Chemical composition of precision light tubes and a variety of different materials comparison: carbon C, silicon Si, manganese Mn, S, phosphorus P, chromium Cr. 10 # 0.07 ~ 0.13 0.17 ~ 0.37 0.35 ~ 0.65 ≤0.035 ≤0.035 20 # 0.17 ~ 0.23 0.17 ~ 0.37 0.35 ~ 0.65 ≤0.035 ≤0.035 35 # 0.32 ~ 0.39 0.17 ~ 0.37 0.35 ~ 0.65 ≤0.035 ≤0.035 45 # 0.42 ~ 0.50 0.17 ~ 0.37 0.50 ~ 0.80 ≤0.035 ≤0.035 40cr 0.37 ~ 0.44 0.17 ~ 0.37 0.50 ~ 0.80 ≤0.035 ≤0.035 0.08 ~ 1.10 a precision steel delivery status. Processing (hard) last no heat treatment after cold working factory in Shandong Precision Tube so the tube is only possible deformation of two small, cold (soft) Finally, a small amount of cold precision tube deformation after heat treatment of steel plus hours to allow limited cold deformation. (eg: bending, flaring) three, cold After the last cold stress relief annealing were annealed at Acl points below the height of precision tubes to eliminate cold stress. Fourth, and finally, after annealing cold, under the protection of gas pipe fully annealed. After normalizing the last five cold, steel under protective gas normalizing Liaocheng precision tube |. Taizhou Precision Tube | Pipe Co., Ltd. is provided by virtue of virtue Liaocheng pipe 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 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!