I. Summary

The mill is intended for manufacturing round pipe of Φ32mm-Φ76mm with thickness of 1.5mm–4.0mm from cold-rolled and hot-rolled coil strip by means of unclosed tubular blank with its subsequent welding into tube, edge heating by means of solid state high-frequency welder, longitudinal seam welding in rolls of tube welding machine, cooling, further sizing or shaping and on-stream cutting of endless tube in measured lengths.

Finished product will be of round, square or rectangular pipe.

II. The technical flow of the production line

{SteelTape}→→ Double-head un-coiler →→Strip-head Cutter and welder→→

Cage Loop→→Forming section(Flattening unit +Main driving unit +Forming unit +Guide unit +High frequency induction welding unit +squeeze roller)+ De-burr frame →→Cooling unit →→ Sizing unit and straightener →→Flying saw under computer-control →→ Run-out table

III. Basic conditions:

a) Steel Pipe Specification

1. Pipe diameter:              32–76mm

Pipe Thickness:             1.5 – 4.0mm

2. Square Pipe:               25X25mm –60X60mm

Rectangle Pipe:             30X20mm –70X50mm

Pipe Thickness:             1.5 – 3.0mm

3. Pipe Length:                6.0m – 9.0m

4. Length Tolerance:           0-6mm

b) SteelTape Specification

1. Material:        Carbon steel (δb≤500Mpa, δs≤235Mpa)

2. Steel Tape: Inner diameter:      Φ470-510mm

Outer diameter:      Φmax=1500mm

Strip steel width:      100mm-240mm

Strip steel thickness:  1.5mm-4.0mm

The maximum weight: 3 tons

c) Electric installed capacity:     appro. 600KW

d) Size of the whole line:          appro. 60X7m

e) Line Speed:                    40-100/min