Vermicular cast iron cylinder liner and preparation method thereof

A technology of vermicular graphite cast iron and cylinder liner, which is applied in the field of vermicular graphite cast iron cylinder liner and its preparation, can solve the problems of high production cost of cylinder liner, complicated austempering process, poor strength and wear resistance, etc., and achieves lower production cost and cost-effectiveness. The effect of high and high tensile strength

Inactive Publication Date: 2009-03-11
ZYNP GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the cylinder liners used in the society mostly use low carbon equivalent, add more alloy elements, and rely on alloy strengthening to meet the strength and wear resistance, such as phosphorus alloy cylinder liners, boron alloy cylinder liners, and molybdenum-nickel-copper alloy cylinders. The tensile strength of these materials is generally 200-300MPa, the hardness is 210-280HB, the strength and wear resistance are poor

Method used

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  • Vermicular cast iron cylinder liner and preparation method thereof
  • Vermicular cast iron cylinder liner and preparation method thereof

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Effect test

Embodiment 1

[0028] According to the weight percentage of each chemical composition: carbon 3.75%, sulfur ≤ 0.05%, silicon 1.5%, phosphorus 0.35%, manganese 0.6%, chromium 0.35%, copper 0.4%, and the balance is Fe for batching. The molten iron is smelted in a frequency conversion induction furnace, and the carbon equivalent of the furnace analysis is 4.58. When the fire is fired, 0.6% of the mass of the molten iron is injected into the molten iron to inoculate with a silicon-barium inoculant and 0.4% of a rare-earth silicon-iron-magnesium alloy creeping agent. The molten iron is melted at a temperature of 1432°C; the cylinder liner castings are produced by the conventional process of centrifugal casting of metal mold wet paint. The thickness of the coating is about 2mm, and the mold temperature is 441°C. The cylinder liner of vermicular graphite cast iron is obtained. Its chemical composition is 3.78% carbon, ≤0.05% sulfur, 2.28% silicon, 0.35% phosphorus, 0.6% manganese, 0.36% chromium, an...

Embodiment 2

[0030] According to the weight percentage of each chemical composition: carbon 3.7%, sulfur ≤ 0.05%, silicon 1.4%, phosphorus 0.3%, manganese 0.65%, chromium 0.3%, copper 0.35%, and the balance is Fe for batching. The molten iron is smelted in a frequency conversion induction furnace. The carbon equivalent is 4.51 according to the analysis before the furnace. The temperature is controlled to be 1440 ℃ and the molten iron is released from the furnace; the cylinder liner castings are produced by the conventional process of centrifugal casting of metal mold wet paint. The thickness of the coating is about 2mm, and the mold temperature is 454°C. The cylinder liner of vermicular graphite cast iron is obtained. Its chemical composition is 3.75% carbon, ≤0.05% sulfur, 2.08% silicon, 0.3% phosphorus, 0.61% manganese, 0.3% chromium, and 0.34% copper. The balance is Fe; its tensile strength is 443MPa and hardness is 272HB.

Embodiment 3

[0032] According to the weight percentage of each chemical composition: carbon 3.6%, sulfur ≤ 0.05%, silicon 1.35%, phosphorus 0.25%, manganese 0.75%, chromium 0.25%, copper 0.4%, and the balance is Fe for batching. The molten iron is smelted in a frequency conversion induction furnace. The carbon equivalent of the furnace analysis is 4.43. When the fire is fired, 0.7% silicon barium inoculant and 0.5% rare earth ferrosilicon magnesium alloy creeping agent are poured into the molten iron. The temperature is 1450°C, and the molten iron is released from the furnace; the cylinder liner castings are produced by the conventional process of centrifugal casting of metal mold wet paint. The thickness of the coating is about 2mm, and the mold temperature is 462°C. The cylinder liner of vermicular graphite cast iron is obtained. Its chemical composition is 3.7% carbon, ≤0.05% sulfur, 1.85% silicon, 0.25% phosphorus, 0.75% manganese, 0.27% chromium, and 0.38% copper. The balance is Fe; i...

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Abstract

The inventions relates to a vermicular graphite cast iron cylinder sleeve and a method for preparing the same. The weigh percentage chemical compositions of the vermicular graphite cast iron cylinder sleeve to the vermicular graphite cast iron cylinder sleeve are: 3.4 to 3.8 percent of carbon, less than or equal to 0.05 percent of sulfur, 1.8 to 2.6 percent of silicon, less than or equal to 0.50 percent of phosphor, 0.5 to 1.0 percent of manganese, 0.2 to 0.5 percent of chrome, 0.2 to 0.5 percent of copper and the balance of Fe. The vermicular graphite cast iron cylinder sleeve has good friction alleviation property, high tensile strength and fatigue strength. The property is superior to the prior alloy gray cast iron cylinder sleeve, can fully fulfill the requirements of the modern high-speed, highly-intensified, high-performance, low-exhaust, long service life and high-power internal-combustion engine, reduces the production cost, and has ratio of quality to price and simple preparation technology.

Description

(1) Technical field [0001] The invention relates to a vermicular graphite cast iron cylinder liner and a preparation method thereof. (2) Background technology [0002] At present, the cylinder liners used in the society mostly use low carbon equivalent, add more alloy elements, and rely on alloy strengthening to meet the strength and wear resistance, such as phosphorus alloy cylinder liners, boron alloy cylinder liners, and molybdenum-nickel-copper alloy cylinders. The tensile strength of these materials is generally 200-300MPa, the hardness is 210-280HB, the strength and wear resistance are poor, and they often cannot meet the requirements of contemporary high-speed, high-strength, high-performance, low-emission, and long-life internal combustion engines. Although the existing bainite gray cast iron cylinder liner with good mechanical properties and wear resistance has high content of nickel and molybdenum elements and complicated austempering process, resulting in high pro...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08B22D13/06
Inventor 徐超赵广华侯起飞秦小才殷建祥
Owner ZYNP GRP
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