The advantages of cryogenic treatment of valves and the status quo of industrial applications

The advantages of cryogenic treatment of valves and the status quo of industrial applications

/
Low temperature cryogenic processing technology can significantly improve the service life of the materials are: high-speed steel, tool steel, die steel, copper electrode, powder materials, hard alloy, ceramic, etc. Examples of the use of cryogenic treatment to prolong the service life of parts by some American companies and some Chinese units are shown in Table 2 and Table 3, respectively. Table 4 shows the proportional coefficient of wear resistance change of some commonly used die materials after cryogenic treatment. Can enhance wear resistance; Enhance strength and toughness; Improve corrosion resistance, wear resistance; Enhance impact resistance; Increased fatigue strength…
Upper connection: Valve cryogenic treatment principle and its application in industry (2)
The advantages and industrial application of cryogenic treatment
3.1 Main advantages of cryogenic treatment
Can enhance wear resistance; Enhance strength and toughness; Improve corrosion resistance, wear resistance; Enhance impact resistance; Improve fatigue strength; After a cryogenic treatment, it can ensure that the treated material always has the improved mechanical properties; Does not cause the shape size deformation; Can be applied to new/used workpiece; Can eliminate internal stress; Improve material stability; The processing cost is low, because prolonging the tool life can reduce the time of tool change and grinding, so as to save the production cost; Can achieve the same surface results as other surface treatments (such as Chin plating, chrome, Teflon); Tighter molecular structures can be produced, reducing friction, heat and wear at larger contact surfaces.
3.2 The main workpiece that can be processed by cryogenic treatment
Cutting tool; Internal combustion engine parts; * * * tube; Tap; Transmission shaft; Medical instruments; Bit; The crankshaft. Agricultural machinery accessories; Milling cutter; CAM; Musical Instruments; Indexable blade; Axis; Stainless steel; Die; Gear; Nickel base alloy; Progressive die. The chain; Copper electrode material; Scissors; Shock rod; Ceramic materials; The blade; Extrusion rod; Aluminum base alloy; Get scissors; Nylon, Teflon; Powder metallurgy parts; All need in high hardness at the same time to have a relatively high degree of toughness, metal components.
3.3 Main industrial applications of cryogenic treatment
3.3.1 Extend the service life of parts and tools and improve the wear resistance
Low temperature cryogenic processing technology can significantly improve the service life of the materials are: high-speed steel, tool steel, die steel, copper electrode, powder materials, hard alloy, ceramic, etc. Examples of the use of cryogenic treatment to prolong the service life of parts by some American companies and some Chinese units are shown in Table 2 and Table 3, respectively. Table 4 shows the proportional coefficient of wear resistance change of some commonly used die materials after cryogenic treatment. As can be seen from the following three tables, cryogenic treatment produces different effects on parts and tools of different materials, and the wear resistance of parts and tools is significantly improved.
Table 2 Examples of some companies in the United States using cryogenic treatment to extend the service life of parts
Table 3 Examples of the service life of domestic cryogenic treatment high workpieces
Table 4 Life change of mold after cryogenic treatment
Table 5 Field production and test results of cryogenic treatment
3.3.2 Improve the stability of materials
Improving the stability of materials is another successful application of cryogenic treatment in aluminum, copper, Chin and 300 series stainless steels, most notably aluminum and its alloys.
3.3.3 Improve material properties
Cryogenic treatment can enhance and improve material properties, such as strength, fatigue resistance, corrosion resistance, etc. Table 5 shows the field results obtained from the application of university research and industrial research in industrial production.
With the development of modern industry, the requirements of material properties are higher and higher. There are two major trends in contemporary materials research:
① Constantly develop new technologies, new processes and new equipment to develop a variety of new materials with special requirements or excellent properties, such as rapid solidification, mechanical alloying, jet deposition, injection molding and other processes to develop microcrystalline, amorphous, quasicrystal, nanocrystalline structural and functional materials.
② For the existing traditional materials such as iron and steel, aluminum, copper using ultra-pure purification, large deformation processing, cryotreatment and other special processing and processing technology, in the basic does not change the composition of the existing materials on the basis of greatly improve its performance, so as to effectively improve the utilization and recovery of resources. At the same time, the material properties can be improved, and the cost can be reduced to reduce the damage to the environment, which undoubtedly provides a good way to solve the increasingly serious energy and environmental problems. So the studies of materials cryogenic treatment will become an important research direction of material science workers at home and abroad, but the stability of the existing research both in cryogenic treatment process and the mechanism of action of some materials research still exist many shortcomings, for the large-scale and application of cryogenic treatment on the industrial brought obstacles, Therefore, the development and research of stable cryogenic process system and cryogenic treatment mechanism of non-ferrous metals will be the focus of the research in this field.
With the development of science and technology and economy, valve specifications are more and more, and new and special valve varieties have emerged, which are far beyond the range of the valve covered by the existing valve model compilation method JB/T 308 in our country. The unified method of valve model compilation plays an important role in accelerating the collaborative development of the valve industry, further improving the industrial chain, and constantly refining the social division of labor.
First, the role of the valve model
With the development of science and technology and economy, valve specifications are more and more, and a variety of new and special valves are emerging, which are far beyond the range of the valve covered by the existing valve model compilation method JB/T 308 in our country. The unified method of valve model compilation plays an important role in accelerating the collaborative development of the valve industry, further improving the industrial chain, and constantly refining the social division of labor.
At the same time, due to valve industry increasingly fierce competition, each big valve manufacturers at home and abroad in order to be kept in petroleum, chemical, electric power and other major project bidding process can more embody the characteristics of their products, to protect their own economic interests, often do not use unified JB/T 308 valve model establishment method, by sui generis valve model establishment method.
Two, JB/T 308-2004 valve model preparation method
JB/T 308-2004 Valve Model Preparation Method is applicable to the model preparation of gate valves, globe valves, throttle valves, butterfly valves, ball valves, diaphragm valves, plug valves, check valves, safety valves, pressure reducing valves, steam traps, blowdown valves, plunger valves and other products in general valves.
The valve model stipulated by JB/T 308-2004 is composed of the following elements: valve type, drive mode, connection form, structure form, sealing surface material or lining material type, pressure code or working pressure code at working temperature, valve body material and other seven parts.
Valve type Code:
The valve type code consists of a special code and a basic code.
Basic code Name:
The VALVE TYPE CODE SHALL BE EXPRESSED IN Chinese PINYIN LETTERS AS PER TABLE 2.1 BELOW.


Post time: Aug-16-2022

Send your message to us:

Write your message here and send it to us
WhatsApp Online Chat !