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8620 yield v. temperatureI

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

RE: 8620 yield v. temperatureI

No. However, what do you think?

RE: 8620 yield v. temperatureI

mikerock,

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

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