Hi I was wondering how heat effects the tensile strength of steel. Since there are various alloys under the banner of 'steel', I was hoping for simply a general idea of the effect, if possible. Here is a quick quote to steer us in a good direction:Most steel has other metals added to tune its properties, like strength, corrosion resistance, or ease of fabrication. Steel is just the element iron that has been processed to control the amount of carbon. Iron, out of the ground, melts at around 1510 degrees C (2750°F). Steel often melts at around 1370 degrees C (2500°F). http://education.jlab.org/qa/meltingpoint_01.html Given this, is there an equation that we can use to approximate how a steel beam supporting a given weight, would react to increases in heat? I'll take a guess and say that there are a few variables to consider, possibly: Alloy used (of course this is important since impurities and composition determines strength), width and height of the beam, manufacturing process (tempuring), temperature of and nature of the heat source, and finally the weight atop of the beam. If someone here is expert enough to fill in these variables and design an illustrative scenario, that would be great. My goal is to understand how heat effects the beam's ability to hold the weight and at what temperatures the beam will fail at. Also, if any civil engineers here know building codes and in particular what the minimum codes are for a steel beam supporting a weight, that would be nice to know. In other words, 'a steal beam must be able to support at least 3x its weight load to be used in a commerical building.' I'm looking for an answer like this. Thanks.