I. Summary

The mill is intended for manufacturing round pipe of Φ114mm-Φ325mm with thickness of 3.6mm–12.7mm 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 pipe, square and rectangle pipe.

II. The technical flow of the production line

{SteelTape}→→ Double-head un-coiler→→Five-roll Flattener →→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 →→seam annealer→→

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:        Φ114mm-Φ325mm

Pipe Thickness:              3.6– 12.7mm

2. Square and rectangle pipe:    70x70-170X170mm

Pipe Thickness:                3.0 – 11.0mm

3. Pipe Length:                 6.0m – 12.0m

4. Length Tolerance:            0-6mm

b) SteelTape Specification

1. Material:      Carbon steel (δb≤758Mpa, δs≤496Mpa)

2. Steel Tape: Inner diameter:    Φ710-810mm

Outer diameter:       Φmax=2200mm

Strip steel width:      350mm-1020mm

Strip steel thickness:   3.6mm-12.7mm

The maximum weight:  30.0 tons

c) Electric installed capacity:      appro. 2500KW

d) Size of the whole line:           appro. 340X24m

e) Line Speed:                    10-50m/min

Main electric machine (15sets):

Forming:    37KW   Model: Z4-200-11   2 sets

45KW   Model: Z4-200-31   3 sets

75KW   Model: Z4-225-31   3 sets

Sizing:      75KW   Model: Z4-225-31   6 sets

Drawing:    37KW   Model: Z4-200-11   1 sets

Main Reducers: 15 sets (ZLY280)