Ductile iron parts have been gradually used in the production of wear-resistant parts
2022-07-06
Ductile cast iron parts have low cost, good process performance, remelting and regeneration, resources and energy saving, so the application and development of this material is always lasting.Such as research and development of electric furnace double smelting technology and equipment; widely adopt advanced iron liquid desulfurization, filtration technology; thin-wall high strength casting manufacturing technology; cast iron composite manufacturing technology; cast iron surface or partial reinforcement technology; isothermal quenching ductile iron complete technology; color metal casting and metal type sand casting, continuous casting and other special processes and equipment.High strengthening and thin wall are the development direction of grey cast iron in China. Casting iron with thin wall, lightweight and strong toughness are designed to meet the requirements of engineering circles for energy saving and reuse of engineering materials, and to meet the needs of "human sustainable development strategy".For the production of cast iron parts, the particularity of the solidification mode and many influencing factors become more difficult.Alloy composition, graphitic expansion, casting stiffness and crystalline core all affect the final quality of the casting, but it is difficult to give a more accurate quantitative description.For example, alloy composition, due to the implementation of gestation, spherical chemical and other processes, it is difficult to determine the composition of iron when the final pouring.Casting iron surface layer laser reinforcement treatment and surface alloying technology of casting can form a metallurgical combined alloy layer on the surface of ordinary casting, making the casting has composite properties.The above technology has been gradually applied to the production of wear-resistant parts, and has achieved obvious results.Like the casting stiffness coefficient, the graphitization expansion coefficient is also difficult to give accurate values, and even can only have a qualitative description.
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