91国产精品

Pipe internal cracks solutions are as follows:

(1) Requires strict control of steel pipe superheat control package, reducing Shandong seamless steel slab inside the tiny crater formed columnar crystals or reduce the level of development.

(2) Carried out in strict accordance with the standard package deceleration, according to standards tailing action to guarantee internal quality Shandong seamless steel billet tail.

(3) To replace the mold foot roller and an arcuate segment of the arc test, not the timing of Shandong seamless steel mold and foot roller arc cases examined.

(4) Two cold water pipe carefully check, roller situation stop pouring water every time, it does not satisfy the requirements of production allowed.

(5) Steel casting master station to keep abreast of current fluctuations of electromagnetic stirring, current fluctuations if electromagnetic stirring is greater than卤10A, to record good flow number, start and end time, or on a vote of no electromagnetic stirring currents below 400A standard the length of the cut waste.

(6) Machine found mold polarization, notify maintenance personnel polarization amplitude measurement mold, timely adjustment.

(7) Constant pulling speed casting.