Gray pig iron air cylinder sleeve and gas nitriding production process thereof

A production process and gas nitriding technology, applied in metal material coating process, liquid variable capacity machinery, machine/engine, etc., can solve the problems of high cost, low life and low mechanical properties of steel cylinder liners Low cost, short time, wide range of effects

Active Publication Date: 2016-03-02
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the gray cast iron cylinder liners currently produced have low mechanical properties, and the hardness of the working area is lower than that of steel cylinder liners. However, steel cylinder liners have the defects of ...

Method used

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  • Gray pig iron air cylinder sleeve and gas nitriding production process thereof
  • Gray pig iron air cylinder sleeve and gas nitriding production process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A gray cast iron cylinder liner, the chemical composition of the cylinder liner material is as follows in weight percent (%): C: 3.6, Si: 2.8, P: 0.4, S: 0.01, Mn: 0.5, Cu: 0.2,: Ti : 0.04, V: 0.01, the balance is Fe.

[0024] The gas nitriding production process of the above-mentioned gray cast iron cylinder liner comprises the following steps:

[0025] (1) Proportionate batching, smelting with medium frequency coreless induction furnace, controlling the temperature of molten iron out of the furnace to 1485°C, and performing two inoculant treatments on molten iron before being out of the furnace, the first treatment uses 75 ferrosilicon inoculants and adds The amount is 0.5% of the mass of the molten iron, and the second treatment uses a silicon strontium inoculant and the addition amount is 0.2% of the mass of the molten iron, and the cylinder liner casting is prepared by the conventional process of centrifugal casting of metal mold wet paint;

[0026] (2) Nitriding ...

Embodiment 2

[0032] A gray cast iron cylinder liner, the chemical composition of the cylinder liner material is as follows: C: 3.0, Si: 2.0, P: 0.1, S: 0.04, Mn: 1.0, Cu: 0.5, Ti: 0.03, V: 0.03, the balance is Fe.

[0033] The gas nitriding production process of the above-mentioned gray cast iron cylinder liner comprises the following steps:

[0034] (1) Proportionate batching, smelting with intermediate frequency coreless induction furnace, control the temperature of molten iron out of the furnace at 1505°C, and carry out two inoculant treatments on the molten iron before the furnace, the first treatment uses 75 ferrosilicon inoculants and adds The amount is 0.6% of the mass of molten iron, the second treatment uses silicon strontium inoculant and the addition amount is 0.12% of the mass of molten iron, and then the cylinder liner casting is prepared by the conventional process of centrifugal casting of metal mold wet paint;

[0035] (2) Nitriding treatment of cylinder liner castings:

...

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Abstract

The invention discloses a gray pig iron air cylinder sleeve and a gas nitriding production process thereof and belongs to the technical field of air cylinder sleeves. The air cylinder sleeve is composed of, by weight, 3.0%-3.6% of carbon, 2.0%-2.8% of silicon, 0.1%-0.4% of phosphorus, more than 0% but less than 0.12% of sulfur, 0.5%-1.0% of manganese, 0.2%-0.5% of copper, more than 0% but less than 0.06% of titanium, more than 0% but less than 0.04% of vanadium, and the balance iron. The structure of the gray pig iron air cylinder sleeve is flaky graphite (the content of A type graphite is greater than 50%), and the substrate is pearlite (the amount is greater than 95%)+ferrite+a small amount of dispersively distributed carbide and iron phosphide eutectic. The cylinder sleeve is subjected to nitriding treatment, and the air cylinder sleeve with a nitration layer 0.15-0.35 mm thick and the nitration layer 600-800 HV hard is obtained. The nitridation gray pig iron air cylinder sleeve has the advantages of being high in hardness and abrasion resistance, good in anti-abrasion property and the like.

Description

technical field [0001] The invention belongs to the field of cylinder liners, and in particular relates to a gray cast iron cylinder liner and a gas nitriding production process thereof. Background technique [0002] At present, the gray cast iron cylinder liners currently produced have low mechanical properties, and the hardness of the working area is lower than that of steel cylinder liners. However, steel cylinder liners have the defects of high cost, low life, and poor wear-reducing performance. How to make the two materials Combining the advantages of the cylinder liner to obtain better wear-resistant mechanical properties is a technical problem to be solved urgently. Contents of the invention [0003] The object of the present invention is to provide a gray cast iron cylinder liner and its gas nitriding production process. [0004] Based on above-mentioned purpose, the present invention takes following technical scheme: [0005] A gray cast iron cylinder liner, the...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C23C8/26F04B39/12
CPCC22C33/08C22C37/10C23C8/26F04B39/126
Inventor 姜玉领秦小才徐超郭进京
Owner ZYNP GRP
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