Type of Spiral Pipe Fracture

Spiral welded steel pipe for liquid delivery with: water supply, drainage. For gas transportation with: gas, steam, liquefied petroleum gas. Petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction, is the development of China's 20 key products (such as water supply, water supply, water supply and drainage).There are several types of fracture of the spiral tube, according to the situation after the destruction of materials corrosion coating steel pipeand metal material fracture is roughly the same type is divided into three types, namely: ` cleavage fracture, a hole reverse fracture, b slip surface Separation fracture.Cleavage fracture of the cross-section of a crystal in strict accordance with the separation, the crystal surface known as the cleavage plane. The fracture strength along this plane is the lowest, and is determined by equation (1-4). The factors that determine the cleavage plane are the specific surface energy y, the interplanar distance of the crystal plane, and the elastic modulus along the normal direction. Cleavage fracture is almost not accompanied by plastic deformation, is a brittle fracture, in the body-centered cubic, closely packed hexagonal gold center. Face-centered cubic metals generally do not undergo cleavage fracture. The shear fracture is the main fracture mechanism of the ductile material. Such as anti-corrosion steel alloy in the second phase of the particles from the role of blocking the slip, increasing resistance to plastic deformation; when the plastic deformation increases, the second phase particles and substrate interface occurs stripping Ang, a small hole; Forming, growing up and merging will form a shear section. For high-purity metal, the absence of second-phase particles, bimetallic wear-resistant composite pipe and therefore will not produce: tiny holes, the result of moving along only the surface area is increasing, and finally form a sliding surface separation section. Anti-corrosion coating steel pipe spinning compound technology is precisely under the special control of special equipment, the pressure roller rotation and lined tube friction to produce heat, quickly reach the softening point of stainless steel, squeezing the outer extrusion tube to the elastic deformation, the two produce interference Cooperation, to achieve close integration. From the perspective of the organization of the gold, the fracture is divided into transgranular fracture and fracture along the goods.