Ductile Iron Foot Valve manufacturers take you to understand the precautions

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Jun 13,2022

Ductile Iron Foot Valve manufacturers tell you that ductile iron has rapidly developed into a widely used cast iron material, second only to gray iron. The so-called "replacing steel with iron" mainly refers to ductile iron.

quality Ductile Iron Bottom Valve from China manufacturer
1. The manufacturer of Ductile Iron Foot Valve tells you that the chemical composition is strictly required, and the carbon and silicon content of the original iron liquid is higher than that of gray cast iron, which reduces the content of manganese, phosphorus and sulfur in ductile iron.
2. The melting temperature of molten iron is higher than that of gray cast iron to compensate for spheroidization and the loss of molten iron temperature during inoculation treatment.
3. Carry out spheroidizing treatment, that is, add a spheroidizing agent to the molten iron.
4. Add an inoculant for inoculation treatment.
5. Ductile Iron Foot Valve manufacturers tell you that ductile iron has poor fluidity and large shrinkage, so it needs a higher pouring temperature and a larger pouring system size, rationally apply risers, cold iron, and adopt the principle of sequential solidification.
6. Perform heat treatment.
① Annealing. The ferrite matrix is ​​obtained, the plasticity and toughness are improved, the stress is relieved, and the cutting performance is improved.
② normalizing. A pearlite matrix is ​​obtained, which improves strength and wear resistance.
③Conditioning and tempering. Obtain the matrix structure of tempered sorbite and good comprehensive mechanical properties, such as main shaft, crankshaft, connecting rod, etc.
④ isothermal quenching. Ductile Iron Foot Valve manufacturers tell you that the parts with complex shapes and high comprehensive performance requirements can obtain the matrix structure of lower bainite, as well as comprehensive mechanical properties such as high strength, high hardness and high toughness, so as to avoid cracking during heat treatment, such as main shaft and crankshaft. , gears, etc.

Key words: Valve,Foot,valve

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