How to determine the strength when making anticorrosive spiral steel tube
When the pipe is under internal pressure, two main stresses are usually generated on the pipe wall, namely radial stress Y and axial stress X.The resultant stress at the weld is = Y(l/4sin2 +cos2)1/2, where is the spiral Angle of the anti-corrosion spiral steel pipe weld.The spiral Angle of the anti-corrosion spiral steel pipe welding seam is generally 50-75 degrees, so the synthetic stress at the spiral welding seam is 60-85% of the main stress of the straight welded pipe.Under the same working pressure, the thickness of anticorrosive spiral steel pipe with the same diameter can be reduced than that of straight welded pipe.
According to the above characteristics, it can be known that:A when the anti-corrosion spiral steel pipe is exploded, because the normal stress and synthetic stress on the welding seam are relatively small, the blasting hole generally does not originate from the spiral welding seam, and its safety is higher than that of the straight welded pipe.B. When there is a parallel defect near the spiral weld, the risk of expansion of the spiral weld is less than that of the straight weld due to the small force on the spiral weld.
C. Since the radial stress is the maximum stress existing on the steel pipe, the maximum load will be borne when the weld is in the direction of vertical stress.That is, the straight seam bears the largest load, the circumferential weld bears the smallest load, and the spiral seam is between them.
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.
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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
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