I recently discovered a crack in my rudder shaft and will need to replace it. My boat is a 1984 Kirie-Elite 37 and the original shaft is (we think) 316 stainless x 32mm. My question is what type of stainless do modern boats use for rudder shafts. Is there a better material than 316 stainless for this shaft. The material will need to be welded to the paddles inside the rudder. It appears that the failure was the result of bending loads rather than torque loads.