NOTE: Mariner steel composition contains higher percentages 

 of copper , nickel, silica, phosphorus than A-328. 



5 10 15 20 



5 Years Exposure 



5 10 15 20 



9 Yeors Exposure 



Corrosion Rate (mils/yr. 



Figure 9. Seawater corrosion comparison for A-328 steel and mariner steel. 



(After U. S. Steel Corp., I96U) 



19 



