How does yield strength of structural steel varies with temperature
How does yield strength of structural steel varies with temperature
(OP)
I need to find out how the yield strength of structural steel varies with temperature. When the temp. is 500 - 600 degrees C, what will be the yield strength? I understand it goes down, but how much, I don't know.Are there any references I can use? I greatly appreciate your response.






RE: How does yield strength of structural steel varies with temperature
Don't have it handy but AISC has some values for this, I remember looking it up when the whole world trade center discussions were going on (ie the whole jet fuel thing)...
RE: How does yield strength of structural steel varies with temperature
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RE: How does yield strength of structural steel varies with temperature
RE: How does yield strength of structural steel varies with temperature
RE: How does yield strength of structural steel varies with temperature
In particular, Table A-4.21 addresses your question. At 538 deg C (1000 F), the yield strength is reduced by a multiplier of 0.66 (the steel has 66% of its yield strength at 538 deg C compared to its strength at 20deg C)
RE: How does yield strength of structural steel varies with temperature
RE: How does yield strength of structural steel varies with temperature
All the best
RE: How does yield strength of structural steel varies with temperature
at that heat I would also check that there are not any metallurgical issues.
RE: How does yield strength of structural steel varies with temperature
RE: How does yield strength of structural steel varies with temperature
I had a class once on performance design of structures under fire conditions. If I remember correctly we had the following:
Theta = (steel temp - 20)/1000
Revised E = E(1-2.04*theta^2)
Revised Fy = Fy(1-0.78*theta-1.89*theta^4)
With the steel temp in C. The trick was getting the steel temp which was a little difficult and based upon testing done in Europe.
So for steel at 600 degrees C you would have a revised E of 9,000ksi and a revised strength of 16.7ksi (starting with 50ksi material.
Don't quite remember where it came from during the class.... but this is a formula we had to use extensively for projects and homework.
RE: How does yield strength of structural steel varies with temperature
If you have a specific steel composition, I can reproduce those values for you here, if you would like. (I should note, though, that the yield and ultimate values only go to 100°F/537.8°C). Of course, beyond those values for most steels, creep (even short term creep) will dominate.