Table 4.

Mechanical properties of miniature tube materials [24].

Mechanical Properties	Miniature Tube A *	Miniature Tube B **
Metallography
Grain size	7	7–8
Hardness, HDN (HV0.3)	190.0	345.0
Yield strength 0.2%, ${\sigma }_{\mathrm{Y}}$ (MPa)	315.9	753.5
Ultimate tensile strength, ${\sigma }_{\mathrm{UTS}}$ (MPa)	600.2	943.7
Young’s modulus, E (GPa)	200.0	240.0

* Miniature Tube A: Annealed 1.8 mm OD and 110 µm wall thickness; ** Miniature Tube B: Hard Drawn 1.8 mm OD and 160 µm wall thickness.