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Elevated Temperature Yield Strength AISI 1340

Elevated Temperature Yield Strength AISI 1340

Elevated Temperature Yield Strength AISI 1340

(OP)
Does anyone know what the yield strength of 1340 steel would be at 1500 deg F?
How about 4140 at the same temperature?

The best info I can find tells me it should be around 10,000 PSI for either material.  Anyone have any better data?

Thanks

rp

RE: Elevated Temperature Yield Strength AISI 1340

just saw your posting - I'll check tomorrow, I don't have the source with me right now.

RE: Elevated Temperature Yield Strength AISI 1340

okay - nothing on 1340 - sorry - if it helps ASTM A 829 is equivalent to 1340.  

For steels with over 0.3% carbon I do have some info on the modulus - it drops well below 15x10^6 psi above 1200-F I don't know about its suitablility for use over 1200 F

Sorry - nothing on 4140 - guess I wasn't much help

RE: Elevated Temperature Yield Strength AISI 1340

Some limited data on 4140: 1500 F is in 4140's annealing range. Extrapolating wildly, the yield strength could be reduced to 3-6% of it's RT value. (This is from MIL-HDBK-5, and may not really be appropriate for annealed properties, never mind the extrapolation. The temperature knockdown graph goes up to 1200 F, where yield is 22% of RT.)

According to ASMH, the RT annealed strength of 4140 is 60 ksi. The strength at temperature data in ASMH only goes up to 1000 F max. However, ASMH gives creep for annealed material at 1200 F. At 1200 F and 10 ksi you'd be greeping at 1% strain an hour, and the creep rates are shooting up. It looks from that as if 4140 at 1500 F isn't really good for much in the way of load. (Kind of unsurprising. NB: max use temperature is about 1025 F for softer tempers.)

RE: Elevated Temperature Yield Strength AISI 1340

(OP)
Thanks for the help.

I have a shaft made from either 1340 or 4140 (will get an analysis soon) that failed in tension.  Reports are that the mateial may have exceeded 1500 deg F during service and I am trying to determine what the load was at failure.

rp

RE: Elevated Temperature Yield Strength AISI 1340

Table 2 in ASM Handbook Volume 14 Forming and Forging, section Precision Forging -> Selection of Process Temperature shows the Yield Stress of 4140 at 1500 °F to be 11 ksi.

Regards,

Cory

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