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A kind of phosphorus niobium cast iron cylinder liner and preparation method thereof

A cylinder liner and cast iron technology, applied in the field of cylinder liners, can solve the problems that cylinder liners cannot meet the requirements of high speed and high power, high explosion pressure and low emission, high performance and long life internal combustion engine, and high production cost, and achieve high cost performance, low production cost, and durability The effect of improving abrasiveness

Active Publication Date: 2016-08-24
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, cylinder liners are mostly made of alloy gray cast iron, such as phosphorus alloy cast iron, boron alloy cast iron, vanadium-titanium alloy cast iron, copper-molybdenum-nickel alloy cast iron, etc. Their matrix structure is mainly pearlite, and the tensile strength of the material is Generally 200-300MPa, hardness 220-260HB; this type of cylinder liner cannot meet the requirements of high-speed, high-power, high-explosion pressure, low-emission, high-performance and long-life internal combustion engines
[0003] Cast bainite gray cast iron cylinder liner, adding nickel and molybdenum alloy, its matrix structure is cast bainite, after heat treatment, the tensile strength is greater than 370MPa, and the hardness is 270-310HB; but the production cost of this type of cylinder liner material high

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  • A kind of phosphorus niobium cast iron cylinder liner and preparation method thereof
  • A kind of phosphorus niobium cast iron cylinder liner and preparation method thereof

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Embodiment 1

[0024] A kind of phosphorus niobium cast iron cylinder liner, the chemical composition of described cylinder liner material is calculated by weight percentage as follows:

[0025] element C Si mn S P Nb Ce iron Weight percentage (%) 2.95 2.02 2.09 0.035 0.241 0.27 0.018 margin

[0026] The preparation method of above-mentioned phosphorus niobium cast iron cylinder liner, it comprises the steps:

[0027] ①Batching is carried out according to the proportion, and the molten iron is obtained by smelting the ingredients with a frequency conversion induction furnace, and the temperature of the molten iron is controlled to be 1503°C;

[0028] ②Add silicon barium calcium inoculant with 0.6% weight of molten iron before it is released from the furnace;

[0029] ③Cylinder liner castings are produced by the conventional process of centrifugal casting with metal mold wet paint. After the casting is out of the mold, let it cool down to room temper...

Embodiment 2

[0032] A kind of phosphorus niobium cast iron cylinder liner, the chemical composition of described cylinder liner material is calculated by weight percentage as follows:

[0033] element C Si mn S P Nb Ce iron Weight percentage (%) 3.01 2.09 2.05 0.043 0.283 0.25 0.012 margin

[0034] The preparation method of above-mentioned phosphorus niobium cast iron cylinder liner, it comprises the steps:

[0035] ①Batching is carried out according to the proportion, and the molten iron is obtained by smelting the ingredients in a frequency conversion induction furnace, and the temperature of the molten iron is controlled at 1498°C;

[0036] ② Add silicon strontium inoculant with 0.55% weight of molten iron before the furnace;

[0037] ③Cylinder liner castings are produced by the conventional process of centrifugal casting with metal mold wet paint. After the casting is out of the mold, let it cool down to room temperature naturally, and then pu...

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Abstract

The invention relates to a phosphorus-niobium cast iron cylinder liner. The chemical composition of the cylinder liner material is calculated according to the following weight percentage: carbon: 2.8-3.1%, silicon: 1.8-2.2%, manganese: 2.0-2.3%, 0<sulfur≤ 0.12%, phosphorus 0.2-0.4%, niobium 0.2-0.3%, cerium: 0.01-0.02%, and the balance is Fe. The graphite shape of the cylinder liner of the present invention is mainly A type, a small amount of D+E type, the matrix is ​​pearlite, and the free ferrite is less than 3%. The working surface hardness of the cylinder liner is 270-320HB, and the tensile strength σb is 350-400MPa. It is suitable for use in contemporary high-speed, high-strength, high-performance, low-emission, and long-life internal combustion engines, and the material production cost is low.

Description

technical field [0001] The invention belongs to the technical field of cylinder liners, and in particular relates to a phosphorus-niobium cast iron cylinder liner and a preparation method thereof. Background technique [0002] At present, cylinder liners are mostly made of alloy gray cast iron, such as phosphorus alloy cast iron, boron alloy cast iron, vanadium-titanium alloy cast iron, copper-molybdenum-nickel alloy cast iron, etc. Their matrix structure is mainly pearlite, and the tensile strength of the material is Generally 200-300MPa, hardness 220-260HB; this type of cylinder liner cannot meet the requirements of high-speed, high-power, high-explosion pressure, low-emission, high-performance and long-life internal combustion engines. [0003] Cast bainite gray cast iron cylinder liner, adding nickel and molybdenum alloy, its matrix structure is cast bainite, after heat treatment, the tensile strength is greater than 370MPa, and the hardness is 270-310HB; but the product...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08C21C1/08
Inventor 孙世贵徐超张亮亮姜玉领
Owner ZYNP GRP