Nitralloy cast iron air cylinder sleeve and preparing method thereof

A technology of nitrided alloy and cylinder liner, applied in the field of cylinder liner, can solve the problems of large dimensional change of cylinder liner, low mechanical performance, poor wear resistance and wear reduction, and achieves good cutting performance, dimensional stability and strength performance. high effect

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

AI Technical Summary

Problems solved by technology

[0002] At present, the gray cast iron cylinder liners produced have low mechanical properties, generally in the range of HT200 and HT250. To obtain high-performance cast iron, a large amount of alloying elements need to be added. Poor abrasiveness, which cannot meet the requirements of high-power machines for cylinder liner processing cost, dimensional stability, wear reduction and wear resistance

Method used

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  • Nitralloy cast iron air cylinder sleeve and preparing method thereof
  • Nitralloy cast iron air cylinder sleeve and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to the weight percentage of each component, it is C3.36%, Si2.35%, P0.1%, S0.076%, Mn0.75%, Cu0.425%, Ti0.036%, V0.016%, N0. 0096%, the balance is to prepare raw materials for iron. The molten iron is smelted with an intermediate frequency induction coreless electric furnace. The temperature of the molten iron is 1502 ° C. Before the molten iron is released, 0.6% of the weight of the molten iron is added to the silicon barium inoculant for inoculation; The strontium inoculant is used for secondary inoculation, and the cylinder liner is prepared by the metal mold wet paint centrifugal casting process. The cylinder liner prepared by the metal type wet paint centrifugal casting process is naturally cooled to room temperature after being released from the mold, and then put into the casting frame.

[0014] The tensile strength of the cylinder liner prepared in the present embodiment is 325Mpa, and the modulus of elasticity is 118GPa; the metallographic diagram of...

Embodiment 2

[0016] According to the weight percentage of each component, it is C3.0%, Si2.2%, P0.4%, S0.065%, Mn0.5%, Cu0.2%, Ti0.032%, V0.012%, N0. 006%, and the balance is to prepare raw materials for iron. Melt iron is obtained by smelting with an intermediate frequency induction coreless electric furnace. The temperature of the molten iron is 1480 ° C. Before the molten iron is released, 0.55% of the weight of the molten iron is added to the silicon-barium-calcium inoculant for inoculation; The silicon strontium inoculant is used for secondary inoculation, and the cylinder liner is prepared by centrifugal casting process of metal mold wet paint. The cylinder liner prepared by the metal type wet paint centrifugal casting process is naturally cooled to room temperature after being released from the mold, and then put into the casting frame.

[0017] The cylinder liner prepared in this example has a tensile strength of 338Mpa and a modulus of elasticity of 112GPa.

Embodiment 3

[0019] According to the weight percentage of each component, it is C3.6%, Si2.8%, P0.3%, S0.11%, Mn1.0%, Cu0.5%, Ti0.05%, V0.03%, N0. 0.15%, and the balance is to prepare raw materials for iron. The molten iron is smelted with an intermediate frequency induction coreless electric furnace. The temperature of the molten iron is 1520°C. Before the molten iron is released, 0.65% of the weight of the molten iron is added with a silicon strontium inoculant for inoculation; The strontium inoculant is used for secondary inoculation, and the cylinder liner is prepared by the metal mold wet paint centrifugal casting process. The cylinder liner prepared by the metal type wet paint centrifugal casting process is naturally cooled to room temperature after being released from the mold, and then put into the casting frame.

[0020] The cylinder liner prepared in this example has a tensile strength of 335Mpa and a modulus of elasticity of 116GPa.

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Abstract

The invention belongs to a nitralloy cast iron air cylinder sleeve produced through centrifugal casting and a preparing method thereof. The air cylinder sleeve is prepared from, by weight, 3.0%-3.6% of C, 2.2%-2.8% of Si, 0.1%-0.4% of P, 0.12% or less of S, 0.5%-1.0% of Mn, 0.2%-0.5% of Cu, 0.06% or less of Ti, 0.04% or less of V, 0.006%-0.015% of N and the balance Fe. According to the air cylinder sleeve prepared through the method, the metallographic structure is composed of flake graphite, pearlite (the amount is larger than 95%), a small amount of ferrite and a small amount of dispersely-distributed carbide; the tensile strength is larger than 300 Mpa, and the elasticity modulus is larger than 100 GPa; compared with an ordinary gray cast iron air cylinder sleeve, the dimension is more stable, and the strength performance is higher; the nitralloy cast iron air cylinder sleeve has the advantages of being good in abrasion resistance, wear resistance, wear reduction performance and cutting performance and the like.

Description

technical field [0001] The invention belongs to the technical field of cylinder liners, and in particular relates to a nitrided alloy cast iron cylinder liner and a preparation method thereof. Background technique [0002] At present, the gray cast iron cylinder liners produced have low mechanical properties, generally at HT200 and HT250. In order to obtain high-performance cast iron, a large amount of alloying elements need to be added. The abrasiveness is poor, and it cannot meet the requirements of high-power machines for cylinder liner processing cost, dimensional stability, wear reduction and wear resistance. Contents of the invention [0003] The object of the present invention is to provide a nitrided alloy cast iron cylinder liner with good machinability, dimensional stability, wear resistance and wear reduction and a preparation method thereof. [0004] In order to achieve the purpose of the above invention, the technical solution adopted by the present invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C22C37/10
CPCC22C33/08C22C37/10
Inventor 郭进京高广东姜玉领王勇
Owner ZYNP GRP
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