Alloy tube materials generally have: 16-50Mn, 27SiMn, 40Cr, 12-42CrMo 16Mn 12Cr1MoV T91 27SiMn 30CrMo 15CrMo 20G Cr9Mo 10CrMo910 15Mo3 15CrMoV 35CrMoV 45CrMo, 15CrMoG, 12CrMoV, 45Cr, 50Cr, 45CrNiMo alloy pipe and seamless relationship and there are differences alloy steel pipe is produced in accordance with the material (ie, material) to define the name suggests is made alloy tubes; and seamless steel pipe in accordance with the production process (with seam seamless) to define, and different from Seamless pipe is a seam, including the Longitudinal and spiral. Alloy tube with a hollow cross section, a large number of used pipes conveying fluids, such as transportation of oil, natural gas, gas, water and some solid materials, pipes and so on. Compared to other alloy steel pipe and solid steel bar, the same torsional strength in bending, lighter, alloy steel pipe is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive transmission shafts, bicycle frames and construction using steel scaffolding. With a steel pipe manufacturing ring parts Can improve material utilization, simplify the manufacturing process, saving materials and processing time, such as bearing rings, jack sets, it has been widely used to manufacture steel. Steel pipe or a variety of conventional weapons indispensable material, barrel, barrel would have to make steel. Different cross-section shape steel pipe can be divided into tube and shaped tubes. Since in perimeter of equal conditions, the largest area of ??a circle, with the circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of pipe is pipe. Manufacturing Process: 1. Hot-rolled (extruded seamless pipe): round tube → heating → perforation → three-roll rolling, rolling or extrusion → → set off pipe diameter (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage 2. cold drawn (rolled) seamless steel pipe: round tube → heating → perforation → Heading → annealing → pickling → oiled (copper) → multi-pass cold drawing (cold) → billet tube → heat treatment → straightening → hydrostatic test (testing) → mark → storage performance standards GB / T18984-2003 ASTM A333 Usage For -45 ℃ ~ -195 ℃ low grade pressure vessel piping, and low-temperature heat exchangers, pipes seamless Spot Size 16 × 2-2.5-4 sold in Huaiyin, Yancheng, Yangzhou, Zhenjiang, Taizhou 18 × 2.3-4-5 sold in Changzhou, Suzhou, Nantong, Xuzhou, Lianyungang 20 × 2.5-3-5 pin Nanjing, Wuxi to Xinxiang Zhoukou Luohe 24 × 2.5-3-4-5-6 sold Luoyang, Xuchang, Pingdingshan, Hebi 25 × 2.5-3-4-5-6 sold Shangqiu Jiaozuo Zhumadian Puyang Sanmenxia 28 × 3-3.5-4-5 Nanyang, Kaifeng, Zhengzhou, Xinyang -6 sold 32 × 3.5-4-5-6-8 sold Xiqing Hangu Dagang baodi Zhuzhou 34 × 4-5-6-8 sold Hongqiao Beichen, Wuqing, Jinnan Tanggu 36 × 3.5-5 -6-8 sold in Hebei, Hedong Hexi peace Nankai 42 × 3.5-4-5-6-7-8-9-10 sold Weinan Yulin, Yan'an Hanzhong 56 × 3.5-4-5-6-7-8-9- Xi'an, Baoji, Xianyang, Tongchuan sold 10 68 × 4-4.5-5-6-7-8-9-10-12-14-16 sold Dazhou, Nanchong, Yibin Kwong 76 × 4-4.5-5-6-7-8- 9-10-12-14 sold Guangyuan, Suining, Neijiang, Leshan 95 × 4.5-6-8-10-12-14-16-20 sold in Panzhihua, Luzhou, Deyang, Mianyang 127 × 4.5-5-6-7-8-10- 12-14-16-20 sold in Qingyuan, Dongguan, Zhongshan, Chaozhou, Meizhou, Shanwei 146 × 4.5-6-8-12-14-16-18-20-25-30 sold Heyuan, Yangjiang 180 × 32-34-38-40- 45-50 Zhanjiang, Maoming, Zhaoqing, Huizhou sold 219 × 30-40-45-50-55 sold Shantou, Zhuhai, Foshan, Jiangmen 273 × 7-9-12-15-18-20-25 sold Liaocheng Guangzhou Shaoguan Shenzhen 299 × 30 -32-36-38-40-45 sold Rizhao Laiwu Linyi Dezhou 325 × 28-32-34-38-42 sold Weifang economic 宁泰安威海 377 × 30-37-40-45-50 sold in Zaozhuang, Dongying, Yantai, Zibo 510 × 10-12-14-16-20-25-34-40-50 sold in Nanping, Longyan, Jinan, Qingdao 620 × 14-20-30-35-45-50-60 sold Fengshan, Pingtung, Taitung Matsubara 680 × 20-25-35-45-65-75-80 sold in Changhua, Nantou CPIC Douliu new battalion 820 × 12-20-35-50-65-85-100 sold Yixing Suzhou Wujiang Kun Shan Taicang