Melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite

A technology of solid solution strengthening and nodular cast iron, which is applied in the field of nodular cast iron production, can solve the problems of large fluctuation range of casting hardness, difficult elongation to meet higher toughness requirements, and lower processing performance of castings, so as to reduce machining cost and hardness. Good uniformity and the effect of improving processability

Active Publication Date: 2017-07-07
德阳广大东汽新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In conventional ductile iron castings, precious alloy elements such as Cu and Mo are often added to make the content of ferrite and pearlite in the matrix structure reach an appropriate ratio to control the strength and ductility of the material; but its elongation is often affected by pearlite

Method used

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  • Melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite
  • Melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite
  • Melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite

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Experimental program
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Example Embodiment

[0025] Example 1

[0026] A smelting process for producing QT450-18 ductile iron using silicon solid solution strengthened ferrite, including the following steps:

[0027] 1) Optional raw materials, nodular iron pig iron, high-quality carbon scrap steel and reclaimed material for batching. The weight percentage content of each raw material is: nodular iron pig iron: 67%, carbon scrap: 8%, reclaimed material: 25%;

[0028] 2) Optional auxiliary materials yttrium-based heavy rare earth nodulizer, high calcium barium inoculant, ferromanganese, antimony ingot;

[0029] 3) For smelting, first add ductile iron pig iron, then add recharge, and finally add carbon scrap, the temperature of the melting process is controlled at 1330℃;

[0030] 4) Sampling and analysis of the charge after melting, adjust the composition according to the analysis result, the mass percentage of the chemical composition in the molten iron furnace after adjustment is: C: 3.62% C, Si: 1.32%, Mn: 0.18%; then the temperat...

Example Embodiment

[0034] Example 2

[0035] 1) Optional raw materials, nodular iron pig iron, high-quality carbon scrap steel and reheating material for batching, the weight percentage content of each raw material is: nodular iron pig iron: 65%, carbon steel scrap: 15%, reheating material: 20%;

[0036] 2) Optional auxiliary materials yttrium-based heavy rare earth nodulizer, high calcium barium inoculant, ferromanganese, antimony ingot;

[0037] 3) For smelting, first add ductile iron pig iron, then add recharge, and finally add carbon scrap, the temperature of the melting process is controlled at 1350℃;

[0038] 4) After the charge is melted, sample and analyze, adjust the composition according to the analysis result, the mass percentage of the chemical composition in the molten iron furnace after adjustment is: C: 3.58% C, Si: 1.61%, Mn: 0.21%; then the temperature is raised to 1463° C. and discharged.

[0039] 5) Carry out spheroidization inoculation treatment; spheroidize by flushing method, weigh t...

Example Embodiment

[0042] Example 3

[0043] 1) Optional raw materials, nodular iron pig iron, high-quality carbon scrap steel and reclaimed material for batching, the weight percentage content of each raw material is: nodular iron pig iron: 65%, carbon scrap: 20%, reheating material: 15%;

[0044] 2) Optional auxiliary materials yttrium-based heavy rare earth nodulizer, high calcium barium inoculant, ferromanganese, antimony ingot;

[0045] 3) For smelting, first add ductile iron pig iron, then add recharge, and finally add carbon scrap, the temperature of the melting process is controlled at 1350℃;

[0046] 4) Sampling and analysis of the charge after melting, adjust the composition according to the analysis result, the mass percentage of the chemical composition in the molten iron furnace after adjustment is: C: 3.76% C, Si: 1.85%, Mn: 0.29%; then the temperature is raised to 1475°C and discharged.

[0047] 5) Carry out spheroidization inoculation treatment; spheroidize by flushing method, weigh the au...

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Abstract

The invention discloses a melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite. In the melting process, 60-70% of nodular iron pig iron by weight is added firstly, then 15-25% of scrap returns by weight are added, finally, 8-20% of carbon steel scrap by weight is added, and the temperature is 1320-1390 DEG C; a pouring process is adopted for nodularizing-inoculating treatment, specifically, auxiliary materials are added in a nodulizing ladle according to the weight percentage of the auxiliary materials accoundting for the total amount of nodulizing iron liquid, 1.20-1.40% of a yttrium-based heavy rare earth nodulizing agent is evenly laid on one side of the bottom, the nodulizing agent is evenly covered with 1.60-1.90% of a high-calcium-barium nucleating agent, and 0.003-0.006% of an antimony ingot is added before discharging; and according to the original iron liquid analysis result, 0-0.20% of ferromanganese is additionally added, and the temperature is 1450-1480 DEG C. A casting prepared through the melting technique is good in hardness uniformity and cutting performance, and the machining cost of the casting is reduced.

Description

technical field [0001] The invention relates to the technical field of nodular cast iron production, in particular to a smelting process for producing ferrite nodular cast iron QT450-18 by adopting silicon solid solution strengthening. Background technique [0002] In conventional ductile iron castings, precious alloy elements such as Cu and Mo are often added to make the content of ferrite and pearlite in the matrix structure reach an appropriate ratio to control the strength and ductility of the material; but its elongation is often affected by pearlite. It is difficult to meet the requirement of higher toughness due to the influence of the quantity, and because of the existence of the "bull's eye" structure in the metallographic structure, the hardness of the casting has a large fluctuation range, which reduces the processing performance of the casting. In order to improve the processing performance of castings while ensuring high strength and high toughness and plasticit...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C21C1/10C21C7/00
CPCC21C1/10C21C7/00C21D2211/005C21D2211/009C22C33/08C22C37/04C22C37/10Y02P10/20
Inventor 徐俊洪王鹏坤于越方铭王加斌张委刘建勇陈红军吴协正
Owner 德阳广大东汽新材料有限公司
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