The expanded connection is made of malleable cast iron or ductile iron as the main material, and consists of a lined pipe body (bushing), nuts or bolts, threaded rings or expanded pressure flanges, and sealing rubber rings. It adopts fastening nuts or pressure flanges. In this way, the pipe compresses the sealing ring, so that the inner surface of the pipe and the sealing ring on the lining pipe body are connected to the metal pipe fittings to form a diagonal sealing connection.

This article introduces the four major factors that affect the service life of stainless steel seamless steel pipes, and how to select high-quality stainless steel seamless pipes.

Solution treatment refers to a heat treatment process in which the alloy is heated to a high temperature and maintained at a constant temperature in the single-phase region, so that the excess phase is fully dissolved into the solid solution and then rapidly cooled to obtain a supersaturated solid solution.

Three defects will occur during the welding process of austenitic stainless steel seamless pipes, and different measures should be taken according to the actual situation.

Carbon steel seamless pipe is a seamless pipe made of carbon steel. Carbon steel refers to iron-carbon alloy steel with a carbon content of less than 2% (including 2%). Carbon steel can be further divided into low carbon steel, medium carbon steel and high carbon steel, mainly depending on the carbon content in the steel.

X-ray inspection refers to the use of X-rays to penetrate metal materials, and due to the different absorption and scattering effects of the material on the rays, the film sensitivity is different, resulting in the formation of different blackness images on the negative film. Based on this, it is a testing method to determine the internal defects of the material.