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A kind of gray cast iron cylinder liner material and preparation method thereof

A cylinder liner and gray cast iron technology, applied in the field of gray cast iron cylinder liner material and its preparation, can solve the problems of poor corrosion resistance, high cost, poor structural stability, etc.

Active Publication Date: 2021-07-13
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tensile strength of bainite gray cast iron obtained by alloying and heat treatment can reach 400MPa, and the hardness can reach 330HB, but the high cost of bainite materials, poor structural stability, and poor corrosion resistance limit its wide application.

Method used

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  • A kind of gray cast iron cylinder liner material and preparation method thereof
  • A kind of gray cast iron cylinder liner material and preparation method thereof
  • A kind of gray cast iron cylinder liner material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Pig iron, scrap steel, recycled material, iron sulfur powder, ferrosilicon, ferrophosphorus, ferromanganese, ferrochrome, electrolytic copper, ferroniobium, and ferroantimony are batched and melted, and the composition range is adjusted to the design range. The reading spectrometer detects the composition of molten iron, and the detection results are:

[0042] Carbon 3.43wt%, sulfur 0.065wt%, silicon 2.25wt%, phosphorus 0.091wt%, manganese 0.47wt%, chromium 0.42wt%, copper 0.65wt%, niobium 0.32wt%, antimony 0.038wt%, and the balance is iron.

[0043] The smelted molten iron was subjected to centrifugal casting of a metal model to obtain a blank with an outer circle of 136mm, an inner diameter of 107mm and a length of 252mm; the pouring temperature of the centrifugal casting was 1421°C, the pouring speed was 4kg / s, and the rotation speed was 1400 rpm.

[0044] The mold temperature of the obtained blank was 805°C. After exiting the mold, the blank was quickly air-cooled to...

Embodiment 2

[0049] Pig iron, scrap steel, recycled material, iron sulfur powder, ferrosilicon, ferrophosphorus, ferromanganese, ferrochrome, electrolytic copper, ferroniobium, and ferroantimony are melted as raw materials, and the composition range is adjusted to the design range, using photoelectric direct reading The spectrometer detects the composition of molten iron, and the detection results are:

[0050] Carbon 3.25wt%, sulfur 0.072wt%, silicon 2.43wt%, phosphorus 0.078wt%, manganese 0.35wt%, chromium 0.33wt%, copper 0.72wt%, niobium 0.42wt%, antimony 0.025wt%, and the balance is iron.

[0051] The smelted molten iron was subjected to centrifugal casting of a metal model to obtain a blank with an outer circle of 132mm, an inner diameter of 105mm, and a length of 257mm; 1385 rpm.

[0052] The mold temperature of the obtained blank was 792°C. After exiting the mold, the blank was quickly air-cooled to 580°C and then air-cooled to room temperature, and then annealed in a trolley annea...

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Abstract

The invention provides a gray cast iron cylinder liner material, the composition of which is: carbon 3.25-3.5wt%, sulfur 0.06-0.08wt%, silicon 2.0-2.5wt%, phosphorus 0.06-0.1wt%, manganese 0.3-0.5wt%; 0.3-0.5wt% of chromium; 0.6-0.8wt% of copper; 0.35-0.45wt% of niobium; 0.02-0.04wt% of antimony; the balance is iron. In the present invention, the metallographic structure of the prepared gray cast iron cylinder liner material includes flaky graphite, fine flaky pearlite, and about 1% phosphorous eutectic by carrying out alloy elements and process design on the cylinder liner material. At the same time, the metallographic structure Uniform distribution of niobium carbonitrides. The prepared cylinder liner material has high strength, excellent anti-friction matching and corrosion resistance, and at the same time, the material structure is stable and the cost is low.

Description

technical field [0001] The invention relates to the technical field of automobile engine accessories, in particular to a gray cast iron cylinder liner material and a preparation method thereof. Background technique [0002] Cylinder liners are the core components of automobile engines. At present, the materials of cylinder liners are mostly gray cast iron. The gray cast iron cylinder liner material mainly improves its strength and wear resistance through alloy strengthening and heat treatment; the tensile strength of pearlitic gray cast iron is generally below 320MPa, and the hardness is generally less than 280HB. The tensile strength of bainitic gray cast iron obtained by alloying and heat treatment can reach 400MPa, and the hardness can reach 330HB, but the disadvantages of bainitic material, such as high cost, poor structural stability and poor corrosion resistance, limit its wide application. Therefore, developing a gray cast iron cylinder liner material with high stren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/06C21D1/26C21D5/00
CPCC21D1/26C21D5/00C21D2211/006C21D2211/009C22C33/08C22C37/06C22C37/10
Inventor 高广东徐超薛慧敏卢琼秦小才
Owner ZYNP GRP
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