60Si2CrVA round steel (GB/T 1222) is a premium spring steel designed for high-speed railway springs, with exceptional properties:
Tensile strength: 1810–2060 MPa after quenching (860°C) and tempering (440°C), enabling it to withstand repeated high loads from train vibrations.
Yield strength: ≥1660 MPa, ensuring minimal permanent deformation even after millions of load cycles.
Fatigue limit: ≥750 MPa for 10⁷ cycles, critical for springs in high-speed trains (300+ km/h) with strict safety requirements.
Hardness: 44–50 HRC, balancing elasticity and wear resistance for long service life (≥1.2 million km).
Its chemistry (0.56–0.64% C, 1.60–2.00% Si, 0.40–0.70% Cr, 0.10–0.20% V) enhances fatigue resistance, making it the top choice for high-speed railway bogie springs.