ASTM A284 Properties at 300¦C.

[22west]

Can anyone direct me to where I can find the yield strength of ASTM A284 steel when it is exposed to air flowing at 300°C?

The composition (%Wt) of A284 steel is

C 0.24 - 0.36
Fe 98
Mn 0.9 Max
P 0.04 Max
S 0.05 Max
Si 0.28

 

[Carburize]

I can't find any absolute numbers for this alloy but I believe that a good estimate would be 90% of the room temperature value.

 

[TVP]

The 90% value that Carburize suggested is a good one. ASM HANDBOOK Volume 1 has a graph for a 0.17 % carbon steel that showed about a 10 % loss of tensile strength at ~ 400 C, so I would use that as an approximation.

 

[rustbuster1]

The well-respected ASME Boiler and PV Code stipulates the same max. allowable stress for carbon steels of this type up to 350C.

You should take this to indicate that the yield and tensile strengths - which are the basis for the max. allowable stress - are essentially unchanged, i.e.,do not decrease to any significant degree between room temperature and 300C.

 

[22west]

Much appreciated for the help.
This was exactly what I was looking for.