BS EN ISO 5832-2-2018 pdf download.Implants for surgery – Metallic materials Part 2: Unalloyed titanium.
5 Microstructure
The microscopic structure of the titanium in the annealed condition shall be uniform. The grain size, determined as specified in Clause 7. shall be no coarser than grain size No. 5.
At a magnification of x 100, no inclusions or foreign phases shall be visible. Iron is a beta phase stabilizer and the allowable iron limits might be sufficient to retain beta phase which is not considered a foreign phase in the microstructure.
6 Mechanical properties
61 Tensile properties
The tensile properties of the titanium, determined as specified in Clause 7. shall be in accordance with the requirements of Table 2.
If any of the test pieces fail within the gauge limits and do not meet specified requirements, two retest pieces shall be tested in the same manner, for each failed test piece. The alloy shall be deemed to comply only if both additional test pieces meet the specified requirements.
If a test piece fails outside the gauge limits, the test is acceptable if the percentage elongation after fracture meets the requirements. If the percentage elongation after fracture does not meet requirements the test shall be discarded and a retest shall be performed.
If any of the retests fails to meet the appropriate requirements, the product represented shall be deemed not to comply with this document. However, the manufacturer may, if desired, subject the material to heat treatment again and resubmit it for testing in accordance with this document.
62 Bending properties
Titanium sheet and strip, when tested as specified in Clause 7. shall not show any cracking on the outside surface of the test piece.BS EN ISO 5832-2 pdf downlaod.