seamless steel pipe
Structural steel pipes are divided into two categories: seamless steel pipes and welded steel pipes. Welded steel pipes are made of steel strips and are divided into straight seam welding and spiral welding according to the pipe diameter.
Straight seam welded pipes are not as regular as seamless pipes. The centroid of the welded pipe may not be in the center. The probability of defects in the weld of the welded pipe is relatively high. The important parts cannot replace the seamless pipe. The wall thickness of the seamless pipe cannot be made very thin due to the limitations of the processing technology.
① In terms of appearance, the difference between seamless steel pipe and welded pipe is whether there is a weld.
② The working pressure of seamless steel pipe is higher, and the working pressure of welded steel pipe is generally around 10 MPa.
③ Seamless pipe is formed in one step. Welded pipe must be welded after production. Generally, smaller diameter welded pipes mostly use straight seam welding, and large diameter mostly use spiral welding.
④ Seamless steel pipes are suitable for occasions with higher requirements, such as petroleum, chemical industry, aviation and other fields, while spiral pipes are suitable for occasions with relatively low requirements, such as construction, bridges, water conservancy and other fields
Seamless steel pipe is made by heating, perforating, rolling and other processes of steel billet. It has a smooth surface, no welds, high pressure resistance, corrosion resistance, and is suitable for use in extreme environments such as high pressure, high temperature, low temperature, and corrosion.
It is widely used as a pipeline for conveying fluids, especially pressure pipelines and structural force-bearing rods in construction projects, etc. It is suitable for various projects.
Seamless pipe specifications: 6-1240× 1-200mm
Outer diameter range 6-1240, pipe wall thickness between 1-200
Seamless pipe manufacturing process: hot rolling, cold drawing, hot expansion
Application: transportation (water, oil, gas and other fluids), boilers, oil cracking, geological drilling, diamond core drilling, oil drilling pipes, etc.
Material: 20#, 45#, 16Mn (Q345B), Q345D, Q345E, 40Cr, 20G, 27SiMn, L245N
It can be divided into straight seam welded pipe and spiral welded pipe. It can be used in fire water supply network. It has the advantages of high strength and strong strain resistance, but its corrosion resistance is poor and should be treated with anti-corrosion.
The strength of spiral welded pipe is generally higher than that of straight seam welded pipe. Smaller diameters use straight seam welding, while large diameters use spiral welding.
Straight seam pipe is made of iron plate, which is produced through processes such as bending, closing, and welding. It has a longitudinal weld seam, simple production process, high production efficiency, low cost, and rapid development.
Straight seam pipes are usually treated with galvanizing or coating to extend their service life. This allows the straight seam pipes to maintain their good performance in humid, acidic or alkaline environments and are not easily affected by corrosion.
Straight seam pipe is widely used in various fields of civil engineering, such as bridges, tunnels, subway track laying, water conservancy dam repair, urban rail transit construction and other engineering projects. It has good corrosion resistance and wear resistance.
Spiral steel pipe is a spiral seam steel pipe made of strip steel coils, extruded at room temperature, and welded by automatic double-wire double-sided buried welding process. It is commonly used in pipelines for transporting fluids such as rainwater, sewage, and petroleum, and is usually called a fluid pipe.
It can be used for heat preservation, community heating, thermal network laying, and power plant steam transmission. Spiral steel pipes can be processed into anti-corrosion, tap water pipes, and underground sewage.
Five Hidden Dangers in Steel Structure Welding 1. Different thicknesses of the plate docking,…