Flange duckbill valve is a kind of flange duckbill valve, its structure is composed of flange connection, the valve body adopts the structure of rubber, never rust or erosion using rubber and nylon yarn as well as advanced vulcanization craft manufacture, has a light weight, easy installation, long service life, etc.
Flange duckbill valve heat-resisting performance refers to the high temperature stainless steel can still maintain its excellent physical and mechanical properties.
Carbon: the influence of carbon in austenitic stainless steel is formed strong and steady. Set the austeniticausteniticarea and expand elements. Carbon formation of austenite is about 30 times that of the nickel, the ability of carbon is a kind of gap elements, through the solid solution strengthening can significantly increase the strength of the austenitic stainless steel. Carbon austenitic stainless steel can be improved in high concentration chloride (e.g., 42% MgCl2 boiling solution) in the performance of the resistance to stress corrosion.
But, in the austenitic stainless steel, carbon is often seen as the harmful elements, this is mainly due to the corrosion of stainless steel used in some conditions, such as welding or heating by 450 ~ 850 ℃), carbon steel with chromium in forming high chromium Cr23C6 type carbon compounds which can lead to local chromium depletion, make steel corrosion resistance especially resistant to intergranular corrosion performance degradation. Therefore, since the 60 s of the development of new cr-ni austenitic stainless steel is mostly carbon content less than 0.03% or 0.02% of the ultra-low carbon type, you can know as the carbon content is reduced, the steel intergranular corrosion sensitivity is reduced, when carbon content less than 0.02% is one of the most obvious effect, some experiments polishing also pointed out that the carbon will also increase the chromium austenitic stainless steel corrosion tendency. Due to the harmful effect of carbon, not only in the austenitic stainless steel smelting and shall be controlled according to the requirement as far as possible low carbon content, and later in the hot, cold and heat treatment process is to prevent the stainless steel surface carburization, and free of chromium carbide precipitation.
Because the flange mating flanges duckbill valve has good polishing performance, so he is widely used in coastal flooding, waste water, sand, dock, and no hatching county sewage drainage engineering
