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Vermicular graphite cast iron cylinder cover material of heavy-duty diesel oil engine and preparation technology thereof

A technology of vermicular graphite cast iron and heavy-duty diesel oil, which is applied in the field of vermicular graphite cast iron cylinder head material and its preparation technology for heavy-duty diesel engines, which can solve the problems of unable to stably produce cylinder head materials and insufficient mechanical properties of materials, and achieve the improvement of comprehensive mechanical properties, The effect of improving comprehensive mechanical properties and improving high temperature strength

Active Publication Date: 2019-02-15
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of insufficient mechanical properties of materials in the prior art and the inability to stably produce cylinder head materials with high creep rate, and to provide a material with high strength, high creep rate and guaranteed creep rate. Stable heavy-duty diesel engine vermicular graphite cast iron cylinder head material and its preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A heavy-duty diesel engine vermicular graphite cast iron cylinder head material. The matrix of the material is composed of pearlite and ferrite. The graphite structure in the matrix includes worm-like graphite and spherical graphite. The proportion of worm-like graphite is greater than 80%. The composition and weight percentage content are: C3.90%, Si2.50%, Mn0.50%, Mo0.4%, Cu0.70%, Cr0.3%, Mg0.01%, Re0.025%, P0.030 %, S0.010%, the balance is Fe and unavoidable impurities.

[0047] The above materials are prepared according to the following preparation process:

[0048] Melting molten iron: first add Q10 low-S pig iron, scrap steel, recycled materials, and high-purity graphite recarburizer into the smelting furnace, then add ferrosilicon, ferromanganese, copper, ferrochrome, and ferromolybdenum into the smelting furnace according to the required content for smelting , after the metal is completely melted, sprinkle a layer of slagging agent on its surface, carry out sla...

Embodiment 2

[0053] The difference with Example 1 is:

[0054] The raw material composition and weight percentage content of the cylinder head material are: C3.60%, Si2.10%, Mn0.70%, Mo0.5%, Cu0.75%, Cr0.2%, Mg0.014%, Re0 .028%, P0.040%, S0.010%, and the balance is Fe and unavoidable impurities.

[0055] In the step of smelting molten iron, the weight ratio of the Q10 low-S pig iron, steel scrap, and returned material is 40:50:10, and the temperature of the furnace is 1510°C;

[0056] In the ladle vermisification and inoculation treatment step, when the amount of molten iron flushed into the ladle reaches 85% of the total amount of molten iron, the inoculant is sprinkled into the second ladle, and the addition of the vermicular agent is 0.5% of the total amount of molten iron , the addition of the inoculant in the No. 1 bag is 0.3% of the total amount of molten iron, and the addition of the inoculant in the No. 2 bag is 0.3% of the total amount of molten iron;

[0057] In the flow inocul...

Embodiment 3

[0060] The difference with Example 1 is:

[0061] The raw material composition and weight percentage content of the cylinder head material are: C3.81%, Si1.90%, Mn0.51%, Mo0.6%, Cu0.85%, Cr0.4%, Mg0.025%, Re0 .04%, P0.030%, S0.010%, and the balance is Fe and unavoidable impurities.

[0062] In the step of smelting molten iron, the weight ratio of the Q10 low-S pig iron, steel scrap, and returned material is 35:55:10, and the temperature of the furnace is 1490°C;

[0063] In the ladle vermisification and inoculation treatment step, when the amount of molten iron flushed into the ladle reaches 80% of the total amount of molten iron, the inoculant in the second ladle is sprinkled, and the addition amount of the vermicular agent is 0.6% of the total amount of molten iron , the addition of the inoculant in the No. 1 bag is 0.45% of the total amount of molten iron, and the addition of the inoculant in the No. 2 bag is 0.35% of the total amount of molten iron;

[0064] In the flow ...

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Abstract

A vermicular graphite cast iron cylinder cover material of a heavy-duty diesel oil engine comprises the following raw materials in percentage by weight: 3.60-3.90% of C, 1.90-2.50% of Si, 0.50-0.70% of Mn, 0.4-0.6% of Mo, 0.70-0.85% of Cu, 0.2-0.4% of Cr, 0.01-0.025% of Mg, 0.025-0.04% of Re, not greater than 0.070% of P, not greater than 0.015% of S, and the balance Fe and inevitable impurities.A preparation technology comprises the steps of pressing from the bottom of a ladle and nucleating by a ladle bottom pouring method; supplementing a nucleating agent while 78-85% of molten iron is output; and then nucleating along with stream. According to the preparation technology adopting the design, the comprehensive mechanical property of the material is obviously improved; and moreover, thevermicularity and the pearlite content are stable; and the production cost is decreased.

Description

technical field [0001] The invention belongs to the field of heavy-duty diesel engine materials, and specifically relates to a heavy-duty diesel engine vermicular graphite cast iron cylinder head material and a preparation process thereof, which are suitable for significantly improving the comprehensive mechanical properties of the material, ensuring the stability of the vermicularization rate, and reducing production costs. Background technique [0002] In the context of increasingly stringent emission regulations and vehicle load restrictions, traditional gray cast iron cylinder heads can no longer meet the requirements of high explosion pressure, high power density, and light weight of heavy-duty diesel engines. Compared with gray cast iron, compacted graphite cast iron has higher tensile strength and elastic modulus, and the same size and shape of compacted graphite cast iron cylinder head is light in weight, can withstand higher burst pressure, withstand higher thermal c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/10
CPCC22C33/10C22C37/06C22C37/10
Inventor 袁福安康明王林涂欣达霍卯田金通曹宇峰
Owner DONGFENG COMML VEHICLE CO LTD
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