The cause and solution of the unroundness of spiral steel tube

- Apr 20, 2019-

The cause and solution of the unroundness of spiral steel tube

After the production of spiral steel tube, the section should be close to the circle. The standard requirement of ovality is that the maximum diameter should not be 1% larger than the nominal diameter, and the minimum diameter should not be 1% smaller than the nominal diameter.

When there is ellipse at the end of the spiral steel pipe, it is not easy to butt in the construction site. Then what kind of spiral steel pipe is most prone to ellipse?When the weld defects appear at the end of the spiral steel pipe, it is easy to appear ellipse after repairing.The ellipticity of spiral steel pipe must be carefully measured when there is repair welding at the end of the pipe or a large number of repair welding areas and butt plates in the pipe body, and repair shall be carried out if the phenomenon of exceeding the standard occurs.The elliptical defect of spiral steel tube is usually repaired by using a jack. The minimum diameter is measured and the minimum area is jacked so that the ellipticity can be measured after the jack is removed for one to five hours.For the ellipse that cannot be repaired, the quality inspection should be submitted in time to see whether this spiral steel tube is degraded or scrapped.


Cangzhou Steel Pipe Group (CSPG) Co., Ltd

Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.



Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects



Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555

 

Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners