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Handu steel, Manufacturing process of cold drawn tube

Receiving raw materials (MOTHER TUBE)
POSCO or Hyundai Steel coil is being used to make the MOTHER TUBE from the JINJU 1st Plant of Handu Steel to ERW.

POINTING
Several sizes of the ends of the tube (mother tube) are reduced in size by swaging
(This operation allows the tube to be inserted into the dies)

HEAT TREATMENT
To match the hardness and modify the microstructure of customer needs.

SURFACE TREATMENT
Clean pipes through the process of flushing, acid and film.
In addition, DRAWING OIL is applied to facilitate COLD DRAWING.

DRAWING
At room temperature (COLD DRAWN). DRAWING MACHINE pulls the TUBE out of the plug and the die. This produces precise size tubes.

STRAIGTENING
This process make the tubes straighter (straightness)

CUTTING
Use the saw to cut the pipe to the size desired by the customer.

E.C.T
You can find even small defects by using EDDY CURRENT TEST. Use this equipment to examine the best quality products.

Finally, the quality team check the tubes and ship to customers.

Heart of Handu steel, introduce the manufacturing process of cold drawn tube

Heat treatment

Heat treatment