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Production process of high-strength and high-toughness as-cast ductile cast iron

A technology for ductile iron and production process, which is applied in the field of production process of as-cast high-strength and high-toughness ductile iron, can solve the problems of complex processing process and high production cost, and achieve the effects of simple process, low production cost and small ball diameter

Active Publication Date: 2017-06-13
喀左金牛机电设备科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing technology is complex and the production cost is high

Method used

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  • Production process of high-strength and high-toughness as-cast ductile cast iron
  • Production process of high-strength and high-toughness as-cast ductile cast iron
  • Production process of high-strength and high-toughness as-cast ductile cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1), material selection

[0036] Pig iron, low carbon steel and nodular cast iron are selected as smelting raw materials;

[0037] Wherein, the mass content of C in the pig iron is 4%, the mass content of Si is 1%, the mass content of Mn is 0.23%, the mass content of P≤0.05%, and the mass content of S≤0.04%;

[0038] The mass content of C in the low carbon steel is 0.2%, the mass content of Si is 0.35%, the mass content of Mn is 0.45%, the mass content of P is ≤0.03%, and the mass content of S is ≤0.03%;

[0039] The mass content of C in the ductile iron return charge is 3.45%, the mass content of Si is 2.85%, the mass content of Mn is 0.3%, the mass content of P is ≤0.04%, and the mass content of S is ≤0.03%;

[0040] (2) Ingredients

[0041] Raw material ratio: 500kg of pig iron, 374.5kg of low carbon steel, 100kg of ductile iron return charge, 8kg of 99% electrolytic copper; wherein the mass content of Mn in ferromanganese alloy is 64.5%, the mass content of Si is ...

Embodiment 2

[0051] (1), material selection

[0052] Pig iron, low carbon steel and nodular cast iron are selected as smelting raw materials;

[0053] Wherein, the mass content of C in pig iron is 4.3%, the mass content of Si is 0.78%, the mass content of Mn is 0.45%, the mass content of P≤0.05%, and the mass content of S≤0.04%;

[0054] The mass content of C in the low carbon steel is 0.4%, the mass content of Si is 0.25%, the mass content of Mn is 0.6%, the mass content of P≤0.03%, and the mass content of S≤0.03%;

[0055] The mass content of C in the ductile iron return charge is 3.9%, the mass content of Si is 2.6%, the mass content of Mn is 0.5%, the mass content of P is ≤0.04%, and the mass content of S is ≤0.03%;

[0056] (2) Ingredients

[0057] Raw material ratio: 562.5kg of pig iron, 200kg of low carbon steel, 195kg of ductile iron return charge, 3kg of 99.99% electrolytic copper; among them, the mass content of Mn in ferromanganese alloy is 65.5%, the mass content of Si is 1.2...

Embodiment 3

[0067] (1), material selection

[0068] The Q10 pig iron, low carbon steel and ductile iron produced by Benxi Iron and Steel Co., Ltd. are selected as smelting raw materials;

[0069] Wherein, the mass content of C in pig iron is 4.2%, the mass content of Si is 0.85%, the mass content of Mn is 0.3%, the mass content of P≤0.05%, and the mass content of S≤0.04%;

[0070] The mass content of C in the low carbon steel is 0.3%, the mass content of Si is 0.3%, the mass content of Mn is 0.5%, the mass content of P is ≤0.03%, and the mass content of S is ≤0.03%;

[0071] The mass content of C in the ductile iron return charge is 3.5%, the mass content of Si is 2.7%, the mass content of Mn is 0.4%, the mass content of P is ≤0.04%, and the mass content of S is ≤0.03%;

[0072] (2) Ingredients

[0073] Raw material ratio: 662kg of pig iron, 210kg of low carbon steel, 105kg of ductile iron return charge, 4kg of 99.9% electrolytic copper;

[0074] The mass content of Mn in the ferromang...

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Abstract

The invention discloses a production process of high-strength and high-toughness as-cast ductile cast iron. Raw materials including pig iron, low-carbon steel and ductile cast iron foundry returns are added to a medium-frequency melting furnace and heated to be molten, an efficient carburant, a manganese-iron alloy and a silicon-iron alloy are added to the medium-frequency melting furnace, and the mixture is molten into molten iron; firstly, a spheroidizing ladle is preheated, a spheroidizing agent is added to one side, close to a furnace body, of a dam of the spheroidizing ladle, an inoculant is taken and applied to the surface of the spheroidizing agent in a covering manner, metal nickel and metal titanium are added to the other side, close to the furnace body, of the dam of the spheroidizing ladle, the surface of the spheroidizing agent is covered with a perlite covering agent, part of molten iron is poured into the spheroidizing agent for a reaction, the remaining molten iron is poured into the spheroidizing agent after the reaction is stable, the remaining inoculant is added along with the flow for inoculation, the mixture is stirred sufficiently, a molten iron deslagging agent is added after slagging off, slag is rammed, silicon granules are added, the mixture is covered with the perlite covering agent after inoculation of unstable silicon, and a product is obtained after pouring and air cooling. The production process has the advantages that the process is simple, reasonable and low in production cost, heat treatment is not required, the product elongation is increased, and the mechanical performance of the product is good.

Description

technical field [0001] The invention relates to a production process of as-cast high-strength and high-toughness nodular cast iron. Background technique [0002] Ductile iron is a high-strength cast iron material whose comprehensive performance is close to that of steel. Ductile iron is widely used. It has been successfully used to cast some parts with complex stress, high strength, toughness and wear resistance. Realize "replacing steel with iron". Ductile iron QT900-2 is being used in auto parts for its high rigidity, fatigue strength and good wear resistance—such as automobile crankshafts. [0003] At present, in the production process of ductile iron QT900-2, the raw materials are first smelted and poured, then quenched and then normalized to improve the mechanical properties of the casting, increase its hardness, strength and wear resistance, and reach QT900-2 requirements. The processing technology is complex and the production cost is high. Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C22C33/10C21C1/10
CPCC21C1/10C22C33/10C22C37/04C22C37/10
Inventor 唐文杰张树臣高云鹏
Owner 喀左金牛机电设备科技有限公司
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