Seamless pipe and ordinary welded pipe
April 10, 2023
1、 Seamless pipe
1. Production process
Seamless pipes are produced through processes such as pickling, oil immersion, heating, rolling, and cooling on a seamless rolling mill, without transition zones or inner edge welding. It does not require welding during the production process and has strong overall performance. The iron film maintains the composition of the steel well, without inevitable defects such as pores, defects, and cracks. Therefore, it has high strength, corrosion resistance, and accuracy.
2. Material properties
Seamless pipes have good strength, toughness, and plasticity, especially for applications in extreme environments such as high temperature, high pressure, and low temperature, making them more stable and reliable. Its surface is smooth, free from bumps and oxide layers, with reliable quality and easy to clean. Generally speaking, seamless pipes have a longer service life and can avoid premature failure as long as appropriate maintenance is carried out.
3. Scope of use
Seamless pipes are commonly used in fields such as oil, natural gas, chemical industry, machinery, shipbuilding, and automobiles, and are also important components of some high-end industrial equipment. This type of pipe is suitable for extreme environments and needs to withstand extreme conditions such as high pressure and high temperature. It has higher safety than ordinary welded pipes and is an indispensable choice for enterprises to replace high-risk pipelines.
2、 Ordinary welded pipe
1. Production process
Ordinary welded pipe is a pipe made by welding steel strips, and its production process is formed by twisting steel strip arc shaped steel pipes. Due to the overall strength not being the same as that of seamless pipes, it is necessary to connect the pipes through welding, and the pipe clamps are directly formed through resistance welding process in the middle. During the production process of welding wires, heating can affect their physical properties, leading to high temperature, pressure, and other conditions where the majority of welding joints are prone to breakage and other damages. It is necessary to strengthen inspection to ensure its safety and reliability.
2. Material properties
The surface of ordinary welded pipes has certain cracks and oxide layers, so polishing, anti-corrosion and other treatments are required to ensure quality. During use, due to physical limitations, ordinary welded pipes have limited bearing pressure and certain corrosion resistance, but their service life is usually shorter compared to seamless pipes.
3. Scope of use
Ordinary welded pipes are widely used in fields such as shipbuilding, hydraulic equipment, buildings, bridges, etc. They are mainly used in low temperature and low pressure situations. Long term use can easily lead to brittle fracture and other situations. Therefore, in some situations where high quality and relatively low safety are required, reinforcement and other treatment methods are needed to ensure safe use.
Summary:
Through the introduction and comparison of seamless pipes and ordinary welded pipes, we can find that the overall performance of seamless pipes is superior to ordinary welded pipes, with advantages such as better strength, stability, and high corrosion resistance. Therefore, they can be widely used in high-risk industries such as chemical engineering, petroleum, and natural gas, as important pipes with high strength and high corrosion resistance. Ordinary welded pipes are suitable for supplementing the basic requirements for pipes in certain situations, such as transmission and distribution pipelines, tap water pipes, water supply pipes, and other fields in certain non high-risk industries. Therefore, when selecting pipeline materials, it is necessary to consider their respective advantages and disadvantages based on specific needs and environment, and meet actual needs while ensuring safety.
