Antioxidant wear-resistant spheroidal graphite cast iron and preparation method thereof

A wear-resistant ball and anti-oxidation technology, which is applied in the field of nodular cast iron, can solve the problems of not meeting the use requirements and insufficient oxidation resistance of nodular cast iron, so as to improve the anti-oxidation and service life, improve the anti-oxidation growth performance, and good breeding effect of effect

Inactive Publication Date: 2018-10-12
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, the oxidation resistance of ordinary ductile iron is not enough, and the strength and wear resistance still need to be further improved, which cannot meet the use requirements in most cases.

Method used

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  • Antioxidant wear-resistant spheroidal graphite cast iron and preparation method thereof
  • Antioxidant wear-resistant spheroidal graphite cast iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] An anti-oxidation and wear-resistant nodular cast iron, the raw materials of which are calculated by weight components are: 50 parts of scrap steel, 15 parts of pig iron, 5 parts of graphite recarburizer, 2.2 parts of inoculant and 0.6 part of rare earth magnesium alloy nodulizer.

[0022] Its preparation method comprises the following steps:

[0023] a. Melt scrap steel and pig iron in an intermediate frequency induction furnace at 1450°C, and obtain molten iron after melting all of them and perform desulfurization treatment;

[0024] b. Mix it evenly with the nodulizer and pour it into the nodulizer bag, compact it, evenly cover a certain amount of inoculant, pour into two-thirds of the total amount of molten iron, and complete the nodularization treatment and the first inoculation treatment Finally, pour in the remaining one-third of the molten iron, and flush the rest of the inoculant with the flow to complete the second inoculation treatment, pouring, and castings;...

Embodiment 2

[0027] An anti-oxidation and wear-resistant ductile iron, the raw materials of which are calculated by weight components are: 51 parts of steel scrap, 16 parts of pig iron, 4 parts of graphite recarburizer, 2.3 parts of inoculant and 0.7 part of rare earth magnesium alloy nodulizer.

[0028] Its preparation method comprises the following steps:

[0029] a. Melt scrap steel and pig iron in an intermediate frequency induction furnace at 1460°C, and obtain molten iron after melting all of them and perform desulfurization treatment;

[0030] b. Mix it evenly with the nodulizer and pour it into the nodulizer bag, compact it, evenly cover a certain amount of inoculant, pour into two-thirds of the total amount of molten iron, and complete the nodularization treatment and the first inoculation treatment Finally, pour in the remaining one-third of the molten iron, and flush the rest of the inoculant with the flow to complete the second inoculation treatment, pouring, and castings;

[...

Embodiment 3

[0033] An anti-oxidation and wear-resistant ductile iron, the raw materials of which are calculated by weight components are: 52 parts of steel scrap, 17 parts of pig iron, 5 parts of graphite recarburizer, 2.5 parts of inoculant and 0.8 part of rare earth magnesium alloy nodulizer.

[0034] Its preparation method comprises the following steps:

[0035] a. Melt scrap steel and pig iron in an intermediate frequency induction furnace at 1470°C, and obtain molten iron after melting all of them, and perform desulfurization treatment;

[0036] b. Mix it evenly with the nodulizer and pour it into the nodulizer bag, compact it, evenly cover a certain amount of inoculant, pour into two-thirds of the total amount of molten iron, and complete the nodularization treatment and the first inoculation treatment Finally, pour in the remaining one-third of the molten iron, and flush the rest of the inoculant with the flow to complete the second inoculation treatment, pouring, and castings;

...

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Abstract

The invention relates to the technical field of spheroidal graphite cast iron, in particular to antioxidant wear-resistant spheroidal graphite cast iron and a preparation method thereof. The antioxidant wear-resistant spheroidal graphite cast iron is prepared from raw materials as follows: steel scrap, pig iron, a graphite carburant, a nucleating agent and a rare earth magnesium alloy spheroidizing agent. The preparation method comprises the following steps: melting the steel scrap and pig iron in a medium-frequency induction furnace at a certain temperature, and melting the steel scrap and pig iron to obtain molten iron and carrying out desulfurization and the like. The inner tissues and the surface tissues of the spheroidal graphite cast iron provided by the invention are uniformly and compactly distributed, the spheroidal graphite cast iron is high in the surface hardness and strength and good in toughness, oxidization resistance and wear resistance. The nucleating agent contains silicon, and can promote the cast iron to form a compact silicon dioxide oxidation film layer at a high temperature to prevent permeation and invasion of oxygen ions to a casting effectively to preventfurther oxidization, so that the anti-oxidant growth performance of the casting is improved greatly; by adding tungsten and chromium into the nucleating agent, the strength and plasticity of the spheroidal graphite cast iron can be improved; and by adding proper antimony, the quantity and the rate of spheroidization of spherulitic graphite can be increased.

Description

technical field [0001] The invention relates to the technical field of nodular cast iron, in particular to an oxidation-resistant and wear-resistant nodular cast iron and a preparation method thereof. Background technique [0002] The production of ductile iron in my country started very early. It was successfully developed and put into production in 1950. So far, the annual output of ductile iron in my country has reached 2.3 million tons, ranking third in the world after the United States and Japan. Ductile iron is a high-strength cast iron material whose comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some parts with complex stress and high requirements for strength, toughness and wear resistance. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. However, the oxidation resistance of ordinary ductile iron is not enou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C33/10C21D5/00C21D1/30C21C1/10
CPCC21C1/10C21D1/30C21D5/00C22C33/10C22C37/04Y02P10/20
Inventor 裴德雨
Owner HANSHAN DONGSHAN DEYU SPHERULITIC GRAPHITE CASTING FACTORY
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