The surface of the steel pipe is allowed to have slight defects such as scribes, scratches, misalignment of welds, burns and crusting that do not exceed the negative deviation of the wall thickness, allowing the thickness of the weld to be thickened and the internal weld bead to exist. The welded steel pipe should be mechanical. Performance test and flattening test and flaring test, and to meet the requirements of the standard, the steel pipe should be able to withstand a certain internal pressure, if necessary, carry out a pressure test of 2.5Mpa, keep no leakage for one minute, and allow the use of eddy current testing instead. Hydraulic pressure test, eddy current testing is carried out according to GB7735 "Steel Tube Eddy Current Testing Method".
The eddy current testing method is to fix the probe on the frame, and the flaw detection and the weld seam are kept at a distance of 3~5mm. The weld is fully scanned by the rapid movement of the steel pipe, and the flaw detection signal is automatically processed and automatically sorted by the eddy current flaw detector. To achieve the purpose of flaw detection, the welded pipe after the flaw detection is cut with the flying saw according to the specified length. After the inverted frame is taken off the wire, the ends of the steel pipe should be chamfered at the ends, and the marks are printed. The finished pipe is wrapped in a hexagonal package and then shipped.
Cangzhou Steel Pipe Group (CSPG)Co.,Ltd.
No.92 JieFang East Road ,Cangzhou City, Hebei,P.R.China.
CSPG has more than eighteen years history company which located in Lecong Iron and Steel World, a well-known steel distribution center in China, with superior geographical position and convenient water and land transportation.
We are a direct-selling manufacturer specializing in the research and development of spiral steel pipes, steel spiral pipes, anti-corrosion steel pipes inside and outside. Since its inception, the company has been guided by a brand-new thinking of steel pipe product market based on the business philosophy of honesty, pragmatism and knowledge-seeking.