S-N Curve for BS970 817M40T

[ghalstead]

I am trying to locate any S-N curve data for BS970 817M40T or equivelant, I believe AISI 4340 is nearly identical. The requested data is to enable some preliminary fatigue calculations to be done, prior to aquiring proper S-N data for a worst case material condition.

Below is typical material mechanical test data for five components.

Please note material diameter is 480mm or 19" which puts it outside the normal ruling section

1 2 3 4 5
------------------------------------------------------
Tensile N/mm2 945 937 954 922 904
Yield N/mm2 757 724 766 724 702
Elongation % 16 16 17 17 16
Reduction of Area % 64 41 48 47 42
Charpy @ 20 C Joules 44 55 49 51 64
Charpy @ 0 Deg C Joules n/a 33 33 39 40

Any data or comments would be appreciated

 

[TVP]

MIL-HDBK-5 has quite a bit of information available on fatigue properties of 4340:

http://www.grantadesign.com/MILpdfs/MIL5-H/MIL5H-2-3.pdf

 

[chrisbullough]

ESDU would be a good source for such data, but you need to be members.

http://www.esdu.com

 

[Carburize]

There is a lot of data on 4340 in "Atlas of Fatigue Curves" Edited by H.E.Boyer and available from ASM