Chemical composition is mass%, C: 0.15 to 0.45%, Si: 0.6% or less, Mn: 1.00 to 2.50%, P: 0.1% or less, S: 0.05% or less, Al: 0.1% or less, N: 0.01% Below, Sn: 0.01 to 0.5%, Cr: 0.1% or less, Cu: 0.1% or less, Ni: 0 to 5.0%, Sb: 0 to 0.5%, Mo: 0 to 1.0%, W: 0 to 1.0%, V : 0 to 1.0%, Ca: 0 to 0.01%, Mg: 0 to 0.01%, REM: 0 to 0.01%, Nb: 0 to 0.1%, Ti: 0 to 0.1%, B: 0 to 0.01%, balance: A mooring chain steel and a mooring chain using the mooring chain steel, which are Fe and impurities and satisfy [1-3.26Sn + 0.25Cr ≦ 0.80] and [Sn / Cu ≧ 1.0].
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