ERW Steel Pipe

　　 SSAW steel pipe often there will be some quality problems in the production and use, affecting normal use in some aspects, the need for spiral welded pipe to identify the quality, according to a certain way and performance testing, can produce significant in actual use role, then how to identify counterfeit spiral welded pipe method: the appearance often pockmarked face phenomenon. 　　Generally the whole proportionate amount would be better, mainly taking into account the cumulative error and probability theory this problem. Some of the above please add if inadequate, we welcome the discussion of knowledge about aspects of the steel pipe together, advances constantly exchange. Pock is due to badly worn groove spiral welded pipe surface irregularities caused by uneven defects. Because of shoddy spiral welded pipe manufacturers have to pursue profits, rolling groove most often exceeded. The surface is easy to produce scarring. 　　Quality spiral welded pipe of uniform composition. H...

　　 Spiral pipe factory should be done before the mechanical performance test and flattening test, and flaring test, and to achieve the standard requirements. Spiral steel pipe quality inspection method is as follows: 　　1, From the face of it, that is visual inspection. Visual inspection of welded joints is a simple procedure but widely used test method is an important part of product testing, the main defects and deviations are found on the surface of the weld size. Usually by the naked eye, with the standard model, gauge and test tools such as a magnifying glass. If the weld surface defects, weld defects there may be internal. 　　2, Physical test methods: physical test method is to use some physical phenomena assay or test method. Or within the workpiece material defect inspection, and are generally used NDT methods. NDT ultrasonic flaw detection, radiation detection, penetration testing, magnetic testing and so on. 　　3, Pressure vessels strength test: pressure vessels, in addit...

　　The casing pipe is a high-end product for steel pipe production. There are many types of casing, and there are a total of 15 types of casing diameter specifications. The outer diameter range is 114.3-508mm; the steel grade is divided into J55, K55, N80, L-80 , P-110, C-90, C-95, T-95 and other 11 kinds; casing pipe end buckle type and many types of requirements, can be processed button type STC, LC, BC, VAM and other buckle type. The casing pipe production and installation process involves a lot of tests, mainly the following: 　　 1, Ultrasonic testing 　　When the ultrasonic wave propagates in the material to be detected, the acoustic characteristics of the material and the changes in the internal structure have an influence on the propagation of the ultrasonic wave. Through the degree and condition of the ultrasonic wave to detect, to understand the change of the material properties and the structure. 　　 2. Ray detection 　　Radiographic examination uses the difference in the am...

　　The quality of tube billet is the main factor to judge the quality of seamless pipe. In order to ensure the reasonable progress of the perforating process and obtain high quality seamless steel tubes, it is necessary to make strict requirements for the geometrical size of the tube, the microstructure and the low magnification of the surface. 　　Seamless steel pipe 　　Too large diameter or too large oval shape will make the condition of perforation worse. At the same time, it will cause compression deformation due to the large diameter. 　　The key internal organizations are shrinkage and central porosity, non-metallic inclusions, and gas accumulation. The strictness of this requirement varies with the use of seamless steel tubes and steel grades. 　　The most important thing is the surface quality of the tube, because in the steel tube billet to any disabled city seamless tube product, often misplaced sites lead to stress concentration, plastic deformation will deepen and extend th...

　　LSAW pipe fracture, hydraulic (pneumatic) parts in mechanical performance design, brittle fracture is also related to the temperature of parts. 　　It is found that when the temperature is lower than a certain temperature, the data will change to brittle state and the impact absorption power will decrease obviously. This phenomenon is called low stress brittle fracture in this process. In cold brittle and high strength metal materials, there are cracks in non-uniform isotropic tissue in the data organization, as well as inclusions and pores. All these defects can be regarded as micro cracks in materials. Therefore, the design time should be selected according to the components of the working temperature to select the appropriate cold brittle transition temperature data. 　 　LSAW pipeline 　　It is generally considered that the data are homogeneous, continuous and isotropic. According to this analysis method, it is considered safety design, and sometimes it will crack unexpectedly. ...

　　OCTG is a kind of high-level product made of steel pipes. For OCTG’s diameter, there are 15 kinds. For OCTG’s steel grade, there are 11 kinds, such as J55, K55, etc. For it’s pipe end treatment, there are also many kinds, such as VAM, TOP VAM, LC, BC, STC, etc. As OCTG is quite a delicate steel pipe, so how much do you know about the testing method s of OCTG? Here we will introduce you some test methods of OCTG: 　 　1. Eddy Current Testing 　　Eddy current testing mainly uses the eddies in the work piece produced by magnet coils to analyze the internal qualities of the work pieces, and to detect the surface and near surface defects of various kinds of conductive materials. 　　 2. Ultrasonic Testing 　　When ultrasonic waves propagate in the tested material, acoustic characteristics of the material and changes of internal structures have a certain influence on the propagation of ultrasonic waves. We can know the changes of material's performance and structure by the influence de...

　　The heat treatment of 15CrMo seamless steel pipe is one of important process in manufacturing process. 　　Compared with other processes, the heat treatment generally does not change the shape and chemical compositions of 15CrMo seamless steel pipe. It changes the chemical composition of the surface of 15CrMo seamless steel pipe, to improve the performance of the workpiece. In order to make the 15CrMo seamless steel pipe has the required mechanical properties, physical properties and chemical properties, heat treatment is necessary besides selecting reasonable materials and a variety of forming process. 　　Steel is the most widely used material in the mechanical industry. In the 1960s, the heat treatment takes advantage of plasma field which make 15CrMo seamless steel pipe obtain new technology for surface heat treatment and chemical heat treatment. Heat treatment can control the microstructure of steel, therefore, heat treatment is important for 15CrMo seamless steel pipe. 　　 htt...