Different Mechanical Properties of Seamless Steel Pipe

Seamless steel pipe according to different cross-sectional shapes can be divided into tube and shaped tubes. Because in the perimeter of equal conditions, the largest area of a circle with a circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform. Thus, the vast majority of pipe is pipe. However, the tube also has some limitations. Under conditions such as by plane bending, tube as good as square, a large seamless steel pipe bending strength, the skeleton of some farm machinery, steel and wood furniture on the popular square, rectangular tube. Different seamless steel pipe according to mechanical properties.

Seamless hot-rolled coil as raw materials for cold rolling after pickling descaling, the finished product is rolling hard volumes, due to continuous cold work hardening caused by deformation of the strength of the rolling hard volumes, and increased hardness, toughness plastic index decreases. Accordingly stamping performance will deteriorate and can only be used for simple modification parts. Rolling hard volumes can be used as raw material for hot-dip galvanizing plant, because hot dip galvanizing line is provided with annealing line. Rolling hard volumes generally weighs 6 to 13.5 tons, coil inner diameter of 610mm. Usually cold rolling plate, coil should be evaluated by continuous annealing (CAPL unit) or batch annealing and rolling to eliminate work hardening stress, achieve appropriate standards for mechanical performance indicators.