1.    The replacement scope of super-ferritic stainless steel welded pipe

As condenser tube, super-ferritic stainless steel tube has large advantage of the price compared with titanium tube, in the same performance conditions can be accepted by users. The current titanium tube condenser on the market can instead of super-ferritic stainless steel welded pipe in the target market. Although the price of super-ferritic stainless steel is slightly higher than the 317L stainless steel, but the advantage of stress corrosion such as chloride resistance can be offset the part of the price factors, it can be used as a potential alternative to the market.
  

In clean sea water such as seawater desalination and ship manufacturing, the condenser tube used in practice is still a copper alloy tubes on the market. But copper prices continued to rise, from 15,000 yuan / ton of 2000 rose to the current 50,000 yuan / ton, the cost is no longer competitive compared with the stainless steel, but because of equipment design, national standards and other factors, it can be expected in the near future, stainless steel pipe will instead of copper tube progressively in the desalination of sea water and in the area of shipbuilding, the field of sea water desalination and shipbuilding will be of the next big potential market for super-ferritic and duplex stainless steel tube.
            
Super-ferritic stainless steel compared with the competitive materials

Specification / Price (RMB / ton, Specific Weight, Amount alternative coefficient, Overall alternative coefficient  (including price)
Titanium pipe:  φ25 × 0.5 55 4.51 1 1
Stainless steel welded pipe:  φ25 × 0.6 13 7.7 1.71 0.484
Stainless steel welded pipe :  φ25 × 0.6 8 7.7 1.71 0.298
Navy brass:  φ25 × 1 7 8.9 3.95 0.538
Super-ferritic stainless steel welded pipe:  φ25 × 0.6 15 (estimated) 7.7 1.71 0.558

For example, 600MW unit, it is expected to require 80 tons of titanium tubes, compared with the same cooling area: