Stainless Steel Composite Material For Deepwater Desalination Coal Chemical Industry

Pipe

Composite method

Features

Lined with stainless steel

Composite steel pipe

Mechanical complex

The disadvantage is that :

(1) Due to the low bonding force of the inner and outer layers, as a long-term transportation pipeline, due to the different thermal expansion coefficients inside and outside, the thermal stress caused by temperature changes is concentrated on the welded part of the pipeline joint, resulting stress corrosion problems that cannot be overcome;

(2) The composition difference between the inner prefabricated thin-walled tube and the base material leads to Increased risk of electrochemical corrosion;

(3) Once a corrosion leak occursIt cannot be repaired by welding, and the corrosive liquid will spread along the entire bonded layer gap in a large area;

(4) The non-destructive testing of welds is complex,need to useX-Rays(RT) detected twice, after completing the second welding and the cover welding, it can be ensured that there are no defects in the weld;

(5) Under high temperature environments, due to the difference in expansion coefficient between carbon steel and stainless steel layers and the presence of interlayer gases, the inner cladding layer is unstable and bubbles occur;

(6) Lined welded pipe is in welded and cold-worked state, so that reduces its corrosion resistance;

(7) Mechanically bonded structure making it cold and hot processing cannot be used to manufacture elbows, tees and other accessories.

Double-sided stainless steel

Composite steel pipe

Metallurgy complex

The advantages of overcoming the above disadvantages of lined stainless steel composite steel pipes, include:

(1) Can utilize tubing On-site production of small-angle elbows;

(2) Can open holes at any position to connect branch lines or instruments;

(3) once the pipeline’s if a point is damaged and leaks, only the point needs to be repaired;

(4) Weld seam non-destructive testing is simple, only need to only once after cover welding;

(5) High bonding strength, strong oxidation resistance and high corrosion resistance, cold and hot processing can be used, and the elbow accessories are complete.