Temperature Derating fcator 1

[Mechotron]

Hi

I am trying ot find the temperature derating factor of the below materials

1. AISI 4140 (YTS 80K PSI)
2. MONEL K500 (YTS 95K PSI)
3. AISI 630 (YTS : 105K PSI)

The specified yeild strength are for ambient temperature. But i am trying to find the yeild strength at 120 degree and i believe it is going to change. Is there a formula or a data sheet or any method for determining the derated yeild strength.

Chellappan
Mechanical Engineer

 

[metengr]

120 deg F or 120 deg C?

 

[Mechotron]

120 degree C

Chellappan

 

[metengr]

The web sites below contain information for each alloy, with the exception of 4140.

For 630 (17-4 PH, see the data bulletin below)

http://www.aksteel.com/markets_products/stainless_precipitation.asp

For Monel K-500 (see the technical bulletin)

http://www.specialmetals.com/products/

For 4140, (SA 193 Gr B7) the YS at 250 deg F ~ 68 Ksi (ASME B&PV Code, Section II)

 

[metengr]

I also forgot to mention that Military Handbook, Mil-hdbk-5h, December, 1998 also has excellent information pertaining to strength reduction factors for 4140 and other alloys. You can search for a free copy of this document over the internet, as well.