Straight Seam HF Welded Pipe Mill

Description
The steel plates in certain width after slitting and stripping are unfolded and leveled and then sent into a forming machine. By using the roller, the steel pipe is processed into pipe state. The edge of the steel plate is melted by the proximity effect and skin effect of high frequency current. Then the plate is extruded and welded into pipes by using extruding roller. High frequency straight seam welded pipe mill is also called ERW (electric resistance welding) pipe mill.

Application
1. High frequency straight seam welded pipe mill is suitable for all kinds of round pipe, square pipe and rectangular pipe.
2. According to the product functions, welded pipe making machine is divided into API model and national standard model. API model mainly produces high level steel pipes such as delivery pipe of petroleum, natural gas and oil well casing. National standard model mainly produces the steel pipe, such as watergas pipe and structure pipe.

Advantages
1. In the preparation process, high frequency straight seam welded pipe mill mainly developed the volume type loop hoppers.
2. In the aspect of forming unit, this welded pipe making machine developed double wire forming.
3. The structure of forming unit developed part of the vertical roll group, the small row roller straight shape and vertical roll shape.
4. In the operating line, high frequency straight seam welded pipe mill set up online continuous flow inspection and ultrasonic inspection.
5. In the steel tube heat treatment technology, it developed online welded heat treatment, offline frequency induction heat treatment and continuous bright annealing heat treatment.

Classification
1. The forming styles of high frequency straight seam welded pipe mill can be divided into roll forming, cage forming, flexible forming (or F•F•X forming) and full auto flexible forming (F•F•X forming).
2. The mill developed in our company adopts roll forming when having small diameter (Φ ≤ 114). The cage forming is adopted when having small DC thin wall (Φ ≤ 165, δ ≤ 6). Flexible forming is adopted when having middle diameter (Φ ≤ 340). Full auto flexible forming is adopted when having large diameter.
3. According to the products functions, high frequency straight seam welded pipe making machines can be divided into API model and national standard model.

Production Process
Loading Coil → Uncoiling → Leveling → Cutting and Steel Welding → Accumulator and Material Storage → Forming → High Frequency Welding → Water Cooling → Online Ultrasonic Inspection → Intermediate Annealing → Air Cooling → Water Cooling → Sizing → Flying Saw Sizing Cut Off → Pipe End Facing and Beveling → Hydraulic Testing → OffLine Ultrasonic Seam Inspection → OffLine Ultrasonic Tube Inspection → Weighing and Measure Length Spraying → Finished Products Connection

Main Projects and Clients on ERW Pipe Mill

No.	Equipment	Clients	Remark
1	114 Straight seam welded pipe mill	Lin Enterprises in Indonesia	Export Project
2	114 Straight seam welded pipe mill (straight edge cage forming)	Tangshan Jianlong Jianzhou Steel Co., Ltd (China)
3	114 Straight seam welded pipe mill	Steel Holding Co., Ltd in Kuming (China)	X60
4	168 Straight seam welded pipe mill (straight edge cage forming)	Thailand Puyi Industrial Company	Export Project
5	180 Straight seam welded pipe mill (straight edge cage forming)	Guangdong Shun’anda Peaceful Container Co., Ltd
6	168*10 Straight seam welded pipe mill (F.F forming)	Wuxi Yulong Precision Steel Pipe Co., Ltd (China)	API5L
7	140340 Straight seam welded pipe mill (F.F forming)	Tianjin Shenzhoutong Steel Pipe Company	J55 X65
8	140355 Straight seam welded pipe mill (F.F forming)	Tianjin Lianzong Steel Pipe Co., Ltd	API5CT
9	426 Straight seam welded pipe mill (F.F forming)	Haicheng Northern Steel Pipe  Anticorrosion  Co., Ltd (China)	J55 X65
10	219 *14 Thick wall straight seam welded pipe mill (F.F forming)	Tianjin Youfa Steel Pipe Co., Ltd	API
11	508 × 14 (400 × 400) Straight seam welded pipe mill	Korean General Steel Pipe Co., Ltd	Export Project
12	530 × 16 Full automatic flexible forming ERW mill	Russian Guotong Steel Pipe Co., Ltd	Export Project
13	711 Full automatic flexible forming ERW mill	Anshan Hongxiang Steel Pipe Co., Ltd	API5 L

Parameters of High Frequency Straight Seam Welded Pipe Mill

No.	Model	Specification	Speed (m/min)	Thickness (mm)	Coil Weight (ton)	Capacity (kW)	Machinery Floor Area (m2)
1	ZFJZ100	Φ42 Φ114	3060	38	15	1100	2 × 18 × 200
2	ZFJZ 160	Φ60 Φ165	3055	310	10	1600	2 × 21 × 260
3	ZFJZ200	Φ11 Φ219	2045	414	15	1800	2 × 21 × 260
4	ZFJZ300	Φ16 Φ325	1040	516	20	3000	2 × 24 × 300
5	ZFJZ350	Φ16 Φ355	835	516	20	3500	2 × 24 × 300
6	ZFJZ400	Φ21 Φ406	830	520	30	5000	2 × 24 × 400
7	ZFJZ500	Φ21 Φ508	825	520	30	7000	2 × 30 × 400
8	ZFJZ600	Φ21 Φ610	820	522	40	9000	2 × 30 × 400
9	ZFJZ700	Φ27 Φ711	820	525	40	10000	2 × 30 × 400