The basic principle of bimetallic composite steel pipe: the outer base pipe is responsible for pressure bearing and rigid support of the pipeline, and the inner lining pipe is responsible for corrosion resistance and wear resistance.
The outer base pipe can be made of carbon steel pipes with different diameters and wall thicknesses according to the flow and pressure requirements of the conveying medium. Hot dip galvanized steel pipe, straight seam welded pipe, spiral pipe, seamless steel pipe for low and medium pressure fluid transportation, high pressure boiler, seamless pipe steel pipe for petroleum cracking, line pipe, etc. The diameter is generally in the range of φ20-φ1020mm, and the wall thickness is generally in the range of 2.5-50mm.
Different corrosion-resistant alloys can be selected for the lining pipe according to the chemical composition of the conveying medium. It can be austenitic stainless steel 304, 304L, 316, 316L, copper-based alloy, nickel-based alloy, Hastelloy, titanium, titanium alloy, duplex stainless steel and other new high corrosion-resistant alloy materials. The wall thickness of the lining pipe can be designed at about 0.3-5mm according to the service life and the requirements of the welding process.
