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Short joint welding of oil casing
The oil casing is short joint, causing this phenomenon due to internal mechanical failures such as roller or shaft eccentricity, or excessive welding power, or other reasons. As the welding speed increases, the tube blank extrusion speed increases. This facilitates the extrusion of the liquid met...Read more -
Steel pipe dimensions & sizes chart
Steel Pipe Dimension 3 Characters: A completely description for steel pipe dimension includes outer diameter (OD), wall thickness (WT), pipe length (Normally 20 ft 6 meter, or 40 ft 12 meters). Through these characters we could calculate the pipe weight, how much pressure pipe could bear, and the...Read more -
Technical problems of heat treatment of welding seam of welded pipe
The welding process of high-frequency welded steel pipe (erw) is carried out under the condition of fast heating rate and high cooling rate. The rapid temperature change causes a certain welding stress, and the structure of the weld also changes. The structure in the welding center area along the...Read more -
The importance of non-destructive testing of seamless pipes
In the production process of seamless steel pipes, flaw detection of seamless steel pipes plays an important role, not only to detect whether the seamless steel pipes have quality defects, but also to test the appearance, size and material of the steel pipes. By applying a single non-destructive ...Read more -
Quenching and tempering treatment of seamless steel pipe
After the quenching and tempering treatment of seamless pipes, the parts produced have good comprehensive mechanical properties and are widely used in various important structural parts, especially those connecting rods, bolts, gears and shafts that work under alternating loads. But the surface h...Read more -
What are the common uses of seamless steel tubes?
The seamless tube is formed in one piece, directly pierced from round steel, without welds on the surface, and has a wide range of applications. Because of the special processing of seamless steel tubes, carbon structural steel, low alloy structural steel, etc. are generally used for production, ...Read more -
Casing & tubing pressure rating
Casing pressure rating Out diameter mm Inner diameter mm Internal pressure strength Mpa External collapse strength Mpa Internal volume L/m 73.03 62.0 72.9 76.9 3.02 88.9 76.0 70.1 72.6 4.54 Tubing pressure rating Out diameter mm Inner diameter mm Internal pressure ...Read more -
Application of seamless steel pipe in construction industry
Among the many pipeline materials, the most practical one is seamless pipe (SMLS), which is a relatively powerful pipeline material, not only because of the wide range of application fields and scope of this pipeline material, but more importantly, Because the quality of seamless steel pipe is ve...Read more -
Resistance welding method
There are many types of electric resistance welding(erw), and there are three types of welding, seam welding, butt welding and projection welding. First, spot welding Spot welding is a method of electric resistance welding in which a weldment is assembled into a lap joint and pressed between two ...Read more -
Quality inspection method of spiral pipe
The quality inspection method of spiral pipe (ssaw) is as follows: 1. Judging from the surface, that is, in visual inspection. Visual inspection of welded joints is a simple procedure with various inspection methods and is an important part of finished product inspection, mainly to find welding...Read more -
Seamless tube eddy current flaw detection
Eddy current flaw detection is a flaw detection method that uses the principle of electromagnetic induction to detect surface defects of components and metal materials. The detection method is the detection coil and its classification and the structure of the detection coil. The advantages...Read more -
Corrosion in drilling pipe
What is the main difference between corrosion fatigue fracture and stress corrosion fracture of drill pipe? I. Crack initiation and expansion: Stress corrosion cracks and corrosion fatigue cracks are all sent to the surface of the material. Under strong corrosive media and large stress conditions...Read more