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Large-section high-strength high-toughness spheroidal graphite cast iron profile and preparation method thereof

A nodular cast iron, high-strength technology, applied in the direction of improving process efficiency and reducing gas emissions, can solve problems such as graphite deformity, spheroidization and inoculation decline, and casting performance degradation

Inactive Publication Date: 2019-06-04
HANDAN HENGGONG METALLURGICAL MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a large-section, high-strength, high-toughness ductile iron profile and its preparation method, which solves the problem of spheroidization and inoculation decline in the core liquid core of a large-section ductile iron profile during production. , graphite converges and merges, the number of graphite crystal nuclei is small, and graphite is distorted, which makes the overall spheroidization rate of the profile low, the spheroidal graphite is thick, the graphite is deformed, and the performance of the casting is reduced. In severe cases, the casting may even be scrapped.

Method used

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  • Large-section high-strength high-toughness spheroidal graphite cast iron profile and preparation method thereof
  • Large-section high-strength high-toughness spheroidal graphite cast iron profile and preparation method thereof
  • Large-section high-strength high-toughness spheroidal graphite cast iron profile and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A large-section, high-strength, high-toughness ductile iron profile, which is made of QT500-7 material The profile is prepared from the following elements according to the mass percentage: carbon: 3.48%, silicon: 2.65%, manganese: 0.37%, magnesium: 0.048%, phosphorus 0.035%, sulfur: 0.01%, and the rest is iron. By adopting the above technical scheme, the obtained large-section ductile iron profile has good graphite shape, high graphite roundness, fine graphite, high graphite spheroidization rate, and the obtained large-section ductile iron profile has high strength and good toughness.

Embodiment 2

[0028] A method for preparing a large-section, high-strength, and high-toughness ductile iron profile, specifically comprising the following steps:

[0029] (1) Furnace preparation. After the combination of water-cooled graphite crystallizer and continuous casting and drawing holding furnace is installed, use natural gas to bake the continuous casting and drawing holding furnace. The baking time is 3-5 hours. Continuous casting before production The temperature in the holding furnace for drawing is 500-600°C;

[0030] (2) Ingredients, the above metal materials will be calculated and weighed with pig iron, scrap steel, recycled material, recarburizer, ferrosilicon block and ferromanganese according to the following target values: carbon: 3.55%-3.65%, silicon: 1.3%-1.4% , Manganese: 0.32%-0.42%, wherein the amount of pig iron selected is 50%-55% of the total mass of ingredients, and the amount of scrap steel selected is 30%-35% of the total mass of ingredients;

[0031] (3) Sme...

Embodiment 3

[0037] A method for preparing a large-section, high-strength, and high-toughness ductile iron profile, specifically comprising the following steps:

[0038] (1) Furnace preparation. After the combination of water-cooled graphite crystallizer and continuous casting and drawing holding furnace is installed, use natural gas to bake the continuous casting and drawing holding furnace. The baking time is 4 hours. Continuous casting and drawing before production The temperature in the holding furnace is 600°C;

[0039] (2) Batching, pig iron, steel scrap, furnace charge, recarburizer, ferrosilicon block and ferromanganese are calculated and weighed according to the following target values: carbon: 3.55%, silicon: 1.4%, manganese: 0.35%, wherein The selected amount of pig iron is 50% of the total mass of ingredients, and the selected amount of scrap steel is 35% of the total mass of ingredients;

[0040] (3) Smelting, using medium-frequency induction furnace for smelting, put the wei...

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Abstract

The invention belongs to the technical field of cast iron materials and casting metallurgy, and particularly relates to a large-section high-strength high-toughness spheroidal graphite cast iron profile and a preparation method thereof. The large-section high-strength high-toughness spheroidal graphite cast iron profile is prepared from the following elements in percentage by mass: 3.45-3.55% of carbon, 2.60-2.70% of silicon, 0.30-0.40% of manganese, 0.04-0.06% of magnesium, 0.025-0.06% of phosphorus, 0.008-0.015% of sulfur, and the balance of iron. The problems that when a large-section spheroidal graphite cast iron profile is produced, spherification and inoculation in a liquid core of the profile are faded, graphite is gathered and combined, the number of graphite crystal nuclei is small, the graphite is distorted, consequently, the overall spheroidization rate of the profile is low, spherulitic graphite is thick and big, the graphite is distorted, casting performance is reduced, and in the severe case, a casting is even scrapped are solved, and the advantage of high practicability is achieved.

Description

technical field [0001] The invention belongs to the technical field of cast iron materials and casting metallurgy, and in particular relates to a large-section, high-strength, high-toughness ductile iron profile and a preparation method thereof. Background technique [0002] Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some complex stress, strength, toughness, and wear resistance. Parts with high performance requirements. [0003] Ductile cast iron is obtained through spheroidization and inoculation treatment to obtain spherical graphite, which can effectively improve the mechanical properties of cast iron, especially the plasticity and toughness, so as to obtain higher strength than carbon steel. Therefore, the nodularization level of graphite affects the properties of ductile iron. According to GB / ...

Claims

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Application Information

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IPC IPC(8): C22C33/10C21C1/10C22C37/04C22C37/10B21C1/00
CPCY02P10/143Y02P10/20
Inventor 魏志勇王敬民孔令伟
Owner HANDAN HENGGONG METALLURGICAL MACHINERY CO LTD
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