Effect of Heat on Structural Steel
Effect of Heat on Structural Steel
(OP)
Does anyone know a general rule of thumb to what the effect of heat is on A36 Structural Steel? What temperature does it start to carbonize, and what temperature does it begin to fail?






RE: Effect of Heat on Structural Steel
I know that there are temperature-load carrying capacity tables published for bolts; I'm sure they'd have the same for other shapes/grades.
RE: Effect of Heat on Structural Steel
I believe you start running into strength losses in excess of 10% above 1000 degrees farenheit, and the losses increase markedly as you progress to a total failure around 2000 degrees or less. Don't qoute me on that though - check the archives.
Mike McCann
McCann Engineering
RE: Effect of Heat on Structural Steel
Fy(A36) @ 400 deg. F. is about 33 ksi
Fy(A36) @ 800 deg. F. is about 16 ksi
These are the values that I have been exposed to and have used, but it would be great if someone else could verify these.
namanges
RE: Effect of Heat on Structural Steel
Temperature(°F) Yield Strength(ksi) Tensile Strength(ksi)
-20 to 100 36.0 58.0
150 33.8 58.0
200 33.0 58.0
250 32.4 58.0
300 31.8 58.0
400 30.8 58.0
500 29.3 58.0
600 27.6 58.0
650 26.7 58.0
700 25.8 58.0
750 24.9 57.3
800 24.1 53.3
850 23.4 48.5
900 22.8 43.3
950 22.1 38.0
1000 21.4 33.4
Although exposures above 800°F will result in the carbide phase converting to graphite. Also, above 700°F, time dependant effects (creep) become important.
RE: Effect of Heat on Structural Steel
RE: Effect of Heat on Structural Steel
Some time ago I recall that steel begins to change properties at about 600 degrees F. This was about the same temperature it took to light an unlit match by touching to the steel.
Regards,
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RE: Effect of Heat on Structural Steel
RE: Effect of Heat on Structural Steel
RE: Effect of Heat on Structural Steel
Temperature Modulus of elasticity
<70°F 27.9 x 106 psi
<200°F 27.7 x 106 psi
<300°F 27.4 x 106 psi
<400°F 27.0 x 106 psi
<500°F 26.4 x 106 psi
<600°F 25.7 x 106 psi
<700°F 24.8 x 106 psi
For Carbon Steel with carbon content above 0.30;
Temperature Modulus of elasticity
<70°F 29.9 x 106 psi
<200°F 29.5 x 106 psi
<300°F 29.0 x 106 psi
<400°F 28.3 x 106 psi
<500°F 27.4 x 106 psi
<600°F 26.7 x 106 psi
<700°F 25.4 x 106 psi
RE: Effect of Heat on Structural Steel