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The brittle fracture of the straight seam steel pipe processing

Oct 27, 2018

The brittle fracture of the straight seam steel pipe processing

Straight seam steel pipe fracture phenomenon studies is brittle fracture, and more with the use of component temperature. When the temperature below a certain temperature, the material will be transformed into brittle state, its shock absorption function declined obviously, this phenomenon is known as the cold short, high strength metal materials in low stress brittle fracture in the process, is far from homogeneous isotropic materials organization will have crack, there will be in the inclusions, porosity and other defects, these defects can be as the micro cracks in the material. So, when the design based on component of the operating temperature has the right to select the ductile-brittle transition temperature of the material.


Straight seam steel pipe of high frequency welding is using skin effect and proximity effect of alternating current (ac), steel (strip) after rolling forming, the formation of a cross section of broken circular tube billet, inside the tube billet near the center of induction coil rotating around one or a set of impedance (magnet) and impedance and pipe opening form a electromagnetic induction loop, under the action of skin effect and proximity effect, the pipe opening edges produce powerful and concentrated heat effect, make the weld edge rapidly heated to required after roller extrusion temperature, welding metal molten state to realize the joint between the crystal, after cooling to form a firm butt weld.


Because of the hot rolled straight seam steel pipe billet where defects such as cracks or high precision cold drawn pipe is made into oil cylinder, seamless steel pipe cold drawing. When fracture occur in use process, almost no plastic deformation occurs, generally are brittle fracture. Brittle fracture is caused by a variety of reasons such as: on the grain boundary precipitates, regardless of its strength than the matrix strength is strong or weak, all is the cause of the crack.

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