Square and rectangular pipe mill

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HG168 pipe mill is used to produce round pipe 2" - 6" and square tube 50x50mm - 130x130mm.

HG168 Pipe mill, round , square/rectangular steel pipe mill line

I. Summary

The mill is intended for manufacturing round pipe of Φ60mm-Φ165mm with thickness of 2.0mm–6.0mm 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



Round Pipe

Φ60 –Φ165mm

pipe thickness

2.0 – 6.0mm

Square & Rectangle Pipe

50X50mm –130X130mm

Pipe Length

6.0m – 12.0m

Length Tolerance


b) SteelTape Specification

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

2. Steel Tape: Inner diameter:    Φ600-Φ760mm

Outer diameter:    Max.Φ1800mm

Strip steel width:       200mm-520mm

Strip steel thickness:   2.0mm-6.0mm

The maximum weight:  6.0 tons

c) Electric installed capacity:      appro. 800KW

d) Size of the whole line:           appro. 90X7.0m

e) Line Speed:                    20-60m/min

Forming & sizing section

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:            7 sets (Horizontal)

-        Driven stand shaft:             Φ 120mm

-      Material of shaft:         40Cr

-         Side roll stand:                 8 sets(Vertical)

-         Side roll stand shaft:       Φ75mm

-      Material of shaft:          40Cr

-         Gear box & universal joint: 7sets

-      Material of gear box:      cast steel

-      Material of gear:          20CrMnTi

-      Main motor:              110kW   Model: Z4-250-11  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:               5 sets (Horizontal)

-         Driven stand shaft:              Φ 120mm

-      Material of shaft:          40Cr

-      Material of gear box:       cast steel

-      Material of gear:           20CrMnTi

-      Main motor:               160kW   Model: Z4-250-42  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.

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