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Shaft Mat'l - ANSI 4140 vs 4150 ?

Shaft Mat'l - ANSI 4140 vs 4150 ?

Shaft Mat'l - ANSI 4140 vs 4150 ?

(OP)
I'll post this in a couple forums.
We're looking at pump shafts, under 6" bar size. Other than the 10 points difference in Carbon content (per ASTM A29), I can't find an appreciable difference between 4140 and 4150 until you get around 8" bar size where tensile differs a little.

Assuming non-resulfurized, is there any reason - such as machining - that makes one better?
Thanks!

Keep the wheels on the ground
Bob
showshine@aol.com

RE: Shaft Mat'l - ANSI 4140 vs 4150 ?

The higher carbon content of the 4150 gives the potential for higher hardness but this comes with the penalty of a material which is more prone to quench cracking. If you can get the hardness/strength that you need from the 4140 then in my opinion there is no benefit in using the 4150.
I use a lot of 4145 which develops good properties up to 10-inch diameter and, when oil quenched, few problems of quench cracking.

RE: Shaft Mat'l - ANSI 4140 vs 4150 ?

sprintcar (Mechanical)

Response from carburize is right on. Be very careful if the part is heat treated after machining and has any groves , small radii or rapid section change. A 6 in shaft is quite large, if highest performance is needed, consider 4340 which is deep hardening.

RE: Shaft Mat'l - ANSI 4140 vs 4150 ?

(OP)
Generally the parts are not post-machined heat treated, since some are made offshore. We estimated about 4% lower strength for the 4140 in the larger sizes.
Gearman is right, but the cost increase for 4340 creates a problem.
Thanks guys!

Keep the wheels on the ground
Bob
showshine@aol.com

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