铸铁阀门和铸钢阀门有什么区别

铸铁和钢铁阀门之间的主要区别是碳含量，它直接影响钢的强度和塑性。碳钢又称碳钢，是含碳量小于2% 的铁碳合金。除碳外，碳钢通常还含有少量的硅，锰，硫和磷。根据其用途，碳钢可分为三类: 碳素结构钢，碳素工具钢，易切削结构钢。碳素结构钢可分为两种: 建筑结构钢和机器制造结构钢。按含碳量不同，碳钢可分为低碳钢 (WC ≤ 0.25%) 、中碳钢 (WC 0.25% -0.6%) 、高碳钢 (WC 0.6%)。根据磷和硫含量，碳钢可分为普通碳钢 (磷和硫含量较高) 、碳钢 (磷和硫含量较低) 和钢 (磷和硫含量较低)。通常，碳含量较高的碳钢具有较高的硬度和强度，但塑性较低。

cast iron

Cast iron is an iron carbon alloy with a carbon content of over 2%

Cast iron can be divided into

1. Gray cast iron 2, white cast iron 3, malleable cast iron 4, ductile cast iron 5, vermicular cast iron 6, alloy cast iron

Generally, what we refer to as cast iron valves are made of ductile iron, which is obtained by spheroidizing gray cast iron. The precipitated graphite is spherical, abbreviated as ductile iron. Compared to ordinary gray cast iron, it has higher strength, better toughness, and plasticity;

cast steel

Steel used for casting castings. A type of casting alloy. Cast steel is divided into three categories: cast carbon steel, cast low alloy steel, and cast special steel; Cast carbon steel. Cast steel with carbon as the main alloying element and containing a small amount of other elements. Low carbon steel with carbon content less than 0.2% is cast, medium carbon steel with carbon content ranging from 0.2% to 0.5% is cast, and high carbon steel with carbon content greater than 0.5% is cast. As the carbon content increases, the strength and hardness of cast carbon steel increase. Cast carbon steel has high strength, plasticity, and toughness, and low cost. It is used in heavy-duty machinery to manufacture parts that can withstand heavy loads, such as steel rolling mill frames, water pressure machine bases, etc; Used in railway vehicles to manufacture parts that are subjected to high force and impact, such as bolsters, side frames, wheels, and couplers;

From the above material characteristics, cast iron has stronger rigidity and greater brittleness than cast steel, and cast steel has better plasticity and toughness than cast iron. Therefore, cast iron is generally used in pipelines with lower pressure, and can only be used in pipelines at room temperature because an increase in pressure or temperature indicates a certain amount of slight deformation of the valve, which is unfavorable for cast iron valves. Compared to cast iron valves, cast steel valves can be applied in pipelines with higher pressure or temperature.

Application of cast iron valves

For example, we often see valves used for transporting tap water pipelines, with black paint sprayed on the valve surface. These types of valves are cast iron valves.