A kind of vanadium-titanium alloy gray cast iron cylinder liner and preparation method thereof

A gray cast iron and cylinder liner technology, applied in the field of vanadium-titanium alloy gray cast iron cylinder liner and its preparation, can solve the problems of low strength and hardness

Active Publication Date: 2021-10-15
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, alloy cylinder liners still have the problem of low strength and hardness in production

Method used

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  • A kind of vanadium-titanium alloy gray cast iron cylinder liner and preparation method thereof
  • A kind of vanadium-titanium alloy gray cast iron cylinder liner and preparation method thereof
  • A kind of vanadium-titanium alloy gray cast iron cylinder liner and preparation method thereof

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Effect test

preparation example Construction

[0092] The present invention also provides a method for preparing an alloy gray cast iron cylinder liner, comprising the following steps:

[0093] 1) After the raw materials are smelted in an intermediate frequency induction furnace, they are then transferred to the holding furnace through a transfer bag, and after being kept for heat preservation, the molten iron after being released from the furnace is obtained;

[0094] 2) After the molten iron obtained in the above steps is fully automatic multi-station casting, it is demoulded to obtain the alloy gray cast iron cylinder liner.

[0095] The present invention is to the parameters, microstructure and composition of the alloy gray cast iron cylinder liner in the above-mentioned preparation method, and the corresponding optimization principle, and the parameters, microstructure and composition corresponding to the aforementioned alloy gray cast iron cylinder liner, and the corresponding optimization principle. Correspondingly,...

Embodiment 1

[0134] The preparation method of vanadium-titanium sheath comprises the following steps:

[0135] Molten iron smelting: pig iron, scrap steel and returned materials, the ratio of pig iron, scrap steel and returned materials is 1.5:6.5:2, smelting in an electric furnace, adding alloys (silicon-manganese alloy, ferrophosphorus, ferro-vanadium, ferro-titanium, ferrochromium, iron sulfur and other ferroalloys and electrolytic copper, etc.), the temperature continues to rise to 1508 ° C until the furnace charge is completely dissolved, the furnace cover is covered and kept for 18 minutes, and fine-tuning is carried out to make its composition control see Table 3.

[0136] table 3

[0137] item C S Si P mn Cr Cu V+Ti Require 3.22 0.065 1.82 0.38 1.05 0.35 0.15 0.32

[0138] The smelted molten iron is treated with slag removal to ensure that there is no iron slag and other inclusions in the molten iron. The molten iron is transferred to the hol...

Embodiment 2

[0151] The preparation method of above-mentioned vanadium-titanium sleeve comprises the following steps:

[0152] Molten iron smelting: use pig iron, scrap steel and returned materials, the ratio of pig iron, scrap steel and returned materials can be controlled according to the cost, such as controlled at 2.5:5.5:2, smelting in an electric furnace, adding alloys (silicon-manganese alloy, Ferrophosphorus, ferrovanadium, ferrotitanium, ferrochromium, ferrosulfur and other ferroalloys and electrolytic copper, etc.), the temperature continues to rise to 1532 ° C, cover the furnace cover and let it stand for 21 minutes to keep warm for 21 minutes, and fine-tune the ingredients. See Table 5 for its composition.

[0153] table 5

[0154] item C S Si P mn Cr Cu V+Ti Require 3.34 0.084 1.88 0.41 0.72 0.35 0.17 0.36

[0155] The smelted molten iron is treated with slag removal to ensure that there is no iron slag and other inclusions in the molten...

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Abstract

The present invention provides an alloy gray cast iron cylinder liner, the alloy gray cast iron cylinder liner contains vanadium and titanium elements; the metallographic structure of the alloy gray cast iron cylinder liner includes graphite and vanadium-titanium phases; The matrix structure of the alloy gray cast iron includes pearlite; the amount of the pearlite is greater than 98%; and the proportion of the fine plate pearlite in the pearlite is greater than or equal to 98%. The alloy gray cast iron cylinder liner provided by the invention has a high proportion of fine pearlite, uniform vanadium-titanium phase structure distribution and a large number. The matrix structure of the vanadium-titanium alloy gray cast iron cylinder liner has a large proportion of pearlite, especially thin flake pearlite. The proportion of the body can reach 100%, and the distribution of the vanadium-titanium phase structure is more uniform, the quantity is large, the impurity content is low, it has the characteristics of high strength and good wear resistance, and at the same time, the process automation is high, the process is compact and more stable, and the product quality is stable. , which greatly reduces labor costs and production costs, and is more suitable for industrial promotion and use.

Description

technical field [0001] The invention belongs to the technical field of manufacturing an alloy gray cast iron cylinder liner, and relates to an alloy gray cast iron cylinder liner and a preparation method thereof, in particular to a vanadium-titanium alloy gray cast iron cylinder liner and a preparation method thereof. Background technique [0002] The automobile engine is the heart part of the automobile. It is composed of two major mechanisms, the crank connecting rod mechanism and the gas distribution mechanism, and five major systems such as cooling, lubrication, ignition, fuel supply, and starting system. The working chamber of an automobile engine is called a cylinder, and the inner surface of the cylinder is cylindrical. The piston reciprocating in the cylinder is hinged to one end of the connecting rod through the piston pin, and the other end of the connecting rod is connected to the crankshaft. The crankshaft is supported by the bearing on the cylinder block and can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/08C21C1/08
CPCC21C1/08C22C33/08C22C37/06C22C37/10Y02P10/20
Inventor 高广东姜玉领郭进京孙世贵徐艳玲李文超
Owner ZYNP GRP
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