Maximum Allowable Working Temperature for Steel

Steel does not have a 'maximum allowable temperature' per-se. It DOES have maximum allowable temperatures for given design stress. ASME codes are quite specific and should be the reference used.

Resuming what was mentioned, depends on the steel and the application. Its not a matter of a table or software, but where it is used, harzard assessment, if it is subject to some standard or not, production scale and manufacture needs, long or short term endurance and - of course - target costs.

Here is a good start.

IRONCARBIDEEQUILIBRIUM

Here is a thought:

Understand the application and the role of form and mechanical properties.

As a general rule, Engineers want the part to behave as designed in a given circumstance. When the form or dimensions is changed because of a phase change, or stress relaxation, or part has yielded under stress; or when properties have changed because of phase change, stress relaxation, or strain hardening, or fatigue, or the material has 'crept' or 'yielded', The part cannot be expected to function as designed.

Based on the chemistry, predominately the carbon content, one can decipher many things from the diagram given above. As wiser folks have posted ahead of me, the codes are engineering consensus based on years of experience with steel construction.

If there was such free software, it would be totally misapplied by non-engineers.

One point of clarification, when you say "worked" most people conclude you mean "working temperature at final application." Most steel mill guys will interpret "worked" as the temperature at which the last step of shaping or processing can take place (ie. hot rolling is hot work.)

A bit more clarity or insight into what you mean/are trying to do could help avoid such confusion.

milo

"A bit more clarity or insight into what you mean / are trying to do could help avoid such confusion."

This should be at the head of each dialogue box, IN CAPS!

Lyn

For more clarification I give the friends an example:

Suppose you want to construct a special fixture to install into a furnace, the corrosive environment (or other reasons) makes you to use a type of stainless steel. Temperature is about 650 °C (It is evident the temp. is just an example, so it could be more or less than 900).I think it is clear that for starting and going on design calculation(ex. Stress and so on) you need to select material and following, Yield or tensile strength and the other parameters like these. So there possibly must be a way to find a relation or correlation between maximum allowable working temperature (in this example furnace temp.) and type of steel to start the design process. Maybe some guys suggest "recrystalization temperature" is a good criterion .If it is, how about you? And is there any reference to find it?