The strength of steel remains essentially unchanged until about 600°f. The steel retains about 50% of its strength at 1100°f. The steel loses all of its capacity when it melts at about 2700°f. However, for design purposes, it is usually assumed that all capacity is lost at about 2200°f.
Structural Steel Will Fail at What Temperature?
In the United States, the maximum temperature at which structural steel can safely be used is 1,000 degrees Fahrenheit.
This is the temperature at which the steel will start to lose its strength and can no longer support the weight of the structure. The steel will begin to deform and will eventually fail.
There have been a few instances where structural steel has been exposed to temperatures above 1,000 degrees Fahrenheit.
In the World Trade Center disaster, the steel was exposed to temperatures of 2,000 degrees Fahrenheit. The steel did not fail immediately, but it did lose a significant amount of its strength.
The steel eventually cooled and regained some of its strength, but it will never be as strong as it was before it was exposed to the high temperatures.
In order to prevent structural steel from failing at high temperatures, it is important to use proper design and construction techniques.
The steel should be properly reinforced and should be able to dissipate the heat quickly. The building should also be designed to limit the amount of heat that the steel is exposed to.