IS 1538 specifies hardened and tempered carbon steel wire used for manufacturing mechanical springs. Tensile strength varies by wire diameter (higher for thinner wires). Two grades: SW for general springs and SWP for precision/high-performance springs.
Specification for hardened and tempered carbon steel wire for mechanical springs, covering grades, dimensions, mechanical properties, and testing.
Key Values
Tensile strength (1mm dia)1620-1870 MPa
Tensile strength (5mm dia)1270-1470 MPa
Carbon content0.60-0.75%
Practical Notes
! Tensile strength increases as wire diameter decreases — this is normal for drawn wire products.
! Always specify the exact diameter required — tensile strength requirements change with each diameter band.
! For corrosion-resistant springs, consider IS 4454 (stainless steel spring wire) instead.