Body of a variety of materials commonly used materials and heat-treatment analysis

Body a wide range of materials for a variety of working conditions.



Body of nine commonly used materials are as follows:



1. Gray cast iron, apply to work in temperature between -15 ~ +200 ℃, PN ≤ 1.6MPa Nominal pressure of low pressure valve.



2. Black heart malleable cast iron, apply to work in temperature between -15 ~ +250 ℃, nominal pressure PN ≤ 2.5MPa in the low-pressure valve.



3. Ductile iron, apply to work in temperature between -30 ~ +350 ℃, nominal pressure PN ≤ 4.0MPa in the low-pressure valve.



4. Carbon steel (WCA, WCB, WCC), applicable to operating temperature -29 ~ +425 ℃ in between, the high-pressure valves, which 16Mn, 30Mn working temperature between -40 ~ +450 ℃, commonly used to replace ASTMA105.



5. Low-temperature carbon steel (LCB), applicable to the work temperature -46 ~ +345 ℃ valve between the low-temperature valve.



6. Alloy Steel (WC6, WC9), applicable to operating temperature -29 ~ +595 ℃ in a non-corrosive medium between the high temperature and high pressure valves; WC5, WC12 applicable to operating temperature in between -29 ~ +650 ℃ the corrosive medium high temperature and high pressure valves.



7. Austenitic stainless steel, for operating temperature -196 ~ +600 ℃ in the corrosive medium between the valves.



8. Monel alloy, the main medium for the valve hydrogen fluoride.



9. Copper alloy, mainly applicable to operating temperature -273 ~ +200 ℃ in oxygen pipe used between the valve.



Body mentioned above is commonly used materials in the major categories, specific for each type of material, many different grades and different grades also apply to a variety of pressure levels. So, the choice of valve body materials, should be based on different uses and different pressure levels to determine the conditions suitable for the needs of the body material.



In addition, the valve body materials are titanium (titanium valves), aluminum alloy (aluminum valves); plastics (plastic valve); ceramics (ceramic valves) and so on.



Blank Body heat treatment process according to different materials are as follows:



1. Gray cast iron heat treatment.



In order to achieve different purposes, gray cast iron casting can be carried out in different heat treatment. Valve production of gray cast iron casting body parts, such as after the heat treatment process often chosen are: the elimination of casting thermal stress limitation and elimination of free cementite of high-temperature annealing. Thermal aging process is essential to work together. High temperature annealing only in the casting as a result of the chemical composition and casting cooling rate controlled, resulting in organizations that exist after casting cementite when the new-born to use it to replace the thermal aging.



2. Carbon steel heat treatment.



After the casting steel casting foundry with a large residual stress, and sometimes the organization of large steel castings, and even organizations overheat. Affect the dimensional stability of steel castings, to reduce the mechanical properties of steel and is not conducive to the conduct of cutting. In order to eliminate casting stress, refined organization, improve the mechanical properties and improved, such as machining, valve of carbon steel production body parts such as casting or after the regular choice of annealing normalizing + tempering processing.



3. Austenitic stainless acid-resistant steel-based heat-treatment.



Type austenitic stainless acid-resistant steel is easy to have a major flaw Intergranular corrosion of steel in general can be taken to impose certain measures to prevent heat-treated. Valve production type of austenitic stainless steel acid-resistant parts of the body such as the heat treatment process often selected were: solution heat treatment (quenching), the stability of the processing and cryogenic treatment.



4. Martensite heat-resistant steel-based heat treatment.



Martensite-type heat-resistant steel in the foundry should be promptly after the annealing, prevent the generation of cracks, and holding time should be sufficient annealing (usually 4 to 8 hours). Martensite-type heat-resistant steel annealed to remove stress, to carry out recrystallization, grain refinement, reduce stiffness, improve cutting performance and is ready to do a good job in the final heat treatment.



Martensite-type heat-resistant steel eventually normalizing + tempering heat treatment used to deal with.



5. High-quality carbon steel heat treatment.



Heat treatment of high-quality carbon steel to steel valve body 35, for example, steel valve body 35 to be normalizing after forging, heat treatment and its ultimate valve manufacturer in accordance with the provisions of technical documents in general to quenching and tempering treatment. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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