Regarding the material upgrade of steel chimneys
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Dear everyone: Basic parameters of the steel chimney: height of 70 meters, diameter of 2.5 meters (lower section, Q245r, 24 mm) and 1.5 meters (upper section, Q245r, 18 mm); temperature is 90 degrees, with a transition section in between； It has no lining nor tension cables, and is severely corroded; I want to upgrade the entire material to 304 ； Do we still need to find a designer, or can we just change the material while keeping the original design? Thank you
If you have enough money, use titanium-steel composite panels; 304 steel isn’t suitable as it has slightly poorer corrosion resistance and is more expensive. If the budget is limited, use ND steel with a glass phosphide lining for corrosion protection.
Be sure to have a qualified design firm carry out the calculations and produce drawings. Otherwise, you won’t be able to afford the consequences if something goes wrong during the process.
Use a titanium-steel composite material – it’s 1.5 titanium combined with carbon steel plates that have been subjected to explosive rolling. The overall cost is similar to that of 304 material, and its service life is extremely long. Our company is capable of producing this; we have completed several projects involving lengths of 100 meters each
No, the strength of S30408 is lower than that of Q245R. Also, what causes corrosion if the flue gas contains HCl? Changing to 30408 didn’t work.
Steel chimneys are generally considered as part of the civil engineering structure; there is no need for a container-based design, and the applicable standards are different