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与管路系统相配套的管件主要有四种:管头、异径管(大小头)、三通和管帽.采用无缝管件可以减少管路传输阻力、提高抗腐蚀性和延长设备使用寿命.西北有色金属研究院在1991年首创无缝钛弯头之后,又试制成功钛无缝异径管管件.用旋压方法生产异径管虽然可行,但由于模具昂贵、生产周期长、效率低,难以适应市场需要.以往的异径管管件大多采用卷焊,卷焊工艺过程繁杂、成品率低、质量差,不能满足化工部标准.该院用特种热挤压法生产异径管,质量与无缝钛弯头一样达到了化工部要求,内外表面精度达到国标要求,金相组织为等轴状细晶粒,
There are four main types of pipe fittings that are compatible with the pipe system: pipe head, reducing pipe (size head), tee and pipe cap.Using seamless pipe fittings can reduce pipeline transmission resistance, improve corrosion resistance and extend equipment service life .Northwest non-ferrous metals Research Institute in 1991 after the first seamless titanium elbow, but also successfully trial production of titanium seamless pipe reducer.With spinning method to produce different diameter pipe though feasible, but due to expensive molds, long production cycle, low efficiency , Difficult to meet the needs of the market.Previous diameter pipe fittings are mostly used by volume welding, volumetric welding process complexity, low yield, poor quality, can not meet the standards of the Ministry of Chemical Industry. The hospital with special hot extrusion production of different diameter pipe, quality And seamless titanium elbow reached the same requirements of the Ministry of Chemical Industry, the internal and external surface accuracy to GB requirements, the microstructure is equiaxed fine grain,