200 





Circular 



Weld 



Transverse Butt Weld 









P P 



P F 





P 





P 





P 





P 





p 





100 







# 





» 





• A 





• 





♦ A 





80 





| | A 



























60 

 40 



— 



1 — 

















— 









— 





— 



H H 





O MPY — 





'■■■■ !■ ■:'.'. 











— 











• Max. Pit Depth, Mils. 1 







j 





20 



' 



1 — i i — i 



1 — 1 





1 — 1 





— 



— 











A Crevice Corrosion, Depth, Mils. 















P Perforated j 









10 



— 



! [ 1 





||| j j j [ 











— 



1 1 ' 1 



j — j 



j — j j — j — | 







— 



X 8 

 § 6 



— 



1 [ { 









_ _ 



— 



j 



— p-M 











o 



4 











i 1 



2 



1 



.8 

 .6 



.4 



.2 

 .1 



— 



J I II 





Oil 11 11 



1 1 1 [ 



— 



1 







Days 



181 



197 



402 



403 



Depth, Ft. 



5 



2,500 



2,500 



6,000 



181 

 5 



197 

 2,500 



398 

 5 



402 403 

 2,500 6,000 



Figure 31. Corrosion rates, maximum pit depths and crevice corrosion of 

 welded AISI Type 632-RH1100 precipitation hardening stainless 

 steel in seawater at the surface and at depth. 



90 



