
Tube is formed in round shape passing through a set of driven and idler rollers of forming section before welding. In welding section tube id longitudinally welded by using high frequency induction welding method. Outside bead is removed and formed in shape of scrap. The weld seam is ironed and tube passes though the cooling section. In sizing section, tube is formed to specified size and converted into specified shape. After sizing, tube is cut to specified size and converted into specified sh
The proposed tube mill is a combination of equipment installed in a line for the production of High Frequency Induction Welded (HFIW) carbon steel tubes. The process involved is cold forming of carbon steel strip in circular shapes, longitudinal welding, sizing, converting into specified shape and cutting to pre determined length.
The complete line is divided in three sections:
▪ Entry Section
▪ Forming, welding, Cooling and sizing Section
▪ Cutting and Delivery Section
Raw material (Steel Strip) in form of a coil is uncoiled and fed into forming section passing through the equipment of entry section. Entry section enables the tube mill to run continuously by using strip joining and accumulation equipment. Tube is formed in round shape passing through a set of driven and idler rollers of forming section before welding. In welding section tube id longitudinally welded by using high frequency induction welding method. Outside bead is removed and formed in shape of scrap. The weld seam is ironed and tube passes though the cooling section. In sizing section, tube is formed to specified size and converted into specified shape. After sizing, tube is cut to specified size and converted into specified shape. After sizing, tube is cut to specified length by using flying cutting equipment and delivered in collecting though passing through run out conveyor.

1. BASIC DESIGN DATA
Design of the proposed line is based on following specification:
▪ Raw Material Specification
Raw Material Feeding | CR bright tube with oiled, Galvanized steel, HR coil |
Material Tensile Strength | Max 517MPa (75,000 psi max) |
Material Yield Strength | Max 460MPa (67,000 psi max) |
Coil OD | 1200mm to 2000mm |
Coil ID | 508mm&610mm (customer order) |
Coil Weight | Max 7000 kg |
Strip Width | Min 240mm, Max520mm |
Strip Thickness | Min2.0mm Max6.35mm |
▪ Production Range
Type of production | ▪Round Tubes ▪Square and Rectangular Hollow Sections |
Round Tube OD | Min 76mm, Max 165mm |
Round Tube Thickness | Min 2.0mm, Max 6.35mm |
Square Hollow Section | Min 60x60mm, Max 130x130mm |
Rectangular Hollow Section | Min 80x40mm, Max 100X160mm |
Square and rectangle Tube Thickness | Min2.0mm, Max 5.0mm |
Tube Cut Length | Min 6 meter, Max 12 meter |

▪ Line Specification
Line speed | Max 50m/min Min 10m/min |
Direction of Operation (To be confirmed by buyer) | Left → Right or Right → Left |
Welding Method | High Frequency Induction Welding |
Total Electric installed capacity | 1400kw |
Line area | Approx. 70x8.0 meter (length x width) |



Forming Section
轴材质Shaft material: | 40Cr, HF tempering quenching |
减速箱齿轮Material of bevel gear: | 20CrMnTi |
水平辊架Driven stand | 7 sets |
立辊架Idle stand | 8 sets |
减速箱Gear box | 7 sets |
Sizing Section
轴材质Shaft material: | 40Cr,HF tempering quenching |
减速箱齿轮Material of bevel gear: | 20CrMnTi |
水平辊架Driven stand | 5 sets |
立辊架Idle stand | 5 sets |
减速箱Gear box | 5 sets |

Our Machine produce:
a. Round pipe
b. Square and rectangle pipe
c. API standard casing and tubing
d. Solar field pipe
e. Cold forming C,Z,L,U




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