【BRIEF INTRODUCTION】Seamless steel pipes can be used to transport fluids (such as natural gas, oil, water, etc.), some solid materials, etc. It is an economical steel material that uses steel pipes to make grids, supports, and mechanical supports for building structures

Seamless steel pipes can be used to transport fluids (such as natural gas, oil, water, etc.), some solid materials, etc. It is an economical steel material that uses steel pipes to make grids, supports, and mechanical supports for building structures. The use of seamless steel pipes as building materials can reduce costs. Today, the editor will collect and organize relevant content on the differences between seamless steel pipes and welded steel pipes for your reference.

Seamless steel pipe refers to the production of steel pipes that are made of wool pipes made by piercing steel ingots or solid billets, and then made by hot rolling, cold rolling, or cold drawing, with no gaps in the pipe walls; Welded steel pipe refers to a secondary welding joint that bends a steel strip or steel plate into a circular or square shape and then welds it onto the surface or inner wall of the steel pipe. In short, compared to welded steel pipes, welded steel pipes are made by welding steel strips, while seamless steel pipes are made by hollowing out whole round steel without welding.

1. Seamless steel pipes and welded steel pipes have different processing techniques. Seamless steel pipes are made of high-quality carbon steel or alloy steel; There are two processing methods for seamless steel pipes: cold drawing and hot rolling, and the seam pipes are generally welded.

Seamless steel pipes and welded steel pipes have different purposes. Seamless steel pipes are mainly used for pipelines or structural components that transport fluids, mainly in the mechanical industry; Jointed steel pipes are mainly used for the transportation of fluids and gases in the construction industry, such as low-pressure fluids such as water, gas, compressed air, etc. Pressure pipes are generally made of seamless steel pipes.

In general, the working pressure of slotted steel pipes can be below 20 kilograms, which belongs to the safe range of use and is usually used for low-pressure fluids such as water, gas, compressed air, etc; Seamless pipes can withstand ultra-high pressure, but of course, their wall thickness will also increase. This requires design according to the required pressure, and are often used in high-temperature and high-pressure equipment such as high-pressure pipes and boiler pipes. According to the design requirements, there are also seamless pipes in the structure.

At present, there are several types of seamless steel pipes with joints. The welds are annealed and the pressure range is basically equal to the pressure range of seamless steel pipes. There are also some seamless steel pipes in the market that are pulled or rolled into seamless steel pipes with smaller specifications after overall heating. This type of steel pipe is only seamless in appearance, and its essence is not very ideal.

4. Different usage of seamless steel pipes and welded steel pipes. Seamless steel pipes are made by cold drawing and hot drawing, and are generally used in situations where the medium pressure is equal to or greater than 1.6 MPa. The welded steel pipe is formed from steel plates and butt welded with high-frequency welding, suitable for medium pressures below 1.6 MPa.