3 ms·
Soften "slightly", but enough to make the building which that steel is holding up collapse...
by rob74 3y ago
Soften "slightly", but enough to make the building which that steel is holding up collapse...
- pfdietz 3y agohttps://www.steelconstruction.info/Fire_damage_assessment_of_hot_rolled_structural_steelwork https://www.steelconstruction.info/Fire_damage_assessment_of... "Strength loss for steel is generally accepted to begin at about 300°C and increases rapidly after 400°C. By 550°C steel retains approximately 60% of its room temperature yield strength, and 45% of its stiffness. At high temperatures, steel is also subjected to significant thermal elongation, which may lead to adverse impacts, especially if it is restrained." At 800 C ("dull cherry red"), the yield strength is down ~90%: https://www.steelconstruction.info/images/9/99/Steel_strength_in_fire.png https://www.steelconstruction.info/images/9/99/Steel_strengt... This is talking about short term properties of steel, which would be important in building fires, but creep also increases with temperature.