Large diameter spiral steel pipe in big size. It is the steel belt bending molding and then welded up, made into a specified size of large-caliber spiral steel pipe, and processed into a pipe, to carry out hydraulic testing, bending, flattening, and other tests, and according to the customer's requi

(1) When the pipes of the fire hydrant water supply system adopt hot-dip galvanized steel pipes with inner and outer walls, welding should not be used. When the system pipeline adopts a non-corrosion inner wall, it can be welded, but the welding of the pipeline should meet the relevant requirements.

Large-diameter steel pipes are also called large-diameter galvanized steel pipes, which refer to welded steel pipes with hot-dip or electro-galvanized layers on the surface of large-diameter steel pipes. Galvanizing can increase the corrosion resistance of steel pipes and prolong their service life.

Straight seam steel pipe refers to a welded steel pipe with one weld in the longitudinal direction of the pipe body. GB/9711.1 stipulates that when the diameter is greater than 914.4, the straight seam steel pipe can have two straight welds, and the angle between the welds is 180 degrees. The weldin

1. Mainly use wire brushes and other tools to polish the steel surface. The cleaning and preheating of spiral welded steel pipes can remove loose or raised scales, rust, welding slag, etc. Hand tool de-rusting can reach the Sa2 level, and power tool de-rusting can reach the Sa3 level. If the iron ox

Galvanized Steel Pipe with extraordinary anti-corrosion characteristics, strong adhesive zinc coating, evenly covered zinc coating on the internal and external pipe surface, and a long lifetime.Product name: galvanized steel pipeSize: 200x4x12000mmStandard: ASTM A53Application: Industrial Constructi

Pre-welding of straight seam steel pipes: pre-welding includes seams and welds.1. The joint (that is, the forming seam) has no misalignment or the misalignment is less than the specified value. Generally, the amount of misalignment is ≤ 8% of the plate thickness, and the maximum is not more than 1.5

A detailed explanation of the welding process of large diameter straight seam steel pipe:Double-wire automatic welding of straight seam steel pipe is a welding technology developed in recent years. In addition to the characteristics of semi-automatic single-wire welding, it also has welding characte

1. Metallurgical properties of materialsThe raw material for the production of spiral welded pipes is hot-rolled coils, and the straight seam welded pipes are made of steel plates. The weight of the alloy contained in the coil is less than that of the steel plate. It is for this reason that the spir

1. Rolling method: Stainless steel pipe bending generally does not require a mandrel, and is suitable for the inner round edge of thick-walled stainless steel pipes.2. Roller method: place a mandrel in the stainless steel tube, and push the outside with a roller at the same time.3. Stamping method: