Tungsten Carbide Tungsten Cemented Carbide . Tungsten carbide is extremely hard ranking 9 on Mohs scale and with a Vickers number of 1700–2400 It has a Young s modulus of approximately 550 GPa a bulk modulus of 439 GPa and a shear modulus of 270 GPa It has a very high yield stress at 6800 MPa but a comparatively low ultimate tensile strength of just 35 …