8620 yield v. temperatureI
8620 yield v. temperatureI
(OP)
I am caught without books.....and was asked:
"I recently read a paper that said; AISI-8620 has 85,000 psi yield strength
at room temperature but at 650*F it drops to below 30,000-psi yield
strength. Is this true?
ED"
Thank you,
Mike
"I recently read a paper that said; AISI-8620 has 85,000 psi yield strength
at room temperature but at 650*F it drops to below 30,000-psi yield
strength. Is this true?
ED"
Thank you,
Mike





RE: 8620 yield v. temperatureI
RE: 8620 yield v. temperatureI
If your 8620 alloy steel part was quenched and then tempered at a temperature below 650degF, then continued exposure above 650degF will essentially re-temper your part. An 8620 steel part tempered at 650degF would still likely result in an Fty well above 30ksi.
According to MIL-HDBK-5, the Fty at 650degF of a low-alloy steel like 8620 only drops to about 75% of RT properties (ref. fig. 2.3.1.1.1).
Hope that answers your question.
Terry