From smelting to rolling, pipe processing and heat treatment of seamless steel pipes, the chemical composition, metallography, mechanics, and metal physical properties must meet the requirements for use.
The performance of seamless steel pipes can be divided into two categories:
Performance: including mechanical properties, physical properties, chemical properties
Process performance: including casting performance, pressure processing performance, welding performance, cutting performance, heat treatment performance.
Simply put, the mechanical properties of seamless steel pipes are the ability of seamless steel pipes to resist external forces. The external force acting on the metal material. According to the nature of the load, it can be divided into static load, impact load and alternating load. Commonly used mechanical performance indicators are: strength, plasticity, hardness, impact toughness, fatigue strength, etc.
The strength of seamless steel pipe refers to the ability of metal materials to resist deformation and fracture under static load. Since the load acts in the form of tension, compression, bending, shearing, etc., the strength is also divided into tensile strength, compressive strength, bending strength, and shear strength. The strength of steel pipes can generally be measured by metal tensile tests
The so-called plasticity refers to the ability of seamless steel pipes to produce permanent deformation without damage under static load. The plasticity index of metal is also measured by tensile test. Two indicators that mark the quality of metal plasticity are elongation and reduction of area.
Hardness is a measure of the hardness of seamless steel pipe. Usually refers to the ability of seamless steel pipe to resist harder objects pressed into its surface, and it can also be said to be the ability of seamless steel pipe material to resist deformation. Hardness is the property of a solid, which is manifested in different measurement methods and measurement conditions. It is also manifested in the ability of a solid to resist elastic deformation, plastic deformation or cracking, or resistance to two or three of them simultaneously ability.
The impact test is very sensitive to the defects of seamless steel pipes. Impact test is a traditional conventional mechanical test method. Because the sample is easy to process, the test time is short, and it is easy to distinguish whether the selection of materials and heat treatment process is reasonable, it has been widely adopted by the engineering community.
Tips: astm a53 grade b is more popular than other grades. These pipes can be bare pipes without any coating, or it may be Hot-Dipped or Zinc-Coated and manufactured by Welding or by a Seamless manufacturing process. In Oil and Gas, A53 grade pipes are used in the structural and non-critical applications.
The difference between different specifications of straight seam steel pipe
There are many types of steel pipes, which can be divided into straight seam steel pipes and spiral steel pipes according to the welding method. Because the two steel pipes have different welding methods, the performance is also different.
Three production processes of welded pipe
This time we mainly introduce welded steel pipe, that is, welded steel pipe. Its production is to bend the tube blank (steel plate and steel strip) into the required cross-section shape and size tube by various forming methods, and then weld the weld by different welding methods to get the steel pipe.
The influence of welded pipe blank width consumption
Welded pipe blank is the raw material for manufacturing welded pipe. Its mechanical properties and chemical composition have a far-reaching impact on the quality of welded pipe. Its width is an important factor to determine the weld strength. We usually say that the appropriate width of welded pipe blank refers to the width of a given thickness. The determination of the width is restricted by many factors.
