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Nodulant for alloying nodular cast iron

A nodulizer and alloy ball technology, applied in the field of nodular cast iron production, can solve problems such as the limitation of the amount of returned charge, reduce the low-temperature impact toughness of nodular cast iron, etc., achieve less oxidation slag inclusions, improve purity and performance, and have a stable reaction Effect

Inactive Publication Date: 2010-04-14
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of Si in the returned charge, too high Si content will reduce the low temperature impact toughness of ductile iron, so the amount of returned charge is limited to a certain extent

Method used

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  • Nodulant for alloying nodular cast iron
  • Nodulant for alloying nodular cast iron
  • Nodulant for alloying nodular cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] ① Melt molten iron in a 500Kg intermediate frequency induction furnace by conventional methods.

[0020] ② with Cu-Mg-R E Nodulizer, nodulizer composition: 85wt% Cu, 14wt% Mg, 1.0wt% R E , the addition amount is 0.6wt% of molten iron.

[0021] ③Spheroidizing the original molten iron of ductile iron by the flushing method, the temperature of the molten iron is 1480°C, and the composition of the original molten iron is: 3.95wt%C, 1.25wt%Si, 0.20wt%Mn, 0.03wt%P, 0.022wt% S.

[0022] ④Using secondary inoculation treatment, the inoculant is 75wt% Si-Fe. In the first bag inoculation, the amount of inoculant added is 0.8wt% of the molten iron, and for the second inoculation with flow, the amount of inoculant added is 0.15wt% of the molten iron.

[0023] ⑤ Pouring castings and 70mm Y-shaped test blocks, furan resin sand casting molds, the pouring temperature is 1340 ℃ ~ 1360 ℃.

[0024] ⑥ Cut the sample on the 70mm Y-shaped test block and process it into 14mm tensile spe...

Embodiment 2

[0026] ① Melt molten iron in a 500Kg intermediate frequency induction furnace by conventional methods.

[0027] ② Use Cu-Mg-RE nodulizer, the nodulizer composition is: 92.5wt% Cu, 6.0wt% Mg, 1.5wt% R E , the addition amount is 1.2wt% of molten iron.

[0028] ③Spheroidizing the original molten iron of ductile iron by the flushing method, the temperature of the molten iron is 1500°C, and the composition of the original molten iron is: 3.90wt%C, 1.35wt%Si, 0.25wt%Mn, 0.025wt%P, 0.020wt% S.

[0029] ④Using secondary inoculation treatment, the inoculant is 75wt% Si-Fe. In the first bag inoculation, the amount of inoculant added is 0.8wt% of the molten iron, and for the second inoculation with flow, the amount of inoculant added is 0.15wt% of the molten iron.

[0030] ⑤ Pouring castings and 70mm Y-shaped test blocks, furan resin sand casting molds, the pouring temperature is 1340 ℃ ~ 1360 ℃.

[0031] ⑥ Cut the sample on the 70mm Y-shaped test block and process it into 14mm ten...

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Abstract

The invention relates to a nodulant for alloying nodular cast iron, which comprises the following elements in percent by mass: 83.5-94 percent of Cu, 5-15 percent of Mg and 1.0-1.5 percent of RE. By using the nodulant, the nodular cast iron can be nodulized and alloyed. Because the nodulant does not contain Si, the consumption of scrap returns can be increased to lower the production cost.

Description

technical field [0001] The invention belongs to the production technology of ductile iron, in particular to a nodularizer for alloy ductile iron. Background technique [0002] Ductile iron has good mechanical properties, forming and processing properties, good shock absorption and anti-friction properties, and is a commonly used engineering material. With the advancement of science and technology, the requirements for the mechanical properties of ductile iron are getting higher and higher. Alloying is the main measure to improve the mechanical properties of ductile iron. Cu is one of the most commonly used alloying elements. In addition, in the production process of nodular cast iron, a large amount of returned materials will inevitably be produced, such as pouring risers, waste products and machining chips. Due to the high content of Si in the returned charge, excessive Si content will reduce the low temperature impact toughness of ductile iron, so the amount of returned c...

Claims

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Application Information

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IPC IPC(8): C21C1/10C22C33/08
Inventor 王泽华吴宇宁周泽华江少群
Owner HOHAI UNIV
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