Pneumatic valve body analysis of commonly used materials and various materials heat treatment 1

Gray cast iron, suitable for working temperature in - ~ + ℃, nominal pressure PN or less. The low pressure pneumatic valve MPa. Blackheart malleable cast iron, and is suitable for the working temperature in - ~ + ℃, nominal pressure PN or less. MPa in low pressure pneumatic valves. Nodular cast iron, suitable for working temperature in - ~ + ℃, nominal pressure PN or less. MPa in low pressure pneumatic valves. Carbon steel, WCA、WCB WCC) , suitable for working temperature in - ~ + ℃ between medium and high pressure pneumatic valve, Mn, Mn for - operating temperature Between ℃ ~ +, commonly used as a substitute for ASTMA. Low temperature carbon steel ( LCB) , suitable for working temperature in - ~ + ℃ low temperature between pneumatic valve pneumatic valve. Alloy steel ( 厕所、厕所) , suitable for working temperature in - ℃ ~ + between the corrosive medium of high temperature and high pressure pneumatic valves; Temperature in - WC, WC is suitable for the work ℃ ~ + between the corrosive medium of high temperature and high pressure pneumatic valves. Austenitic stainless steel, suitable for working temperature in - ℃ ~ + between the corrosive medium of pneumatic valve. Monel alloy, mainly is suitable for the hydrogen fluoride medium pneumatic valves. Cast copper alloys, mainly is suitable for the working temperature in - ~ + ℃ between oxygen pipe with pneumatic valve.
the above list is a commonly used materials in the pneumatic valve body types, each type of specific materials, and there are many different brands, a variety of different type and is applicable to a variety of different pressure levels. Therefore, when choosing pneumatic valve pneumatic valve body materials, should according to different purposes and different pressure levels, determine suitable for the working condition of need of pneumatic valve body material.
in addition, the pneumatic valve body materials and titanium alloy ( Titanium pneumatic valve) , aluminum alloy, Aluminum pneumatic valve) ； Plastic ( Plastic pneumatic valve) ； Ceramic ( Ceramic pneumatic valve) And so on.

aerodynamic body blank heat treatment process according to different materials as follows:
. Grey cast iron heat treatment.
in order to achieve different purposes, gray cast iron in casting can be done after different heat treatment. In the production of pneumatic valves on aerodynamic body parts such as grey cast iron in casting often choose after heat treatment process are: heat ageing to eliminate casting stress and eliminate the high temperature of the free cementite annealing. A process with the thermal aging is a must. High-temperature annealing only in casting because of improper control of chemical composition and casting cooling rate, cause after casting organization exists in the primary cementite when use it to replace the thermal aging.
. Carbon steel casting, heat treatment.
the casting residual stress of casting steel after casting has a large, sometimes the organization of the steel is bulky, and even overheat organize. All of these affect steel casting dimension stability, reduce the mechanical properties of steel and is not conducive to cutting. In order to eliminate casting stress, refine the organization, improve mechanical properties and processability, etc. , cutting in the production of pneumatic valves for carbon steel valves after casting often choose pneumatic annealing or normalizing + tempering treatment.
. Austenite size acid-proof stainless steel heat treatment.
the main defects of the austenite size stainless acid-resistant steel are prone to intergranular corrosion, can take on heat treatment of steel to a certain commonly prevention measures. In the production of pneumatic valves for austenite stainless acid-resistant steel size valves often choose the pneumatic heat treatment process are: solid solution treatment ( Quenching) , stabilizing treatment and cryogenic treatment.
. Markov shape of heat resistant steel heat treatment.
martensite heat-resistant steel in casting size after annealing, in time to prevent the cracks, and annealing holding time to be sufficient, Generally for ~ hours) 。 Markov body heat resistant steel annealing is aimed at eliminating stress, recrystallization, refine the grain size, lower hardness, improve machinability, and organization good preparation for the final heat treatment.
markov shape heat-resistant steel eventually normalizing + tempering heat treatment processing.
. High quality carbon steel heat treatment.
# quality carbon steel heat treatment for forging steel pneumatic valve as an example, the number of steel pneumatic valve body to be normalizing after forging, and the final heat treatment according to the provisions of the pneumatic valve manufacturing technical documents, to be quenched and tempered treatment commonly.