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As-cast bainite vermicular graphite cast iron cylinder jacket and its preparation method

A technology of vermicular graphite cast iron and bainite, which is applied in the field of as-cast bainite vermicular graphite cast iron cylinder liner, can solve the problem that the explosion pressure increases, and the alloy bainite is difficult to meet the working requirements and design life of high-end engines. Further improvement and other issues to achieve the effect of improved reliability, high strength, and increased service life

Inactive Publication Date: 2012-06-27
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the cylinder liners used in high-end high-power medium and heavy-duty engines are mostly alloy bainitic gray cast iron cylinder liners, whose strength and wear resistance can meet the working requirements and design life of existing engines; characteristics, after its tensile strength reaches above 400MPa, it is difficult to improve
However, with the further increase of engine power and the further increase of explosion pressure, it is difficult for alloy bainite to meet the working requirements and design life of future high-end engines.

Method used

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  • As-cast bainite vermicular graphite cast iron cylinder jacket and its preparation method
  • As-cast bainite vermicular graphite cast iron cylinder jacket and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The chemical components are prepared according to the following weight percentages: 3.71% carbon, 1.23% silicon, 0.22% manganese, 0.075% phosphorus, 0.020% sulfur, 0.89% copper, 0.63% molybdenum, 0.15% titanium, and the balance is Fe; use an intermediate frequency induction furnace For smelting ingredients, control the temperature of the molten iron to 1540°C; then transfer the molten iron to a pouring furnace with a temperature of 1520°C; Creeping occurs, and the addition of vermiser and SiFe75 inoculant is 0.9% of the weight of molten iron; pour the vermisified molten iron into a centrifugal casting mold, and adopt the conventional process of centrifugal casting of metal mold wet paint to produce cylinder liners Castings; control the casting temperature at 900°C, then rapidly cool the castings for 1.5 minutes to lower the casting temperature to 500°C; transfer the castings to an incubator for slow cooling for 2 hours; then temper at 520°C for 2.5 hours to obtain a cyli...

Embodiment 2

[0029] The chemical components are prepared according to the following weight percentages: 3.82% carbon, 1.26% silicon, 0.32% manganese, 0.09% phosphorus, 0.025% sulfur, 1.05% copper, 0.99% molybdenum, 0.09% titanium, and the balance is Fe; use a medium frequency induction furnace For smelting ingredients, control the molten iron temperature to 1580°C; then transfer the molten iron to a pouring furnace with a temperature of 1510°C; Creeping occurs, and the addition of vermiser and SiFe75 inoculant is 0.9% of the weight of molten iron; pour the vermisified molten iron into a centrifugal casting mold, and adopt the conventional process of centrifugal casting of metal mold wet paint to produce cylinder liners Castings; control the casting temperature at 850°C, then rapidly cool the castings for 2 minutes to lower the casting temperature to 500°C; transfer the castings to an incubator for slow cooling for 1.5 hours; then hold at 500°C for 2 hours for tempering to obtain the finishe...

Embodiment 3

[0031] The chemical components are prepared according to the following weight percentages: 3.88% carbon, 1.53% silicon, 0.42% manganese, 0.075% phosphorus, 0.022% sulfur, 1.15% copper, 1.15% molybdenum, 0.11% titanium, and the balance is Fe; use an intermediate frequency induction furnace For smelting ingredients, control the temperature of the molten iron to 1560°C; then transfer the molten iron to a pouring furnace with a temperature of 1505°C; Creeping occurs, and the addition of vermiser and SiFe75 inoculant is 0.9% of the weight of molten iron; pour the vermisified molten iron into a centrifugal casting mold, and adopt the conventional process of centrifugal casting of metal mold wet paint to produce cylinder liners Castings; control the casting temperature at 750°C, then rapidly cool the castings for 1.5min to lower the casting temperature to 400°C; transfer the castings to an incubator for slow cooling for 1.5h; then hold at 550°C for 2h for tempering to obtain a cylinde...

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Abstract

The invention provides an as-cast bainite vermicular graphite cast iron cylinder jacket, and the as-cast bainite vermicular graphite cast iron comprises the following chemical components by weight percent: 3.4-3.9% of carbon, 2.2-2.8% of silicon, greater than 0 and smaller than or equal to 0.6% of manganese, greater than 0 and smaller than or equal to 0.4% of phosphorus, greater than 0 and smaller than or equal to 0.03% of sulfur, 0.8-1.2% of copper, 0.5-1.2% of molybdenum, 0.08-0.2% of titanium, 0.04-0.13% of rare earth element, 0.005-0.011% of magnesium, and the balance Fe. With Brinell hardness of 280-340HB and tensile strength over 700MPa, the cylinder jacket of the invention has better wear resistance than traditional cylinder jackets, and is suitable to be used in high-end engines.

Description

technical field [0001] The invention belongs to the technical field of cylinder liners, and in particular relates to a cylinder liner of as-cast bainite vermicular graphite cast iron. Background technique [0002] At present, the cylinder liners used in high-end high-power medium and heavy-duty engines are mostly alloy bainitic gray cast iron cylinder liners, whose strength and wear resistance can meet the working requirements and design life of existing engines; After its tensile strength reaches above 400MPa, it is difficult to improve it. However, with the further increase of engine power and the further increase of explosion pressure, it is difficult for alloy bainite to meet the working requirements and design life of high-end engines in the future. Contents of the invention [0003] The object of the present invention is to provide a cylinder liner of as-cast bainite vermicular graphite cast iron, which has good Brinell hardness, high tensile strength and good wear ...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/08B22D13/04
Inventor 侯起飞邹悟会高广东乔宇鹏
Owner ZYNP GRP
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