Coal ship and coal / ore dual purpose ship corrosion resistant steel for inner bottom plate

摘要

PROBLEM TO BE SOLVED: To provide a corrosion resistant steel for bottom plate in holding a coal ship and a coal and ore ship exhibiting excellent corrosion resistance and having reduced deformation by contact and impact of loads under dry and wet repeating and low pH environment which is a corrosion environment by holding the coal ship and the coal and ore ship.SOLUTION: A corrosion resistant steel for bottom plate in holding a coal ship and a coal and ore ship has a composition containing, by mass%, C:0.01 to 0.25%, Si:0.01 to 0.50%, Mn:0.1 to 2.0%, P:0.035% or less, S:0.035% or less, Al:0.003 to 0.10%, Cu:0.05 to 0.35%, Ni:0.02 to 0.40%, Sb:0.01 to 0.2%, W:0.005 to 0.5%, Nb:0.003 to 0.025% and Cr:0.1% or less and the balance Fe with inevitable impurities and has yield strength of 390 MPa or more.