Table 1.

Mechanical properties, in vitro degradation rate and average grain size of different iron-based materials investigated for biodegradable stents.

Material	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	In vitro Degradation Rate (mm y−1) *	Average Grain Size (μm)
316L SS: annealed (ASTM F138) [17]	190	490	40	-	12–30
Armco® Fe: annealed [13,18]	150	200	40	0.19	40
Fe-35Mn alloy: annealed [19–21]	230	430	30	0.44	<100
Fe-10Mn-1Pd alloy: heat treated [22]	850–950	1450–1550	2–8	-	-
Electroformed Fe: annealed at 550 °C [23,24]	270	290	18	0.46–1.22	2–8
Fe alloyed by different elements (Mn, Co, Al, W, Sn, B, C and S): as cast [25]	100–220	190–360	12–23	0.10–0.17	100–400
Fe-30Mn-6Si alloy: solution treated [26]	180	450	16	0.30	<100
Nanocrystalline Fe: ECAP, 8 passes [27]	-	250–450	-	0.09–0.2	0.08–0.20

^*The degradation rate is calculated from potentiodynamic polarization test.