Thick-walled
ssaw steel pipe production control first is to improve the toughness of plastic pipe, improve the cleanliness of molten steel and reduce harmful inclusions, improve the overall quality of steel pipe. Use in the production process and reasonable cooling system to prevent internal cracks, in many ways starting to improve the quality of steel pipe.
SSAW steel pipe in the production process reasonable control of the heating temperature by measuring the thermoplastic curve, select the optimal heating temperature. Note also that there is enough heating tube holding time, in order to reduce deformation resistance and improve the structure of the thick spiral plastic toughness.
Program spiral pipe production process requires more, the final step is to reduce the roll speed, roll speed is a key parameter piercing process, the roll speed from low to process high variability, there is a start delamination critical roll speed. Lower roll speed, easy to form a tube bore; higher roll speed, tube and spiral steel structure is easy to form a layered defects. In order to eliminate the structural tube and spiral steel lamination defects, should reduce the roll speed to the start of the critical delamination roll speed or less.
