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Molten iron of hundred-tonnage ferritic nodular cast iron casting and preparation method of molten iron

A technology of ductile iron and ferrite, which is applied in the field of casting and machinery manufacturing, can solve the problems of shrinkage, sand sticking, and wall thickness of hundred-ton ductile iron castings, and achieve the effect of excellent performance and not easy to stick sand

Active Publication Date: 2014-06-25
RIYUE HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, hundreds of tons of ductile iron castings have thick walls and high heat capacity, which are prone to defects such as sand sticking and shrinkage porosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The grinding disc casting has an external dimension of 5400mm×6000mm×2900mm, material QT450-10A, the thickest wall thickness is 600mm, the casting weight is 87000kg, and the pouring weight is 108000kg.

[0018] The mass components are: C 3.81%, Si 1.43%, Mn 0.32%, P 0.031%, S 0.061% molten iron obtained from cupola smelting is subjected to desulfurization treatment, and the mass components are: C 3.80%, Si 1.43%, Mn 0.32%, P 0.031%, S 0.018% desulfurized molten iron, and then heated the desulfurized molten iron to 1458°C in four medium-frequency induction furnaces with a capacity of 25 tons and a capacity of 45 tons respectively, using the flushing method Carry out spheroidization treatment on it, use 5 spheroidization treatment bags with a capacity of 25 tons to treat 4 bags of 21.5 tons of molten iron, and 1 bag of 22 tons, add 1.2% nodulizer, and carry out the first inoculation treatment during the spheroidization treatment. At the same time, Sb with a mass of 0.007%...

Embodiment 2

[0025] Injection molding machine template casting, the overall size is 5200mm×5200mm×2800mm, the material is QT450-10A, the thickest wall thickness is 580mm, the casting weight is 96000kg, and the pouring weight is 116000kg.

[0026] Desulfurization treatment is carried out on the molten iron obtained from cupola smelting with element mass composition of C 3.75%, Si 1.38%, Mn 0.36%, P 0.035%, S 0.064%, and the mass composition is: C 3.75%, Si 1.38%, Mn 0.36%, P 0.035%, S 0.016% desulfurized molten iron, and then heated the desulfurized molten iron to 1464°C in four medium-frequency induction furnaces with a capacity of 25 tons and a capacity of 45 tons, respectively. It carries out spheroidization treatment, uses 5 capacity 25 tons spheroidization treatment bags to process molten iron 23 tons 4 bags, 24 tons 1 bag, adds nodulizer 1.25%, carries out the first inoculation treatment during spheroidization treatment, in the inoculation treatment At the same time, Sb with a mass of...

Embodiment 3

[0033] Injection molding machine template casting, the overall size is 4980mm×4400mm×1330mm, the material is QT450-10A, the thickest wall thickness is 850mm, the casting weight is 100780kg, and the pouring weight is 113000kg.

[0034] The mass composition is: C 3.81%, Si 1.35%, Mn 0.40%, P 0.031%, S 0.061% by The molten iron obtained from cupola smelting is desulfurized to obtain desulfurized molten iron with mass components: C 3.80%, Si 1.35%, Mn0.40%, P 0.031%, S 0.018%, and then desulfurized molten iron in 4 sets of The capacity is 25 tons and a capacity of 45 tons is heated to 1470 ℃ in the intermediate frequency induction heat preservation electric furnace, and the spheroidization treatment is carried out by the flushing method, and 23 tons of molten iron are processed with 5 spheroidization treatment bags with a capacity of 25 tons, 4 bags, and 21 tons. 1 package, add 1.3% nodulizer, perform the first inoculation treatment during the nodularization treatment, add Sb wit...

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Abstract

The invention discloses a molten iron of a hundred-tonnage ferritic nodular cast iron casting. The molten iron comprises the following elements in percentage by weight: 3.50-3.90 percent of C, 2.30-2.70 percent of Si, 0.20-0.5 percent of Mn, less than or equal to 0.050 percent of P, less than or equal to 0.020 percent of S, 0.010-0.020 percent of Re, 0.03-0.040 percent of Mg, 0.002-0.008 percent of Sb and the balance of Fe and trace impurity elements. The hundred-tonnage molten iron provided by the invention can be used for manufacturing the hundred-tonnage ferritic nodular cast iron casting, is excellent in performance, and meets the requirement of GB / T1348-2009; by adopting the hundred-tonnage ferritic nodular cast iron casting manufactured according to a process, defects of sand burning, shrinkage porosity and the like are difficultly generated.

Description

technical field [0001] The invention relates to a casting process for ferrite ductile iron castings, which is applied to ductile iron products with a weight of hundreds of tons, belongs to the field of casting and machinery manufacturing, and specifically relates to a hundred-ton ferrite ductile iron castings. liquid and its preparation method. Background technique [0002] Due to its excellent performance, ductile iron is widely used in various industries. With the development of manufacturing industry, large thick-section ductile iron castings are used in metallurgy, machinery, transportation and spent nuclear fuel storage and transportation. [0003] Large-scale thick-section ductile iron castings are large in size, heavy in weight, thick in wall thickness, large in heat capacity during casting, and slow in solidification, which can easily cause spheroidization recession and inoculation recession, which will lead to changes in the structure and matrix of the casting, espe...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C33/10C21C1/10
Inventor 傅明康郑燕华宋贤发刘建东王铎张坤
Owner RIYUE HEAVY IND
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