DN800 necked butt weld flange
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Which is cheaper, the DN800 316L butt-weld flange or the one with a 20II substrate plus a 2mm titanium lining?
Titanium lining. Titanium plates may seem expensive, but they have a low density.
The cost of titanium lining is low, after all, not much titanium is used.
The difficulty of processing, manufacturing, and inspection is not taken into account. Considering only the plate itself, and looking at its thickness – for a DN800 device that is not used under high pressure, the thickness required should not be very great, right?
The cost of titanium-lined plates should be lower. But if 316L works, then why use titanium lining? Also, titanium lining is not suitable when the temperature is high. Moreover, the titanium lining process is very important; otherwise, the lining may tear under pressure.
It’s hard to say; it depends on the quantity. If it’s a single piece or a small amount, stainless steel would be the better choice.
Used in chimneys; corrosion resistance is the only consideration
In that case, it’s better to use stainless steel directly (if it’s suitable for use). 316L steel plates cost around 20,000 yuan per ton, which isn’t expensive. As for flanges, those made from 316L forgings (which are commonly available on the market) have a final price of about 50 yuan per kilogram. It’s really difficult to determine the price of flanges produced using lining manufacturing techniques.
In addition to the forging cost, manufacturing costs must also be taken into account. For example, if there happens to be some scrap of titanium plate that’s suitable in the factory, or considering the welding process for the lining plates, as well as time costs, you can simply choose 316L – this way the forging factory can handle the production costs, and it’s ready for use right after it arrives at the factory ； If subsequent processing of the liner is used, it takes time. So, when it comes to cost, it’s better to conduct a comprehensive evaluation on one’s own