What is the modulus of elasticity for SUS304 round bars?

SUS304 stainless steel round bars have a modulus of elasticity (E) of 193 GPa (193,000 MPa) at room temperature, slightly lower than carbon steel (200–210 GPa). The modulus of elasticity measures stiffness- the material's resistance to elastic deformation under stress. This value is critical for design, as it determines how much a round bar will deflect under load. For example, a 25 mm diameter SUS304 bar spanning 1 meter under a 100 kg load will deflect ~0.5 mm, calculated using the modulus of elasticity. Unlike yield strength, the modulus of elasticity is not affected by work hardening or heat treatment, remaining consistent across all SUS304 round bars. Engineers use this value in structural calculations (e.g., beam deflection, spring design) to ensure components perform as intended. JIS G4305:2015 does not mandate testing for modulus of elasticity, as it is a well-established material property for SUS304.