Precision Precision tube is a tube through the drawn or cold rolling production of high-precision, high brightness of seamless steel tubes. Its inner diameter size can be accurate to within 0.2mm 20 号 precision steel production, to ensure bending and torsional strength, lighter weight, it is widely used in the manufacture of precision mechanical parts and engineering structures. Also used in producing a variety of conventional weapons, the barrel, shells, bearings. Precision Tube Uses: used in the manufacture of mechanical structure, hydraulic equipment, auto parts, steel sleeve. Materials commonly used material for the 10 #, 20 #, 35 #, 45 #, 20cr, 40Cr, 20CrMo 27simn ﹑ ﹑ ﹑ 16mn 304﹑201﹑310s ﹑ quality carbon structural steel. Precision Tube Features 1. Features a smaller outer diameter. High precision can do small batch production. 3. cold drawn finished high accuracy, good surface quality. 4 Steel Cross area more complex. 5. Pipe better performance, relatively dense metal expansion coefficient inspection methods can be put on the annealing furnace with soapy water gap at each joint to see if run gas; which places are most likely to run gas annealing furnace tube into place and out of the tube where seals are particularly vulnerable to wear and tear this place, we should always check often change. Presented before the roll forming of precision steel pretreatment technology programs; analysis of the normalizing temperature, holding time and cooling mode on the influence of raw material microstructure and mechanical properties of the tube; normalizing process to determine the conventional precision steel: heating temperature (890 ± 10) ℃, after holding 6min interspersed cooled. Conventional normalizing process can be completely eliminated widmanstatten precision steel to match the yield strength and tensile strength of more reasonable yield ratio σS / bσ≤0.78, elongation 5δ≥30%, cold forming and greatly improved performance avoid cold-formed crack. Tensile residual stress mainly from tensile residual stress generated in the device during the welding process. The current post-20 precision steel, widely used in welding engineering annealing cooling to eliminate residual stress, and is an important process of cooling after welding residual stress on the 20th precision steel, this approach is a waste of energy and prone to large welding residual stress. Post weld heat treatment is a novel technique to eliminate the residual stress. The precision steel before welding heat treatment temperature and preheat to the welding process weldments continued heating to maintain this temperature on the 20th precision steel specifications, welding is completed its insulation cotton insulation allowed to cool slowly. Quenching the steel to increase strength and hardness, but to reduce their plasticity. Quench hardening agent commonly used in water, oil, alkali and salt solutions and the like. Tempering precision steel will have to re-hardened precision steel heated to a certain temperature, and then some method of cooling is called tempering. Its purpose is to eliminate internal stress generated by hardening, reduce the hardness and brittleness, in order to obtain the desired mechanical properties. Tempering points tempering, tempering and tempering categories. Multi-quenching and tempering, normalizing conjunction. After quenching and tempering treatment hardening heat treatment method called quenching the 20th precision steel plant | Weifang the 20th precision steel | pipe industry by virtue virtue Liaocheng Industry Co., Ltd. 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 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!