1.4307 (X2CrNi18-9) vs 1.4404 (X2CrNiMo17-12-2)

1.4404 (X2CrNiMo17-12-2) and 1.4307 (X2CrNi18-9) are about equally stiff. Their densities are about the same. Per unit mass they are about equally stiff (25.32 and 25 MJ/kg). Strength: f_y = 220 MPa for 1.4307 (X2CrNi18-9), f_y = 240 MPa for 1.4404 (X2CrNiMo17-12-2).

1.4307 (X2CrNi18-9) EN 1993-1-4 · EN 10088 · t ≤ 8 mm · C 1.4404 (X2CrNiMo17-12-2) EN 1993-1-4 · EN 10088 · t ≤ 8 mm · C

Side by side

ratio = 1.4404 (X2CrNiMo17-12-2) / 1.4307 (X2CrNi18-9) · log scale

Property	1.4307 (X2CrNi18-9)	1.4404 (X2CrNiMo17-12-2)	Unit	Ratio
E Young's modulus	200	200	GPa	1×
G Shear modulus	76.92	76.92	GPa	1×
ν Poisson's ratio	0.3	0.3	–	1×
ρ Density	7900	8000	kg/m³	1.01×
α Coefficient of thermal expansion	16	16	10⁻⁶/K	1×
λ Thermal conductivity	15	15	W/(m·K)	1×
c_p Specific heat capacity	500	500	J/(kg·K)	1×
ρ_e Electrical resistivity	0.73	0.75	µΩ·m	1.03×
f_y Yield strength (R_eH / R_p0.2)	220	240	MPa	1.09×
f_u Tensile strength (R_m)	520	530	MPa	1.02×
E/ρ Specific stiffness E/ρ · derived	25.32	25	MJ/kg	0.988×
c₀ Bar wave speed √(E/ρ) · derived	5032	5000	m/s	0.994×
f/ρ Specific strength f/ρ · derived	27.85	30	kJ/kg	1.08×

Values at the first thickness band or product form of each material (EN 1993-1-4 · EN 10088 · t ≤ 8 mm · C; EN 1993-1-4 · EN 10088 · t ≤ 8 mm · C). A minimum and a characteristic value are not the same kind of number — read the ratio as a guide. Each material's page lists every band and every source.