Welding process of corrosion-resistant stainless steel industrial welded pipe
The base material of anticorrosive welded stainless steel welded pipe includes straight seam steel pipe and spiral steel pipe. Anticorrosive coating on the inner wall: a film applied to the inner wall of the pipe in order to prevent corrosion in the pipe, reduce frictional resistance, and increase throughput. Commonly used coatings are amine cured epoxy resin and polyamide epoxy resin. Anti-corrosion and heat-insulation coating: On the medium- and small-diameter heat-transporting crude oil or fuel oil pipelines, in order to reduce the heat radiation from the pipeline to the soil, a composite layer of heat preservation and anti-corrosion is added to the outside of the pipeline. The commonly used insulation material is rigid polyurethane foam. If the outer protective tube is a polyethylene tube, no anti-corrosion is required.
With the rapid development of excellent strip continuous rolling production and the advancement of welding inspection technology, the quality of welds is continuously improved, the types of welded steel pipes are continuously increased, and there are more areas for the replacement of seamless steel pipes. The production process of straight seam stainless steel welded pipe is simple, high production efficiency, low cost and rapid development. The strength of spiral stainless steel welded pipe is generally higher than that of straight seam welded pipe. It can produce stainless steel welded pipes with large diameter and narrow blanks, and can also produce stainless steel welded pipes with different diameters and the same width. However, compared with the straight pipe of the same length, the welding length is increased by 30% to 100%, and the production speed is low
Executive standard: 1. Technical standard for polyethylene anticorrosion layer of buried steel pipelines 2. Technical standard for polyethylene anticorrosion layer of buried steel pipelines.
Stainless steel welded pipe is suitable for pipe network of coal mine underground water supply and drainage, underground spraying, positive and negative pressure ventilation, gas drainage, fire sprinkler, etc. Waste water slag and return water delivery pipeline for thermal power plant. It has excellent applicability to the water supply piping of anti-spray and sprinkler systems. Cable protection sleeves for power, communications, highways, etc. Applicable to high-rise building water supply, heating network heating, water supply engineering, gas transmission, buried water transmission and other pipelines. Process pipelines for transporting corrosive media in petroleum transportation pipelines, chemical pharmaceuticals, printing and dyeing industries.