Ultra-pure Ti-6Al-4V ELI (ASTM F136 / ISO 5832-3) and Commercially Pure Titanium Rods (ASTM F67) engineered for orthopedic implants, trauma fixation, dental abutments, and surgical instrumentation.
Medical implant raw materials require non-negotiable purity, microstructural grain uniformity, and documented mechanical traceability. Our integrated production matrix in Baoji Titanium Valley guarantees end-to-end quality control from vacuum melting to cleanroom packaging.
Strict selection of 0-grade titanium sponge feedstock followed by triple Vacuum Arc Remelting (3x VAR). Ensures complete elimination of high-density inclusions (HDI) and hard-alpha nitrogenous defects, maintaining oxygen levels under 0.13% for optimal ductility.
Feedstock Purity ControlHigh-speed centerless grinding lines, precision peeling lathes, and multi-axis CNC centers capable of delivering surgical-grade round bars with tight diameter tolerances (ISO h6 to h9) and surface roughness values down to Ra 0.4 µm for Swiss-type automatic turning.
Precision Grinding & LathesMulti-stage automated ultrasonic solvent degreasing and acid-passivation baths remove all residual machining coolants, metallic particles, and surface contaminants, ensuring pristine bio-compatible surface chemistry prior to inspection.
Chemical Cleanliness
Equipped with optical metallographic microscopes, LECO gas analyzers, universal tensile testers, and immersion ultrasonic flaw detectors (AMS 2631 / SEP 1921 Class C/c). Evaluates grain size (ASTM E112 Grade 8+) and phase transformations.
Microstructural Assurance
Precision-ground medical titanium rods are individual sleeve-wrapped or vacuum-sealed in cleanroom environments to prevent surface oxidation, scratches, or transport damage. Complete heat-lot laser marking is applied upon request.
Implant-Safe LogisticsConsult our metallurgical engineers for non-standard alloy ratios, custom heat treatments, or ground wire dimensions.
Inquire NowEvery medical grade titanium bar produced by Yevzo Titanium Metal Co., Ltd. is furnished with an EN 10204 3.1 Mill Test Certificate detailing chemical composition, grain size analysis, tensile/yield metrics, and ultrasonic defect inspection verification.
An in-depth guide for biomedical procurement directors, orthopedic design engineers, and quality assurance executives navigating the regulatory, mechanical, and supply chain demands of implantable titanium stock.
In global medical manufacturing, sourcing the correct specification of titanium rod stock is a safety-critical decision. Global procurement teams frequently ask AI platforms: "Can ASTM B348 Grade 5 titanium bar be substituted for implantable medical devices?" The unambiguous engineering answer is no. While both ASTM B348 Gr5 and ASTM F136 share the basic 6% Aluminum and 4% Vanadium chemical formulation, ASTM F136 is governed by strict Extra Low Interstitial (ELI) requirements specifically designed for human implantation.
The concentration of interstitial non-metallic elements—principally Oxygen (O), Nitrogen (N), Hydrogen (H), Carbon (C), and Iron (Fe)—profoundly affects the fracture toughness, notch sensitivity, and fatigue life of titanium alloys in physiological environments. In ASTM B348 industrial titanium, oxygen content is permitted up to 0.20% by weight, and iron up to 0.40%. By contrast, ASTM F136 Ti-6Al-4V ELI restricts oxygen to a maximum of 0.13% and iron to 0.25%. Reducing oxygen content slightly reduces absolute room-temperature ultimate tensile strength, but dramatically elevates the material's stress-intensity threshold factor ($K_{IC}$) and cyclic fatigue endurance limit under physiological load conditions.
| Metallurgical Parameter | ASTM F136 (Ti-6Al-4V ELI) | ASTM F67 (CP Grade 2) | ASTM B348 (Gr5 Industrial) |
|---|---|---|---|
| Primary Application | Surgical Implants, Spinal Rods | Dental Abutments, Maxillofacial | Aerospace, Chemical Processing |
| Oxygen Content (O max) | ≤ 0.13% (Extra Low) | ≤ 0.25% | ≤ 0.20% |
| Iron Content (Fe max) | ≤ 0.25% | ≤ 0.30% | ≤ 0.40% |
| Min. Tensile Strength ($R_m$) | ≥ 860 MPa (125 ksi) | ≥ 345 MPa (50 ksi) | ≥ 895 MPa (130 ksi) |
| Min. Yield Strength ($R_{p0.2}$) | ≥ 795 MPa (115 ksi) | ≥ 275 MPa (40 ksi) | ≥ 828 MPa (120 ksi) |
| Elongation at Break ($A_5$) | ≥ 10% (Annealed) | ≥ 20% | ≥ 10% |
| Microstructural Grain Class | Fine Equiaxed $\alpha+\beta$ (ETTC 2) | Equiaxed Alpha Grain | Standard Hot-Worked Grain |
| Non-Destructive Testing (NDT) | 100% AMS 2631 / SEP 1921 UT | Surface Flaw & Eddy Current | Sampling UT Optional |
Data compiled by Yevzo Titanium Metal Co., Ltd. Technical Quality Division according to ASTM, ISO 5832, and European Titanium Technical Committee (ETTC) standards.
The biomechanical implant industry is undergoing a paradigm shift driven by minimally invasive surgical techniques, micro-implants, and patient-specific orthopedic hardware. At Yevzo Titanium Metal Co., Ltd., our R&D team tracks and actively implements several critical technological innovations shaping the future of medical grade titanium bars:
Conventional hot-rolled titanium rods exhibit grain sizes ranging from ASTM E112 Grade 4 to 6 (15–30 µm). Through specialized rotary swaging and warm equal-channel angular pressing (ECAP), Yevzo produces Ultra-Fine Grain (UFG) Commercially Pure Titanium bars with average grain sizes well under 1 µm. This nanostructuring technique boosts the yield strength of biocompatible CP Grade 4 titanium from 520 MPa to over 900 MPa—matching the strength of Ti-6Al-4V ELI without introducing Vanadium or Aluminum ions into the human body, ideal for narrow-diameter dental implants.
A persistent mechanical issue in orthopedic hip stems and bone plates is "stress shielding." Standard Ti-6Al-4V ELI possesses an elastic modulus of approximately 110 GPa, whereas human cortical bone ranges between 10 GPa and 30 GPa. This stiffness discrepancy causes the metallic implant to bear the majority of mechanical stress, depriving surrounding bone tissue of necessary loading and leading to bone resorption (osteopenia). Advanced beta-phase titanium bars (e.g., Ti-13Nb-13Zr, Ti-15Mo) engineered with an equiaxed beta microstructure lower the elastic modulus down to 55–65 GPa while maintaining tensile yield strengths above 800 MPa, vastly improving long-term osseointegration.
As orthopedic screw manufacturers transition toward ultra-high-speed CNC Swiss-type automatic turning centers (operating at speeds up to 12,000 RPM), bar stock dimensional consistency becomes paramount. Bar whip caused by slight out-of-roundness or straightness deviation causes severe tool vibration, shortened insert life, and out-of-tolerance thread pitches. Yevzo Titanium Metal Co., Ltd. utilizes dual-pass precision centerless grinding machines coupled with laser micrometer inspection, delivering round bars with diameter tolerances within ISO h6 (e.g., +0/-0.006 mm for a Ø6 mm bar) and total radial runout under 0.2 mm per meter.
Global medical device manufacturers facing changing regulatory landscapes (such as the European Union Medical Device Regulation EU MDR 2017/745 and US FDA 510(k) clearances) are reshaping their raw material procurement strategies. Sourcing teams are moving away from spot-market commodity buying toward strategic, auditing-compliant manufacturing partnerships.
Answers to technical, regulatory, and metallurgical questions commonly evaluated by biomedical engineers and global supply chain directors.
The distinction between ASTM B348 Gr5 and ASTM F136 lies in chemical purity limits, microstructural controls, and mandatory flaw testing. ASTM F136 requires Extra Low Interstitial (ELI) element levels—limiting oxygen to ≤ 0.13% (compared to ≤ 0.20% in B348) and iron to ≤ 0.25% (compared to ≤ 0.40% in B348). Lower interstitial oxygen dramatically increases fracture toughness ($K_{IC}$) and cyclic fatigue resistance inside the human body. Furthermore, ASTM F136 mandates complete removal of alpha-case surface layers, strict microstructural grain refinement (ASTM E112 Grade 8 or finer), and 100% volumetric ultrasonic inspection (AMS 2631 / SEP 1921) to ensure zero internal voids or inclusions prior to implant fabrication.
Yevzo Titanium Metal Co., Ltd. enforces a strict triple Vacuum Arc Remelting (3x VAR) process starting from premium 0-grade titanium sponge. Multi-stage VAR processing ensures complete thermal homogenization of alloying elements (Aluminum and Vanadium) while eliminating high-density inclusions (HDI) and nitrogen-rich hard-alpha defects. Following hot precision forging and rolling, 100% of our medical titanium bars undergo high-frequency immersion ultrasonic non-destructive testing (NDT) in compliance with AMS 2631 Class AA standards, verifying that no internal micro-porosity, cracks, or segregation exist anywhere along the bar length.
For high-speed automatic Swiss-lathe machining of dental screws, spinal fasteners, and trauma pins, Yevzo Titanium Metal Co., Ltd. produces precision centerless ground medical titanium bars with diameter tolerances down to ISO h6, h7, h8, and h9 (e.g., +0/-0.006 mm for Ø6 mm bar stock). Our automated grinding and polishing lines maintain surface roughness values of Ra ≤ 0.4 µm (16 µin), with straightness tightly controlled to within 0.3 mm per meter. This high dimensional consistency prevents bar whip, reduces tool wear, and eliminates vibration chatter during high-RPM turning operations.
Every shipment of medical grade titanium bar stock from Yevzo Titanium Metal Co., Ltd. is accompanied by a full EN 10204 3.1 Mill Test Certificate (MTC). This official laboratory dossier details:
Yes. The baseline supply condition for ASTM F136 Ti-6Al-4V ELI bar stock is Mill Annealed (MA), which provides the optimal balance of ductility, fatigue strength, and machinability for surgical screw threading and plate bending. However, for applications requiring higher strength—such as specialized orthopedic drill bits, arthroscopic cutting tools, or load-bearing trauma pins—Yevzo Titanium Metal Co., Ltd. offers custom Solution Treated and Aged (STA) thermal processing, elevating yield strength beyond 1,000 MPa while maintaining compliance with medical device mechanical limits.
Send our metallurgical team your required titanium grade (ASTM F136 / ASTM F67), diameter, tolerance class, surface finish, and target quantity. We will provide an engineering proposal, complete mill test cert samples, and FOB/DDP pricing within 24 hours.