A low-temperature ductile super-thick ferrite ductile iron casting with large end face and preparation method thereof
A large end face, ferrite technology, applied in the field of foundry processing, can solve problems such as fragmented graphite, and achieve the effects of refining grains, improving toughness, and improving material strength
Active Publication Date: 2021-06-01
JIANGSU JIXIN WIND ENERGY TECH
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Problems solved by technology
Chinese patent CN110343944A discloses a ductile iron profile and process for improving fracture toughness; the profile in this patent belongs to thin-walled parts, and alloy bismuth (Bi) is added in its preparation process, but for thick and large end face ductile iron, Bi pole It is easy to cause the appearance of broken graphite
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[0020] provide a preparation The method of ferrite-based nodular cast iron test block with thickness end face, the steps are as follows:
[0021] 1. Based on MAGMA simulation software, the design size is The casting mold test block; the furan resin self-setting sand is used for molding; wherein, when throwing the mold, the outer layer of the casting mold is covered with a layer of general-purpose chilled iron with a thickness of 80-200mm;
[0022] 2. The type and scope of the control of trace elements are Mn≤0.10wt%, P≤0.01wt%, S≤0.01wt%, Ti≤0.01wt%, Cr≤0.01wt%, V≤0.01wt% ultra-high purity pig iron as raw material;
[0023] 3. Select low-rare-earth silicon-iron-magnesium alloy nodulizer, its main chemical composition is 40-50wt% Si, 5-6wt% Mg, 0.3-0.6wt% RE, and the addition amount is 1.1-1.3wt%;
[0024] 4. Adopt two inoculation processes before and after, including one inoculation during the process of introducing molten iron into the ladle, and inoculation with flow du...
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Abstract
The invention relates to a -40°C low-temperature ductile super-thick ferrite ductile iron casting with large end faces and a preparation method thereof. The invention is developed for the defects of super-thick and large-section ductile iron materials such as nuclear spent fuel containers, poor material structure and performance. The technical scheme of the invention; by strictly controlling the types and contents of trace elements of pig iron raw materials, rationally selecting nodulizers and inoculants, configuring reasonable mold cooling schemes, and adding Ni and Sb alloys and other improvement means, the invention creatively realizes ⌀800mm×800mm size castings have high impact and fracture toughness (V-shaped notch) at ‑40°C, making it feasible to apply ferrite-based nodular iron castings with ultra-thick and large end faces in extremely low-temperature harsh environments; in order to improve the material For strength, the conventional method is to increase the amount of Si, but if the amount of Si increases, it is easy to appear fragmented graphite. The invention refines grains, increases tensile strength, and improves toughness through alloying (Ni addition).
Description
technical field [0001] The invention relates to the technical field of casting processing, in particular to a -40°C low-temperature ductile super-thick ferrite ductile iron casting with large end faces and a preparation method thereof Background technique [0002] In recent years, with the large-scale development of nuclear power, hydropower, and wind power generating units, as well as the heavy-duty development of other construction machinery and equipment, the demand for super-thick and large-end ductile iron is becoming more and more urgent. Foreign developed countries have a relatively high level in the production of super-thick and large-face ductile iron castings. Germany's Siempelkamp Company produced ductile iron stamping machine brackets weighing 160 tons and having a wall thickness of 630 mm as early as 1983. France and Japan successively developed ductile iron castings weighing more than 100 tons and having a wall thickness greater than 400 mm. Spent nuclear spen...
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IPC IPC(8): C22C37/10C22C37/04C22C33/10B22D15/00
CPCB22D15/00C22C33/10C22C37/04C22C37/10
Inventor 王美喜余帆史学涌王卫国王强占进
Owner JIANGSU JIXIN WIND ENERGY TECH