The spiral steel pipe is a spiral steel pipe made of steel or coils by spiral -shaped tortuous, and actively welded with both sides and welded inner seams and outer seams. For the following reasons, it can be widely used in water, electricity, chemical industry. In the production of occupations: Just change the diverse viewpoint, you can use steel pipes with a steel with steel with the same width, which is easy to adjust.
Because it is one after another, the fixed ruler length of the spiral tube is not restricted, and the length can be determined at will. The weld spiral is evenly distributed on the entire spiral tube circle, so the screw tube has a high accuracy and strong strength. It is easy to change the scale, suitable for the production of small batch and various types of spiral tubes.
The welding of the spiral steel pipe is longer than the welds of the same standard straight gap. Under the same standard wall thickness, the spiral steel pipe has the most pressure. The disadvantages of the welded seam of the spiral steel pipe are "oblique disadvantages". During the use process, the main stress direction of the steel pipe, that is, the length of the equivalent disadvantages of the steel pipe axis is smaller than that of the straight seam pipe; second, because the pipeline steel is rolled steel plates, and the pipeline steel is rolled steel plate, and the pipeline steel is rolled steel plates, and the pipeline steel is rolled steel plates, and the pipeline steel is rolled steel plates, and the pipeline steel is rolled steel plates, and the pipeline steel is rolled steel plates, and the steel plate is rolled steel plates. The impact toughness has a large opposite sex, and the CVN value in the direction of the direction of the rolling direction can be 3 times higher than the CVN value perpendicular to the rolling direction.
The standard of the spiral steel pipe is distinguished according to its scope and acceptance regulations. The screw steel pipe scope of the spiral steel pipe of SY/T5037-2012 is a common fluid transportation pipe. Steel pipes, while GB/T3091-2008 spiral steel pipes are used for low-voltage fluid transportation pipes such as gas, water, air, air, heating, and steam.
Then, in terms of acceptance regulations, these three standard spiral steel pipe detection standards are different. The GB/T9711 standard spiral steel pipes should be stricter than SY/T5037 and GB/T3091. In the subordinate screw steel pipe and GB/T3091, the GB/T3091 acceptance standards must be stricter than the standard SY/T5037 standard.
In fact, these three standard wall thickness deviations are the same. The wall thickness of the wall thickness is 5mm-15mm. The wall thickness deviation is ± 1.5mm.
