Water Pump Shaft Materials

Posted by Bob Bidonde on August 31, 1998 at 06:55:25

In Reply to: Re: Water pump Stainless Steel Shafts---readily done
posted by carla on August 27, 1998 at 15:36:46

Carla,
If you are going to the trouble of making water pump shafts, I suggest that you consider using the following metals instead of martinsitic 440A. Although 440A has a bit better gaulling resistance than typical stainless steels, I feel there are better choices:
(1) austinitic stainless, Gall-Tough. It is formul;ated to resist the galling failure typically caused by the action of the roller bearing at the front of the Model A's water pump. It has a corrosion resistance similar to Type 304 Stainless;
(2) perhaps the best choice is AerMet 100, a tough and corrosion resistant nickel-cobalt alloy strengthened by carbon, chrome & molybdenum. It is equal to 300M alloy in strength with better fracture toughness & better stress corrosion resistance. AerMet is used to make aircraft engine shaft including high torque crankshafts.
Carpenter Steel of Reading, Pa is a source of these steels. Try calling 800-527-6900 or ask your local steel supplier for these materials.
Good luck with this project.
Bob Bidonde