Fatigue Properties of 1.6582 (AISI 4140 V.S 1.6582) 1

[Armanhk]

HI
I'm looking for a material to substitute our 4140 shafts. These shafts are working with 12000 rpm. Now we use of 4140 (quenched and tempered).
Is it possible to use 1.6582 instead of 4140???
Is Fatigue properties and core toughness of 1.6582 better of 4140???

Thanks

 

[metengr]

The 34CrNiMo6 (1.6582) low alloy steel appears similar to 4340. This is a high hardenability, alloy steel that can be heat treated to tensile properties that exceed 4140 steel. You can continue the comparison by searching 4340 steel versus 4140 steel.

http://www.steelnumber.com/en/steel_composition_eu.php?name_id=196#1

thread330-344356

 

[EdStainless]

Think about the factors in fatigue, geometry, steel internal cleanliness, and strength.
Higher strength helps, but only if the other two factors area also in your favor.

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P.E. Metallurgy, Plymouth Tube

 

[Tmoose]

Some pictures and drawings of your arrangement and the cracked/broken shafts could possibly result in even more helpful replies.

 

[metengr]

4340 steel, is a high strength steel which can be supplied quenched and tempered to provide high strength and impressive notch toughness and ductility because of nickel as an alloying element.

The 4340 can be excellent shaft material, if you require it, because of the deep hardenability it possesses. You can find fatigue properties for comparison and the 4340 will typically win out.

 

[Armanhk]

Thans 4 ur comments