Judging from the surface of the Q235B spiral steel pipe for sewage pipelines, whether the manufacturing process of the product is excellent or not, generally speaking, a good spiral steel pipe company must be careful during production, and there will be no friction defects. On the other hand, it is necessary to beat metal steel pipes. If the sound is crisp and the echo is not very dirty, choose spiral steel pipe instead of waste spiral pipe recycling. The following spiral pipe manufacturers briefly introduce the inspection methods of spiral steel pipes. The cross section of fake and inferior spiral steel pipes is oval. The reason is that in order to save material, the reduction amount of the first two passes of the finished roll is too large. The strength of this kind of rebar is greatly reduced, and it does not meet the standard of the external dimension of the rebar.
Today, the price of Q235B spiral steel pipes for sewage pipelines rose late, mainly due to the environmental supervision in North China in October. Low inventories underpin manufacturers’ confidence. However, according to short-term thinking, the fluctuation range of steel prices is small, and transactions are common after the price of Q235B spiral steel pipes rises. From January to April, infrastructure and real estate investment grew steadily, and demand for building materials was strong. However, in the later period, the growth rate of national fiscal revenue and expenditure may continue to slow down, and the cooling of real estate market sales will gradually shift to the investment side. In addition, as the off-season of seasonal demand approaches, it may be difficult for the Q235B spiral steel pipe market to continue to rise, so it is necessary to guard against high risks.
On the basis of ensuring safety, when stacking Q235B spiral steel pipes for sewage pipelines, attention should be paid to the stability of stacking. Products should be stacked according to different varieties and specifications, and should not be mixed together to prevent erosion. There are no requirements for departmental standard spiral steel pipes. You can observe it with your eyes. Secondly, in terms of tensile and impact test, Q235A steel material is not subjected to impact test, while Q235B steel material is subjected to V-gap impact test at room temperature. Relatively speaking, the mechanical properties of Q235B steel are far better than those of Q235A steel. Spiral submerged arc welded steel pipes are mainly used to transport oil and natural gas pipelines; spiral seam high frequency welded steel pipes are used for pressure fluid transportation.
Post time: Jun-20-2022