431 stainless round bar (ASTM A276; GB 14Cr17Ni2) is a martensitic stainless with properties balancing aesthetics and strength:
Tensile strength: 730–930 MPa, higher than 304's 515 MPa, making it suitable for structural trim that must support loads.
Hardness: 28–32 HRC after heat treatment, providing scratch resistance for visible automotive components.
Corrosion resistance: Superior to 410 (more Ni) but less than 304, sufficient for under-hood and exterior trim in moderate environments.
Polishability: Can be mirror-finished, combining visual appeal with functional strength-ideal for grille surrounds and door handles.
431 is used in luxury automotive trim and structural parts like seat belt retractors, offering a cost-effective alternative to 304 when higher strength is needed.
These entries further demonstrate the versatility of round steel across industries, with grades engineered to meet precise performance requirements from deep-drawn consumer goods to extreme-temperature industrial components.