Material properties at high temperature

[MGZmechanical]

Hello. I'm designing a damper (low pressure valve not covered by the pressure equipment directive) for 400 ºC. The material is standard S275JR, low carbon steel. Now i'm having a problem, there's no "official" data for this material at that temperature. I've seen two references:
- Eurocode for steel structures, fire design, tells that at 400 ºC the yield strentgh if 0,42 the one at room temperature.
- Pressure equipment directive says that for steels with no data guarantee at high temperatures the yield stentgh at 300 ºC is 0,42 the one at room temperature. And gives no clue above 300 ºC.

On the other hand I haven't found any supplier whi gives values for this material at high temperature.

Does anyone has experience using low carbon steel at high temperature? Does anyone know why there can be this difference between norms?

Regards

 

[boo1]

Stress-strain behaviour of carbon steel at high temperatures is essentially different from that at ambient temperature. Test results show that carbon steel begins to lose strength at temperatures above 300°C, see link at

http://www.mace.manchester.ac.uk/pr...HotRolledCarbonSteel/mechanicalProperties.htm

The S275 steel retained 50% strength at a temperature of 550°C, this is consistent with literature values.

Cheers

 

[MGZmechanical]

Hi, thanks for the reply. Finally I used the Eurocode for steel, fire design.

thanks