| 摘要 |
<p>PURPOSE: A ship-building steel with excellent corrosion resistance against sea water is provided to increase the stability and service life of a ship and to alleviate coating maintenance and repair operation. CONSTITUTION: A ship-building steel with excellent corrosion resistance against sea water comprises carbon(C) 0.02~0.25%, silicon(Si) 0.05~1.0%, manganese(Mn) 0.2~2.0%, aluminum(Al) 0.1~2.0%, chrome(Cr) 0.1~3.0%, nitrogen(N) 0.001~0.01%, phosphorus(P) less than 0.03%, sulfur(S) less than 0.03%, the remainder iron(Fe) and inevitable impurity. An oxidized layer is formed on the surface of a steel material. The sum total content of chrome(Cr) and aluminum(Al) of the oxidized layer is higher 10 weight%. The steel material additionally contains one of copper(Cu) 0.05~0.5% and nickel(Ni) 0.05~1.0%. The steel material additionally contains one of molybdenum(Mo) 0.02~0.5%, tungsten(W) 0.02~0.5%, and cobalt(Co) 0.02~0.5%.</p> |
