Silicon carbide reinforced synthetic vermicular graphite cast iron material and preparation method thereof

A technology of vermicular graphite cast iron and silicon carbide, which is applied in the field of silicon carbide reinforced synthetic vermicular graphite iron material and its preparation, can solve the problems of being easily affected by the international environment, low product yield, controlled by people, etc., and has a wide range of applications. , The effect of improving economic efficiency and reducing usage

Active Publication Date: 2022-04-12
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials of traditional casting use a large amount of pig iron, and there are strict requirements on the use of pig iron, high-quality, low-sulfur and low-phosphorus, but my country's pig iron can no longer meet the needs of high-performance cast iron solutio

Method used

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  • Silicon carbide reinforced synthetic vermicular graphite cast iron material and preparation method thereof
  • Silicon carbide reinforced synthetic vermicular graphite cast iron material and preparation method thereof
  • Silicon carbide reinforced synthetic vermicular graphite cast iron material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: A silicon carbide reinforced synthetic vermicular graphite cast iron material, ingredients calculation: the mass percentage of each element is: C: 3.8%, Si: 1.6%, Mn: 0.015%, P<0.03%, S<0.03%, Ti : 0.03%, Cu: 1.0%, Mg: 0.016%, and the balance is Fe and unavoidable impurities.

[0028] The specific preparation process is:

[0029] (1) Smelting and pouring: Add 45 parts by mass of returned material and 43 parts of 10 scrap steel, 2 parts by mass of silicon carbide (2 / 3 of the required amount of silicon carbide) and graphite with a particle size of 5-10mm and 10 parts by mass. The carbon agent is added to the medium frequency induction furnace for melting. The order of adding the charge is: return charge—the mixture of recarburizer and silicon carbide—scrap steel—other ferroalloys. The recarburizer and silicon carbide are placed in the middle of the furnace body. After melting, measure whether the content of C and Si elements in the molten iron meets the requir...

Embodiment 2

[0034] Example 2: A silicon carbide reinforced synthetic vermicular graphite cast iron material, ingredients calculation: the mass percentage of each element is: C: 3.6%, Si: 2.0%, Mn: 0.01%, P<0.03%, S<0.03%, Ti : 0.05%, Cu: 0.8%, Mg: 0.020%, the balance is Fe and unavoidable impurities.

[0035] The specific preparation process is:

[0036] (1) Smelting and pouring: add 50 parts by mass of returned charge, 45 parts of 45 steel scrap, 6 parts by mass of silicon carbide (2 / 3 of the required amount of silicon carbide), and 5-10 mm in particle size, 10 parts of graphite The carbon agent is added to the medium frequency induction furnace for melting. The order of adding the charge is: return charge—recarburizer and silicon carbide—scrap steel—other ferroalloys, recarburizer and silicon carbide are placed in the middle of the furnace body, and after melting, measure whether the content of C and Si elements in the molten iron meets the design requirements , fine-tuning by adding ...

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Abstract

The invention belongs to the technical field of metal material casting, and discloses a silicon carbide reinforced synthetic vermicular graphite cast iron material and a preparation method thereof. The vermicular graphite cast iron comprises the following components in percentage by mass: 3.0-4.0% of C, 1.0-2.0% of Si, 0.0-0.2% of Mn, Plt, 0.1-0.2% of Cr, 0.1-0.2% of Mo, 0.1-0.2% of Mo, 0.1-0.2 0.03%, Slt; the alloy comprises the following components in percentage by weight: 0.03% of Fe, 0.00-0.05% of Ti, 0.0-1.2% of Cu, 0.006-0.03% of Mg and the balance of Fe and inevitable impurities. The preparation method comprises the five steps of silicon carbide pretreatment, burdening, smelting, tapping vermicular inoculation treatment and pouring. According to the method, 3%-9% of pretreated micron-sized silicon carbide and graphite are added for recarburization to control the quality of molten iron of a synthesized vermicular graphite cast iron solution, the molten iron is purified, the graphite form is improved, a matrix structure is refined and strengthened, and on the premise that the comprehensive strength of the vermicular graphite cast iron is improved, the usage amount of raw material pig iron is reduced, the production cost is reduced, and the economic benefit is improved; in addition, the silicon carbide reinforced synthetic vermicular graphite cast iron can be popularized to preparation of all cast parts, and the yield is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of metal material casting, and relates to a silicon carbide reinforced synthetic vermicular cast iron material and a preparation method thereof. Background technique [0002] With the continuous improvement of the power density of modern diesel engines for new vehicles, the mechanical and thermal loads of key components such as engine blocks and cylinder heads have increased. Therefore, their strength, stiffness, heat resistance, fatigue resistance and process Performance and so on put forward more stringent requirements. Conventional gray cast iron is difficult to meet the service requirements, and often fails before reaching the service life, which leads to frequent accidents, seriously affects people's safe travel, and poses a great threat to people's life safety. [0003] Compacted graphite iron is a relatively new material in the cast iron family. Its tensile strength is comparable to malleable or duct...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C21C1/08
CPCY02P10/20
Inventor 李远陶栋杨忠张嘉晨贾旭明王震李建平杨喜岗
Owner XIAN TECHNOLOGICAL UNIV
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