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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 graphite distortion and nodular number, which reduces the mechanical properties of the ductile milled iron, and even leads to the scrapping of castings in serious cases.

Method used

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preparation example Construction

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

[0017] 1) The process of preheating ductile iron at 800-1000°C with pig iron, scrap steel, furnace charge, medium carbon ferromanganese and recarburizer;

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

[0019] 3) adding ferrosilicon, silicon-calcium inoculants, and silicon-strontium inoculants into the molten iron and stirring to obtain inoculated molten iron;

[0020] 4) A step of adding a spheroidizing agent into the inoculated molten iron and stirring to produce a large-section ductile iron.

[0021] In the present invention, the pig iron for ductile iron can be selected in a wide range, and can be Q10 or Q12 pig iron for ductile iron. In order to make the large-section ductile iron have more excellent mechanical properties, preferably, The pig iron for ductile iron is Q...

Embodiment 1

[0033] First, preheat 100kg of pig iron for ductile iron with grade Q10, 65kg of scrap steel, 60kg of returned furnace material, 1.5kg of iron filings, 0.2kg of antimony, 2.5kg of medium carbon ferromanganese and 0.3kg of coke at 900°C for 30min; then preheat The final raw materials were melted at 1480°C to produce molten iron; then 1.0kg of ferrosilicon with the brand FeSi90Al1.5, 0.9kg of silicon-calcium inoculant, and 0.7kg of silicon-strontium inoculant were added to the molten iron and stirred to obtain Inoculating molten iron: Finally, 2.5 kg of nodularizing agent with the brand name TS-4 was added to the inoculating molten iron and stirred to obtain large-section ductile iron.

[0034] Wherein, the steel scrap contains 0.3% by weight of carbon, 0.3% by weight of manganese, 0.01% by weight of phosphorus, the balance of iron and unavoidable trace elements; Carbon, 2.5% by weight of silicon, 0.07% by weight of manganese, 0.02% by weight of sulfur, 0.02% by weight of phosph...

Embodiment 2

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

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

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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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