Large-section nodular cast iron and cast parts and preparation method thereof

A technology of ductile iron and large cross-section, applied in the field of large-section ductile iron, can solve the problems of ductile cast iron mechanical performance decline, casting scrap, graphite distortion and nodular number, etc., and achieve excellent tensile strength, easy to obtain raw materials, and simple preparation method Effect

Inactive Publication Date: 2014-12-10
WUHU GUODING MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Large-section ductile iron refers to ball milled castings with a template thickness greater than 100mm. This kind of ball milled castings often has defects of g

Method used

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Examples

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Example Embodiment

[0016] The present invention also provides a method for preparing the above-mentioned large section ductile cast iron, the preparation method includes:

[0017] 1) Preheating of pig iron for ductile iron, scrap steel, recycle material, medium carbon ferromanganese and recarburizer at 800-1000℃;

[0018] 2) The process of melting the preheated raw materials at 1460-1490°C to prepare molten iron;

[0019] 3) The process of adding ferrosilicon, silicon calcium inoculant, and silicon strontium inoculant to the molten iron and stirring to prepare the inoculated molten iron;

[0020] 4) The process of adding the spheroidizing agent to the inoculating molten iron and stirring to obtain large section ductile iron.

[0021] In the present invention, the pig iron for spheroidal graphite cast iron can be selected from a wide range, and it can be pig iron for spheroidal graphite cast iron with the grades Q10 or Q12. In order to make the large section spheroidal graphite cast iron with more excellen...

Example Embodiment

[0032] Example 1

[0033] First, preheat 100kg of pig iron for ductile iron with grade Q10, 65kg of scrap steel, 60kg of recycle material, 1.5kg of iron filings, 0.2kg of antimony, 2.5kg of medium carbon ferromanganese and 0.3kg of coke at 900℃ for 30min; then preheat The latter raw materials were melted at 1480°C to prepare molten iron; then 1.0 kg of FeSi90Al1.5 ferrosilicon, 0.9 kg of silicon calcium inoculant, and 0.7 kg of strontium silicon inoculant were added to the molten iron and stirred to prepare Inoculating molten iron; finally, 2.5 kg of a nodulizer of TS-4 grade is added to the inoculating molten iron and stirred to obtain large-section ductile iron.

[0034] Wherein, the scrap steel contains 0.3% by weight of carbon, 0.3% by weight of manganese, 0.01% by weight of phosphorus, the balance of iron and inevitable trace elements; the reheating material contains 3.7% by weight Carbon element, 2.5% by weight of silicon, 0.07% by weight of manganese, 0.02% by weight of sul...

Example Embodiment

[0037] Example 2

[0038] First, preheat 100kg of pig iron for ductile iron with grade Q10, 60kg of scrap steel, 55kg of recycle material, 1kg of iron filings, 0.15kg of antimony, 2kg of medium carbon ferromanganese and 0.2kg of coke at 800℃ for 30min; then preheat the preheated The raw materials are melted at 1460°C to prepare molten iron; then 0.8 kg of FeSi90Al1.5 ferrosilicon, 0.5 kg of silicon calcium inoculant, and 0.5 kg of silicon strontium inoculant are added to the molten iron and stirred to prepare molten iron. ; Finally, 2.0 kg of spheroidizing agent was added to the inoculated molten iron and stirred to obtain large section ductile iron.

[0039] Wherein, the scrap steel contains 0.3% by weight of carbon, 0.3% by weight of manganese, 0.01% by weight of phosphorus, the balance of iron and inevitable trace elements; the reheating material contains 3.7% by weight Carbon element, 2.5% by weight of silicon, 0.07% by weight of manganese, 0.02% by weight of sulfur, 0.02% by ...

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PUM

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Abstract

The invention discloses large-section nodular cast iron and cast parts and a preparation method thereof. Based on 100 parts by weight, the large-section nodular cast iron contains the elements in parts by weight: 3.6-3.8 parts of carbon, 2.5-2.8 parts of silicon, 0.5-0.6 part of manganese, 0.005-0.015 part of sulfur, 0.04-0.06 part of phosphorus, 0.03-0.04 part of magnesium, 0.028-0.035 part of strontium, 0.01-0.03 part of calcium and the balance of ferrum and unavoidable microelements. The cast parts prepared from the large-section nodular cast iron have excellent mechanical properties.

Description

technical field [0001] The invention relates to the field of large-section ductile iron, in particular to a large-section ductile iron, a casting and a preparation method of the large-section ductile iron. Background technique [0002] Nodular cast iron is spheroidal graphite obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, thereby obtaining superior mechanical strength compared with carbon steel. Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel, which makes it successfully used for casting castings with complex stress, high strength, toughness and wear resistance. [0003] Large-section ductile iron refers to ball milled castings with a template thickness greater than 100mm. This kind of ball milled castings often has defects of graphite distortion and nodular number, whi...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08
Inventor 俞家华
Owner WUHU GUODING MACHINERY MFG
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