I. Summary OF HG273 ERW API WELDED PIPE PRODUCTION LINE

The API TUBE mill is intended for manufacturing of round pipe of Φ89mm-Φ273mm with thickness of 4.0mm–12.0mm 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 pipe, square and rectangle pipe.

II. The technical flow of the production line OF HG273 ERW API WELDED PIPE 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 OF HG273 ERW API WELDED PIPE PRODUCTION LINE:

a) Steel Pipe Specification OF HG273 ERW API WELDED PIPE PRODUCTION LINE

1. Round Pipe diameter: Φ89mm-Φ273mm

Pipe Thickness: 4.0– 12.0mm

2. Square and rectangle pipe: 70x70-200X200mm

Pipe Thickness: 4.0 – 12.0mm

3. Pipe Length: 6.0m – 12.0m

4. Length Tolerance: 0-6mm

b) SteelTape Specification OF API TUBE MILL LINE

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

2. Steel Tape: Inner diameter: Φ600-800mm

Outer diameter: Φmax=1800mm

Strip steel width: 280mm-860mm

Strip steel thickness: 4.0mm-12.0mm

The maximum weight: 15.0 tons

c) Electric installed capacity: appro. 1800KW

d) Size of the whole line: appro. 130X16m

e) Line Speed: 10-40m/min

Forming & sizing section OF API TUBE MILL LINE

5.1 Forming mill gearbox, universal joint

5.1.1 Mill entry flattener by up-horizontal roll and below-horizontal roll, one positive five-roll flattener, one pair of feeding vertical roll.

5.1.2 Forming mill consists of:

- Driven stand: 12 sets (Horizontal)

- Driven stand shaft: Φ 180mm

- Material of shaft: 42CrMo

- Side roll stand: 9 sets(Vertical)

- Side roll stand shaft: Φ120mm

- Material of shaft: 40Cr

- Gear box & universal joint: 12 sets

- Material of gear box: cast steel

- Material of gear: 20CrMnTi

- Main motor: 185kW 2 sets

- Main redactor: 2 sets

- Horizontal roller frame with worm gear & shaft. adjust up and down at same time and level.

5.2 Sizing mill gear box, universal joint

5.2.1 Sizing mill consist of:

- Driven stand: 6 sets (Horizontal)

- Driven stand shaft: Φ 180mm

- Material of shaft: 42CrMo

- Side roll stand: 6 sets (Vertical)

- Side roll stand shaft: Φ 120mm

- Material of shaft: 40Cr

- Gear box & universal joint: 6 sets

- Material of gear box: cast steel

- Material of gear: 20CrMnTi

- Main motor: 200kW Model: Z4-280-21 1 set

- Main redactor: 1 set

- 2 sets single head Turkshead, with 4 rollers*2sets

- One speed testing roller with air cylinder for CNC flying saw

- Horizontal roller frame with worm gear & shaft. adjust up and down at same time and level.