Oil spiral welded pipe does not belong to the general metallurgical products, but in the seamless pipe, bars or plates on the basis of after deep processing (pressure processing, welding, machining, heat treatment, surface treatment, etc.), actually belong to mechanical product areas. In order to meet the requirements. In addition to the stringent requirements of chemical composition, metallurgical quality, mechanical parts, residual stress and other manufactured goods outside diameter, inside diameter, wall thickness, roundness, straightness and thread parameters, sealing performance and structural integrity have root stringent requirements.
Characteristics of oil spiral welded pipe
Production of oil pipeline (excluding tube processing) and no difference in production of other spiral steel pipe. Today’s production of oil pipe widespread adoption of thermomechanical treatment, which is an important feature, but also improve the oil pipe mechanical properties is an important way. The so-called thermomechanical treatment is to make steel and alloy to be plastically deformed in the austenitic state, and then wait for the deformation of the austenite recrystallization occurs on quenching. For hot rolling oil pipe to control the deformation amount and the total of the final rolling temperature. The hot-rolled tubes given the temperature of the reducing mill generally that in the above 850 ℃ (steel structure is still in the austenitic state), if given the reduced diameter by a water quenching means on the real view of the spiral steel pipe after rolling rapid water quenching thermomechanical treatment process can be completed.
The oil spiral steel pipe ausforming surviving on some issues, such as spiral steel during quenching temperature uneven or uneven cooling tube will cause changes in the pipe cross-section on the process, the the bending direction along the length of the tube organizational performance inequality needs further research to solve.
Post time: Oct-25-2019