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219-406 ERW steel tube mill, diameter: 219mm-406mm, wall thickness:5mm-20mm, coil weight: 30 tons - details see: https://www.machineto.com/219-406-erw-steel-tube-mill-10081943

The Introduction of ERW mill:

The plate in certain width after slitting line and stripping is unfolded and leveled. Then, they are sent into forming machine. Used the roller, the plate is bent into pipe state. The edge of the steel plate is melted by making use of the proximity effect and skin effect of high frequency current. Then, the plate is extruded and welded into the pipe by extruding roller. Straight seam welded pipe mill also is called ERW mill.

The forming styles of straight seam welded pipe can be divided intoroll forming,cage forming, flexible forming (or F·F·X forming), full auto flexible forming(F·F·X forming).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.

According to the products functions, straight seam mills are divided into API model, national standard model.

API model mainly produces high level steel pipes, such as delivery pipe of petroleum and natural gas, oil well casing and so on. The requirements for material and quality are very strict. The mill is equipped with section equipment and technological equipment, such as IF annealing, air-cooled roll table, ultrasonic inspection, high pressure hydraulic pressure testing machine, drifter and so on.

National standard model mainly produces the steel pipe, such as water-gas pipe, structure pipe and so on.

Production process:

Loading coil-uncoiling-leveling –cutting and butt welding – looping and material storage – forming – high frequency welding – IF annealing- air cooling- water cooling-sizing- flying cut off- flat head chamfering-hydraulic testing-ultrasonic inspection-spraying – products connection

The bearing types of ERW mill:

No	Model	Specification	Speed(m/min)	Thickness(mm)	Coil weight(ton)	Capacity(kw)	Area(m2)
1	ZFJZ-100	Φ25~Φ114	30~60	3~8	15	~1100	18×200
2	ZFJZ 160	Φ60~Φ165	30~50	3~10	10	~1600	21×260
3	ZFJZ -200	Φ114~Φ219	20~40	4~14	15	~1800	21×260
4	ZFJZ -300	Φ165~Φ325	10~30	5~16	20	~3000	24×300
5	ZFJZ -350	Φ165~Φ355	8~25	5~16	20	~3500	24×300
6	ZFJZ -400	Φ219~Φ406	8~20	5~20	30	~4000	27×300
7	ZFJZ -500	Φ219~Φ508	8~20	5~20	30	~4500	27×300
8	ZFJZ -600	Φ219~Φ610	8~20	5~20	30	~5000	27×300