The
dual layer design required two separate metal pours to cast the two layer
wall.
--
The outer wall (1" thick) was a 410 stainless steel alloy
and the inner wall (3/8" thick) was a 316 stainless steel
alloy. --
The 316 stainless provided the corrosion resistance on the inner wall,
while the 410 stainless gave the cylinder high mechanical strength (110
ksi tensile) After finish
machining, the inner wall of the cylinder was then hard chrome
electroplated (15-20 mils) for the required wear resistance.
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