A high-precision steel materials, precision bright tubes knowledge precision light tube is a pull through fine or cold-processed. Because precision light tube inside and outside the wall oxide layer, to withstand high pressure without leakage, high-precision, high-quality finish, cold deformation, flaring, flattening without cracks, which are able to make a variety of complex deformation and mechanical processing. Pipe color: white with bright, with high metal Q345B seamless cold drawn seamless cold drawn on the causes of cracks, annealing (780 ~ 830 ℃, 30min), the time for car straightening outer surface longitudinal cracks found , flattening test found a large crack. Metallographic, found the organization very uneven distribution between banded pearlite and ferrite crystal axis, although it is annealed precision steel 40 * 6, but more like hot rolled, hot-rolled or between annealed with the organization between. At the same time, the existence of large areas of pearlite, ferrite alternating large distribution state. At the same time, we found that the inclusions in the steel, the grade is probably in 2.5. Finally, the sloping bottom furnace heating temperature before piercing is 1180 ~ 1230 ℃, 35min, whether 58 * 6, the impact on the organization of suitable precision steel tubes. Please help experts to analyze next: First, uneven such organizations, is not caused by the slab; second, final finish annealing temperature, 780 to 830, issue appropriate it; and third, because cracks may what? The answer is as follows: The first organization is uneven tube causes. 16Mn previous steel grades, Q345B already changed, and it does not matter, pay attention to choose to perform a standard tube, a certain scale manufacturers of round trip, finished second annealing temperature is appropriate. Perforation heating temperature 1180 ~ 1230 ℃, low carbon steel which is the temperature, take 1230-1250 precision steel 100 * 6, it is appropriate. 35min furnace heating time or time? Oven time is generally more than 60min. Third precision steel, cracks may reason, I have done several tests. The result is tube (round) reasons mostly contain more internal cracks, inclusions, gas bags. Perforated temperature, process adjustments can not be ignored, if the temperature is low perforation, adjusted properly, will cause tearing capillary internal organization. Precision steel 58 * 6 | Quzhou precision steel pipes | virtue Pipe Co., Ltd. Liaocheng by virtue of Industry. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead virtue of Industry and you work into the brilliant, for a better future!