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A kind of high-strength and high-toughness ductile iron and its preparation method

A ductile iron, high toughness technology, applied in the field of metallurgical casting, can solve the problems of deformation and cracking of ductile iron, achieve good mechanical properties, avoid excessive stress and good stability

Active Publication Date: 2017-10-31
HANSHAN DONGSHAN DEYU SPHERULITIC GRAPHITE CASTING FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of industry, the performance index of existing ductile cast iron can no longer meet the needs of modern production, and there are phenomena such as deformation and cracking of ductile iron during heat treatment

Method used

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  • A kind of high-strength and high-toughness ductile iron and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A high-strength and high-toughness ductile iron, composed of the following elements by mass percentage: C 3.4%, Si 3.1%, Mn 0.7%, Mo 0.35%, Mg 0.025%, Zr 0.03%, Cr 0.85%, Ni 0.45% %, V 0.25%, Cu0.25%, RE 0.025%, the balance is Fe and unavoidable impurities.

[0020] The preparation method of high-strength and high-toughness ductile iron comprises the following steps:

[0021] 1) Smelting: Prepare raw materials, add them into the medium frequency induction furnace, raise the temperature to 1010°C, keep for 5 minutes, then raise the temperature to 1500°C for melting, obtain the original molten iron, and take it out of the furnace;

[0022] 2) Spheroidizing inoculation: Using the method of pouring into the bag, the silicon-barium alloy inoculant is covered on the surface of the rare-earth magnesium-silicon-iron nodularizing agent. 1.1% of the mass, placed in the bottom groove of the spheroidizing bag, preheating the spheroidizing bag to 630°C, injecting molten iron into t...

Embodiment 2

[0027] A high-strength and high-toughness ductile iron, composed of the following elements by mass percentage: C 3.3%, Si 3.2%, Mn 0.6%, Mo 0.4%, Mg 0.02%, Zr 0.035%, Cr 0.8%, Ni 0.55 %, V 0.2%, Cu0.2%, RE 0.03%, the balance is Fe and unavoidable impurities.

[0028] The preparation method of high-strength and high-toughness ductile iron comprises the following steps:

[0029] 1) Configure the raw materials, add them into the medium frequency induction furnace, raise the temperature to 1000°C, keep it for 4min, then raise the temperature to 1490°C for melting, obtain the original molten iron, and take it out of the furnace;

[0030] 2) Using the method of pouring into the bag, cover the silicon-barium alloy inoculant on the surface of the rare earth magnesium ferrosilicon nodulizer, the amount of the inoculant added is 0.5% of the mass of the molten iron, and the amount of the nodulizer added is 1.2% of the mass of the molten iron , placed in the bottom groove of the spheroid...

Embodiment 3

[0035] A high-strength and high-toughness ductile iron, composed of the following elements by mass percentage: C 3.2%, Si3.3%, Mn 0.5%, Mo 0.5%, Mg 0.01%, Zr 0.05%, Cr0.7%, Ni 0.6%, V 0.2%, Cu0.3%, RE 0.02%, the balance is Fe and unavoidable impurities.

[0036] The preparation method of high-strength and high-toughness ductile iron comprises the following steps:

[0037] 1) Configure the raw materials, add them into the medium frequency induction furnace, raise the temperature to 1020°C, keep it for 3min, then raise the temperature to 1480°C for melting, obtain the original molten iron, and take it out of the furnace;

[0038] 2) Using the method of pouring into the bag, the silicon-barium alloy inoculant is covered on the surface of the rare earth magnesium ferrosilicon nodulizer, the amount of the inoculant added is 0.4% of the mass of the molten iron, and the amount of the nodulizer added is 1.0% of the mass of the molten iron , placed in the bottom groove of the spheroid...

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Abstract

The invention discloses high-strength and high-toughness ductile cast iron. The high-strength and high-toughness ductile cast iron comprises the following element components, in percentage by mass, 3.2-3.5% of C, 2.8-3.3% of Si, 0.5-0.8% of Mn, 0.3-0.5% of Mo, 0.01-0.03% of Mg, 0.02-0.05% Zr, 0.7-1.0% of Cr, 0.4-0.6% of Ni, 0.2-0.3% of V, 0.2-0.3% of Cu and 0.02-0.04% of RE, with the balance being Fe and inevitable impurities. The invention further discloses a preparation method of the high-strength and high-toughness ductile cast iron. According to the high-strength and high-toughness ductile cast iron and the preparation method thereof, the elements in the ductile cast iron and the ratio of the elements are reasonably optimized; a casting is cooled in a heat treatment mode wherein water mist spraying and air cooling alternate, so that the casting after the heat treatment can be not easy for deforming and cracking; the prepared ductile cast iron is good in mechanical properties such as tensile strength, yield strength and impact toughness and good in stability.

Description

technical field [0001] The invention relates to the field of metallurgical casting, in particular to a high-strength and high-toughness ductile iron and a preparation method thereof. Background technique [0002] In the current highly developed society, the consumption of wear-resistant materials is huge. In mining, electric power, cement, agricultural machinery and other industries, the country also consumes millions of tons of wearing parts every year, with an output value of hundreds of billions of yuan. Today, when global resources are increasingly depleted, this is a huge resource consumption. For a long time, scholars at home and abroad have been committed to the development and research of high-quality new anti-wear materials to meet the needs of easy-wear consumables, from ordinary white cast iron, high manganese steel, nickel hard cast iron, high chromium white cast iron, etc. Ductile iron is a high-strength cast iron material developed in the 1950s, and its compre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/04C22C37/10C22C37/08C22C33/10C21C1/10
CPCC21C1/10C22C33/10C22C37/04C22C37/08C22C37/10
Inventor 裴德雨
Owner HANSHAN DONGSHAN DEYU SPHERULITIC GRAPHITE CASTING FACTORY