manufacturing technology of big diameter submerged arc welding steel pipe

Mouth straight seamsubmerged arc welding steel pipe mainly take sea and land oil and gas, oil and natural gas, coal and ore oar medium pipeline, especially for our country is currently in the construction of the "west to east gas pipeline project", can also be used for exports and replace imported.

German SMSMEER (who is the famous mannesmann), Japan NKK company, Japan O.T.K (Osaka special steel pipe), India WELSPVN pipe company, South Korea's hyundai heavy industries, and the company, has its unique pipe technology, tube for the pharmaceutical industry's elite.

Pharmaceutical tube technology method and characteristics of foreign production big straight seam submerged arc welding steel pipe forming method has: method of UOE, CFE row roll forming, RBE roller bend forming, JCOE forming method, C forming method and PFP gradual bending forming method, etc. Brief introduction is as follows:

1. The UOE method, first of all, on the edge of the bending plate inside U press forming mold pressed into U, and then in O press forming die pressure into type O welding into tube after the whole hole enlargement. UOE method is one of the most advanced forming method in the world, and by far the world has nearly 30 sets of welded pipe unit, the forming method of UOE is famous for its high production efficiency and product quality is good, but not for expensive, investment scale.

2. The CFE method of roll forming machine by the preform frame edge, flat roller frame, small bending roll and roller frame, because of the small set up many of the same row roller, makes the trajectory is almost on the edge of the steel plate forming process is a straight line, to avoid the phenomenon of edge stretching. CFE method forming quality is good, its product quality and no more UOF method. The use of raw materials for hot rolled strip coil, it is different from other forming are. It is mainly suitable for large quantity, a single variety steel pipe production, but it is difficult to produce high strength thick wall steel pipe and large diameter steel pipe.

3. Will RBE roller bend forming plate between three or four roll roll in the multiple rolling, this kind of method to produce welded pipe on the use of performance and reliability are close to the UOE welded pipe. RBE method of less investment, fast, moderate yield and greater flexibility, strong adaptability to the market, in recent years, this method have been applied in some developing countries. But because of lack of support the central forming method on forming roller, restricted by its stiffness, forming steel pipe diameter should not less than 508 mm (20) in, reduce the market share, China pipeline under 508 mm in diameter.

4. JCOE forming, first in terms of hydraulic press pressed steel plate shape into J, on both sides of the blank holder, the stamping for C shape many times, finally the half O shape mold pressed into type O. JCOE method of its product quality and the UOE welded pipe, and the line price is far lower than that of UOE unit, but its production efficiency is low.

5. C forming forming machine instead of UOE unit with two C and O U press press, in its forming process is: the edge of the bending plate in the first place in the first half of the pressure machine forming plate, and then the other half of the steel plate in another press forming, o-type circular tube is obtained. C forming production of welded pipe size appropriate, yield moderate, production line price is low.

6. PFP gradual bending forming process is the end of the bending plate in presses with small step length, more the number of times for sheet metal bending step by step, finally by the steel tube forming for pipe welding joint. PFP method for small quantity each time, so the press tonnage is not large, so the investment is small, this method can forming different diameter, different wall thickness of welded pipe, the diameter of the processing can be less than 406 mm, the production of welded pipe quality is better, production is moderate.