What Is The Development History Of Titanium Tubes?

Titanium tubes have been used in civil industry for 25 years. Corrosion resistant titanium pipes are widely used in industries such as chemical, petrochemical, salt manufacturing, and non-ferrous metallurgy. Welded fittings are used for bends and intersections. The difficulty in construction and low lifespan of this pipeline are the weaknesses that affect the overall lifespan of the pipeline. After five years of effort, pipeline weld leakage has become a widespread engineering technology. The Northwest Nonferrous Metals Research Institute has successfully developed seamless titanium elbows, reducers, tees, and loop flange joints using a special extrusion method, filling the gap and ensuring that the construction and installation of titanium pipelines meet standards, and the service life of pipelines is more than doubled.
The birth of metal pipes has a history of over 200 years worldwide, but the serialization of metal pipes began in the 1920s. Generally, an integer in inches of the inner diameter is taken as the nominal diameter DN, forming a series. The regulations for outer diameter in the UK, US, and Japan are basically the same, known as the large diameter series. Germany, Italy, and Russia use small diameters to form small mouth series. It was not until 70 years ago that standards such as O01340336.0560 based on the UK and the US were formulated. The unit of length is millimeters. In the 1980s, various countries successively promulgated pipeline technology standards and achieved the unification of standard 060.
The standardization of domestic oil pipe parts began in the 1980s, with the initial standard being 117-84 (seamless bend pipe series) formulated by the Luoyang Petrochemical Department. On this basis, the Ministry of Chemical Industry announced hgj514 (seamless welded pipes for carbon steel and low alloy steel), and in January 1949, Sinopec announced shj408 (seamless welded pipes for steel), which led to the national standard GB12459-90 (seamless welded pipes for steel). The national standard is closer to the standard, and it is recommended to use the A series for the large-diameter series, and the B-series for the long-term use of the imitation Su series in China.
The standard for titanium alloy pipe fittings began to be formulated by the Northwest Nonferrous Metals Research Institute. QBridge01-93 (titanium and titanium alloy pipe elbows) and the new standard Qiao07-94 (titanium alloy welded seamless pipe fittings) are rich in content (including elbows, tees, reducers, loose flange joints, etc.), and their specifications comply with the national standard GB12459. The materials and other aspects comply with the relevant national standards for titanium.
The serialization of pipe fittings is based on the nominal diameter and is divided into 19 levels in inches or millimeters. The nominal diameter is a series of integers, similar to the inner diameter but not equal to the inner diameter. All external dimensions except for wall thickness can be determined based on nominal diameter and pipe type. The outer diameter of pipe fittings is a relatively important actual size parameter, and the table above also lists the outer diameter regulations for A series and B series. When designing and manufacturing new equipment, priority should be given to using the A series to achieve uniformity. However, considering that the B series has been in use in China for decades, the renovation of old equipment and systems cannot be achieved in a short period of time. Therefore, it is expected that the coexistence time of the B-series will be quite long.
According to the chemical standard hgj514-87, pipeline wall thickness is divided into H25, PN, and 14 levels, with pressure resistance levels of 2.5nnoa, 4.0a, 6.4bIA, and 10mpa, respectively. The wall thickness is determined based on the allowable stress of the material -128ny, the corrosion depth of the medium is on smart, and the wall thickness is s; For stainless steel, it is Sch. 5S, Attachment 8 of S-1. The value of sch. According to the pressure inside the container, the wall thickness value can be determined according to Appendix A of GB12459-90 "Classification Table for Wall Thickness of Seamless Steel Pipe Parts".