Chemical element composition of Chinese grade ultra-high strength marine steel plate FH960
FH960 Approaching Steel Plate Grade Lookup Table

FH960  Chemical composition

Grade Delivery status Chemical composition (mass fraction)/%
C Si Mn Pᵃ Sᵃ Cu Crᵇ Ni Nbᵇ Vᵇ Tiᵇ Moᵇ N Altᵈ 
FH960 QT ≤0.18 ≤0.80 ≤1.70 ≤0.020 ≤0.010 ≤0.50 ≤1.50 ≤2.00 ≤0.06 ≤0.12 ≤0.05 ≤0.70 ≤0.015 ≥0.018
ᵃ The P and S content of the structural steel is allowed to be 0.005% higher than the values ​​specified in the table.

ᵇ Except for quenched and tempered steel, Nb+V+Ti ≤ 0.26% and Mo+Cr ≤ 0.65%.

ᶜ With the consent of both the supplier and the buyer, the Ni content may be appropriately increased. 

ᵈ The minimum ratio of total aluminum to nitrogen should be 2:1. When other nitrogen-fixing elements are used, the minimum aluminum content and aluminum-nitrogen ratio are not required.

ᵉ Oxygen content [O] ≤50×10⁶.

ᶠ Oxygen content [O] ≤ 30 × 10⁶. 

ᵍ When boron is intentionally added to enhance the hardenability of steel, the boron content should not exceed 0.005%.