Overview
EN ISO 5832-3:2021 - "Implants for surgery - Metallic materials - Part 3: Wrought titanium 6‑aluminium 4‑vanadium alloy (Ti‑6Al‑4V)" is the international/CEN standard that defines the required chemical, microstructural and mechanical characteristics and the corresponding test methods for wrought Ti‑6Al‑4V used in the manufacture of surgical implants. The standard covers raw implant material (not finished devices) and specifies how conformity is tested and reported. It is the 2021 revision adopted by CEN (supersedes the 2016 edition).
Key topics and requirements
- Chemical composition (representative heat analysis):
- Aluminium: 5.5–6.75%
- Vanadium: 3.5–4.5%
- Iron: ≤ 0.3%
- Oxygen: ≤ 0.2%
- Carbon: ≤ 0.08%
- Nitrogen: ≤ 0.05%
- Hydrogen: ≤ 0.015% (billets: ≤ 0.010%)
- Titanium: balance
- Microstructure: required to be equiaxed alpha or elongated primary alpha in a transformed beta matrix, with no continuous alpha network at prior beta grain boundaries. Round bar transverse microstructures are referenced to photomicrographs A1–A9 in ISO 20160.
- Mechanical properties (annealed condition):
- Tensile strength (Rm): ≥ 860 MPa
- Proof/yield strength (Rp0.2): ≥ 780 MPa
- Elongation after fracture: ≥ 8% for sheet/strip, ≥ 10% for bar
- Bend test: sheet/strip must show no cracking; mandrel diameter = 10 × thickness (t)
- Test methods and references: tensile testing per ISO 6892‑1, bend testing per ISO 7438, microstructure per ISO 20160, and other recognized analytical procedures for chemical analysis.
- Conformity rules: retest rules, specimen gauge length reporting, and the note that finished product properties may differ from raw material test results.
Applications and who uses it
- Material suppliers and mill producers specifying and certifying Ti‑6Al‑4V for implant-grade raw stock (bars, sheets, billets).
- Medical device manufacturers and implant designers using wrought titanium for orthopaedic, dental and other surgical implants.
- Testing and inspection laboratories performing chemical, microstructural and mechanical conformity tests.
- Regulatory and procurement teams verifying material compliance in device technical files.
- R&D and metallurgical engineers comparing ISO and ASTM harmonization (Annex B) when selecting grades or sourcing international material.
Related standards
- ISO 6892‑1 - Tensile testing of metallic materials (room temperature)
- ISO 7438 - Bend test for metallic materials
- ISO 20160 - Classification of alpha+beta titanium alloy microstructures
- ASTM specifications referenced for ELI-grade details (see Annex notes for harmonization)
EN ISO 5832‑3:2021 is essential when specifying implant-grade wrought Ti‑6Al‑4V to ensure consistent chemistry, microstructure and mechanical performance and to support traceable testing and regulatory compliance.
