What are the material of the butterfly valve? The common butterfly valve materials include cast iron, cast steel, and stainless steel. Different materials for different working conditions, the use of the range and price will be different, we introduce one by one below.
First, cast iron
Subdivided into cast iron, there are gray cast iron, malleable iron, ductile iron, nickel cast iron four. This article mainly introduces the two kinds of cast iron materials that are manufactured by Bundor, including gray cast iron and ductile cast iron.
Gray cast iron is a cast iron with flake graphite, which is called gray cast iron because the fracture is dark gray when fractured. Gray cast iron is currently widely used cast iron, and its output accounts for more than 80% of the total output of cast iron. Gray cast iron casting properties, cutting performance, wear resistance are very good. Its disadvantages are the low strength, ductility and toughness compared with other cast irons.
The use of gray cast iron as a butterfly valve material is generally suitable for mediums with weak acid and weak bases such as water and air, and is not suitable for use in pipelines containing perchloric acid and nitric acid. Ductile cast iron is a kind of high-strength cast iron material. Its strength, toughness and wear resistance are very high. Its comprehensive performance is close to that of steel. At present, the scope of application of ductile iron is second only to gray cast iron. We often say "iron-based steel" refers to ductile iron. With ductile iron as the butterfly valve material, it has a certain degree of corrosion resistance, performance is much higher than the gray cast iron material butterfly valve, and its applicable medium includes steam, general properties of gas and oil and so on.
Second, cast steel
Cast steel is a cast iron alloy, a general term for iron-based alloys used to produce castings that do not undergo eutectic transformation during solidification. The advantages of cast steel materials are greater design flexibility and variability, improved overall structural strength and a wide range of weight changes. With cast steel as the butterfly valve material, the performance is better than cast iron but less than stainless steel. Casting steel butterfly valve is suitable for steam, non-corrosive gases, petroleum, etc.
Thrid, stainless steel
Stainless steel refers to steels resistant to weak corrosive media such as air, steam, and water, and chemically etched media such as acids, alkalis, and salts, and also called stainless acid-resistant steels. Usually stainless steel butterfly valve material, performance is very good, can be applied to more severe working conditions, in some ultra-high temperature, ultra-low temperature, strong acid and alkali corrosion of the media used, while the stainless steel butterfly valve is more rigid, more resistant Wear and long service life.
The above is the introduction of the material of the butterfly valve, usually according to the price, gray cast iron <sponge cast iron <cast steel <stainless steel.