ISO 4287 |
| NDT (UT) | Class A1 / A2 / A3 per order — where specified | ASTM E213 · AMS-STD-2154 |
| Material certificate | EN 10204 3.1 (default) / 3.2 (on request) | EN 10204 §4 |
Medical · ASTM F136 / ISO 5832-3
Implant Blanks & Surgical Instrument Bar
Grade 23 (Ti-6Al-4V ELI) bar and Grade 4 (CP) round bar sourced to medical material specifications, for downstream machining into bone screws, spinal implant blanks, surgical instrument shafts, and dental implant components. -aligned material handling.
- Oxygen ≤ 0.13 wt% per ASTM F136 / ISO 5832-3 (ELI)
- Mill certificate per EN 10204 3.1; 3.2 witnessing on request
- Centerless-ground bar fed directly to Swiss CNC turning
Aerospace · AMS 4928 / AMS 4965
Aerospace Fasteners, Pins & Shafts
Grade 5 (Ti-6Al-4V) round, hex, and square bar in annealed (M) and cold-drawn (B+A) tempers for aerospace fastener, pin, and shaft machining. Vacuum-annealed for fatigue-critical sections, with EN 10204 3.1 chemistry and tensile traceability per heat-lot.
- AMS 4928 annealed / AMS 4965 solution-treated and aged
- Cold-drawn h7–h9 tolerance for direct CNC infeed (ISO 286-1)
- UT per ASTM E213 / AMS-STD-2154 where specified
Additional Applications
Where Bar and Rod Are Deployed
Additional industrial application areas for bar and rod stock — chemical processing pump and valve trim, marine and subsea hardware, semiconductor and general industrial machining.
Chemical Processing
Pump shafts, valve stems, thermowells, and agitator shafts in reducing-acid service. Grade 7 (Ti-Pd) and Grade 12 (Ti-0.3Mo-0.8Ni) for HCl, hot brine, and wet-chloride media.
Marine & Subsea
Submersible hull fittings, subsea manifold pins, and seawater pump shafts. Grade 2 / Grade 12 round bar to ASTM B348 for marine corrosion resistance with documented MTR.
Semiconductor
Vacuum-chamber hardware, gas-injection tubes, and showerhead fasteners. Grade 2 (CP) round bar for ultra-high-vacuum service where low outgassing and non-magnetic behavior are required.
General Industrial
Bar feedstock for downstream CNC turning, Swiss screw-machine, and high-precision shaft production. Standard stock supports both engineering prototypes and series production.
Production Workflow
Bar and Rod Production Workflow
From incoming VAR-refined ingot through forging, hot rolling, cold drawing / centerless grinding, annealing, NDT and MTR issuance — six controlled stages with documentation checkpoints at each handoff.
- 01
VAR Ingot Sourcing & Verification
VAR-refined titanium ingot sourced to ASTM B348 / AMS 4928 chemistry. Incoming spectrometer verification confirms alloy chemistry and interstitial control before stock release.
- 02
Hot Forging & Breakdown
Multi-direction forging on high-tonnage press breaks up cast dendritic structure, refines grain flow, and establishes mechanical-property baseline for downstream reduction.
- 03
Hot Rolling & Conditioning
Controlled heating window per grade; hot rolling reduction to intermediate bar diameter. Surface conditioning removes oxide scale and surface defects before further reduction.
- 04
Cold Drawing / Centerless Grinding
Cold-drawing dies and high-rigidity centerless grinders hold h7–h9 diameter tolerance per ISO 286-1. Surface finish and straightness verified against ASTM B348 §9 / §10.
- 05
Vacuum Annealing & Stress Relief
Stress relief or solution anneal per grade; vacuum or inert-atmosphere furnace prevents surface contamination and controls alpha-case formation.
- 06
UT, MTR & Lot Marking
UT per ASTM E213 / AMS-STD-2154 (where specified); EN 10204 3.1 MTR issued with chemistry, tensile, and impact data; laser-marked lot identity preserved to piece.
Operating Boundaries
Operating Boundaries & Failure Modes
Three service-environment boundaries that drive alloy selection and process planning. Confirm these constraints at the RFQ stage.
Creep Ceiling above 400 °C
CP titanium and common α-β alloys (Gr5, Gr23) are intended for service below ~315 °C for sustained loading; Ti-6Al-2Sn-4Zr-2Mo (Ti-6-2-4-2) extends this envelope to ~500 °C. Confirm elevated-temperature selection at RFQ for sustained operation above 400 °C.
Reducing-Acid & Fluoride Attack
Strong reducing inorganic acids (HCl, concentrated H₂SO₄) and anhydrous fluoride media attack unalloyed CP titanium. Specify Grade 7 (Ti-Pd) or Grade 12 (Ti-0.3Mo-0.8Ni) for these environments to suppress hydrogen uptake and embrittlement.
Deep-Hole Drilling & Work Hardening
Titanium work-hardens rapidly. Deep-hole drilling beyond L:D 10:1 without high-pressure internal coolant, peck cycles, and dedicated drill geometry risks flute packing, drill breakage, and excessive heat input to the workpiece.
AS9100D
Aerospace Quality Management System
ISO 9001:2015
Certified Quality Management System
Medical Device Quality Standard
MTR Traceability
Material Test Reports with Every Shipment
Quality
Uncompromising Quality Control
Every titanium part is verified, documented, and traceable before it leaves our Baoji facility — because in aerospace and medical manufacturing, documentation is just as critical as the cut itself.
CMM Inspection
Coordinate Measuring Machines verify every critical dimension against GD&T to ±0.005 mm before any part ships.
FAIR Reports
Project-specific First Article Inspection Reports delivered for every new part number — engineered for fast PPAP / FAIR approval.
Material Traceability
Material Test Reports (mill certificates) accompany every shipment for full source-to-component traceability.
Procurement & Lead Time
Supply Chain & Lead Time Windows
Stock availability, MOQ flexibility, and lead-time windows for titanium bar and rod. Final lead time is confirmed at the RFQ stage against current upstream mill schedule.
Mill Capacity & Sourcing
Baoji-sourced bar and rod rolled in commercial-scale lots; standard inventory supports both single-piece engineering prototypes and ton-scale industrial production. Final capacity is confirmed at RFQ stage against current upstream mill schedule.
MOQ Flexibility
Standard stock sizes carry no minimum order quantity for in-stock items. Non-standard alloy × dimension combinations are scheduled against minimum mill batch sizes per upstream supplier. Engineering sample pieces are available for grade-level evaluation on request.
Lead Time Windows
Standard stock sizes: 3–5 business days. Non-standard alloy × dimension combinations: 4–6 weeks. Custom heat treatment (solution-treat + age, special anneal cycles) or cold-draw to non-stock tolerance: 4–6 weeks.
Capability Comparison
BOZE Bar & Rod vs. Generic Mill Stock
Three procurement-critical capability differences between standard industrial mill stock and the BOZE bar and rod offering. Confirm which capability lines are required for your order.
| Dimension | Standard Mill Stock | BOZE Bar & Rod |
|---|---|---|
| Internal soundness & grain structure | Standard mill bar with potential center porosity and longitudinal segregation in heavy sections | Multi-direction forging + vacuum annealing refine grain to ASTM E112 ≥ 10; UT per ASTM E213 / AMS-STD-2154 |
| Dimensional tolerance & straightness | As-rolled tolerance only; subsequent rough turning required | Cold-drawn or centerless-ground to h7 / h8 / h9 (ISO 286-1); straightness ≤ 1.0 mm/m for direct CNC infeed |
| Heat-lot traceability & documentation | Mill test certificate with batch chemistry only | EN 10204 3.1 MTR with full chemistry, tensile, impact, and UT traceability; 3.2 independent witnessing on request |
Applications
Titanium Parts That Perform Where It Matters
From aircraft structures to surgical implants, precision titanium machining delivers the strength, bio-compatibility, and corrosion resistance that demanding industries rely on.
[Aerospace Structural Element] AERO
Aerospace Structural Elements
Brackets, fittings & frames machined from Grade 5 Ti-6Al-4V under AS9100D-controlled processes.
[Orthopedic Bone Screw] MED
Orthopedic Bone Screws
Implant-grade Grade 23 ELI (Ti-6Al-4V ELI) parts machined in cleanroom-controlled environments.
[Marine Valve Components] MAR
Marine Valve Components
Corrosion-resistant titanium valves, shafts & housings engineered for extreme offshore service.
[Motorsport Fasteners] MTR
Motorsport Fasteners
High-strength titanium bolts, studs & hardware for racing and high-performance vehicles.
Engineering & Procurement FAQ
Frequently Asked Questions
Six common buyer questions on interstitial control, heat-treat state, batch consistency, UT inspection level, ISO 286 tolerance, and EN 10204 3.1 vs 3.2 mill certification.
Q1 How is interstitial oxygen controlled in medical-grade (Grade 23 / Ti-6Al-4V ELI) titanium bar?
Medical-grade bar is sourced to ASTM F136 and ISO 5832-3, both of which cap oxygen at ≤ 0.13 wt% (vs ≤ 0.20 wt% for Grade 5 per ASTM B348). Lower interstitial content improves fracture toughness, ductility, and fatigue life in fracture-critical implant applications. MTR verification of O, N, H, and Fe content is provided on every heat-lot.
Q2 Should aerospace fastener stock be ordered in the annealed condition or in cold-drawn temper?
For cold-heading and thread-rolling of fasteners, specify annealed (M temper) bar with subsequent stress relief after forming. For as-machined aerospace pins, shafts, and fittings, cold-drawn bar (B+A condition) provides higher tensile/yield strength with controlled ductility. Both conditions are available; confirm forming sequence with the RFQ to align heat-treat state.
Q3 How is batch-to-batch mechanical-property consistency guaranteed for repeat orders?
Every bar is sourced from a single heat number (or controlled VAR lot) and issued with an EN 10204 3.1 MTR documenting the full chemistry, tensile, and reduction-of-area results. Repeat orders reference the original heat number where possible; when unavailable, the new heat-lot MTR is reviewed against the prior acceptance criteria before release.
Q4 What UT inspection level applies to aerospace bar stock?
Aerospace bar is typically inspected to AMS-STD-2154 Class A (longitudinal) or Class AA on request, with reference to ASTM E213 technique. Class selection depends on the part criticality: Class A1 for general structural, A2 / A3 for fracture-critical rotating or load-bearing hardware. UT acceptance criteria and recording level are specified per order; ultrasonic examination is available where specified.
Q5 What is the difference between h7, h8, and h9 tolerance and when is each specified for bar stock?
h7, h8, h9 are ISO 286-1 tolerance grades for shaft dimensions. h7 is the tightest (e.g. ±0.015 mm at Ø10 mm), h9 the loosest (e.g. ±0.036 mm at Ø10 mm). Specify h7 for high-precision Swiss turning, bearing seats, and medical implants; h8 for general CNC turning and fastener blank feed; h9 for as-rolled or peeled bar fed to secondary machining.
Q6 What is the difference between EN 10204 3.1 and 3.2 mill certification and when is 3.2 required?
EN 10204 3.1 is a mill test certificate issued by the manufacturer with independent inspection by the mill's quality department. EN 10204 3.2 adds independent witnessing by a third-party inspector (e.g. Lloyd's, TÜV, or customer-appointed agent) and is typically required for pressure-vessel, nuclear, and critical-service applications. Specify 3.2 at the RFQ stage when witnessed testing is required.
About Boze Titanium Manufacturing Center
One Metal. One Focus. Infinite Precision.
Founded in 2011 in Baoji's Titanium Valley, BOZE Metal is dedicated exclusively to titanium — from raw material to precision engineering. AS9100D, & ISO 9001 certified with 500+ clients across Aerospace, Medical & Motorsport industries, we deliver end-to-end precision titanium CNC machining with full material traceability from source to component.
Boze Titanium Manufacturing Center is operated by Baoji Boze Metal Products Co., Ltd.
Certifications verified by ASTM International titanium material specifications (B265, B348, B381, F136, F2924) with full EN 10204 3.1 mill test certification. Our quality system is operated under AS9100D by Baoji Boze Metal Products Co., Ltd.
AS9100D ISO 9001 500+ Clients 15+ Years OEM/ODM