Unclassified 



DOCUMENT CONTROL DATA -R&D 



all report ix etas 



Naval Civil Engineering Laboratory- 

 Port Hueneme, California 93043 



Unclassifiea s 



CORROSION OF MATERIALS IN HYDROSPACE - PART VI - STAINLESS STEELS 



DESCRIPTIVE NOTES (Type of ttport and Indus I 



1962 - 1969 



uTuonisI (Flnlnmmm, rniddlt Initial, liiliimi; 



Fred M. Reinhart 



September 1 971 



3. OF PAGES 7b. NO. OF R 



105 15 



?T NUMBERtS) 



YF 38.535.005.01.004 



TN-1172 



96. OTHER REPORT NOISI (Any other numbers that may be maligned 



Approved for public release; distribution unlimited. 



Naval Facilities Engineering 

 Command 



A total of 1,750 specimens of 57 different stainless steels were 

 exposed in seawater at the surface and at depths of 2,500 and 6,000 

 feet in the Pacific Ocean for periods of time varying from 123 to 

 1,064 days in order to determine the effects of the seawater environ- 

 ments at different depths on their corrosion resistance. 



Corrosion rates, type of corrosion, pit depths and stress corro- 

 sion cracking resistance are presented. 



Cast stainless steel, Ni-Cr-Mo-Si, was uncorroded. 



AISI Types 317 and 329 stainless steels were attacked by incipient 

 (less than 1 mil deep) crevice corrosion. Stainless steel 20Cb-3 was 

 attacked by both incipient crevice corrosion and incipient pitting 

 corrosion. Most of the corrosion on AISI Type 325 stainless steel 

 was of the general surface type. 



All the other stainless steels, AISI Types 200, 300, 400 and 600 

 series and miscellaneous alloys, both cast and wrought, were attacked 

 by pitting, tunneling and crevice types of corrosion varying in inten- 

 sity from depths of 1 mil to complete perforation of the thickness of 

 the material and tunnels to 12 inches long. 



DD, F r\,1473 



S/N OtOI. 807. 6801 



Continued 



Unclassified 



Security Cla 



