Hangisi daha iyi, dökme demir mi yoksa sfero döküm vana gövdesi mi?

Dökme demir vana gövdeleri ve sfero döküm vana gövdelerinin her birinin kendine has özellikleri vardır. Hangisinin daha iyi olduğunu seçmek, özel uygulama senaryosuna ve ihtiyaçlara bağlıdır. Aşağıda ikisinin ayrıntılı bir karşılaştırması yer almaktadır:

1. Material and performance

• Cast iron valve body
• Malzeme: Cast iron is an alloy composed of three elements: iron, carbon, and silicon, and contains graphite in the structure.
• Performance: Low dissolution temperature, low energy consumption, good metal fluidity, suitable for casting parts with complex shapes. High process yield and good cutting performance. Since cast iron contains graphite in its structure, it can be mixed in the middle of the corrosion products to prevent corrosion from continuing, so it has a certain corrosion resistance, stronger water resistance than carbon steel, and can also resist alkali corrosion under certain conditions. However, it has weak acid resistance and low toughness, and its brittleness should be paid attention to during use.
• Ductile iron valve body
• Malzeme: Spheroidal graphite is obtained through spheroidization and inoculation treatment, which can effectively improve the mechanical properties of cast iron.
• Performance:
• High strength: The tensile strength of ductile iron is higher than that of gray cast iron and cast steel, and can reach the level of forged carbon steel. The yield strength is also higher than that of steel.
• High toughness: The elongation is better than that of gray cast iron, and the impact toughness is much higher than that of gray cast iron, which can meet the general requirements of most electromechanical product parts at work.
• Good elastic modulus and rigidity: The elastic modulus is higher than that of gray cast iron, and the rigidity is large, but slightly lower than cast steel.
• Excellent fatigue strength: More than twice that of gray cast iron, close to 45 steel.
• Good wear resistance, heat resistance and corrosion resistance: Although the vibration reduction is worse than that of gray cast iron, it is much better than steel.
• Good processing performance: The casting performance is worse than that of gray cast iron, but the processing performance is better, and the welding performance of ferritic ductile iron is also better.

2. Application occasions

• Cast iron valve body: Mainly suitable for normal pressure, normal temperature and general corrosion occasions, such as construction, municipal administration, etc. Its cost is low and can meet the requirements of valve strength and toughness for general working conditions.
• Ductile iron valve body: Suitable for harsh environments such as high temperature, high pressure, and high corrosion, such as petroleum, chemical, and electric power. At the same time, it is also suitable for some general occasions, such as construction, water supply, etc. Due to the superiority of materials and performance, ductile iron valve bodies are widely used in some important occasions.

3. Summary and suggestions

• Cast iron valve body: The advantages are low cost and good corrosion resistance, which are suitable for general working conditions. However, it should be noted that its toughness is low and its brittleness is large, and excessive impact should be avoided during use.
• Ductile iron valve body: It has the advantages of high strength, high toughness, excellent fatigue strength, and good wear resistance, heat resistance, and corrosion resistance, and is suitable for harsh working conditions. Although the cost is slightly higher, the overall performance is superior and it is worth investing.

In summary, cast iron valve bodies and ductile iron valve bodies have their own advantages. When choosing, comprehensive consideration should be given to factors such as specific application scenarios, working conditions, and cost budgets.