1. Different definitions:Long-radius steel elbow: Long-radius steel elbow means that the radius of curvature of the elbow is 1.5 times the diameter of the pipe; if it is greater than 1.5 times, it is in the category of elbows.Short radius steel elbow: The short radius steel elbow means that the radi

1. Welding process: In the welding process, the welding method of the spiral steel pipe and the straight seam welded pipe is the same, but the straight seam welded pipe will inevitably have many T-shaped welds, so the probability of welding defects is greatly increased. The welding residual stress i

Steel elbows are divided into welded and seamless. The main difference lies in the raw materials. Seamless steel elbows are made of seamless pipes. Welded steel elbows refer to butt-welded steel elbows and straight seam steel elbows.The difference between the butt-welded steel elbow and the seamless

Galvanized steel pipe, commonly known as cold-galvanized pipe, adopts an electroplating process, only the outer wall of the steel pipe is galvanized, and the inner wall of the steel pipe is not galvanizedThe hot-dip galvanized steel pipe adopts the hot-dip galvanizing process, and the inner and oute

(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.

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

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

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. Generally, large-diameter thin-walled steel pipes are used for the transportation of general lower-pressure fluids such as water, gas, air, oil, and heating steam.2. Ordinary carbon steel wire casing (GB3640-88) is a steel pipe used to protect wires in electrical installation projects such as ind

Precision stainless steel tubes are very characteristic in model specifications and appearance performance. First of all, the thicker the tube wall of this type of stainless steel tube, the higher its cost performance and practicability, and the thinner the tube wall, the processing cost will be gre