Liaocheng virtue of Industry Co., Ltd., Shandong Province is located in the beautiful northern Shuicheng - Liaocheng, q345 seamless steel pipe factory, located in the western Shandong Province, Pro Henan, Hebei, seamless steel pipe manufacturers in East China, Central China, north China region junction. Beijing-Kowloon Railway and Han Ji railway intersection in Shandong province, Shandong and Henan provinces is across the largest transportation and logistics hub, transportation is very convenient, is a professional commitment to seamless steel pipe production, processing and marketing enterprises. Companies with fluid pipes, structural seamless steel pipe, low pressure boiler tubes, high pressure boiler tubes, precision steel as the leading products, with the domestic advanced cold-drawn seamless steel pipe production line two, hot-rolled seamless steel pipe production line 2 , finishing seamless steel pipe thermal expansion pipe production unit and other units, can produce specifications 20-377 * 2-80mm, 20 #, 45 #, 16Mn seamless, Q345B seamless steel pipe; Specifications 10-219 * 1-30mm 20 # seamless pipe, 45 #, Q345B cold-drawn and cold-rolled precision seamless steel tubes; size 377 * 8-1020 * 60mm of Q345B, 45 #, 20 # seamless steel pipe thermal expansion and the like. Hot-rolled and cold rolled seamless steel pipes are steel or steel molding processes, they have a great impact on the microstructure and properties of steel, rolled steel, hot-rolled mainly based, only for the production of cold-rolled trumpet steel and sheet. A hot-rolled advantage: ingot casting can destroy tissue, grain refinement of steel, and eliminate defects microstructure, so that the steel dense tissue, improved mechanical properties. This improvement mainly reflected in the rolling direction, so that the steel is no longer certain extent isotropic body; forming bubbles when pouring, cracks and loose, seamless 8162 manufacturers, but also in high temperature and pressure Under it is welded. Disadvantages: 1. After the hot-rolled steel inside non-metallic inclusions (mainly sulphide and oxide, and silicate) is pressed into the sheet, stratification (mezzanine) phenomenon. Layering the steel in the thickness direction tension performance deteriorated significantly, small diameter seamless steel manufacturers, and there may be an interlayer tears during weld shrinkage. Weld shrinkage local strain-induced strain often reaches the yield point several times larger than the load-induced strain; 2. residual stresses caused by uneven cooling. The residual stress in the absence of external forces from internal equilibrium stress, hot-rolled steel has a variety of sections such residual stress, the greater the general steel cross-sectional dimension, the greater the residual stress. Although the residual stress is self-balanced, but still has some influence on the performance of the steel members under loads. Aspects such as deformation, stability, anti-fatigue may have an adverse effect. The virtues of small diameter seamless steel pipe industry manufacturers _ _ Liaocheng seamless steel pipe manufacturer Limited by virtue of Industry. Small caliber seamless steel pipe manufacturers _ _ seamless steel pipe industry manufacturers virtue is virtue Liaocheng Industry Co., Ltd (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com ) this year launched a new upgrade, the above picture is for reference only, please call the telephone or pictures on this page, for the latest information, contact: Hvdroxide.