duplex stainless steel pipe grades

Duplex steel pipe is a kind of low-alloy structural steel pipe, which has good mechanical properties, good corrosion resistance, easy processing, strong heat resistance and impact resistance, and is widely used in modern industrial and civil buildings. Duplex steel pipes are divided into various types according to factors such as application occasions, heat treatment process, material, external dimensions and surface requirements.

●  grade of hot-rolled duplex steel pipe
According to the hot rolling process, the hot-rolled dual-phase steel pipes are divided into hot-rolled dual-phase structural steel pipes and hot-rolled dual-phase low-alloy structural steel pipes. According to different materials, the duplex structure steel pipes can be subdivided into Q235, Q235B, Q345, Q345B, Q420 and other grades; the duplex low alloy structure steel pipes can be subdivided into 20Cr, 30Cr, 35Cr, 45Cr and other grades. The above grades can be heat treated according to the requirements of the application to change the heat treatment state of T, Y, T+Y, N, etc., so as to meet the various needs of users.
●  grade of welded duplex steel pipe
The types of welded duplex steel pipes mainly include Q235, Q235B, Q345, Q345B, Q420 and other grades, among which the Q345B type steel pipe is the most commonly used, with good welding performance and high strength, which can meet various requirements of customers and has good corrosion resistance , easy to process, strong heat resistance and impact resistance, widely used in modern industrial and civil buildings.
●  grade of seamless duplex steel pipe
The types of seamless duplex steel pipes mainly include 20Cr, 30Cr, 35Cr, 45Cr, etc. Among them, the 45Cr type steel pipe has strong impact resistance and good heat resistance, which can meet the user's requirements for impact performance and use under strict environmental conditions. need. In addition, this type of seamless duplex steel pipe is generally processed by cold drawing, which has high strength and excellent corrosion resistance, and can meet the high requirements of the use environment.
The above is the introduction of the grades of duplex steel pipes. There are various types of duplex steel pipes, and their uses are also different, and the scope of application is also very wide. In addition, duplex steel pipes also have many special requirements in the production process, such as surface treatment requirements, welding process and quality control requirements, as well as heat treatment requirements, etc., are very important. Therefore, the above types of duplex steel pipes are in During the purchase and use process, we must strictly follow the prescribed standards and procedures to ensure safe use and reliable quality.