Why is stainless steel not suitable as a heat-resistant steel for design temperatures of 500°C or less?
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The last edit to this post was made by fzujunru on 2017-11-1 at 13:27. Section 5.1.6 of SH/T 3075-2009, \"Specifications for the Selection of Materials for Steel Pressure Vessels in the Petrochemical Industry,\" states that stainless steel should not be used as a heat-resistant steel for design temperatures of 500°C or less; section 5.1.7 adds that it can be used as a heat-resistant steel for temperatures above 500°C. It’s not advisable to use it below 500 degrees; it must be due to more than just economic reasons, right?
It should mainly be about cost-effectiveness...
In the sensitization temperature range of 450–850°C for stainless steel, intergranular chromium depletion is likely to occur
Some stainless steels lose strength at this temperature, but those of special quality can meet the requirements
It is mainly for economic reasons; there is no need to use stainless steel when chromium-molybdenum steel can be used.
It is not advisable to use it below 500 degrees, mainly due to economic considerations.
Stainless steel can generally withstand high temperatures, but it is not necessarily the most cost-effective option; it is \"not suitable\" for temperatures below 500°C. Intergranular corrosion resistance and high-temperature resistance are not the same thing. High temperature resistance usually requires \"high carbon\", while resistance to intergranular corrosion requires \"low carbon\".
The reply on floor 7 is incisive. Resistant to high carbon and resistant to low crystal carbon. Easy to understand
Generally, stainless steel cannot withstand temperatures of 500 degrees for a long time, but 310S can.
Under normal circumstances, chromium-molybdenum steel is used when corrosion resistance is not required; 310S is used only when corrosion resistance is necessary