Hebei size of the first factory - Changzhou Takizawa Pipe Sales Co., Ltd. (Diaoya Wen: 18731744075 0317-5128359) production concentric diameter pipe (size of the head), eccentric reducer (size of the head), seamless diameter pipe (size of the head), carbon Reducing steel tube (the size of the head), stainless steel diameter pipe (size of the head), the alloy diameter pipe (size of the head). Diameter pipe (size of the head) diameter pipe, also known as the size of the head. Chemical pipe, one for the connection of two different diameters. Is divided into concentric size of the head and Eccentric. Eccentric (diameter pipe) to see the pipe. Diameter pipe materials including stainless steel diameter pipe), carbon steel, alloy steel, diameter pipe size of the first steel q234q345 diameter pipe on the 20th. Diameter pipe Standard: GB, American Standard, British Standard and the kinds of non-high-pressure stamping. GD0506 ~ 0507 Pressure Vessels supporting the Ministry of Electric Power standard flange, tube sheet corresponding standards: JB/T4700 ~ 4707-2000 the implementation of national standards (GB/T9112-2000), Ministry of Machinery standards (JB81-59, JB/T74-94) Petrochemical Standards (SH3406-96), the Ministry of Chemical Industry standard (HG5010-58, with HG20592-97). Exports forged steel flange material meets United States ASTM.A105 standards. The production of seamless diameter pipe diameter pipe (size of the head) is used for pipe reducers at a pipe. Forming process commonly used to suppress necking, suppression of expanding or shrinking diameter plus expanding suppress diameter pipe can be applied to certain specifications stamping. Necking diameter pipe forming process is equal to the diameter pipe big end diameter tube into the forming die through repression along the tube axial direction, so that the metal forming along the movement of the mold cavity and contraction. Divided into according to the size of the adjustable diameter pipe be compaction or multiple compaction. Expanding shape is smaller than the diameter pipe big end diameter of the tube along the tube inner diameter of expanding within the die forming. The expanding process is mainly to solve the adjustable large diameter pipe is not easy by the shape of necking, and sometimes according to the materials and products shaping needs expanding combined with necking. Necking or expanding deformation of the pressing process, according to the different materials and adjustable to determine the use of cold or hot pressing. Under normal circumstances, maximize the use of cold pressing, and cause severe hardening of the situation on many occasions, adjustable, wall thickness of partial thickness or alloy materials should be used hot pressing. (b) stamping, in addition to the use of steel pipe diameter pipe can also be used on the part of the specification steel plate stamping process for the production of raw materials to produce different-diameter pipe. Stretch the use of die shape with reference to the inner surface diameter pipe size design, die cutting steel stamping, stretch forming.