Nano-precipitate reinforced ultra-high-strength steel and manufacturing method therefor

Abstract

A nano-precipitate reinforced ultra-high-strength steel and manufacturing method therefor, wherein the ultra-high-strength steel comprises the following components in percentage by weight: C: 0.15~0.21%, Si: ≤0.50%, Mn: 0.60~1.60%, Ti: 0.051~0.15%, V: 0.040~0.12%, Cr: 0.20~1.20%, B: 0.0005~0.0030%, Al: 0.02~0.06%, Ca: 0.0005~0.004%, N: ≤0.005%, P: ≤0.020%, S: ≤0.0050%, O: ≤0.0040%, Ti+V≥ 0.11%, the balance being Fe and inevitable impurities, and a nano-precipitate control index NPI is 5~26. The present invention also provides a manufacturing method for the above ultra-high-strength steel.

Dependencies are inferred from the claim text.