Mechanical properties and applications of industrial grade zirconium rods and tubes

Industrial grade zirconium and zirconium alloy have broad application prospects in chemical industry, petroleum and aviation because of their good mechanical properties and corrosion resistance in high temperature and high pressure environment. This paper describes the alloying principle of industrial grade fault and its alloy, analyzes the mechanical properties of R60702 and R60705 at different temperatures, and points out that the traditional stainless steel and nickel-based alloy structural parts or parts used in petroleum, chemical and medical industries can not fully meet the requirements of harsh working conditions. The application and research status of industrial grade fault and fault alloys in harsh corrosive environment such as sulfuric acid, acetic acid, hydrochloric acid and space technology are summarized. New industrial cobalt has shown excellent comprehensive properties and great application potential, so nuclear structural materials production and processing researchers We should further strengthen the technical research of new industrial Hao and strengthen its application, which is of great significance to accelerate the development of our industrialization and space field.

1. Mechanical properties of industrial zirconium

Traditional industrial zirconium and zirconium alloys are mainly R60702 and R60705. The mechanical properties at different temperatures are shown in FIG. 1 and FIG. 2. from FIG. 1 shows that the tensile strength and yield strength of R60702 bonded gold tend to decrease at room temperature to 350 ° C, while the elongation is first

After increasing, it decreases and then increases again. Therefore, 200 ℃ is the turning point of mechanical properties of R60702. As can be seen from Figure 2, at room temperature to 500 ℃ At the interval, the tensile strength and yield strength of R60705 alloy also decrease, while the elongation increases first and then decreases. with 200 C is the turning point of mechanical properties of R60705. However, the strength of R60705 alloy is better than that of R60702 when the temperature is lower than 200 ℃ Degree, while elongation is the opposite, so in practical application should be according to the need to choose, discriminate.

2, the application of industrial zirconium

Traditional stainless steel and nickel-based alloy structural parts or parts used in petroleum, chemical and medical industries can not fully meet the requirements of harsh conditions. Based on the good corrosion resistance and mechanical properties of zirconium, zirconium and zirconium alloy are playing an increasingly important role in chemical, pharmaceutical and other fields.

Traditional large sulfuric acid storage container refers to the capacity of more than 100 m3, composed of tank wall, tank top, tank bottom and accessories, the medium is 20% dilute sulfuric acid, working temperature of 120~140 ℃, design temperature of 180℃. Dilute sulfuric acid with a mass fraction of 20% is very strong

Higher requirements are put forward for the design and material selection of large acid storage tank. Although metal buttons and button silver have good corrosion resistance, the price is high (a storage tank made of button or button silver material is 3~4 times of a storage tank made of wrong material) and the manufacturing process of the equipment is immature, so industrial zirconium and zirconium alloy are often the first choice materials for large sulfuric acid storage containers.

In the acetic acid production process, the reactor is the core equipment, the working temperature is 185℃, the pressure is 28 MPa, the corrosive medium includes acetic acid, methane iodide, CO, etc., the working environment is very bad. Equipment using industrial grade cobalt material includes metal zirconium reactor, zirconium heat exchanger, pipeline, condenser, heat exchanger, pump, valve, agitator, tray, etc. Armor products mainly include zirconium tube, wide and thick plate, zirconium rod, large diameter zirconium pipe, zirconium pipe, zirconium forgings and other materials fully meet the needs of acetic acid chemical process.

At present, the junction equipment used in hydrochloric acid related process includes pumps, valves, pipes, condensers and evaporators. Cobalt has a wide corrosion resistance temperature range in the hydrochloric acid environment, such as the maximum temperature used in 10% hydrochloric acid and 37% hydrochloric acid ring

The maximum temperature used in the environment can reach 130 ° C. Zirconium metal has a long service life in hydrochloric acid. Practice shows that cobalt heat exchangers and pumps have been used for more than 20 years, and zirconium metal will not change the fuel color in hydrochloric acid environment.

Zirconium reactors and heat exchangers have been used in urea synthesis industry for more than 30 years. The use of industrial grade zirconium equipment allows the reaction to take place at higher temperatures and pressures, which allows the reaction to proceed faster. At present, zirconium material is used as the structural material of equipment in hydrogen peroxide production. The lead pollution in the circulating medium was reduced by manufacturing the hydrolyzed tube and the concentrated tube with industrial grade zirconium metal.

Space technology is the concentrated embodiment of the high and new technology level in the world today, and it is an important symbol to measure the comprehensive national strength of a country. With the moon exploration, deep space exploration, space exposure, space applications and other aspects of the mission more and more frequent, high reliability, long life, lightweight spacecraft design and

Manufacturing is the focus topic and direction of future space technology researchers. Traditional alloy steel and titanium alloy are far from being able to meet the long-term operation of space movable components in the harsh environment of low temperature, alternating temperature, irradiation, severe friction and wear and cold welding, etc. The literature adopts the means of optimizing the composition, and puts forward the best system and composition of metal zirconium materials which can be used as space movable components.

Zirconium alloy has been widely used in national economy, national defense construction, nuclear industry and other fields, especially in chemical production has a wide range of application prospects. With the development of chemical industry and space, it is urgent to develop new industrial milling products with high performance. Although our new industrial zirconium products are still in the initial stage of development, the new industrial zirconium products have shown excellent comprehensive properties and great application potential. Therefore, the researchers in the production and processing of nuclear structural materials should further strengthen the research on the new industrial fault technology and strengthen its application, which will speed up our industrialization and space

Development is of great importance.