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. Alloy pipe and seamless relationship with differentiated 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 according to the production process (with seam seamless) to define, and different from Seamless pipe is a seam, including the Longitudinal and spiral. 12CrMoV steel pipe ① steel beginning of the two numbers indicate the carbon content of steel, the average carbon content of the very few that, as 40Cr, 12CrMoV steel tube ② steel alloying elements, in addition to individual micro-alloying elements, generally in the hundreds parts per representation. When the average alloy content <1.5%, steel elements generally marked only symbols, not marked content, but prone to cause confusion in exceptional circumstances, after the element symbol can also be marked with the number "1", such as steel "12CrMoV" and "12Cr1MoV", the former chromium content of 0.4-0.6%, which is 0.9-1.2%, the remaining ingredients are all the same. When the average content of alloying elements ≥1.5%, ≥2.5%, while ≥3.5% ......, in the back of the element symbols should be marked content, can be expressed as the corresponding 2,3,4 ...... and so on. For example 18Cr2Ni4WA. ③ vanadium steel V, Ti Ti, Al AL, boron B, rare earth RE alloying elements are micro-alloying elements, although very low levels, should bid out in steel. For example 20MnVB steel. 0.07-0.12% of vanadium, 0.001 to 0.005% boron. ④ High quality steel should finally add "A" in the steel, as distinct from the general high quality steel. ⑤ special purpose alloy structural steel, and steel dubbed (or suffix) represents the symbol of the steel use. For example riveting Lo 30CrMnSi special steel, steel, said as ML30CrMnSi. Both alloy seamless pipe and existing relationship and differences, can not be confused. 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 according to the production process (with seam seamless) to define, and different from Seamless pipe is a seam, including the Longitudinal and spiral. 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 uses high temperature, corrosion resistance for petroleum, chemical, electric power, boiler industry with high temperature resistance, low seamless steel pipe specifications 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 sold in Luohe, Xinxiang Zhoukou Nanjing, Wuxi 24 × 2.5-3-4- 5-6 Luoyang, Xuchang, Pingdingshan, Hebi sold 25 × 2.5-3-4-5-6 sold Shangqiu Jiaozuo Zhumadian Puyang Sanmenxia 28 × 3-3.5-4-5-6 sold Nanyang Xinyang Zhengzhou, Kaifeng 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 east peace Hexi Nankai 42 × 3.5 Weinan Yulin, Yan'an Hanzhong -4-5-6-7-8-9-10 sold 56 × 3.5-4-5-6-7-8-9-10 sold to Xi'an, Baoji, Xianyang Tongchuan 68 × 4-4.5-5 Dazhou, Nanchong, Yibin, Guang'an -6-7-8-9-10-12-14-16 sold 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 146 Heyuan, Meizhou, Shanwei × 4.5-6-8-12-14-16-18-20-25-30 sold 180 × 32-34-38-40-45-50 sold Yangjiang, Maoming, Zhanjiang, Zhaoqing, Huizhou 219 × 30-40 -45-50-55 sold in 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 Texas 325 × 28-32-34-38-42 sold Weifang economic 宁泰安威海 377 × 30-37-40-45-50 sold Zibo Zaozhuang, Dongying, Yantai 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 pin CPIC to Changhua, Nantou Douliu new camp 820 × 12-20-35-50-65-85-100 sold Yixing Suzhou Wujiang Kun Shan Taicang quality products, reasonable prices, satisfactory service is our eternal business policy. The same breath, the same growth; a common destiny, common development, so that the spirit of enterprise and the personification of corporate values, to achieve "unity of human enterprise." "Cooperative competition, alliance win, win-win model" is our long-term development goals.