Spiral steel pipe according to the situation after the destruction of the material, breaking roughly divided into three types, namely: cleavage fracture, tie troglobites anti-fracture, slip surface separation fracture.

 Cleavage fracture along a section strictly crystal – product surface separating the planes called cleavage plane. When the fracture along the crystal plane, the theoretical minimum breaking strength, cleavage fracture with almost no plastic deformation, is a brittle fracture occurs in the body-centered cubic, hexagonal close-packed gold center. Fcc metals is generally not cleavage fracture occurs. The nature of the genus L ductile material gold sessions, shear fracture is the main fracture mechanism. For high-purity metals, for there is no second phase particles, double metal wear-resistant composite pipe and therefore will not produce tiny holes. Results only battle along shifting surface area was increasing, and finally the formation of slip planes separate section. Anti-corrosion steel composite spinning technology under special equipment for precise control, re-pressed wheel rotation and liner friction generates heat quickly reach the softening point of stainless steel, roller squeeze out of the outer tube is elastically deformed, the two create an interference together to achieve closely. From gold session histological point of view, it is divided into the fracture and transgranular fracture along the fracture goods.

 The above-mentioned three kinds of anti-corrosion steel pipe fracture mechanism are likely to occur. For the actual destruction of the material, depending on the material or external conditions, all three in one fracture mechanism will play a leading role, but – under normal circumstances, should they exist simultaneously.