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
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
RE: Elevated Temperature Yield Strength AISI 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
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
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
Regards,
Cory
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