Common defects of seamless steel pipes can be divided into two categories: external surface defects and internal surface defects. 1. External surface defects (1) Folding defects are irregularly distributed. Macroscopic features: If there is mold residue left on the surface of the continuous casting billet, the outer surface of the rolled tube will have deep folds.There are stacking defects,…
Read MoreWhen the carbon seamless steel pipe is cold drawn, there are defects such as cracks in the hot rolled tube blank. For example, after the high-precision cold-drawn tube is made into an oil cylinder, the fracture that occurs during use has almost no plastic deformation, and is generally brittle fracture. Brittle fracture is caused by a variety of reasons….
Read MoreThe main reasons for the lack of hardness of seamless steel pipes (smls) are the following five points: 1. The heat treatment temperature is too high This is mainly caused by the poor temperature setting of the processing technology or the error of the temperature control system. The temperature of the processing technology should be adjusted, and the temperature…
Read More1. Large diameter thick wall seamless steel pipe is used for the manufacture of large shaft and roller assemblies, oil cylinder and hydraulic oil cylinder, mechanical spare parts, mechanical structure, large airports, bridges, wharfs and building structures 2. In our daily life, large-diameter seamless steel pipe is a very common channel, which is mainly used in sewers and water…
Read More1. The thickness of capillary wall shall be uniform and there shall be few internal and external surface defects; External surface polishing and internal hole defect cleaning equipment shall be equipped. 2. Compared with the ordinary cold drawn steel pipe, the cold drawn precision seamless pipe production increases the pickling and re inspection process of hot-rolled capillary, which is…
Read MoreThe biggest difference between seamless steel pipe and other long strips is that there is no joint around it, and the section of steel pipe is hollow. Due to different cross-sectional shapes, it is often classified as circular steel pipe and heterosexual steel pipe. Of course, circular steel pipe is more common in terms of actual use efficiency. Wonder…
Read MoreSeamless steel pipes are often used as raw materials for ring-shaped metal material parts, which not only saves a lot of complicated technological processes, but also greatly reduces the wear and tear of stainless steel plates in the production process and saves product costs. The basic principle of this kind of production and processing is not difficult to understand….
Read MoreThere are many kinds of quality inspection methods for large-diameter seamless pipes, and physical methods are also the most common inspection methods. Physical inspection is a method of using some physical changes to carry out measurement or inspection. The inspection of the internal defects of raw materials or large-diameter seamless steel pipes is generally carried out by non-destructive testing….
Read MoreXINYUE STEEL GROUP set up several production bases in Tianjin & Hebei Province, manufacturing ERW Steel Pipe, SSAW Steel Pipe, LSAW Steel Pipe, Seamless Steel Pipe, Scaffolding system and couplers, RHS, SHS, etc.
