Outline: curved shaped pipe is divided into two, a real bending, bending the other empty. The real curved outer wall square tube compacted, then bend bent inside and outside the tube-shaped steel roller compaction is a two-way process. The real curved rectangular tube is curved solid advantage will be relatively small, flat oval tube shaped tubes, and form a more accurate and production time, as long as a roll of accurate, oval tube shaped tubes, as well as internal The rebound of the steel pipe shaped pipe forming a more accurate perspective, we can guarantee accurate. Instant curved certain disadvantages, the main stretch of time will lead to thinning steel pipe, straight seam Pipes, really makes a rectangular tube bending bent, shaped, curved stretch of agricultural products, resulting in a curved line shaped pipe length in the longitudinal direction shorter, and metal content will stretch thinned since. Shaped Steel's performance index analysis - hardness hardness is a measure of the hardness of the metal material pointer. Production method for measuring the hardness currently most common method is the indentation hardness, it is certain geometry indenter under a certain load is pressed into the surface of a metallic material to be tested, to determine the hardness value according to the degree of being pushed. Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV) and other methods commonly used method. Flat oval tube shaped tubes | virtues Industry | Pipes by virtue Liaocheng Industry Co., Ltd. Flat oval tube shaped tubes | virtues Industry | Pipes Pipe Co., Ltd. is Liaocheng virtue (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) new year Upgrading introduced above picture for reference only, please call Tel picture on this page or to obtain the latest information, contact: Hvdroxide.