1
1~2Stage
1~2Stage
2
3~4Stage
3~4Stage
3
5~6Stage
5~6Stage
4
7~8Stage
7~8Stage
5
9~10Stage
9~10Stage
6
11~12Stage
11~12Stage
7
13~14Stage
13~14Stage
1
1~2Stage
1~2Stage
Step1: PRE-BENDING
Edge Bending and Press Bending that is applied for the products with thickness greater than 40T Performed before the processing
Step2: PRESS-BENDING
Carry out bending in the shape of J, C, O, using 7000 ton press2
3~4Stage
3~4Stage
Step3: POST-BENDING
Edge Bending and Press Bending that is applied for the products with thickness less than, and equal to 40T Performed before the processing
Step4: TACK WELDING
Tack welding process for regular welding after the completion of forming (Bending)3
5~6Stage
5~6Stage
Step5: EXTERNAL WELDING
Exterior welding process of PAW and/or GTAW after the completion of tack welding
Step6: LONGITUDINAL SEAM MILING
In case of edge forming Y-model, groove manufacturing process for exterior welding4
7~8Stage
7~8Stage
Step7: INTERNAL WELDING
GTAW internal welding process after the completion of external welding
Step8: RADIOGRAPHIC TEST
Automatic controlled RT system for checking the welding zone integrity5
9~10Stage
9~10Stage
Step9: HEAT TREATMENT
Batch type heat treatment process for solution treatment of STS pipe
Step10: SIZING
Sizing operation to guarantee the roundness and straightness of the product size6
11~12Stage
11~12Stage
Step11: END FACING
Process of bevel manufacturing both tips of tubes according to the product standard for field connection welding
Step12: PICKING
Cleaning the product surface and passivation treatment process using acid solution7
13~14Stage
13~14Stage
Step13: HYDROSTATIC TEST
Test processing of water pressure for line pipe and steel pipes used in plumbing