The weld seam of the spiral steel pipe is longer than that of the straight seam steel pipe. If the pipe length is L, the weld seam length is L/cos(θ). However, most of the defects of steel pipes are concentrated in the weld seam and the heat-affected zone. The long weld seam means that the probabili

(1) Raw materials are strip steel coils, welding wires, and fluxes. Before putting into use, they must go through strict physical and chemical tests.(2) The head-to-tail butt joint of strip steel adopts single-wire or double-wire submerged arc welding, and automatic submerged arc welding is used for

With the continuous development of my country's economy, the country vigorously develops the energy industry. Long-distance oil and gas pipelines are an important way of energy protection. During the anti-corrosion construction process of oil (gas) pipelines, the surface treatment of steel pipes is

1) The type, specification, and quality of stainless steel pipes, components, and welding materials must meet the design requirements and specifications.2) The positions of supports, hangers, and brackets should be correct, flat, and firm, and the backing plate in contact with the pipe should be mad

The installation method of stainless steel pipes is the same as that of ordinary carbon steel, and some processes have the following process requirements.1 Stainless steel materials should not be in direct contact with other metals when being lifted and should be padded with non-metallic materials s

Welded steel pipes are mainly divided into three processes: electric resistance welding (ERW), spiral submerged arc welding (SSAW), and straight seam submerged arc welding (LSAW). The welded pipes produced by these three processes have their positioning and advantages in the application field due to

1. Shoddy steel product is prone to folding. Folding is a variety of fold lines formed on the surface of the steel, and this defect often runs through the longitudinal direction of the entire product. The reason for the folding is that the counterfeit and inferior manufacturers pursue high efficienc

1. Cleaning method: When cleaning the surface of the stainless steel pipe, care must be taken not to scratch the surface. Avoid using bleaching ingredients and abrasive washing liquid, steel wire balls, grinding tools, etc. To remove the washing liquid, rinse with clean water at the end of the washi

Seamless steel pipes are widely used. 1. General-purpose seamless steel pipes are rolled from ordinary carbon structural steel, low-alloy structural steel, or alloy structural steel, with the largest output, and are mainly used as pipes or structural parts for conveying fluids. 2. There are three ty

1. Straight seam high-frequency welded steel pipe: Straight seam high-frequency welded steel pipe is a welded steel pipe that is continuously produced on the production line using steel strip (coil) as the raw material and high-frequency welding process. The material strength is generally below 450M