The
mooring chain steel comprises the following components in percentage by
mass: 0.18 to 0.32 percent of C, 1.95 to 2.60 percent of Mn, 0.15 to 0.50 percent of Si, 0.45 to 1.20 percent of Cr, 0.008 to 0.250 percent of Mo, 0.02 to 1.20 percent of Ni, less than or equal to 0.40 percent of Cu, less than or equal to 0.005 percent of S, 0.005 to 0.250 percent of Al, less than or equal to 0.35 percent of (V + Ti + Nb), less than or equal to 0.06 percent of (Sn + As + Sb), 0.0005 to 0.0040 percent of Ca, 0.010 to 0.025 percent of REM, 0.004 to 0.024 percent of N, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H and the balance of Fe and inevitable impurities. On the basis of improving the
cost performance of R3, R4 and R4S grade
mooring steel, by utilizing the river-bay effect of Mn influencing a continuous
cooling curve of structural steel, namely similar to the influence rule of Mo, as the content of
alloy Mn is increased to a certain amount, the continuous
cooling curve of the steel begins to be bent, a component
system for increasing cheap elements Mn and Al and reducing precious elements Mo and Ni is designed, and through trial production of the steel and a chain, the
cost performance of the steel is improved. The effects of reducing the cost of the chain product and improving the obdurability of the chain product are achieved. The invention further relates to a
mooring chain and a production process thereof.