Q460C (GB/T 1591) is a low-alloy high-strength round steel designed for heavy structural applications, with a chemistry that delivers exceptional strength:
0.12–0.20% C: Provides a strong matrix without excessive brittleness.
1.00–1.70% Mn: Enhances solid-solution strengthening and hardenability.
0.50–1.00% Cr: Improves strength and corrosion resistance in harsh environments.
Microalloys: 0.02–0.20% Ti, 0.015–0.06% Nb, and 0.02–0.15% V refine grain structure (ASTM grain size 8–10) and precipitate strengthening phases.
P ≤0.035%, S ≤0.035%: Controlled to maintain toughness, critical for structural safety.
These elements combine to deliver 460 MPa minimum yield strength and 550–720 MPa tensile strength, making Q460C ideal for high-rise buildings, bridges, and offshore platforms. It is China's answer to ASTM A572 Grade 65 and EN 10025-2 S460, with Made-in-China listings highlighting it as "Q460C Ultra-High Strength Round Bar for Mega Projects."