I. Summary

The mill is intended for manufacturing of round pipe of Φ45mm-Φ114mm with thickness of 1.5mm–5.0mm 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}→→ Single-arbor un-coiler →→Strip-head Cutter and welder→→

Horizontal spiral accumulater →→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. Round Pipe diameter: Φ45–Φ114mm

Pipe Thickness: 1.5 – 5.0mm

2. Square & Rectangle Pipe: 40X40mm –90X90mm

Pipe Thickness: 1.5– 4.0mm

3. Pipe Length: 6.0m – 12.0m

4. Length Tolerance: 0-6mm

b) SteelTape Specification

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

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

Outer diameter: Φmax=1500mm

Strip steel width: 160mm-360mm

Strip steel thickness:1.5mm-5.0mm

The maximum weight: 5.0 tons

c) Electricity

1. Dynamic power: AC380V±10%, 3phases, 50Hz±1.0%

2. Control Power: AC220V±10%, one phase, 50 Hz ±1.0%

d) Electric installed capacity: appro.700KW

e) Cooling water

1. Reservoir for High Frequency equipment: 25m³, one set

2. Reservoir for circulating cooling water: 20m³, one set

f) Compressed air

1. Pressure: 0.4Mpa

2. Flow: 1.5m3/h

g) Production capacity

Annual output: 45,000 ton, according to the yearly working days、daily working hours and the products.

h) Line speed: 30-60m/min

i) Size of the whole line: 65X7m