Difference between titanium welded pipe and titanium seamless pipe and feasibility analysis of alternative field
What is titanium welded pipe?
Table of Contents
- What is titanium welded pipe?
- The production process of titanium welded pipe is as follows:
- Comprehensive advantages of titanium welded pipe
- What is titanium seamless pipe?
Titanium and titanium alloy straight seam welded pipe (hereinafter referred to as “titanium welded pipe“) is welded by rolling titanium and titanium alloy rolled strip or wide plate into tube shape. Titanium alloy grades in the United States are mainly gr.1, gr.2 and gr.12, while those in China are mainly TA1, TA2 and TA10.
The production process of titanium welded pipe is as follows:
Titanium strip coil longitudinal shear forming welding internal leveling (internal weld treatment) – shaping and sizing heat treatment (online bright annealing) – straightening – eddy current, ultrasonic testing – air tightness testing – sizing – finished welded pipe.
Yaang has a complete set of production process, which greatly improves the yield of products. The treatment of weld joint of titanium welded pipe has always been a thorny problem in the industry. Through several years of exploration and practice, yaang has successfully solved this industry problem, which is the realization of internal and external leveling of straight seam titanium welded pipe. Yaang’s titanium welded pipe and seamless titanium pipe have the same appearance. The performance parameters are close to and meet the requirements of seamless titanium tubes, which have been replaced in batches in some fields, such as tubular heat exchanger, coil heat exchanger, serpentine tube heat exchanger, condenser, evaporator and transmission pipeline, nuclear power, chemical industry, papermaking, water treatment, electric heating, etc.
Comprehensive advantages of titanium welded pipe
In China, the production technology of low strength and low alloying titanium seamless pipe is relatively mature. In some pipes that need high pressure resistance and structural stress, thick wall titanium seamless pipe is generally used. However, due to the influence of factors such as low yield and long delivery cycle of titanium seamless pipe, it has become the trend of titanium pipe industry to vigorously develop titanium welded pipe. Compared with titanium seamless pipe, the comprehensive advantages of titanium welded pipe are more and more obvious. In Japan, the United States, Europe and other countries and regions, titanium welded pipe is gradually replacing titanium rolling pipe.
The mechanical properties of titanium welded pipe and titanium seamless pipe are basically the same
Taking titanium and titanium alloy tubes for heat exchanger and condenser as an example, the national standard is GB / T3625-2007, and the American standard is ASTM B338. The chemical composition, mechanical properties and process performance of titanium welded pipe and titanium seamless pipe are not different or even the same. With the development of welding and heat treatment technology of titanium welded pipe, single gun or multi gun TIG / paw self fusion welding is widely used in domestic thin-walled titanium welded pipe. After welding, online heat treatment process is adopted. By optimizing welding and annealing process, the microstructure of base metal, weld and heat affected zone is basically similar, and the welding stress is eliminated and the weld microstructure is homogenized. Through comparison, it is found that the weld composition of titanium welded pipe is basically consistent with that of base metal, and the mechanical properties and corrosion resistance of weld are the same as those of base metal.
The appearance and quality of titanium welded pipe is better than that of titanium seamless pipe
Titanium welded pipe is welded by cold rolled strip coil, with uniform wall thickness, good concentricity, good finish, and is not easy to scale in the pipe. In particular, the production of thin-walled titanium tube by seamless rolling process can not meet the technical requirements. After rolling or drawing process, it is difficult to achieve the wall thickness of less than 1 mm for titanium seamless pipe, while the wall thickness of titanium welded pipe can be 0.5 mm or less, which saves a lot of materials and costs. At the same time, due to the thin wall thickness of titanium welded pipe, higher heat transfer coefficient and better heat transfer effect can be obtained.
Titanium welded pipe has outstanding advantages in cost and environmental protection
The production process of titanium seamless tube is complex. The tube blank of certain specification is rolled or drawn by three high or multi roll rolling mill and drawing machine, and then the seamless tube is produced by reducing diameter and wall. The production efficiency and yield of the process are low. Titanium seamless tube from sponge titanium to tube, through rolling or drawing, material waste is large, the yield is only about 50%, and can not achieve large-scale mass production, production cycle is relatively long.
Titanium welded pipe is produced by automatic continuous production line, using titanium strip with uniform wall thickness through cold bending, welding, on-line heat treatment, sizing and straightening, nondestructive testing and air tightness testing. From sponge titanium to welded pipe, the material utilization rate is usually about 80%. If titanium strip coil is used as raw material, the material utilization rate is more than 95%. With the rapid development of domestic titanium industry and the maturity of welding technology, the production efficiency of titanium welded pipe will be greatly improved, and the quality stability, consistency and production efficiency will be higher. It can be cut into the required length according to customer requirements, with short delivery time, high material utilization rate and lower unit cost than seamless pipe.
What is titanium seamless pipe?
Titanium seamless pipe is a kind of long strip pipe made of titanium or titanium alloy material with hollow section and no seam around. At first, it was mainly used to make aircraft engine compressor parts and structural parts of rockets, missiles and high-speed aircraft. Since the mid-1960s, it has been gradually used in the general industrial manufacturing fields, such as electrodes in the electrolysis industry, condensers in power stations, heaters in oil refining and seawater desalination, and environmental pollution control devices.
TA1, TA2 and TA3 are all industrial pure titanium. They have high mechanical properties, excellent stamping properties, and can be welded in various forms. The strength of welded joints can reach 90% of the strength of the base metal, and the cutting performance is good. Titanium tube has high corrosion resistance to chloride, sulfide and ammonia. The corrosion resistance of titanium in seawater is higher than that of aluminum alloy, stainless steel and nickel base alloy. The water impact resistance of titanium is also strong
An alloy consisting of titanium and other elements. It can be used in polluted sea water, water with high suspended solids content and at high flow rate.
Titanium seamless pipe is usually produced by rolling or drawing process. A lot of rolling oil and drawing oil will be used in the production process, and the pollution on the production site is serious. After rolling and drawing of titanium tube, degreasing and pickling of grease and dirt on the inner and outer surface of the tube are needed. The pickling process has a great environmental pollution. In order to ensure the health of operators and protect the environment, it is necessary to increase protective equipment and protective measures, so as to increase capital investment and the production cost of products. Titanium welded pipe is produced continuously and in large quantities through automatic production line, with stable quality and high production efficiency. In addition to certain energy consumption such as water and electricity, there is almost no pollution to the environment in the production process.
With the deepening of understanding of titanium welded pipe, the use of titanium welded pipe in petrochemical industry will be recognized by the market, the scope of use will be wider and wider, and the market share will be larger and larger. Although the investment cost of titanium welded pipe is higher than that of common fluid transportation pipeline, its cost is lower than that of titanium seamless pipe. From the analysis of service life and maintenance cycle of titanium welded pipe, the investment cost of titanium welded pipe can be compensated in use. The use of titanium welded pipe in pipeline system can reduce the number of regular maintenance, reduce the shutdown time, improve product quality and improve the pipeline life To reduce production costs. In particular, in recent years, the global titanium industry is not very prosperous, and the competition is very fierce. The price of titanium welded pipe has been at a low level. Enterprises in the petrochemical industry choose titanium welded pipe with lower equipment investment cost.
Although China’s titanium welded pipe industry has made rapid development, the production process and quality level have been greatly improved. Titanium welded pipe has been widely used in power, seawater desalination, water treatment equipment, air conditioning equipment and other industries, the use of titanium welded pipe in petrochemical industry is still being promoted.
Source: Network Arrangement – China Titanium Pipe Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)
(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)
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